What Is Roof & Gutter Silicone Made Of?

Silicone Caulk Ingredients

• Silicone caulk is produced by condensing silica sand down to a silicone oil polymer and adding fillers, such as clay and mica, both of which give the caulk thickness and spreadability. The oil in the caulk makes it impossible to paint over but increases its ability to strongly adhere to nonporous surfaces, such as metal, glass and fiberglass.

Performance

• Although the oil in silicone sealants slowly leaches out after years, it remains flexible. This elasticity makes it ideal for holding up against the harsh weather conditions on roofs and in gutters. The caulk is impervious to snow, rain, extreme temperature fluctuations and constant exposure to the sun’s ultraviolet rays.

Application Procedures

• Silicone applications for roofs and gutters usually take less than 10 minutes, depending on the number and size of the areas being reinforced or repaired. The caulk is applied into tight spots with a gun equipped with a plunger and spout, or spread on large, flat areas with a trowel. It fully cures in five to seven days, depending on the humidity. Higher humidity hastens the curing process.

Alternate Uses

• Besides roofs and gutters, silicone sealant is used on skylight frames, pipe and sprinkler system hardware, and heating and air-conditioning ducts. Although its adhesive qualities are not as dependable on porous surfaces, it is frequently used to repair minor cracks in bricks, cinder blocks, concrete, drywall and other common building materials.

Safety Precautions

• Silicone easily irritates skin, so wear rubber gloves and eye goggles for protection when mixing or applying it. If silicone gets on your skin, thoroughly wash the affected area and consult a physician. The vapors emitted by the silicone as it dries come from acetic acid, one of the main components of vinegar, and can irritate eyes and respiratory systems. Some building material manufacturers make silicone sealants without mineral spirits for use by highly sensitive people.