Felt Crawl Space Underlayment
This special felt is desigend to protect the vapor barrier from getting punctures in it due to sharp rocks. You
need to remove all rocks before you put the liner in, but sometimes you can get them all. The felt also helps to
remove Radon gas and other odors used in combination with the sump pump and mitigation fan.
For detailed video instructions I would recommend that you go to the Crawl Space Repair
channel on YouTube"
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