Rock Wool Supplier’s Tips for Insulating First Floor Crawl Spaces


In earlier blog posts, we’ve talked about insulating a variety of areas in one’s home. Insulating attached garages and wine cellars were just two of the topics that we covered previously. This week, we decided to continue the discussion by providing our rock wool supplier’s tips for insulating crawl spaces. Depending on your home’s layout, the crawl space may be located underneath of your dwelling or in the attic area. Today, we wanted to talk about crawl spaces that are located underneath of a home’s first floor.

Our rock wool suppliers suggest insulating the area with R-13 value rock wool mattresses, rock wool blankets or rock wool slabs and rock wool pipe sections. Of course you’ll only need to invest in the rock wool pipe sections if you have pipes running through your ground floor crawl space. In addition to purchasing the rock wool insulation, you’ll also want to consider obtaining a roll of 6 mil polyethylene sheeting, adhesive caulking, a staple gun, staples, a tape measure and a utility knife.

Once you have your rock wool insulation, polyethylene sheeting and other supplies on hand, double check your crawl space’s measurements. Then cut your sheeting and rock wool insulation to those exact specifications. The sheeting should be used as a vapor retarder.

When installing the vapor retarder, make sure that you take the time to overlap the edges. In our rock wool suppliers’ experiences, a 6 inch overlap should be sufficient. It is also recommended that for optimal efficiency, the overlaps should be sealed with a high-quality adhesive caulking. After you have the entire area covered with the vapor retarder, attach the 6 inch exterior overlaps to the crawl space’s wooden beams. Doing so carefully should ensure that the vapor retarder will remain in place.

Those are obviously just a smattering of our rock wool suppliers’ tips. To learn more about insulating crawl spaces with rock wool insulation, contact us online or by phone. We’d also like to encourage all of you DIY enthusiasts out there to stay tuned to the Tenou Firesafe Insulation Company blog for more useful information.

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