I needed to renovate a widow's walk porch on a turn-of-the-previous-century Victorian and this rubber worked perfectly. Tore it all apart, covered the original tin & tar "roof" with plywood at a 3° slope, laid this out and used a water-based acrylic cement to glue it down. The most inconvenient part was the weight--this is heavy rubber. But it rolled out very smoothly (be sure to let it "rest" for a day or so to get any creases from shipping out). Used contact cement around the edges and it's been leak-proof through a half dozen thunderstorms thus far. I got the 60-mil as I plan to build a wooden deck on top of it to keep foot traffic off the EPDM. It's thicker than I was anticipating and I imagine 40 would work great for anything that isn't going to have people on it.

Worked fantastic. Set out a few hours in the sun and all fold seams laid out. Put under a roof deck I was covering with Trex. Trex clip screws went right through. No leaks underneath so far. Was very pleased with the product.

Firestone Rubberguard 60 Mil EPDM Roofing Rubber is an excellent product. I purchased this for applying near my foundation of my home to eliminate water coming into my homes basement. I first put recycled asphalt near the foundation, coming out 6' with a slope of 1" every foot. Then applied the EPDM Roofing Rubber, and some landscape rocks on top. This appears to have solved the problem! Excellent product!

As expected

Very solid material .. I place it on top of the deck to keep the deck dry...