Butyl Caulk

By Mark J. Donovan

Butyl caulk is the perfect caulk for exterior home applications. It is frequently used for concrete block, concrete, stone, and brick applications. It is also adheres well on aluminum siding, fireplaces and flashing.

Butyl caulk is difficult to work with and it is extremely messy. Conseqeuntly it is difficult to clean up, and will require paint thinner to remove it off of unwanted surfaces. It is also has a long curing time and a high shrinkage factor. It typically has a lifespan of 8-10 years and is available in many colors. It can support applicaitons with gaps up to ¼ inch.

To learn more about caulk alternatives see Types of Caulk.