What Is Structural Drying?
Structural drying is the process of removing excess moisture from building materials after a water loss.
Those materials can include:
- Drywall
- Wood framing
- Subfloors
- Concrete
- Flooring
- Cabinets
- Structural wood
- Ceilings
- Other porous and semi-porous building materials
After standing water has been extracted, substantial moisture can remain inside these materials.
A floor may look dry while the subfloor underneath remains wet.
A wall may feel dry while the lower portion of the drywall or wood framing still contains elevated moisture.
That is why removing visible water is only the beginning of many water-damage projects.
Extraction removes the bulk water. Structural drying removes the moisture that remains.
Why Doesn't Water Extraction Completely Dry a House?
Because extraction primarily removes liquid water that can physically be recovered.
Building materials absorb moisture.
Imagine placing the edge of a dry paper towel into a small puddle.
The water doesn't remain only where the towel touches the puddle. It moves into the material.
Buildings do the same thing, although different materials absorb and transport moisture differently.
Water can enter:
- Drywall paper
- Gypsum
- Wood
- Insulation
- Carpet
- Carpet pad
- Subflooring
- Cabinet materials
- Concrete
- Other porous materials
Extraction equipment can remove accessible liquid water, but it cannot simply vacuum all absorbed moisture out of every building material.
That remaining moisture has to be encouraged to leave the material.
That is the purpose of structural drying.
What Does "Wet Moves to Dry" Mean?
This is one of the easiest ways to understand structural drying.
Moisture naturally tends to move from areas of higher moisture concentration toward areas of lower moisture concentration when conditions allow it.
Professional drying takes advantage of that principle.
If the air surrounding a wet material is humid and already holding substantial moisture, there is less drying potential.
If we create much drier air around that wet material, we create conditions that encourage moisture to leave the material and enter the surrounding air.
So instead of simply waiting for a wet building to dry naturally, professional drying intentionally creates a dry environment around the wet structure.
That is why:
Wet moves to dry.
How Do Dehumidifiers Help Dry a House?
A dehumidifier removes water vapor from the air.
As wet building materials begin releasing moisture, that moisture enters the surrounding air.
Without dehumidification, the air can become increasingly humid.
Eventually, the drying environment becomes much less effective because the surrounding air is already holding substantial moisture.
A professional dehumidifier continually removes that water vapor.
This helps maintain the dry air pocket around the affected materials.
The process can be thought of this way:
Wet building materials release moisture -> moisture enters the air -> dehumidifier removes moisture from the air -> drier air remains available to accept additional moisture from the building materials.
The cycle repeats continuously.
How Do Air Movers Help Dry Water Damage?
Air movers move air across wet surfaces.
A thin layer of humid air naturally develops immediately above a wet surface as moisture evaporates.
If that humid boundary layer remains in place, evaporation becomes less efficient.
Air movement helps replace it with drier air.
Professional air movers are positioned so that moving air travels across the affected surfaces.
This promotes evaporation from materials such as:
- Drywall
- Wood
- Flooring
- Structural framing
- Other accessible wet surfaces
The air mover does not actually remove the moisture from the building.
It helps move moisture from the material into the air.
The dehumidifier then removes that moisture from the air.
That is why the two pieces of equipment work together.
Why Are Air Movers and Dehumidifiers Used Together?
Because each performs a different part of the drying process.
Air movers promote evaporation.
Dehumidifiers remove the resulting water vapor from the air.
If you only move air across wet materials without adequately controlling humidity, you can transfer moisture from the materials into the indoor air without efficiently removing it from the drying environment.
If you only dehumidify the room without adequate air movement across wet surfaces, moisture may leave some materials much more slowly.
Professional drying combines the two.
Think of it as a continuous moisture-removal system:
Dry air moves across wet material -> moisture evaporates -> moisture enters the air -> dehumidifier removes the moisture -> dry air returns to the drying environment -> the process repeats.
Why Isn't a Household Fan Enough After Water Damage?
A household fan can move air, but structural drying requires more than air movement.
A professional drying system must manage the relationship between:
- Wet materials
- Air movement
- Humidity
- Temperature
- Dehumidification
- Evaporation
- Drying progress
Putting several household fans in a wet room may make the room feel like it is drying.
That does not tell you:
- Whether moisture remains inside the wall
- Whether the subfloor is wet
- Whether water traveled beneath cabinets
- Whether indoor humidity is being adequately controlled
- Whether concealed materials are drying
- Whether the structure has actually reached an acceptable drying condition
Moving air is part of structural drying. It is not the entire process.
Why Do Professional Dehumidifiers Produce Warm Air?
Dehumidification commonly adds heat to the drying environment as the equipment operates.
Homeowners sometimes become concerned when the affected area feels warmer than normal.
In many drying situations, that warmer environment is expected.
Temperature affects evaporation and the ability of air to hold moisture.
Appropriate warmth can help support the drying process.
However, professional drying is not simply about making the building as hot as possible.
Temperature, humidity and material conditions have to be considered together.
The objective is to create effective drying conditions, not simply a hot room.
Why Does the House Feel Hot During Structural Drying?
Because several pieces of restoration equipment may be operating continuously in a relatively controlled area.
Dehumidifiers generate heat.
Air movers generate some heat.
The HVAC system may also be managed differently depending upon the drying plan.
