How to Caulk to Seal a Drywall Foundation

Drywall is a cheap building material used in many of today's homes. The drywall board is a mixture of stone pressed between two pieces of thin paper. Drywall is strong but will not keep out air leaks if it isn't properly seamed. Most builders know to apply tape between the drywall panel seams to hold the wall together but sometimes forget that caulking the base of the drywall to the floor or home foundation will create an air-tight seal.

Scissors
Caulk
Caulk gun
Screw or nail
Paper towel or rag

Instructions

- 1
  Cut off the end of a tube of caulk with a pair of scissors. Make the cut at a 45-degree angle. This keeps your caulk application smooth.
- 2
  Insert the caulk tube into a caulk gun.
- 3
  Poke a nail or screw into the end of the caulk tube to break the seal inside. Press the caulk gun trigger a few times to get the caulk flowing then wipe the end with a wet paper towel or rag.
- 4
  Run the end of the caulk tube along the bottom of the drywall board and the top of the floor or the home foundation to fill the gap between.
- 5
  Wet your finger and run it along the caulk to force it between the floor or foundation and the base of the drywall. Allow the caulk to dry, according to the instructions on the packaging, before painting the drywall.

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