Structural drying, not just surface drying
A floor can feel dry to the hand while the subfloor, the bottom plate of the wall and the back of the drywall are still wet. That is the difference between surface drying and structural drying. IICRC S500 is the industry drying standard, and it sets out how a water loss is classified, how the drying equipment is chosen and how dry is verified. The finish line is a reading, not a feeling: wet materials are dry when they sit within 2 to 4 points of a dry reference material in an unaffected part of the same building.
How the equipment is sized
The tech who does the walkthrough maps moisture with thermal imaging and pinless and pin meters, then sets the class of water. Class 1 through 4 sets how much equipment a room needs: Class 1 is a small area of low-porosity material, Class 3 is wet walls, ceilings and carpet, and Class 4 is dense, slow materials such as hardwood, plaster, brick and concrete.
- Air movers set to the evaporation load of each room
- LGR dehumidifiers that keep pulling water out of humid Middle Tennessee air
- Desiccant dehumidifiers for Class 4 materials and cool crawlspaces
- Floor drying mats for hardwood and cavity injection for wall and cabinet voids
The EPA moisture guidance explains why the first 24 to 48 hours matter so much.
Franklin's summer humidity is why dehumidification matters here. Opening windows on a muggy day can add water to a house faster than fans remove it.
Franklin materials that dry slowly
The historic homes around Main Street and Hincheyville carry plaster on wood lath, heart-pine floors and old-growth framing. Those dense materials hold water and give it up slowly, so they are Class 4 work with desiccants and a longer schedule. Newer homes bring engineered hardwood, which can delaminate if dried too hard, and crawlspace framing, which needs its own enclosed dehumidification; see crawl space water damage. The drying team records readings daily and moves equipment to whatever is still wet. Equipment stays until the readings say dry. The UT Extension publishes home moisture guidance for Tennessee households, and extraction before drying is covered on water extraction.
