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Drying time guide

No chart can say how long a building takes to dry. Here is what changes it, and how to know it is done.

For restoration

Drying is verified, not timed

Water, materials and air differ on every job, so drying is confirmed with moisture readings. Always confirm with a moisture meter.

General background, not advice for a specific job.

What changes drying

Materials
Thick, dense or layered materials hold water longer than thin, open ones. Wood, plaster, concrete, insulation and subfloor each behave differently, so read each one on its own.
Water category and class
IICRC S500 sets out categories (how clean or contaminated the water was) and classes (how much water, and how fast the materials take it up). Contaminated water changes what can be dried and kept, and how you work.
Airflow
Moving air carries moisture off wet surfaces. Dead air behind furniture, under cabinets and inside closed cavities dries slowest.
Dehumidification
Air that is already full of moisture cannot take more. Taking moisture out of the air keeps drying going.
Temperature and humidity
Warm, drier air dries things faster; cool, humid air slows it. Measure both with a thermo-hygrometer instead of guessing.

How to check it is dry

  1. Take a dry reference. Read the same kind of material somewhere the water never reached. That is your comparison for that material.
  2. Mark your spots. Mark the points you read, wettest ones included, so every visit reads the same places.
  3. Read every visit. Write down the date, room, material and reading. Add the room’s temperature and humidity if you have a meter.
  4. Adjust. If readings stall, change the airflow or dehumidification, or look for a hidden source of water.
  5. Confirm dry. Stop only when every spot has reached its target. If you are unsure, keep drying and read again.

The standard

IICRC S500 is the industry standard for professional water damage restoration. Follow its current edition. This guide does not quote it and does not replace it.

Drying log

DateRoomMaterialReadingTarget

Questions

How long does drying take?

It depends on the material, the water, the airflow, the dehumidification and the air in the room, so no number fits every job. Drying is confirmed with moisture readings, not a clock.

What does a moisture meter tell me?

How wet a material is compared with a dry reading of the same kind of material. Take that reference from a spot the water never reached, then read the same marked spots each visit.

When can the equipment come out?

When your readings reach the dry target, not when it feels or looks dry. If you are not sure, keep drying and read again.

What is IICRC S500?

The industry standard for professional water damage restoration, from the IICRC. Follow its current edition. This guide is background and does not quote or replace it.

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