North Carolina General Contractors Practice Exam

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What is filled in CMU control joints and to what depth?

Mortar at 1/2" thick
Caulking compound at 1" thick
Caulking compound at 3/4" thick
Concrete at 3/8" thick

The correct answer is: Caulking compound at 3/4" thick

When constructing with Concrete Masonry Units (CMU), control joints play a crucial role in managing cracking due to thermal expansion and contraction. The correct material to fill these control joints is caulking compound, which is designed to accommodate movement while providing a weather-tight seal. The depth of 3/4" allows for sufficient flexibility and movement within the joint, which is important to prevent damage to the masonry structure. This choice ensures that the joint can effectively absorb stresses caused by temperature fluctuations, moisture expansion, and other environmental factors. Additionally, a depth of 3/4" balances between providing enough material to perform its function and not being overly thick, which could lead to adhesion issues or unnecessary stress on the surrounding masonry. Understanding the specifications for control joint filling is essential for maintaining the integrity and longevity of CMU structures.