What Is Butyl Caulk?
Butyl caulk is a rubber based caulk that works particularly well in outdoor applications. It is well suited for applying on concrete, concrete block, brick, and stone. It does a good job of acting as a sealant when used on gutters, flashing, chimneys, and aluminum siding. Butyl caulk’s bonding ability in wet conditions makes it a particularly good choice for use underground as well as on roofs.
