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The Structural Drying Process Explained
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The water is gone, so you are done, right? Not even close. Your walls, subfloor and framing are still holding moisture you cannot see, and that is where mold and rot begin. Welcome to the science of getting a building truly dry.
Need drying done right? Call (302) 400-8531, 24/7 structural drying.
(302) 400-8531The Science: Psychrometry
Professional drying uses psychrometry, the science of moisture-air relationships. Warm air holds more moisture than cool air. Commercial air movers create velocity across wet surfaces, accelerating evaporation. Dehumidifiers capture that evaporated moisture from the air. The balance between evaporation rate and dehumidification capacity is calculated, not guessed.
The Equipment
| Equipment | What It Does |
|---|---|
| Axial and centrifugal air movers | Create high-velocity airflow across surfaces to speed evaporation |
| LGR dehumidifiers | Refrigerant units that remove moisture from warm, humid air |
| Desiccant dehumidifiers | Work well in low temperatures and for dense materials |
| Moisture meters (pin and pinless) | Measure actual moisture in materials |
| Thermal imaging camera | Reveals temperature patterns that indicate wet areas |
| Thermo-hygrometer | Measures temperature and humidity to calculate grains per pound |
| Wall cavity and floor drying systems | Dry enclosed cavities and hardwood without full removal |
How a Drying Job Works
Map the moisture
Establish what is wet and how wet.
Set a dry goal
Compare to unaffected reference materials.
Calculate equipment
Determine air movers and dehumidifier capacity.
Create a drying environment
Seal the area, control temperature, and start airflow.
Monitor daily
Take readings and adjust.
Confirm dry standard
Document final readings.
Remove equipment
Only after verification.
Why Fans and Open Windows Fail
- Household fans lack the velocity for effective surface drying.
- Delaware’s summer humidity means open windows add moisture.
- Without dehumidification, evaporated moisture re-deposits on cool surfaces.
- Without moisture meters, you cannot confirm the actual dry standard.
- Hidden moisture in wall cavities and under flooring stays behind.
Special Drying Situations
| Material | Challenge | Approach |
|---|---|---|
| Hardwood | Cupping and bound water | Floor drying systems with controlled energy |
| Plaster and masonry | Dense, slow release | Desiccant and extended monitoring |
| Wall cavities | Trapped moisture | Injected drying or selective openings |
| Concrete slab | Vapor release for days | Dehumidification and monitoring |
Related Pages
FAQ
Structural Drying FAQs
Why can’t I just run fans?
Fans move air but do not remove moisture from it. Without dehumidification, moisture simply moves around the building.
How do you know when something is dry?
By comparing readings to dry reference materials in the same building.
Is it noisy?
Yes. Commercial equipment is loud and uses electricity, which is usually considered in claim scopes.
How long does drying take?
Usually 3 to 7 days for common materials and 7 to 14+ days for dense Class 4 materials.
Can drying be done without removing drywall?
Sometimes. Wall cavity drying systems can dry some walls in place, depending on the category and condition.
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