As a result, the drying area may feel warmer than the rest of the home.
That does not necessarily mean something is wrong.
The restoration company should be monitoring the environmental conditions to determine whether the drying system is operating appropriately.
Should I Open the Windows While the Dehumidifiers Are Running?
Usually not unless the restoration professional specifically instructs you to do so.
A structural drying environment is generally intended to be controlled.
Opening doors or windows can introduce outside air into that environment. In Southwest Florida, that outside air frequently contains substantial moisture.
If dehumidifiers are being used to create and maintain a dry air pocket, leaving windows open can make the equipment work against a continuous supply of humid outdoor air rather than concentrating its capacity on moisture coming from the wet structure.
There is an important exception when heat is intentionally being used as part of the drying strategy.
A restoration professional may use the building's HVAC system to increase the temperature and promote evaporation. Under those controlled conditions, windows may be opened strategically to allow the resulting warm, moisture-laden air to escape the building rather than trapping that moisture inside.
That is a deliberate drying technique, not simply opening the house for ventilation.
Whether the building should remain closed or be ventilated therefore depends upon the drying method being used and the indoor and outdoor conditions.
Homeowners should not open or close windows, change the HVAC settings, or otherwise alter the established drying environment without first talking to the restoration contractor.
Should I Turn Off the Air Movers at Night?
No, not unless the restoration company instructs you to do so.
Professional drying equipment is generally intended to operate continuously during the active drying process.
Turning equipment off for several hours every night interrupts the drying environment.
The dry air pocket can change.
Humidity can increase.
Evaporation can slow.
Repeatedly shutting down air movers can increase the total drying time significantly. Depending on the materials, moisture conditions and length of the interruptions, drying can take two to four times longer – or potentially more – than it would under properly maintained continuous drying conditions.
This is because the drying process does not simply pick up exactly where it left off every morning. The controlled conditions created by the equipment can deteriorate while the system is shut down, and time is then required to re-establish effective drying conditions.
Air movers can certainly be noisy.
But if the equipment has been properly installed for continuous operation, repeatedly turning it off can work directly against the drying process and substantially extend the amount of time the structure remains wet.
If noise, heat or equipment placement is causing a significant problem, contact the restoration company rather than simply unplugging equipment.
Should I Turn Off the Dehumidifier at Night?
Generally, no.
The dehumidifier is one of the most important components maintaining the controlled drying environment.
Even when air movers are promoting evaporation, the moisture entering the air still has to be removed.
Turning off the dehumidifier allows humidity to rise as wet materials continue releasing moisture.
Unless instructed otherwise by the restoration contractor:
Let the drying equipment run.
Can I Move the Drying Equipment Myself?
It is better not to.
Air movers are normally placed deliberately to direct airflow across specific wet materials.
Dehumidifiers are positioned based on the drying chamber and equipment setup.
Moving equipment because it is inconvenient can unintentionally reduce airflow to an area that still needs it.
If a machine blocks a doorway, interferes with normal use of the home or creates another problem, call the restoration company.
The equipment can often be repositioned without compromising the drying plan.
Why Does the Restoration Company Keep Moving the Air Movers?
Because the structure is changing as it dries.
The wettest materials on the first day may not be the wettest materials on the second or third day.
Some areas may reach their drying goals before others.
As materials dry, the restoration technician can:
- Move air movers
- Redirect airflow
- Remove equipment that is no longer necessary
- Concentrate equipment on slower-drying areas
- Modify the drying chamber
A good drying setup should not necessarily look identical from beginning to end.
The drying system should respond to what the moisture readings show.
How Does a Restoration Company Know Where to Put Air Movers?
Air movers are generally positioned to create effective airflow across affected surfaces.
The exact placement depends upon:
- The amount of affected material
- Room configuration
- Type of material
- Water migration
- Demolition performed
- Drying method
- Accessibility
- Equipment specifications
- Moisture readings
The goal is not to fill every available square foot with equipment.
It is to create the airflow necessary to support efficient evaporation from the materials that actually need to dry.
Can You Use Too Many Air Movers?
More equipment does not automatically mean better drying.
Air movement has to work with the dehumidification capacity and the actual drying conditions.
If large amounts of moisture are being evaporated into the air, the drying system needs sufficient dehumidification to remove that moisture.
Professional equipment calculations are designed to create a balanced drying system.
The objective is not:
More machines.
The objective is:
The right drying conditions.
How Many Dehumidifiers Does It Take to Dry a House?
There is no single number.
As a practical rule used in our structural-drying setups, one professional dehumidifier processes approximately 900 cubic feet of drying space, although the actual equipment requirements still have to be adjusted for the conditions of the individual water loss.
That means calculating dehumidification is not simply a matter of counting how many rooms are wet. The cubic volume of the affected drying area matters.
For example, a room that is 10 feet wide, 12 feet long and has an 8-foot ceiling contains:
10 x 12 x 8 = 960 cubic feet
That gives the restoration professional a starting point for understanding the volume of air being processed.
But cubic footage alone does not determine the final equipment requirement.
Factors can include:
- Amount of affected material
- Water class
- Cubic volume of the drying area
- Type of building materials
- Amount of moisture being evaporated
- Temperature
- Humidity
- Equipment capacity
- Drying chamber configuration
- Progress of the drying process
The initial equipment calculation establishes the drying system. Moisture readings and psychrometric conditions then tell us whether that system is actually working.
