What moisture content percentage is considered dry for lumber?

In the context of lumber, the moisture content percentage that is typically considered "dry" is 19%. This threshold is crucial in the building industry because the moisture content in wood can significantly affect its performance and durability.

When lumber has a moisture content of 19% or lower, it is deemed to be in a dry state, which reduces the risk of problems such as warping, shrinkage, or fungal growth during service. Different wood types and applications may necessitate specific moisture content levels, but 19% is a widely accepted standard for dry lumber in residential construction.

This percentage helps ensure that the wood is stable and minimizes the likelihood of defects that might arise from excessive moisture, which is particularly important in creating a safe and lasting structure. Understanding moisture content is essential for anyone working in building construction, as it can have implications for both material selection and overall project integrity.