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If your window has gaps larger than 1/2 inch, caulk may not work well. If these gaps are deep, expanding foam insulation designed for window and door use may be necessary to fill the cavity.
Re-caulk the windows.: On older windows, the caulk or glazing may be failing. For best results, remove any old caulk or glazing before applying the new product.
Make sure you use a caulk that's designed for windows and doors. Weatherstripping While caulking is best for filling in small gaps, weatherstripping is a better heavy-duty option for larger gaps ...
Modern caulking compounds are flexible sealing compounds used to close up gaps in buildings and other structures against water, air, dust, insects, or as a component in firestopping. In the tunneling industry, caulking is the sealing of joints in segmental precast concrete tunnels, commonly by using concrete .
Typical weatherization procedures include: Sealing bypasses (cracks, gaps, holes), especially around doors, windows, pipes and wiring that penetrate the ceiling and floor, and other areas with high potential for heat loss, using caulk, foam sealant, weather-stripping, window film, door sweeps, electrical receptacle gaskets, and so on to reduce infiltration.
A caulking sealant has three basic functions: It fills a gap between two or more substrates; it forms a barrier due to the physical properties of the sealant itself and by adhesion to the substrate; and it maintains sealing properties for the expected lifetime, service conditions, and environments.