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Basement Wall Insulation


This video talks about Foundation Insulation and how insulating your foundation can save you energy & money! Dr. Energy Saver can show you how much energy you are losing through your uninsulated foundation walls.

Basement wall insulation doesn't get the attention it deserves. One reason for this is that many builders choose to insulate the basement by installing fiberglass batt insulation between basement ceiling joists.

This treatment doesn't really qualify as basement insulation because it's actually insulating the floor above from whatever temperature conditions prevail in the basement.

By insulating basement walls, you're bringing this lower level of the house inside the building envelope, making it more comfortable and more energy efficient.

Fiberglass isn't recommended as basement wall insulation

Rigid Foam Board Insulation

Boards, not batts. Instead of using fiberglass batt insulation in the basement, it’s best to insulate basement walls with rigid foam boards. Unlike fiberglass, rigid foam won’t absorb moisture, compress, lose R-value or fall out of place. It improves comfort and energy efficiency in the basement and upstairs, too.

The "old-school" approach to insulating basement walls was to construct 2x4 wood-frame walls inside the basement's masonry walls, and then insulate the stud bays with fiberglass batt insulation.

Today building scientists and topnotch basement finishing contractors recommend avoiding this old-school insulation treatment. Fiberglass batt insulation doesn't perform well in the high-moisture environment of a basement.

R-value drops dramatically when fiberglass insulation absorbs moisture, and wet insulation helps to encourage mold growth and wood rot.

Rigid foam board is excellent insulation for basement walls

The right insulation to use as basement wall insulation is rigid foam insulation. The special SilverGlo rigid insulation board available from Dr. Energy Saver won't absorb moisture or support mold.

It can't settle or compress like fiberglass insulation, and it can stop cold air infiltration instead of allowing it to pass through the insulation layer.

As a bonus, SilverGlo insulation has an integral radiant barrier that reflects heat for additional comfort and energy savings.

SilverGlo rigid foam insulation is usually installed directly against the basement's masonry walls, secured with adhesive and masonry fasteners. Building code may require the insulation to be covered by a fire-resistant material like moisture-resistant gypsum board.

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