Single-ply membranes mostly include EPDM (rubber – black or white), PVC (plastic based – white, grey, tan or sometimes other colors) or TPO (plastic based – white, gray, tan or sometimes other colors). There is a much larger base of installed EPDM systems than TPO or PVC, although the ratio is changing. Single-ply membranes can basically be installed in 3 ways:
- Fully adhered (glued) to insulation or directly to the deck.
- Mechanically fastened with plates/bars through the insulation/roof deck.
- Ballasted (weighed down with 1″-2″ dia. stones).