Polyvinyl-chloride roofing is made of PVC resin/plasticizer/stabilizers/fiber/fabric, is highly-recyclable, has been around for several decades, and has excellent water permeability resistance. It is nearly identical to TPO roofing in terms of installation and it can be mechanically fastened or fully adhered. PVC roofing has thicknesses ranging from 45-80 mils. It is relatively lightweight (45mils typically 0.25lbs/sf) and competes with the value and price point of TPO, considered by some to be less economical in terms of cost. PVC and TPO combined account for 40-55% of low-sloping roofs currently, depending on region. PVC roofing utilizes forced hot-air to seal the seams.
It is not uncommon for 1/4″ fiberglass sheathing to be utilized as a substrate on top of the roof deck or insulation as the plasticizers can leech into the rigid insulation below, making the PVC roofing material less elastic and brittle.
PVC is more recyclable than virtually any other low slope roofing material. ASTM D 5036 explains recommended attachment of fully adhered PVC systems.
ASTM D 5082 explains recommended attachment of mechanically fastened PVC roofing systems.
PVC roofing material is available in relatively large rolls allowing for fewer seams. White reflective material is the most commonly produced being considered a ‘cool roof’ exceeding energy standards and LEED credits. DUe to the lightweight nature, if local code allows, PVC roofs may be installed over existing roofing systems. Roof pipe boots for a PVC roof system are typically made of PVC as well and are prefabricated and installed by the roofer typically.