Commercial roofing · Single-ply systems
TPO, PVC and EPDM are all single-ply roofing membranes, but they are not interchangeable. The right system depends on the building, roof deck, drainage, rooftop equipment, chemical exposure, attachment method, insulation strategy and maintenance plan.
TPO
TPO is a thermoplastic membrane with heat-welded seams. White and other reflective colors are common on commercial roofs. TPO can be mechanically attached or fully adhered depending on the assembly and design requirements.
PVC
PVC is also a thermoplastic membrane with heat-welded seams. Product-specific chemical and grease resistance can make PVC useful for restaurants, industrial facilities and other buildings where the roof may be exposed to contaminants. The exact product data sheet and manufacturer requirements should drive the selection.
EPDM
EPDM is a synthetic rubber membrane with a long history on low-slope roofs. Black EPDM is common, with other configurations available depending on manufacturer and system. Seams and details use system-specific adhesives, tapes and accessories rather than the heat-welding used with TPO and PVC.
Attachment method matters
Single-ply systems may be mechanically attached, adhered or installed in another approved assembly. The correct design depends on the deck, insulation, wind design, existing roof and manufacturer requirements.
Insulation and drainage are part of the roof system
The membrane is only the visible top layer. Commercial performance also depends on the roof deck, vapor-control strategy where applicable, insulation, cover board, drainage, flashings and penetrations.
Do not choose by membrane price alone
Project cost changes with tear-off or recover conditions, insulation thickness, tapered drainage, roof access, perimeter and penetration details, attachment requirements and the amount of existing damage. Use a roof-specific scope rather than a generic per-square-foot number.
Maintenance still matters
Even a properly installed single-ply roof should be inspected periodically and after major weather events. Drainage, seams, flashings, penetrations and rooftop equipment areas deserve particular attention.