How Do You Apply Joint Compound?

Applying joint compound, often called "mud," is a key step in finishing drywall. The process involves using joint compound to conceal seams and screw indentations, creating a smooth, paintable surface. Here's how it's done, based on the provided reference:

Preparing for Joint Compound Application

Before you start applying joint compound, make sure:

• Your drywall is properly installed and secured.
• You have all necessary tools:
  • Drywall knives (various sizes, 6-inch, 10-inch, 12-inch)
  • A mud pan or hawk
  • Joint compound
  • Drywall tape (paper or mesh)

Applying Joint Compound: Step-by-Step Guide

Here's how you apply joint compound, specifically when including paper tape for corners:

1. Apply the First Coat (Embedding Tape):

   • Use your drywall knife to apply a thin, even coat of joint compound over the drywall seams or corners, typically where you have a gap between sheets of drywall. The aim is to provide a bed for the tape.
   • For inside corners, place a crease strip of paper tape in the corner (as stated in the video reference). Paper tape is ideal for corners because it's thin and flexible.
   • Embed the tape by pressing it gently into the wet mud using your drywall knife. Make sure the tape is centered over the seam and no air bubbles or wrinkles are left.
   • Apply mud over the paper tape in the corners.

2. Let Dry and Apply Additional Coats (As Needed):

   • Allow the first coat to dry completely. Depending on the humidity, this could take several hours or overnight.
   • After it has dried, apply a second coat of joint compound over the taped area using a wider knife (10-inch or 12-inch) , feathering it out beyond the edges of the first coat to smooth the area out. This coat should be wider to hide the tape and screws.
   • Let the second coat dry completely before sanding.

3. Sanding and Final Coat:

   • After the second coat is dry, use fine-grit sandpaper or sanding sponges to smooth out any imperfections. Be careful not to over-sand and expose the tape.
   • If necessary, apply a third, thin coat of compound, feathering it out even more widely, for an ultra-smooth finish.
   • Let it dry completely before sanding again if needed.
   • The final coat is a very thin skim coat and is also feathered out wider than the previous coats.

Key Considerations

• Paper tape is recommended for corners because it creates a strong, straight line and is more resistant to cracking, as mentioned in the reference.
• When applying compound, apply with even pressure, using a smooth motion of the drywall knife to prevent ridges and bubbles.
• Clean your tools regularly and keep the mud pan free of dried mud.
• Work in a well-ventilated area and use dust masks when sanding.

By following these steps, you'll be able to effectively apply joint compound to create a smooth, seamless surface ready for painting.