A carpenter is applying several coats of joint compound to a drywall joint using paper tape. After the first coat, they notice significant cracking along the tape. What is the most likely cause of this cracking?

Question: A carpenter is applying several coats of joint compound to a drywall joint using paper tape. After the first coat, they notice significant cracking along the tape. What is the most likely cause of this cracking?

Answer options: ✅ The joint compound was too thick in the first coat, leading to excessive shrinkage.

• The joint compound was too thin, and the tape wasn't properly embedded.
• The temperature in the room was too low, causing the compound to freeze.
• The drywall sheets were not installed with adequate spacing at the joint.

Correct answer: The joint compound was too thick in the first coat, leading to excessive shrinkage.

Explanation: Applying joint compound too thick in the initial coats, especially with paper tape, is a common cause of cracking due to the large amount of water needing to evaporate and the resulting shrinkage. The compound being too thin would likely lead to poor adhesion or blistering rather than cracking, and freezing would create a different type of failure.