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Insulating a Crawl Space
Why install insulation in a crawl space? A crawl space is an unfinished, accessible area below the ground floor of a building. Proper insulation can help protect your living space from outside temperature changes and cold or hot air moving in through the bottom of a house.
There are two types of crawl spaces: vented and unvented. Vented crawl spaces open to the outside, while an unvented crawl spaces is part of the basement – finished or unfinished.
In a vented crawl space, the underfloor should be insulated — similar to how it is in ceilings. This may be done before or after the subfloor has been installed. JM ComfortTherm®, Kraft-faced and unfaced insulation are all possible products to use for this application. With Kraft-faced insulation, the facing is generally against the subfloor.
In an unvented crawl space, you should insulate the perimeter walls.
Recommended Products
Unfaced Batts & Rolls
![](/content/dam/jm/global/en/bi-homeowner/Unfaced%20142x87.jpg)
AP™ Foil
![](/content/dam/jm/global/en/building-insulation/images/images-142x87/APFoil_LG%20142x87.jpg)
Kraft-Faced Batts & Rolls
![](/content/dam/jm/global/en/bi-homeowner/KraftFaced%20142x87.jpg)
TempControl® Mineral Wool
![](/content/dam/jm/global/en/bi-homeowner/TempControl%2088.jpg)
Related How-To Guides
Install in a Crawl Space
![](/content/dam/jm/global/en/bi-homeowner/4_Insulating%20Your%20Crawlspace.jpg)
Install Around Objects
![](/content/dam/jm/global/en/bi-homeowner/1_Insulating%20Around%20Objects.jpg)