How to Caulk Shingles

Lift the shingles gently to apply the caulk. You can use the backside of a hammer to help you lift the shingles if they are particularly stubborn.

Apply caulk underneath the shingles. Use a caulking gun to apply a small bead of roofing sealant under each shingle. Gently pull the trigger on the caulking gun to release a bead of caulk. The caulk is best placed under the corner edge of the shingles to prevent curling.

Press the shingles down onto the caulk. Use a standard brick to hold down the shingles and help bond the caulk and the shingles together. Allow the brick to weigh down the shingles for at least 24 hours.