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Basement Box Sill Insulation


Because they are located below grade, basements naturally are cold and damp. Poorly insulated basement box sills add to the problem, making the space feel even colder.

Box sills are located around the edge of the basement ceiling where joists meet the wall of the basement.

This is one of the thinnest points in a homes exterior. With little protection from the outside air temperatures, box sills can dramatically affect the temperature in a basement.

Many installers place fiberglass batt insulation in a box sill to insulate the area. Although this insulates, this technique does not seal the many air leaks that are found around box sills. We recommend using spray foam insulation to insulate and air seal this area.


Ready to improve the conditions in your basement? Contact us today for a free estimate.

Contact us to schedule your free estimate to add insulation to your basement box sills!