What Kind of Roof Does a Restaurant Need? (Commercial Guide)

Why Restaurant Roofs Are a Different Problem

Walk on the roof of a restaurant that's been running five years with a standard TPO membrane and you'll find a ring of degraded, discolored material around every exhaust fan. That's grease — aerosolized cooking oil that exits the kitchen exhaust and condenses on the roof surface. We see this all the time. TPO is a great membrane in most commercial situations, but it has no chemical resistance to animal and vegetable fats. That grease eats away at TPO flexibility and seam integrity years ahead of schedule.

And restaurants punch more holes through their roofs than almost any other building type — kitchen exhaust fans, makeup air units, HVAC condensing units, refrigeration condenser lines, gas pipe penetrations, electrical conduit, plumbing vents. Jonathan walked a 5,000 sqft restaurant roof in Addison last year and counted 22 separate penetrations. Every one of those is a potential leak. When flashing quality is the difference between a 15-year roof and a 7-year roof, that detail matters.

PVC — The Right Call for Food Service Roofs

Here's the deal: PVC (polyvinyl chloride) single-ply membrane is what you want on a restaurant. Its chemical resistance to oils, greases, and fats is baked into the polymer chemistry — it doesn't degrade when exposed to the stuff that destroys TPO in a kitchen exhaust environment. Most major membrane manufacturers recommend PVC over TPO specifically for food service applications.

Cost in DFW runs $7–10 per square foot installed versus $5.50–8.50 for TPO. But PVC delivers 25–35 years in restaurant environments compared to 12–18 for TPO with constant grease exposure. Run the math: two TPO roofs over 30 years, or one PVC roof. PVC wins on lifetime cost, and by a lot.

We install Carlisle SynTec and Firestone PVC systems — both with manufacturer-backed warranties up to 30 years. Carlisle Sure-Flex PVC is one of the most-specified membranes for restaurant and food processing facilities in Texas. As a Carlisle SynTec Authorized Installer, JRH warranties are backed by the manufacturer directly, not just by us.

Kitchen Exhaust Penetrations — This Is Where It Fails

Every kitchen exhaust fan goes through a curb — a raised platform that lifts the fan unit above the membrane so water can't get under it. The flashing at the base of that curb is where problems start. Standard practice wraps the curb with membrane material and terminates it with a bar and sealant. When that sealant fails — typically 5–7 years — water gets behind the membrane every time it rains.

We specify grease-resistant PVC flashing material for every restaurant exhaust curb. Not EPDM, not standard TPO — material that's chemically compatible with what it's going to be exposed to. Curb heights get verified against NFPA 96 requirements (minimum 10 inches above roof surface for most exhaust systems). Termination bars are mechanically fastened at 6-inch intervals, sealed with elastomeric caulk rated for grease exposure. That's how you do it right.

Rooftop HVAC — Weight, Access, and Sequencing

A full-service restaurant can have 8–15 rooftop HVAC units, each one weighing 400–2,000 lbs. They need structural curbs, and the membrane has to handle maintenance foot traffic without getting punctured. We put walkway pads — bonded pavers or rubber walkway systems — from the roof hatch to each unit, with reinforced bonded strips at the equipment curbs.

When you replace a restaurant roof, the sequence is everything. HVAC units have to come off — either set aside or held on temporary platforms — while the membrane gets torn off and replaced. We coordinate directly with the mechanical contractor to schedule HVAC disconnects and reconnects around membrane installation. The goal is keeping refrigeration offline for the minimum possible time.

Fire Code on Texas Restaurant Roofs

Texas commercial buildings including restaurants need Class A fire-rated roofing assemblies under the International Building Code. Both PVC and TPO hit Class A when installed in code-compliant assemblies. The restaurant-specific piece is NFPA 96 — Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations — which governs how exhaust systems discharge and what clearances they maintain from combustible materials.

When a roofing project moves or modifies exhaust curb positions, those clearances have to be re-verified. We provide the documentation for your building permit and final inspection showing NFPA 96 compliance. Not every roofer handles that piece — we do, because skipping it creates inspection problems.

Keeping Your Restaurant Open During Re-Roofing

Most restaurant re-roofing can be sequenced so you don't have to close. We work one section at a time, keeping completed sections weatherproofed before moving. Kitchen exhaust fans usually stay operational during membrane work on distant sections. For seven-day-a-week operations, we schedule the disruptive parts — exhaust fan disconnection and reconnection — during your weekly closure window or before service starts in the morning.

We do drone inspections before the project starts to map every penetration location, equipment position, and existing damage point. That means the project schedule is built on reality, not on what we discover during demolition.