One project may require a single dehumidifier while a larger or more heavily affected structure may require several.
As drying progresses, equipment can also be adjusted based upon actual conditions.
The number of rooms alone does not determine how many dehumidifiers are needed. The volume of the drying environment, amount of moisture and actual performance of the drying system do.
What Is a Drying Chamber?
A drying chamber is an area in which environmental conditions are controlled to concentrate drying efforts on affected materials.
Sometimes the affected rooms themselves form the drying chamber.
In other situations, temporary containment may be used to reduce the volume of air the drying equipment has to manage.
For example, if only a portion of a very large building is wet, controlling a smaller affected area may allow the drying equipment to work more efficiently.
The goal is to create and maintain favorable conditions around the wet materials.
Does the Air Conditioner Help With Structural Drying?
It can.
Air-conditioning systems remove some moisture from indoor air while cooling the building.
However, a residential HVAC system is not a replacement for professional dehumidification when substantial structural drying is necessary.
Restoration professionals may use the building's HVAC system as part of the overall drying strategy when appropriate.
In other situations, the HVAC system may need to be isolated or managed differently.
It depends on:
- The water loss
- Contamination concerns
- Outdoor conditions
- Indoor conditions
- HVAC configuration
- Drying strategy
The restoration contractor should determine how the HVAC system fits into the drying plan.
What Is Relative Humidity During Structural Drying?
Relative humidity describes the amount of moisture in the air relative to how much moisture that air can hold at a particular temperature.
Homeowners commonly recognize it simply as humidity.
During structural drying, humidity matters because the surrounding air needs enough drying potential to continue accepting moisture from wet materials.
If the air becomes too humid, drying becomes less efficient.
Dehumidification helps maintain conditions that encourage moisture to continue leaving the structure.
What Are Psychrometric Readings?
Psychrometry is the science of the relationship between air, temperature and moisture.
Restoration professionals use environmental measurements to understand whether the drying environment is functioning properly.
These measurements commonly include:
- Temperature
- Relative humidity
Additional calculations can help technicians evaluate how much moisture is actually present in the air and how conditions are changing.
The terminology can sound complicated.
The homeowner does not need to become a psychrometrician.
The practical purpose is straightforward:
We measure the air so we know whether we are creating conditions that will dry the building.
What Is Grain Depression?
Restoration professionals may compare the moisture content of air entering a dehumidifier with the moisture content of the air leaving it.
This helps evaluate whether the dehumidifier is removing moisture.
Homeowners may hear technicians discuss measurements such as grains per pound or grain depression.
You do not need to understand the calculation to understand its purpose.
It is another way of determining whether the drying equipment is actually doing what it is supposed to do.
How Do You Know If Drywall Is Actually Dry?
You measure it.
Appearance is not enough.
Touch is not enough.
A wall can look completely normal while still containing elevated moisture.
Restoration professionals use moisture-detection equipment to evaluate affected materials and compare their condition as drying progresses.
Depending upon the material and circumstances, readings may be compared with:
- Earlier readings from the same material
- Unaffected areas
- Appropriate dry standards or drying goals
But the drywall reading is only part of the picture.
The seal plate at the bottom of the wall is one of the most important readings because it helps tell us what may still be happening inside the wall assembly.
A section of drywall may already read dry while the wood framing behind it – especially the bottom plate – still contains elevated moisture.
That is why the restoration technician should not simply meter the face of the drywall, see a dry reading and assume the entire wall assembly is finished.
Dry drywall does not necessarily mean dry framing.
What Is a Moisture Meter?
A moisture meter is an instrument used to evaluate moisture conditions in building materials.
Different types of meters work differently.
Some use pins that penetrate the material.
Others are non-invasive and evaluate moisture conditions without penetrating the surface.
A restoration professional may use more than one type depending upon the material and the information needed.
Moisture meters help:
- Find affected areas
- Establish the extent of water migration
- Monitor drying progress
- Identify slower-drying materials
- Determine when drying goals have been reached
They are fundamental tools in professional water-damage restoration.
Can a Moisture Meter Tell Exactly How Much Water Is in a Wall?
A moisture meter can tell us how wet the material being measured is, but one drywall reading does not necessarily tell us the condition of the entire wall assembly.
For example, the drywall itself may have already dried while the wood framing behind it remains wet.
This is why the seal plate – or bottom plate – reading is so important.
The bottom plate is the horizontal framing member at the base of the wall. Water that enters a wall assembly can collect around or be absorbed into this framing even after the drywall surface begins showing much lower moisture readings.
A professional restoration technician therefore looks at more than the drywall face.
Depending upon the wall construction and conditions, the technician may evaluate:
- The drywall
- The base of the wall
- The seal or bottom plate
- Accessible studs
- Other structural materials within the affected assembly
The drywall reading tells us how wet the drywall is. The seal-plate reading can help tell us whether the structure behind the drywall is actually dry.
If the drywall reads dry but the seal plate is still elevated, the wall is not finished drying simply because the visible drywall has reached its goal.
The studs and other framing behind that drywall may still contain moisture.
That is why the important question isn't only:
"Is the drywall dry?"
It is:
"Is the wall assembly dry?"
