A vapor barrier is a material that is installed beneath a floor covering to prevent moisture from migrating up into the flooring from the subfloor. Moisture can cause several problems for hardwood floors, including:
- Buckling
- Cupping
- Crowning
- Warping
- Rotting
Vapor barriers are typically made of polyethylene or aluminum and are installed between the subfloor and the underlayment.
In addition to preventing moisture damage, vapor barriers can also:
- Improve energy efficiency by reducing heat loss through the floor
- Reduce noise transmission between floors
- Prevent mold and mildew growth
What is an Acceptable Moisture Reading in a Hardwood Floor?
The acceptable moisture reading in a hardwood floor depends on the species of wood used and the climate in which the floor is installed. In general, a moisture reading of 7% to 12% is considered acceptable. However, some species of wood, such as red oak, can tolerate a moisture reading of up to 14%. It is essential to check the manufacturer’s recommendations for the specific type of wood flooring you are installing.