Massachusetts Unrestricted Construction Supervisor License Practice Test

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What is the minimum required thickness of a mortar joint in a masonry unit wall in a one or two family dwelling?

  1. 1/4 inch

  2. 3/8 inch

  3. 1/2 inch

  4. 5/8 inch

The correct answer is: 3/8 inch

The minimum required thickness of a mortar joint in a masonry unit wall for a one or two-family dwelling is specified to be 3/8 inch. This size is important as it provides adequate bonding between the masonry units while allowing for some tolerances in alignment and leveling. The thickness also helps accommodate slight variances in the size of the masonry units themselves. Mortar joints that are too thin may not allow for sufficient adhesion and can lead to weakened structures, whereas excessively thick joints can increase the potential for cracking and could compromise the overall stability of the wall. This standard ensures a balance between structural integrity and practicality in construction practices.

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