The technician has to understand:
- The meter
- The material being measured
- The wall construction
- The location of the reading
- What materials may be concealed behind the surface
- The limitations of the measurement
The important part is not simply owning a moisture meter.
It is knowing where to take the readings and how to interpret what those readings tell you about the entire structure.
Does Thermal Imaging Prove That a Wall Is Wet?
No.
Thermal imaging detects surface-temperature differences.
Wet areas may produce thermal patterns because evaporation and moisture can affect surface temperature.
That makes thermal imaging extremely useful for quickly identifying areas that deserve closer investigation.
But temperature differences can also result from other conditions.
A thermal image should therefore be used as an investigative tool and confirmed with appropriate moisture-detection methods.
Thermal imaging helps us look. Moisture measurements help us confirm.
How Do You Know If a Concrete Floor Is Dry?
Concrete has to be evaluated differently from drywall or wood.
A surface reading alone does not necessarily tell you what is happening deeper inside the slab.
Concrete is porous and can retain moisture below the surface even when the top appears and feels dry.
In our structural-drying work, 20% or less is the dry-standard target we use for concrete when evaluating the material with the appropriate meter and testing method.
However, the important part is where and how the concrete is tested.
Simply placing a surface meter on the top of the slab may not provide enough information to determine whether the concrete has actually reached its dry standard.
When the condition of the slab needs to be confirmed, the concrete is drilled and tested with appropriate moisture-testing equipment so the internal condition of the slab can be evaluated.
This distinction matters because a slab can:
- Look dry
- Feel dry
- Produce a relatively low surface reading
while still retaining moisture deeper within the concrete.
For structural drying, we therefore do not determine that a concrete floor is dry simply because the surface looks good.
The concrete should be tested appropriately, and the reading should be at or below the established dry standard – in our drying work, approximately 20% or less on the applicable meter scale – before the slab is considered dry.
This becomes especially important before:
- Installing new flooring
- Applying adhesives
- Installing moisture-sensitive finishes
- Closing out a structural-drying project involving a wet slab
The principle is the same one we use with walls:
Do not assume the material is dry because the surface is dry. Test the part of the structure that actually matters.
Can Concrete Stay Wet After Water Damage?
Yes.
Concrete behaves differently from materials such as drywall and wood.
It is porous and can hold substantial moisture.
Moisture can also move through concrete over time.
This becomes especially important when flooring will later be installed over the slab.
A surface that appears dry does not necessarily mean the slab has reached conditions appropriate for every type of floor covering.
When the internal condition of the concrete needs to be established, the slab should be drilled and tested with the appropriate moisture-testing equipment.
For the testing approach used in our structural-drying work, we are looking for a concrete dry-standard reading of approximately 20% or less on the applicable meter scale.
That gives us a much better indication of the slab's condition than simply touching the surface or relying on appearance.
What Are Drying Goals?
Drying goals are the conditions used to determine when affected materials have been adequately dried.
A restoration contractor should not simply decide in advance:
"This job gets three days of equipment."
Different materials dry at different rates.
Different buildings dry differently.
Different water losses create different conditions.
Drying goals may be established using appropriate comparisons with similar unaffected materials and other accepted restoration practices.
Different materials also require different measurement techniques.
For example:
- Drywall can be evaluated with appropriate moisture-meter readings.
- Wood framing may require direct evaluation of studs and bottom plates.
- Concrete may require drilling and internal testing to verify that it has reached its dry-standard target.
The important concept is:
Drying ends because the material reached its drying goal – not because the equipment rental reached a certain number of days.
How Long Does Structural Drying Take?
There is no universal drying time for every water loss.
In practical structural drying, three days is a common initial drying period, and many structures require at least several days of continuous mechanical drying before affected building materials reach appropriate drying goals.
Some projects can progress faster.
Others can take considerably longer.
Drying time depends upon:
- How much water entered the building
- How long the materials were wet before mitigation began
- Type of building materials
- Amount of saturation
- Water category
- Water class
- Temperature
- Humidity
- Accessibility
- Whether wet materials are concealed
- Whether demolition is necessary
- Equipment capacity
- How the materials respond to drying
The important point is that three days should not be treated as an automatic equipment-removal date.
If the structure is still wet after three days, the drying process continues.
If measurements show that affected materials have reached their drying goals, equipment can be reduced or removed as appropriate.
The correct question is not simply:
"Has the equipment been here for three days?"
It is:
"Have the affected materials reached their documented drying goals?"
Professional structural drying follows the condition of the structure rather than an arbitrary calendar date.
Does Water Damage Always Dry in Three Days?
No.
Three days is a common initial structural-drying period, but it is not a guarantee that every water-damaged structure will be dry at the end of Day 3.
Some materials may reach their drying goals within that period.
Others may require additional days of continuous mechanical drying.
Factors such as saturation, material type, concealed moisture, wall construction, flooring systems, environmental conditions and how quickly mitigation began all affect the drying time.
This is why moisture measurements remain essential.
A restoration company should not remove equipment simply because three days have passed if the structure still contains elevated moisture.
Likewise, the number of days equipment has been installed should never substitute for actually measuring the materials.
Three days may be a common initial drying period. The measurements determine when the structure is actually dry.
Why Is Daily Monitoring Important?
