Not as stiff as I was expecting, and that is a good thing. Pretty easy to work with.

This is three times heavier than anything I can find locally. I precut into sheets in the yard, I think dealing with the roll under the house would be quite hard. It's a bit stiff to get into the crawl space and unfold. As with another reviewer, I'm glad that day is behind me. I was sooo sore! It cuts like plastic with sizzors. The rocks and bits of broken concrete left from construction only put dents in this product, no holes. I am impressed with its strength.

They work great, i wish they made some longer though so you can fit them through the foam insulation as well.

worked great!

Tape applied easily per easy instructions with immediate strong adherence. No separation of seams is apparent at close inspection several months later.