General Contractor Practice Exam

What distance must untreated wood be kept from masonry surfaces?

1. 1/4 inch

2. 1/2 inch

3. 1 inch

4. 2 inches

The correct answer is: 1/2 inch

Untreated wood must be kept a minimum distance of 1/2 inch from masonry surfaces to prevent moisture-related issues. This spacing is critical because masonry materials, such as concrete or brick, can retain moisture. When untreated wood comes into direct contact with these materials, the potential for moisture absorption increases significantly, which can lead to wood decay or damage over time. Maintaining a gap allows for better air circulation and reduces the likelihood of moisture being trapped between the wood and masonry, thereby protecting the integrity of the wood. In construction practices, this requirement is often governed by building codes or industry standards to ensure longevity and structural durability.