PVC & EPDM Roofing in Dallas–Fort Worth, TX

PVC and EPDM are the two flat-roof membranes owners most often ask us to compare with TPO. PVC is a white, heat-welded sheet that stands up to grease and chemicals, which is why it shows up over restaurant kitchens. EPDM is the black rubber roof found on many older offices, churches and warehouses around Dallas–Fort Worth. Different Roofing installs both, handles PVC roof repair and EPDM roof repair, and fixes the rubber roof leaks that older buildings are known for. Every job starts with a free inspection and a plain answer about what your roof needs.

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PVC vs. EPDM: Two Very Different Membranes

PVC (polyvinyl chloride) is a thermoplastic. Its seams are joined with a hot-air welder, so the overlapping edges melt into one continuous sheet. Plasticizers keep the sheet flexible, and a polyester scrim in the middle gives it strength. PVC roofing is usually installed in 50, 60 or 80 mil thicknesses, in white or light gray, which reflects much of the Texas sun.

EPDM (ethylene propylene diene monomer) is a synthetic rubber. It does not melt, so the seams are joined with primer and seam tape or adhesive instead of heat. EPDM roofing comes in very wide sheets, so a large roof has fewer seams across the field, and it is made in 45, 60 and 90 mil. Standard EPDM is black and absorbs heat; a white-on-black version is available where a cooler roof matters.

How a PVC Roof Is Installed

1. Inspection and core cuts. We measure the roof, count the layers already on it, check whether the insulation is dry, and look at what the rooftop equipment is venting onto the roof.
2. Prep. Wet insulation and damaged deck come out. A recover is only an option over a single dry roof, and old asphalt roofs need a separation layer because PVC should not sit directly on asphalt.
3. Insulation and cover board. Polyiso goes down with tapered panels that move water to the drains, then a firm cover board.
4. Membrane. The PVC is either mechanically fastened in the seam laps or fully adhered to the cover board.
5. Welding and probe testing. Each seam is welded and then probed along its full length.
6. Kitchen exhaust areas. Around exhaust fans we add walkway pads and extra membrane, and we recommend a grease containment unit at each fan so oil does not sit on the roof.
7. Flashings and edge metal. Walls, curbs, pipes and drains are flashed in PVC, and PVC-coated metal lets the edge and coping be welded to the field sheet.

How an EPDM Roof Is Installed

An EPDM roof needs the same groundwork: a sound deck, dry insulation and tapered panels toward the drains. The rubber then goes down one of three ways. Fully adhered EPDM is bonded to the cover board with adhesive across the whole sheet. Mechanically attached EPDM is held with plates and bars hidden in the laps. Some older ballasted EPDM roofs are simply loose-laid and held down with river rock. Seams are cleaned, primed and joined with factory seam tape, and every T-joint gets a cover patch. Walls, curbs and pipes are flashed with uncured EPDM that can be formed around corners.

How Long Do PVC and EPDM Roofs Last?

A well-installed PVC roof typically lasts about 20 to 30 years, and an EPDM roof about 25 to 30 years. The two age differently. PVC slowly loses plasticizer, so an old sheet gets stiffer and more brittle, especially on sections that bake in full sun. EPDM rarely wears out in the middle of the sheet; its weak points are the taped seams, the flashings and the places where the rubber has shrunk away from walls. Clean drains, walkway pads and an inspection every spring and fall push either roof toward the long end of its range.

PVC Roofing Pros and Cons

Pros:

• Heat-welded seams that become one continuous sheet
• Resists grease, oils and many chemicals, so it is the usual pick over restaurant kitchens
• White, reflective surface that helps with summer cooling
• Can be welded to PVC-coated edge metal for a clean perimeter

Cons:

• Usually costs more than TPO for the same roof
• Gets stiffer with age as plasticizers leave the sheet
• Cannot touch asphalt or EPDM directly, so recovers need a separation layer
• Late in its life it can be hard to weld new material to

EPDM Roofing Pros and Cons

Pros:

