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What Kind of Caulking Do You Use on Wood Windows?

Caulking windows closes the gaps where the window frame fits into the window opening. Closing these gaps prevents the entrance of warm air into the home during the summer and cold air during the winter. This action reduces energy costs associated with heating and cooling and improves the comfort of the home. Using the proper caulk improves the longevity of the caulk seal and extends the length of time between applications.

  1. Construction Grade Silicone

    • Construction grade silicone is used in gaps between two different materials. Use this type of caulk if you’re sealing a gap between wood windows and a brick or masonry wall, for example. Silicone doesn’t shrink and will stretch to maintain a seal even if the window or wall shrinks or expands because of temperature or humidity. Silicone sticks to the window and wall well. You can apply silicone to a painted surface but you cannot paint over silicone caulk.

    Polyurethane

    • Polyurethane foam expands to fill the gap between the window and wall. The material doesn’t shrink and is known for its expansion capabilities. This makes it ideal for larger gaps between the window and wall. Polyurethane caulk should be painted, with an exterior grade paint, for weather protection if the caulk is used outdoors.

    Rubber

    • Butyl rubber is also used to seal different types of materials. The material shrinks as much as 30 percent but adheres well to wood and other materials. Butyl rubber lasts up to 10 years and can be painted after it cures, which may extend its durability. Follow safety precautions using the toxic butyl rubber.

    Applying Caulk

    • The application process is as important as the material when it comes to caulk efficiency. Clean the surface of the window and wall before applying the caulk. Remove any paint or caulk with a utility knife or screwdriver and wipe clean. Apply caulk of any type only to dry surfaces. Apply the caulk in a continuous bead the length of the window filling the gap so the material touches both sides of the gap.

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