Polyurethane Sealants, like Single Component Polyurethane Sealants and Double Component Polyurethane Sealants are two popular types of sealant.
They are used to fill gaps, to keep water and air at bay, to allow for expansion and contraction of building materials, and to enhance aesthetics. Silicone and polyurethane are used in these sealants.
While a polyurethane joint’s lifespan is typically 5-10 years, a silicone joint’s lifespan is typically 20+ years. Why is there such a big difference? Simply put, at the end of the day, a silicone joint’s lifespan is longer because, chemically, it won’t break down. Like UV light, temperature plays a role too. Silicone is better suited for temperature extremes. This is especially important in the Mid-Atlantic where we have some of the most dynamic thermal cycles in North America. Changes in temperature cause the joints to expand and contract. Typically, the more flexibility the sealant allows the better. Silicone allows for greater movement if that’s what’s necessary.