What is the Window Seal?
The window “seal” refers to any part of the window installation that blocks out the exterior environment. Most often, the term “seal” is used for weatherization and energy efficiency applications, and usually refers to the sashes (in sliding windows) and lites (window panes). Why Do Window Seals Fail? Seals can sometimes fail due to: • Pressure building between the two panes of glass during hot days (referred to as “heat pumping”) • Contracting/shrinking in the colder months • Expansion and contraction of the sealant material itself Seals fail most frequently on windows facing south or west due to longer exposure to the sun. Too much direct sunlight deteriorates the original sealing material more quickly than windows facing in other directions. When considering new windows, always opt for solid, long-term, transferable warranties (20-year warranties are preferred) because the windows will not only perform better for longer, but the transferable warranty also adds resale value. Window S
