Concrete Cork Expansion Joint
This information reflects our best understanding of product composition in 2015.
Expansion joints are added to concrete construction to absorb the small expansions and contractions that occur when concrete is exposed to changes in temperature. Without expansion joints, the concrete would stress, crack, and lose structural...
Expansion joints are added to concrete construction to absorb the small expansions and contractions that occur when concrete is exposed to changes in temperature. Without expansion joints, the concrete would stress, crack, and lose structural integrity. Cork expansion joints are one type of expansion joint. Described by ASTM D1752 as Type II, they are made of “composition cork,” or small cork granules amalgamated and bound together with a phenolic resin, and treated with heat and pressure. The joints are placed against concrete forms at predetermined intervals prior to pouring the concrete. Cork expansion joints are recommended where a high level of resiliency is needed, and can be sealed with various expansion joint sealant products after the surrounding concrete has cured.