How to Finish Inside Drywall Corners

Weekend

Stop hairline drywall cracks from developing in five simple steps

Drywall Corners

Inside drywall corners can develop hairline cracks that over time can grow larger and visible through your paint, so it’s important to take a few precautionary steps during drywall installation to prevent these cracks. This guide outlines this technique of coating drywall corners with compound and applying tape.

WHAT YOU NEED FOR THIS PROJECT

1
Coat both walls corner drywall compound
Coat both walls corner drywall compound -  Finish Inside Drywall Corners

Use a 6-inch joint knife to fill any gaps between the two walls with drywall compound.

2
Apply drywall tape
Apply drywall tape -  Finish Inside Drywall Corners

Tip: When working with tape, the longer the better, but you may have to experiment to find a length that is easy to handle.

• Unroll several lengths of drywall tape to cover the corner, overlapping the ends.
• Fold the tape in half along the crease made by the manufacturer.

3
Push tape joint compound
Push tape  joint compound -  Finish Inside Drywall Corners

• Draw a knife along each wall to press the tape into the compound about every 12 inches.
• Remove excess mud.
• Let the compound dry overnight.

4
Apply joint compound one side corner
Apply joint compound one side corner -  Finish Inside Drywall Corners

• Using the 6-inch joint knife, apply joint compound to one side of the corner.
• Feather the outside edge and let it dry overnight.

5
Apply joint compound other side
Apply joint compound other side  -  Finish Inside Drywall Corners

• Once the first side is completely dry, apply joint compound to the other side.
• Smooth, feather and let dry.
• Repeat the process to apply a third coat on both walls, one wall at a time. Let dry overnight once more, and then sand and smooth.