• Decades of track record on commercial buildings
• Stays flexible through summer heat and winter freezes
• Wide sheets mean fewer seams
• Easy to patch while the rubber is still in good shape

Cons:

• Black EPDM absorbs heat unless it is white or coated
• Taped seams are weaker than welded seams and are the most common leak point
• Shrinks over time and can pull flashings tight at walls
• Does not hold up well to grease

Rubber Roof Repair and EPDM Roof Repair

Most rubber roof repair calls trace back to seams. On older EPDM, the seam adhesive dries out and the lap starts to open, often at a T-joint or where water ponds. Weathered rubber has to be scrubbed clean and primed or a patch will not stick, so we take the prep seriously, then install new seam tape or a cured cover strip over the open lap. Punctures get a primed patch that runs several inches past the damage in every direction. Where the membrane has shrunk and is pulling the wall flashing tight, we release the tension and add new flashing so the corner is not carrying the strain. On ballasted roofs, we move the rock, make the repair and put the ballast back.

PVC Roof Repair

PVC roof repair works much like TPO repair: clean, prepare and heat-weld a new piece of PVC over the damage. The difference is what we often find on restaurants. Grease that sits on a roof for years breaks down membranes that are not made for it, so on a PVC roof over a kitchen we check every exhaust fan, look at whether grease containment is doing its job, and clean before welding. Very old PVC that has lost much of its plasticizer may not take a weld well, so we make a test weld first and tell you if the roof is closer to replacement than repair.

Repair, Replace or Coat a PVC or EPDM Roof?

Repair when the problems are local: a few open seams, a puncture or a failed pipe boot. A coating is often a good fit for EPDM that is still well attached and dry underneath but has seams starting to go all over the roof; a compatible roof coating system over primed rubber seals the seams and turns a black roof white. PVC is coated less often because adhesion can be tricky, so we test adhesion before recommending it. Replace the roof when the insulation is wet across large areas, the membrane is brittle or cracking, or the repair list keeps growing every season. Test cores taken during the inspection tell us which way to go.

Signs of PVC or EPDM Roof Damage

• EPDM seams curling up or showing a gap at the lap edge
• Rubber stretched tight across inside corners at walls, curbs and edges
• Cracking, crazing or brittle spots on older PVC
• Blisters or wrinkles that move when you step on them
• Cuts and punctures along service paths and near rooftop units
• Stains or softened membrane around kitchen exhaust fans
• Water that sits on the roof more than 48 hours after rain
• Stained ceiling tiles or a musty smell inside the building

Hail and Storm Damage on PVC and EPDM Roofs

Hail damage on these roofs is easy to underestimate. EPDM is flexible enough that hailstones often bounce off the rubber, but the impacts can still crack the cover board or crush the insulation underneath, which shows up later as soft spots and stress on the seams. Older, stiffer PVC can fracture where large hail hits it. Wind is the other North Texas threat: once edge metal lifts, wind gets under the membrane and can peel back a whole section. After a storm we walk every section, press-test soft areas, cut cores where needed, and photograph the field of the roof, the seams, the edge metal and the dents on vents and HVAC units. Then we meet your insurance adjuster on the roof and walk it together. The adjuster makes the coverage decision; our part is making sure the damage is fully documented.

What Owners Should Expect

We schedule the loud work, like tearing off the old roof, around your business hours, whether that means a restaurant's lunch rush or a church's Sunday schedule. PVC welding makes very little odor. EPDM adhesives and primers do smell while they cure, so we coordinate rooftop air intakes with your building manager or HVAC contractor before we start. You get a written proposal that spells out the membrane, thickness, attachment method and insulation, updates while we are on the roof, and a final walk with photos when the work is done. Every day ends with the roof watertight and the ground swept for fasteners.

More Commercial Roofing Services

PVC and EPDM are two of the systems we install. Compare them with TPO roofing and modified bitumen and built-up roofing, learn about roof coatings, commercial metal roofing and commercial roof repair, or go back to our commercial roofing overview. To schedule a free PVC or EPDM roof inspection anywhere in Dallas–Fort Worth, call (682) 400-6163.

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