Good tape. Used with 15mil vapor barrier and it does the job. Typical tape, hard to start if you don't have good fingernails and sometimes it would split when I tried to start but in general a great product that really seals the seams.

The foundation blocks under my house my house are over 60 years old. Even after brushing them with the spacial brush these tape wouldn't stick. The caulk i ordered just in case did work but I will need to buy lots more.

Works incredibly well. I plan to tape up a friend for Halloween.

I have been very pleased at the quality of the 12 Mil SilverBack™ vapor barrier and with the Waterproof Seam Tape. The 13'4" width has worked very well for sizing sheets to lay down between the concrete pillars, and even the manufactured seam at half this width has been a convenient guide for cutting smaller sizes to go up the end walls or on the pillars. I've never undertaken such a big task in such a big, dark, damp space. But I found that proper lighting and steady work in one area at a time led to success that grew until the whole project was done. I ended up with a dry, clean, all-white encapsulation and look forward to using my crawl space for storage now that a dehumidifier has been hooked up.

This seems to be a good, durable vapor barrier. Unfortunately, there were some holes in it from the shipper. I patched them with the seam tape, but it's unfortunate that there isn't a safer way to ship this stuff.