Because the drying system should respond to changing conditions.
Monitoring allows the restoration professional to determine:
- Whether materials are drying
- Whether humidity is decreasing
- Whether dehumidifiers are performing
- Whether equipment needs to be moved
- Whether additional drying access is necessary
- Whether equipment can be reduced
- Whether a material is not responding as expected
- Whether drying goals have been achieved
Without monitoring, equipment could sit in a building for several days without anyone knowing whether the drying strategy is actually working.
Professional drying is a process, not an equipment rental.
What Happens If a Material Isn't Drying?
If moisture readings show that a material is not responding as expected, the restoration contractor needs to determine why.
Possible reasons can include:
- Insufficient airflow
- Inadequate dehumidification
- Concealed moisture
- Trapped insulation
- Multiple layers of material
- Vapor barriers
- Water beneath flooring
- Water inside wall cavities
- Limited access
- Material characteristics
The drying strategy may then need to be modified.
That could involve:
- Repositioning equipment
- Creating additional drying access
- Changing the drying chamber
- Using specialized drying equipment
- Removing a material that cannot reasonably be dried in place
This is another reason monitoring matters.
If you don't measure the material, you don't know whether the strategy is working.
Can Walls Be Dried Without Removing the Drywall?
Often, yes.
Wet drywall does not automatically require removal.
Whether drywall can be dried in place depends upon:
- Water category
- Material condition
- Amount of saturation
- Duration
- Wall construction
- Insulation
- Coatings
- Accessibility
- Evidence of microbial growth
- Ability to establish effective drying
Sometimes removing baseboard and creating limited drying access is sufficient.
Sometimes specialized wall-cavity drying methods can be used.
Other times drywall removal is necessary.
Professional mitigation should determine which approach is appropriate based on the actual condition of the wall, rather than automatically removing every wet material.
Can Wood Framing Be Dried After Water Damage?
Yes, in many circumstances.
Structural lumber is commonly dried after water losses.
Wood can absorb significant moisture, but with appropriate conditions and sufficient time it can often be returned to an acceptable moisture condition.
The restoration contractor monitors the wood as drying progresses.
The important issue is not whether the framing became wet.
It is whether:
- Contamination can be appropriately addressed
- The material remains structurally sound
- Effective drying can be established
- Appropriate drying goals can be reached
Wet framing does not automatically mean damaged framing.
Can Hardwood Floors Be Dried After Water Damage?
Sometimes.
Hardwood flooring can absorb moisture and begin to:
- Cup
- Crown
- Swell
- Separate
- Buckle
But visible distortion does not always mean the floor is immediately unsalvageable.
Depending upon the water source, flooring system, degree of saturation and length of exposure, specialized drying systems may sometimes be used to remove moisture from beneath and within hardwood flooring.
What Is Specialty or Injectidry Drying?
Some water losses require drying methods beyond standard air movers and dehumidifiers.
Specialized systems can be used to direct airflow into or through difficult building assemblies.
Depending upon the situation, specialty drying can be used for:
- Wall cavities
- Hardwood flooring systems
- Cabinets
- Built-in assemblies
- Other concealed or difficult-to-access areas
These systems can sometimes reduce the amount of demolition necessary.
But specialized drying is not automatically appropriate for every material or every water loss.
The condition still needs to be evaluated and monitored.
Does Structural Drying Prevent Mold?
Prompt and effective drying can greatly reduce the conditions that support mold growth, because mold requires moisture.
But structural drying should not be described as a guarantee that mold can never occur.
The building may have:
- Pre-existing mold
- Previously wet materials
- Concealed contamination
- Areas outside the drying system
- An ongoing moisture source
The objective after a water loss is to remove unnecessary moisture as quickly and effectively as practical.
The less time building materials remain wet, the less opportunity there is for secondary damage and microbial growth.
How Much Electricity Does Water-Damage Drying Equipment Use?
Professional air movers and dehumidifiers use electricity, and a substantial drying project can increase electrical consumption while the equipment is operating.
The amount depends on:
- Equipment type
- Number of machines
- Equipment amperage
- Length of operation
- Drying duration
The equipment generally runs continuously because maintaining the drying environment is part of the restoration process.
If the water loss is covered by insurance, the additional electricity used by the drying equipment may be recoverable as part of the claim.
A homeowner should keep the electric bill covering the period when the drying equipment was operating and obtain approximately three months of electric bills from before the loss. Those prior bills can help establish the home's normal electrical usage and provide a comparison against the increased usage during structural drying.
For example, if the home's electric bills were consistently around $200 before the loss and the bill covering the drying period increases substantially while professional drying equipment was operating continuously, that documentation can help establish the additional loss-related expense.
The homeowner can submit the documentation to the insurance carrier and request reimbursement of the documented increase as a supplemental claim expense.
The restoration company's equipment records can also help document:
- What equipment was installed
- How many units were operating
- When the equipment was installed
- How long the equipment operated
- When the equipment was removed
Do not throw away the higher electric bill simply because the original water-damage claim has already been paid.
If the increased electrical expense becomes known after the initial claim payment, it may still be submitted to the insurance carrier as a supplemental claim expense, subject to the terms, coverage and claim procedures of the individual policy.
This is another reason good restoration documentation matters.
