Definitely a great purchase. They worked perfectly. I just used a masonry drill bit with a regular drill and went into the mortar. I used these and adhesive for a good seal. I really love this site! It is informative and easy to navigate. You cannot beat this company for crawl space supplies!

The cement block in my crawl space was a little damp making the double stick tape not the best option. So after speaking with Larry he recommended going with the pins to secure the 12 mil and then the polyurethane caulk just above it to make a nice waterproof seal. As usual, Larry was right on the money and it worked great. I recommend getting one more bag of pins (or a tube of poly) than you think. It's better than having to reorder, pay shipping.and more importantly, having to stop your progress.

Don't try the installation without the pins! They work great and really save a lot of wasted effort. While the double sided tape is great, the weight of the barrier is enough to pull it down. Working in a low crawl space, I placed the tape around the perimeter with the outer paper intact. I then worked a few feet at a time with the tape and pins. Worked well for me!

Easy to install once hole is drilled, just lightly tap in or they will bend over and snap off

I found in my damp crawlspace where my home is built on footings so the barrier had to be put directly on the inside of the bricks. The tape didn't stick to the moist brick. I've had to depend on the pins and caulking to seal the barrier to the interior crawlspace wall. It adhered well to the cement blocks though.