Red Seal Lather (Interior Systems Mechanic) Practice Exam

Which product is commonly used to close gaps in drywall joints?

1. Joint tape

2. Joint filler

3. Sealant

4. Spackle

The correct answer is: Joint tape

Joint tape is commonly used to close gaps in drywall joints because it reinforces the joint compound applied over the seams of drywall sheets. When installed, joint tape helps to create a smooth and uniform surface, which is essential for achieving a professional finish in drywall installations. It acts as a bridge to hold joint compound securely in place and prevents cracking as it dries and settles. The primary function of joint tape is to provide support to the joint compound and to help blend the drywall seams into the surrounding surface, ensuring that the joints are less visible after the finishing process. The combination of joint tape and joint compound results in a strong and durable bond that maintains the integrity of the finish over time. Different products serve various purposes when working with drywall. Joint filler, for instance, is used primarily to fill in larger gaps or holes rather than specifically for the seams where drywall sheets meet. Sealants are usually employed for different applications, such as waterproofing or air sealing, rather than for drywall seams. Spackle is more suited for smaller repairs and touch-ups rather than as a systematic approach to sealing drywall joints during initial installation.