How Does Drywall Joint Tape Work?

Written by josienita borlongan
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How Does Drywall Joint Tape Work?
Fiberglass Drywall Joint Tape (lakewoodconferences.com, Shopping.com, alibaba.com)

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Types

Use drywall joint to connect drywall pieces together. There are different types of drywall joint tapes. The first type is the paper drywall joint tape, made mainly with paper, as its name suggests. It comes in different sizes and lengths. The paper backing does not have a sticky or adhesive side; therefore, you need to perform pre-plastering during installation. Paper tends to trap air bubbles, which can cause blisters on the surface. Press out the bubbles before the compound dries in order to have a smooth finish. The next type is the fibreglass drywall joint tape, which has an open mesh that will not trap air to cause bubbles and blisters. Made from fibreglass, this tape does not have a sticky or adhesive side, which eliminates the need for pre-plastering. The third kind is the veneer self-adhesive drywall joint tape. This saves time by eliminating the need to perform coat embedding. This will not cause blisters and bubbles due to trapped air. Use this with a setting type of compound.

Fibreglass Drywall Joint Tape
Fibreglass Drywall Joint Tape

Joint Compound

On their own, drywall joint tapes are not strong or sticky enough to hold the drywall joints together. They are only effective when used with joint compound, also known as mud. Joint compounds are similar to plasters in appearance and consist of water, limestone, expanded perlite, ethylene-vinyl acetate polymer and attapulgite. When combined, they produce a white, creamy consistency. Some joint compounds come pre-mixed or ready-to-use for ease of application. Using pre-mixed joint compound saves time spent on preparation and prevents inconsistencies in mixtures that may arise from wrong measurements. On the other hand, the traditional kind of drywall joint compound comes in a powder form mixed at the site with water in order to make it creamy in consistency prior to use. It dries faster than the ready-mix drywall joint compound.

How Does Drywall Joint Tape Work?
Joint Compound

Application

In order to get a strong bond, apply several layers or coats of joint compounds. Applying three layers of joint compound is common practice. Use a wide putty knife or spatula to apply the joint compound. The putty knife will help in the smooth and even application of the compound. With a paper drywall joint tape, apply a thin layer of compound on the seams of the drywall joints, and then apply the paper tape on top. Allow it to dry and then apply another layer. Allow it to dry again before adding the last layer of compound. For the fibreglass tape or mesh, stick the adhesive side on top of the seams, then apply the first coat of compound. Let it dry before adding the next layers. The second layer or coat is what usually hides the tape; the third coat is just to finish it off. Make sure to apply a thin layer and skim it on the second layer, then apply the third coat over if after drying. Some joint compounds come pre-mixed or ready-to-use for ease of application. Using pre-mixed joint compound saves time spent on preparation and prevents inconsistencies in mixtures that may arise from wrong measurements. On the other hand, the traditional kind of drywall joint compound comes in a powder form mixed at the site with water in order to make it creamy in consistency prior to use. It dries faster than the ready-mix drywall joint compound.

Putty Knife
Putty Knife

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