North Carolina Building Contractor License Practice Exam

What moisture content must pressure treated wood have before insulation is applied?

1. 15% or less

2. 10% or less

3. 5% or less

4. 3% or less

The correct answer is: 10% or less

Pressure treated wood should have a moisture content of 19% or less before insulation is applied, as this is crucial for ensuring that the wood is adequately dried and stable. However, in practices that aim for optimal conditions, a moisture content of 10% or less is often recommended to prevent potential issues like mold growth or wood deformation. When moisture is retained in pressure treated wood, applying insulation can trap moisture within the assembly, which may lead to decay or deterioration over time. By ensuring that the moisture content is at or below this threshold, it helps to create a drier environment that is less conducive to unwanted biological growth and improves the overall durability of the structure. In the context of construction and insulation, managing the moisture content of wood is essential for maintaining the structural integrity and longevity of building materials.