What's the difference between classAcustoms TPO roofing and 2 ply EPDM Rubber Roof? Here's some major benefits to switching over to TPO roofing. **ITEM SHIPS folded in a box - it is recommend that you remove it from the box as soon as you receive it. Lay it flat and allow it to "relax" for several hours before installing, this will allow the temporary creases that may have been caused by folding to come out as the item "rests". ** *Lightweight - get better gas mileage (.165lbs/sq ft. compared to 2 ply EPDM at .29 lbs/sq ft.) *Does not chalk (won't turn side of unit gray) *Stronger - won't puncture as easily like 2 ply EPDM *Can be easily repaired *Stretches easier so you can get a perfect tight fit *Better traction with a non-skid surface *Color is same throughout substrate *Will not shrink or crack (100% solids sealant) *.028 Thick