The drying equipment is being operated because of the water loss, and the resulting increase in electrical usage can be documented rather than simply absorbed by the homeowner.
Can Drying Equipment Trip Breakers?
It can if electrical loads are not properly managed.
Professional restoration equipment can draw significant electrical current, particularly when multiple machines are operating.
A restoration company should consider available electrical circuits when setting equipment.
Equipment should not simply be plugged into random outlets without considering the electrical load.
If a breaker repeatedly trips, contact the restoration company.
Do not repeatedly reset a breaker without determining why it is tripping.
Is Structural Drying Safe to Leave Running When I Am Not Home?
Professional drying equipment is commonly operated continuously in occupied and unoccupied properties.
However, the equipment should be properly installed and the property conditions should be appropriate for unattended operation.
Homeowners should:
- Avoid moving equipment
- Avoid covering air movers or dehumidifiers
- Keep items away from air intakes and exhausts
- Report unusual noises or odors
- Report repeatedly tripping breakers
- Follow instructions from the restoration company
If something appears wrong with a machine, contact the restoration contractor rather than attempting to repair the equipment yourself.
Why Does Experience Matter in Structural Drying?
Structural drying requires more than owning air movers, dehumidifiers and moisture meters.
The equipment is only as effective as the person designing and monitoring the drying system.
ServiceMaster SRQ owner Christopher Whittaker is IICRC Applied Structural Drying (ASD) certified, advanced training specifically focused on the science and practical application of drying water-damaged structures.
That expertise matters when determining:
- What can be dried instead of removed
- How to establish an effective drying environment
- Where and how drying equipment should be placed
- Whether concealed materials are responding
- When the drying strategy needs to be changed
- Whether specialty drying methods are appropriate
- When affected materials have actually reached their drying goals
Structural drying is not simply a matter of calculating how many air movers and dehumidifiers can be placed in a building.
The restoration professional has to understand how moisture is moving through the structure, how different building materials respond, whether the drying environment is working and what the measurements are showing as the project progresses.
The objective isn't to put equipment in a building and wait.
The objective is to understand how moisture is moving through the structure, control the drying environment, measure the results and continually adjust the drying system until the affected materials are dry.
When Is Structural Drying Finished?
Structural drying is finished when the affected materials have reached appropriate drying goals and the restoration professional determines that the active drying process is complete.
That determination should be based on measurements and documented drying progress.
Not:
- How dry the room feels
- Whether the surface looks dry
- Whether the equipment has simply been there for three days
- Whether the homeowner is tired of hearing the air movers
- Whether the contractor needs the equipment for another job
For walls, that means looking beyond the drywall when necessary.
For concrete, that means using an appropriate testing method and confirming that the slab has reached the established dry-standard target.
In our structural-drying work, approximately 20% or less on the applicable concrete meter scale is the dry-standard target.
The structure tells us when it is dry.
We determine that by measuring it appropriately for the material involved.
What Happens After Structural Drying Is Complete?
Once appropriate drying goals have been reached:
- Final moisture conditions are documented.
- Drying equipment is removed.
- Remaining mitigation work is completed if necessary.
- The property is evaluated for reconstruction.
- Removed materials can then be replaced as part of the repair process.
If little or no demolition was necessary, the home may require minimal repairs.
If substantial materials were removed to properly mitigate the loss, reconstruction may include:
- Drywall
- Texture
- Paint
- Flooring
- Baseboards
- Cabinets
- Carpentry
- Other finishes
Structural drying and reconstruction are different phases.
First get the building dry. Then put it back together.
What Should I Ask My Restoration Company About Structural Drying?
A homeowner can ask:
- What materials are wet?
- How did you determine the affected area?
- What moisture meters are you using?
- What are my initial moisture readings?
- What are you using as the drying goal?
- Why are these air movers positioned here?
- How much dehumidification is being used?
- How often will the structure be monitored?
- Are the materials drying as expected?
- Will equipment be adjusted as the materials dry?
- How will you determine when drying is complete?
- Will you verify that concealed framing such as bottom plates has dried, rather than relying only on drywall readings?
- If my concrete slab was affected, will you drill and test the slab rather than relying only on a surface reading?
- What concrete dry standard are you using?
- Will I receive documentation of the drying process?
A professional restoration contractor should be able to explain the answers.
You do not need to understand every technical measurement.
But you should be able to understand the overall plan:
What is wet, how it is being dried, whether it is getting drier and how the contractor will know when the job is complete.
What Professional Standard Applies to Structural Drying?
Professional water-damage restoration is addressed by the ANSI/IICRC S500 Standard for Professional Water Damage Restoration.
The S500 provides a professional framework addressing subjects such as:
- Water-damage restoration principles
- Building and material science
- Psychrometry
- Drying technology
- Equipment
- Inspections
- Documentation
- Structural restoration
The standard provides a framework, but every water loss still requires professional judgment.
Buildings are different.
Materials are different.
Water losses are different.
That is why professional structural drying combines recognized restoration principles with actual measurements from the individual property.
Structural Drying From Start to Finish
Although every water loss is different, the structural-drying portion of a professional mitigation project generally follows this progression:
- Remove Bulk Water
Extract as much accessible liquid water as practical.
- Identify the Wet Materials
Use moisture-detection equipment and inspection to establish the affected area.
- Evaluate What Can Be Dried
Determine which materials can reasonably remain and which require removal.
