such as beneath a moving sash. Whereas caulk will seal the joint, weather stripping allows you to open and close the window, sealing the gap tightly once the window is closed. Most foam weather ...

Do window insulation kits actually work? Yes! They seal off drafty windows so you can spend less on your home heating bills.

Over time, seals can lose elasticity, leading to small but significant gaps. No matter how well the window is constructed, these components greatly influence the effectiveness of thermal insulation.