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Sealing & Caulking Your Foundation

A primary place where cold air can enters the house is where siding meets the foundation. A quick remedy is to caulk the space in between. It is also a good idea to fill and seal all exterior areas where different materials meet, such as where flashing abuts concrete.

Foam caulk fills large gaps. Photo: GE

Foam caulk fills large gaps. Photo: GE

A good choice for this application is a latex-based caulk that can adhere well to concrete and masonry. There are latex-based sealants that are impregnated with silicone for extra water resistance, durability, and adhesion. A polyurethane sealant designed for concrete and masonry can also do the job. Both types are paintable.

For larger gaps or cracks, you may wish to use a latex-based insulating foam sealant. The foam expands into the area to be sealed, providing an effective barrier against drafts and pests. This type of sealant can also be painted once it has set. You can buy insulating caulk online.

About Don Vandervort
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Don Vandervort developed his expertise more than 30 years ago as Building Editor for both Sunset Books and Home Magazine. He has written more than 30 home improvement books and countless magazine articles. He appeared regularly on HGTV’s “The Fix,” and served as MSN’s home expert. Don founded HomeTips in 1996.

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