- Create Drying Access
Expose wet materials or assemblies where necessary.
- Establish the Dry Air Pocket
Use professional dehumidification to reduce moisture in the drying environment.
- Establish Air Movement
Position air movers to move dry air across affected surfaces and promote evaporation.
- Monitor the Environment
Measure temperature, humidity and other relevant drying conditions.
- Monitor the Materials
Take repeated moisture readings to determine whether affected materials are progressing.
This includes looking beyond surface materials where necessary.
A drywall reading may show that the drywall is dry while the bottom plate or studs behind it still contain elevated moisture.
Concrete requires its own consideration.
When the slab has been affected, it may need to be drilled and tested with appropriate moisture-testing equipment to determine its internal condition. In our structural-drying work, the concrete dry-standard target is approximately 20% or less on the applicable meter scale.
- Adjust the Equipment
Move, reduce or modify equipment as conditions change.
- Address Materials That Are Not Responding
Determine why a material remains wet and modify the drying strategy when necessary.
- Reach the Drying Goals
Continue controlled drying until affected materials – including concealed structural materials and concrete where applicable – reach appropriate drying conditions.
- Document Completion
Record final moisture conditions and remove the drying equipment.
The entire process comes back to one principle:
Create dry air -> move that dry air across wet materials -> allow moisture to leave the materials -> remove that moisture from the air -> continue until the structure reaches its drying goals.
Key Takeaways
- Removing standing water does not necessarily mean the building is dry.
- Building materials can hold substantial moisture after extraction.
- Structural drying removes moisture remaining in the building after bulk water has been removed.
- Wet moves to dry.
- Professional drying creates a dry environment around wet building materials.
- Dehumidifiers remove water vapor from the air and help maintain the dry air pocket.
- Air movers move drier air across wet surfaces and promote evaporation.
- Air movers and dehumidifiers work together as a drying system.
- Household fans alone do not provide professional structural drying.
- Drying equipment commonly operates continuously.
- Repeatedly shutting air movers down can substantially extend drying time, potentially by two to four times or more, depending upon the conditions.
- Homeowners generally should not unplug or reposition equipment without talking to the restoration contractor.
- Windows generally remain closed during controlled dehumidification, but strategic ventilation may be used when HVAC heat is intentionally part of the drying strategy.
- Professional drying equipment may make the affected area warmer.
- Equipment placement should change when moisture conditions change.
- More equipment does not automatically mean better drying.
- Professional dehumidification requirements are based in part on the cubic volume of the drying environment; in our practical setups, each dehumidifier processes approximately 900 cubic feet.
- Moisture meters are used to find wet materials and monitor their progress.
- A dry drywall reading does not necessarily mean the framing behind the drywall is dry.
- Bottom-plate or seal-plate readings can be critical because the studs and plate may remain wet after the drywall itself has dried.
- Concrete can remain wet internally even when the surface appears dry.
- Concrete may need to be drilled and tested to determine its internal moisture condition.
- In our structural-drying work, approximately 20% or less on the applicable concrete meter scale is the concrete dry-standard target.
- Thermal imaging can help locate suspicious areas but does not prove that a material is wet.
- Professional drying should be measured rather than judged by appearance.
- Three days is a common initial structural-drying period, but it is not an automatic completion point.
- Different materials dry at different rates.
- Wet drywall does not automatically require removal.
- Wood framing can often be dried.
- Specialized drying systems can sometimes reduce unnecessary demolition.
- Monitoring allows the restoration company to determine whether the drying strategy is actually working.
- Drying is complete when affected materials reach appropriate drying goals.
- Homeowners may be able to submit documented increases in electrical usage from drying equipment as a supplemental claim expense, depending upon policy coverage and claim handling.
- Structural drying depends on the knowledge and judgment of the professional designing and monitoring the drying system.
- ServiceMaster SRQ owner Christopher Whittaker is IICRC Applied Structural Drying (ASD) certified.
- The ANSI/IICRC S500 provides the recognized professional framework for water-damage restoration.
Frequently Asked Questions
How long does it take to structurally dry a house after water damage?
Structural drying commonly requires at least several days of continuous mechanical drying, with three days often serving as a common initial drying period.
Some losses dry within that timeframe. Others require considerably longer.
The determining factor is the condition of the materials and whether they have reached their documented drying goals.
Do air movers actually remove water?
Air movers promote evaporation by moving dry air across wet surfaces. The moisture enters the air, and dehumidifiers then remove that water vapor from the drying environment.
Why do I need both fans and dehumidifiers after water damage?
They perform different jobs. Air movers encourage moisture to leave wet materials. Dehumidifiers remove that moisture from the surrounding air.
Can I turn the drying equipment off while I sleep?
Generally, no. Professional drying equipment is normally intended to operate continuously unless the restoration company instructs otherwise. Repeated shutdowns can substantially extend the drying process and, depending on conditions, may increase drying time by two to four times or more.
Can I open my windows while the drying equipment is running?
Usually not without talking to the restoration contractor. During controlled dehumidification, opening windows can introduce humid outdoor air and interfere with the drying environment. However, when HVAC heat is intentionally being used to increase evaporation, strategic ventilation may be used to allow warm, moisture-laden air to escape.
How many dehumidifiers do I need after water damage?
