A built-up girder should have how many inches of clearance between the end of the girder and masonry in a masonry pocket?

The appropriate amount of clearance between the end of a built-up girder and masonry in a masonry pocket is 1/2 inch. This clearance is crucial for several reasons.

Firstly, it allows for any potential expansion or contraction of the materials. Both wood and masonry can respond to changes in temperature and moisture by expanding or shrinking. The 1/2-inch clearance provides enough room for this movement without causing undue stress on the girder, which could lead to structural issues over time.

Secondly, this clearance helps to prevent moisture accumulation at the end of the girder. If a girder is too tightly fitted in a masonry pocket, it can trap water, promoting rot and deterioration of the wood. The 1/2 inch acts as a safeguard, ensuring that air circulation can help keep the area dry.

Choosing 1/2 inch for this clearance aligns with standard best practices in construction, ensuring the durability and longevity of the support structure.