depending upon the mil thickness, I use X amount of pins. I research everything and theses wont degrade for about 100 years. They fit a 1/4" drill hole perfectly and when i drill into mortar, I might add some Lock-Tite. They're perfect

After shopping locally and finding noting but thin plastic sheeting, I found Crawl Space Repair. Everything about my Vapor Barrier is amazing now. This was a great DIY project once I ordered the right products. Thank you for helping me keep my family safe...

The 12 Mil Crawl Space Vapor Barrier, GuardianLiner™ is the ideal covering for my dirt floor crawl space. It arrived on time, it is easy to work with and it is both economical and tough and is of better than average construction. I plan on buying more when it is time to finish encapsulating my crawl space.

Good products – helpful and knowledgeable service. Your company is a pleasure to work with.

We have recently used the 42 5100 under our 20 MIL liner and I will have to say it's a must. We will be using this product under our crawlspace liners from here on out.