Caulking openings wider than one-quarter inch or more than one-half inch deep requires backing material such as foam rope.

Flexible Sealing Solution for Indoor and Outdoor Use: This versatile caulking cord forms a durable, flexible seal that is perfect for both indoor and outdoor applications. It effectively seals out ...

Rope caulk is extremely simple to use. It comes in a long, rope-like form that requires no caulk gun or applicator, so it's a ...