General Contractor Practice Exam

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What is the minimum size requirement for a bed joint in a masonry wall at the foundation?

1/8 inch
1/4 inch
3/8 inch
1/2 inch

The correct answer is: 1/4 inch

The minimum size requirement for a bed joint in a masonry wall at the foundation is typically 1/4 inch. This thickness is important as it ensures proper bonding between the units, allows for the necessary mortar coverage, and accommodates any slight variations in the size of the masonry units. A joint that is too thin may not allow for adequate mortar to fill voids or provide enough adhesion between the bricks or blocks, which can compromise the structural integrity of the wall. Additionally, a 1/4 inch joint assists with our ability to accommodate moisture and thermal expansion, which is essential in maintaining the longevity and stability of the masonry construction. While the other options represent various joint thicknesses, they do not meet the minimum industry standards for bed joints in this specific application. Therefore, the size of 1/4 inch is both practical and compliant with masonry construction practices.