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Insulating Crawl Space

Before: Traditional Crawl Space with debris, old plastic and vent

The crawl space located under the house is also an area with a lot of energy loss – 35% on a typical home.  We have two different solutions for the crawl space.

If you have HVAC ductwork located under the house, we recommend creating a clean, insulated, encapsulated crawl space.  We clean away the debris from under the house and grade the dirt on the crawl floor.

After: Insulated Sealed Crawl Space – Closed Cell Spray Foam on walls and 15 mil plastic on floor

We then install a heavy duty 15 mil plastic vapor barrier on the crawl floor.  We overlap the seams by at least 12 inches and tape the seams with a specialty tape.  We extend the vapor barrier up at least 6 inches on penetrations and secure the vapor barrier with specialty tape.  We spray Closed Cell Spray Foam Insulation on the perimeter walls of the crawl space as the crawl space insulation.  This Clean, Insulated Sealed Crawl Space system puts the crawl space within the building envelop – eliminating air leakage from the living space and leakage from the ductwork.

If the HVAC ductwork is not under the house, then we recommend installing Closed Cell Spray Foam Insulation on the crawl space ceiling as the crawl space insulation.  We first remove all the existing fiberglass batt insulation from the crawl ceiling – usually some of it is dangling.  We then spray Closed Cell Spray Foam between the floor joist onto the subfloor creating a moisture retarder and an air barrier.  We eliminate the moisture drive and drafts coming from the crawl space – improving the energy efficiency, comfort and indoor air quality of the home.

In summary, there are two approaches for insulating your crawl space.  Crawl space encapsulation is typically more expensive but provides the additional benefit of creating a clean space and keeping the air leakage from HVAC ductwork inside the building envelop.  The other approach of installing spray foam directly to the subfloor is more cost effective and is the preferred method when the HVAC ductwork is not located in the crawl space.  Both approaches are going to make the home more comfortable and energy efficient.

Check out Insulating Your Home to learn more about Summit Green Solutions’ approach for the rest of your home.

Request a free quote for spray foam insulation your crawl space.

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