Red Seal Lather (Interior Systems Mechanic) Practice Exam

What is a common technique used to finish drywall joints and prevent cracking?

1. Applying a coat of paint early

2. Tapering the edges of the joint compound

3. Using larger drywall sheets

4. Fastening screws closer together

The correct answer is: Tapering the edges of the joint compound

Tapering the edges of the joint compound is a widely recognized technique in drywall installation and finishing. This approach involves creating a smoother transition between the joint compound and the drywall surface by gradually thinning the edges. This tapering helps to blend the seam more seamlessly into the surrounding drywall, reducing the likelihood of visible seams and cracks. The reason this technique effectively prevents cracking relates to the distribution of stress over the joint area. When the compound is applied with tapered edges, it allows for more even stress distribution as the drywall expands and contracts, minimizing the chances of tension that could lead to cracks forming at the joint. Additionally, tapering facilitates the application of subsequent layers of joint compound, enabling a smoother and more visually appealing finish. This is crucial not only for aesthetic purposes but also for the longevity of the drywall installation, as a well-finished seam is less prone to issues over time compared to a flat or poorly finished joint.