Solvent-based Butyl Sealant
This information reflects our best understanding of product composition in 2022.
Solvent-based butyl sealants are typically used for flashing and for sealing gutters, downspouts, chimneys, and aluminum and vinyl siding. They can also be used to seal around windows and doors, for sealing curtain wall joints and metal panel...
Solvent-based butyl sealants are typically used for flashing and for sealing gutters, downspouts, chimneys, and aluminum and vinyl siding. They can also be used to seal around windows and doors, for sealing curtain wall joints and metal panel joining, as secondary glazing seals, and as sealing against Neoprene or EPDM gaskets. Solvent based butyl sealants may be used below grade, such as around concrete foundations, but are not recommended for applications where they would be submerged in water. They are typically paintable and non-staining. The advantages of solvent-based butyl sealants are that they are low-cost, water-resistant, have excellent adhesion to most materials (wood, metal, glass, concrete, masonry), are resistant to weathering, and are permanently flexible. The disadvantages are that they provide limited joint movement, are often stringy and difficult to apply, are slow to cure, and commonly rely on hazardous solvents. Hazardous solvents are of particular concern to installaers and others in the area who may be exposed during installation. Non-skinning/non-curing versions are less commonly available and are therefore not represented in this research.
The historical version of this CP can be found here: https://pharos.habitablefuture.org/common-products/2222923