We had to remove a few pins for my drilling quite deep enough, drill again, and reinstall.

TIP: We rented a hammer drill to make this happen and it worked amazing compared to using a motar bit in our regular drill. Such a time saver!

BONUS TIP: If you have space and a helper run a shopvac and place the tip about an inch below the drill spot for instant cleanup.

 

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

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!

I've used them to attach the 20mil membrane to fondations sprayed with polyurethane and to my surprise, they worked great. Because the surface is so irregular, I would have needed twice as much as I thought. Couldn't find something as good at the store.

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!