Insulating Crawl Spaces with Spray Foam

If your crawlspace is damp and unwelcoming, adding spray foam insulation might be just the thing to make this space more hospitable.

Like basements, crawl spaces are subject to moisture buildup from the ground around them. This dampness build up can produce mold and mildew. It can also buckle the floor coverings in the rooms above the crawl space. Spoiled wood floors can pose a trip hazard as well as costing significant dollars to repair or replace.

If your floors are cold to walk on, it might be because of inadequate insulation in the crawl space below. You can insulate this space in two ways. You can insulate the crawl space ceiling which creates a thermal barrier between your floor and the crawl space. Using closed cell spray foam in this instance will also impede the flow of moisture between the crawl space and living spaces. Foaming the ceiling will not impact the venting of the space and this method is called a vented application for crawlspaces.

An unvented crawlspace is achieved by using spray foam on the walls. Any ductwork which might be located inside the unvented space is now enclosed in a temperature controlled environment. Your HVAC equipment or air handler won’t have to work as hard either. You also will notice that moisture won’t condense on the ductwork anymore.

Warmer floors, less moisture and condensation and a more hospitable crawlspace environment are all benefits of sealing off air flow completely with spray foam. Typically, crawl spaces are not the easiest of spaces to insulate especially with all the nooks and crannies that construction creates. By using spray foam, you create a clean environment underneath your floors that insulates and protects your building structure, too.

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