Low slope EPDM or TPO?
I am going to have to reroof 3 squares of low slope roof on my home.
My plan is to fit a cool roof to keep cool in summer, plus 0.5″ deck and two layers of lapped 2″ of polyiso under for winter warmth.
I have a choice of white EPDM, or white TPO.
Also there is light gray TPO and that would match the smoke gray EcoStar Majestic Slate (in our Product Guide) on the tie in roof which is tempting. But the light gray drops the reflectivity from .75 for white to .45. I’m on Long Island the heat isn’t that strong, but no point heating the roof needlessly.
I see there are two TPO membranes in the product guide (one Dow one Firestone).
1) What’s the plus and minuses of EPDM vs TPO.
2) For TPO peel and stick, or applied adhesive?
TPO is more slippery – bad for falling, good for cleaning.
TPO is available in light gray if I go for looks (but it is not visible from ground level).
I see a lot of comparisons being made around the net, but usually by those with a vested interest.