There is no single number for every water loss.
The drying contractor considers the cubic volume of the affected drying area, the amount and type of wet material, the water class, environmental conditions and the capacity of the equipment being used.
As a practical guideline in our drying setups, each professional dehumidifier processes approximately 900 cubic feet of drying space. The equipment setup is then monitored and adjusted based on actual drying performance.
Can I get reimbursed for the extra electricity used by drying equipment?
Potentially, depending upon the insurance policy and claim.
Professional drying equipment may operate continuously for several days and can noticeably increase electrical consumption.
Keep the electric bill covering the drying period and obtain approximately three months of prior electric bills to establish your normal usage.
You can submit the documented increase to the insurance carrier and request that it be considered as a supplemental claim expense.
The restoration company's equipment records can also help establish what equipment was operating and for how long.
How do you know whether a concrete floor is dry?
A concrete floor should not be judged only by appearance or a surface reading.
Concrete can retain moisture below the surface even when the top appears completely dry.
Where the slab has been affected, the concrete may need to be drilled and tested with the appropriate moisture-testing equipment to determine the actual condition inside the slab.
In our structural-drying work, approximately 20% or less on the applicable concrete meter scale is the dry-standard target.
That means the goal is not simply:
"The concrete looks dry."
It is:
"The appropriate concrete test confirms that the slab has reached the established dry standard."
Why is my house so hot while the drying equipment is running?
Dehumidifiers and other restoration equipment generate heat during operation. Warmer conditions can be normal during structural drying.
How do you know when drywall is dry?
Moisture measurements are used to evaluate the drywall and compare its condition with appropriate drying goals or unaffected materials.
But the drywall is only one component of the wall assembly. The restoration technician may also need to evaluate the bottom or seal plate and framing behind the drywall to verify that the structure itself has dried.
Can the drywall be dry while the studs behind it are still wet?
Yes.
This is exactly why a restoration technician should not rely on drywall readings alone.
The drywall can reach its drying goal before the structural wood behind it does. The seal or bottom plate may remain wet, and studs within the wall can also retain elevated moisture.
A wall should not be considered completely dry merely because the drywall face reads dry.
Does wet drywall always have to be removed?
No. Depending on the water source, material condition, wall construction and ability to establish effective drying, drywall can sometimes be dried in place.
Can wet wood framing be saved?
Often, yes. Structurally sound framing can frequently be mechanically dried and monitored until appropriate moisture conditions are reached.
Why does the restoration company keep moving the fans?
Because drying conditions change. As some materials dry faster than others, airflow can be redirected toward areas that still require drying.
How often should moisture readings be taken?
The structure should be monitored throughout the active drying process at appropriate intervals so the restoration contractor can evaluate progress and adjust the drying system.
Is three days enough to dry water damage?
Sometimes.
Three days is a common initial structural-drying period, but it should not be treated as a universal finish date.
Some water losses may reach their drying goals in that period. Others require additional days.
A professional restoration contractor should continue monitoring the affected materials and keep the necessary drying equipment in place until appropriate drying goals have been reached.
Does structural drying prevent mold?
Removing excess moisture promptly reduces the conditions that support mold growth, but drying does not guarantee that pre-existing or concealed microbial contamination is absent.
How do I know whether my restoration company actually dried my house?
Ask for the moisture measurements and drying documentation.
The contractor should be able to explain what was wet, how the materials progressed and how it determined that the drying goals were achieved.
For walls, that should mean considering the wall assembly, not merely showing that the exposed drywall now reads dry.
For concrete, that means using an appropriate concrete-testing method and confirming that the slab has reached the established dry standard.
Need Professional Structural Drying in Sarasota or Bradenton?
Removing the visible water after a leak is only part of the job.
The bigger question is:
What moisture is still inside the building?
ServiceMaster SRQ provides professional water extraction, moisture inspection, water-damage mitigation and structural drying throughout Sarasota, Bradenton and surrounding Southwest Florida communities.
Our structural-drying work is overseen by IICRC Applied Structural Drying (ASD) certified expertise and uses moisture-detection equipment to determine what became wet, establish controlled mechanical drying conditions, monitor the materials as they dry and adjust the drying system based on actual conditions.
That means we don't stop looking simply because the drywall has reached a dry reading. Where the loss requires it, we also evaluate structural materials such as the bottom plate and framing so we know the wall assembly – not merely its visible surface – has actually dried.
Concrete requires the same kind of material-specific thinking. A slab that appears dry at the surface may still contain internal moisture, so the concrete may need to be drilled and tested to determine whether it has reached the appropriate dry standard. In our structural-drying work, that target is approximately 20% or less on the applicable concrete meter scale.
We also don't pull equipment simply because the project has reached Day 3.
Three days may be a common initial drying period, but we measure the materials and follow the drying process until the appropriate drying goals are reached.
If the drying equipment causes a measurable increase in your electric bill, keep the bill and several months of prior utility statements. That additional expense may be eligible to be submitted to the insurance carrier as part of a supplemental claim, depending upon the policy and claim.
If your home or business has experienced water damage, stop the source when safely possible and begin addressing the remaining moisture promptly.
Contact ServiceMaster SRQ for professional water-damage mitigation and structural drying in Sarasota, Bradenton and surrounding Southwest Florida communities.