Interactive 3D System Guide
PVC Roofing System — Explore Every Layer in Interactive 3D
This is the PVC assembly Coastal Roofing of Georgia installs on restaurants, cold storage, hospitals, and food-service buildings — anywhere a roof faces grease, animal fats, oils, or chemical exposure that would destroy a standard membrane. Rotate it, explode the layers, and press Play Install to watch the full installation.
PVC costs more than TPO for one reason: chemistry. It shrugs off the animal fats and hydrocarbons that void TPO warranties around kitchen exhaust, and its wider weld-temperature window makes field seams more forgiving to install perfectly.
Drag to rotate · Scroll to zoom · Press ▶ Play Install to watch the system installed step by step · Toggle Explode View to separate the layers
Bottom to Top
The Assembly, Layer by Layer
Structural Steel Deck
20-gauge corrugated steel
Same structural deck as TPO assemblies — concrete and wood decks also supported.
Vapor Retarder
Polyethylene film, 40-mil
Critical on cold-storage and refrigerated buildings — interior moisture migration is what kills those roof assemblies.
Polyiso Insulation, Layer 1
Polyisocyanurate rigid foam, 2" / R-13
Cold-storage and FM Global-rated assemblies typically run thicker insulation for condensation control.
Polyiso Insulation, Layer 2
Polyisocyanurate rigid foam, 2" / R-13
Offset joints, total R-26 — exceeds Climate Zone 3A code minimum.
Cover Board
Glass-mat gypsum, 1/4"
Required by most PVC manufacturer warranties — protects against fastener pull-through and rooftop traffic.
60-Mil PVC Membrane
Reinforced polyvinyl chloride
Chemically resistant to animal fats, vegetable oils, hydrocarbons, and most industrial chemicals. 0.80+ solar reflectance — ENERGY STAR qualifying.
The Same Sequence Our Crews Follow
How It's Installed — Step by Step
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1
Existing building & structural deck. Existing restaurant or food-service building — parapets in place, kitchen-exhaust unit craned aside.
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2
Vapor retarder. Polyethylene layer first — essential on cold-storage and refrigerated buildings.
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3
Polyiso insulation — layer 1. First rigid polyiso layer laid in courses.
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4
Polyiso insulation — layer 2 + plate fasteners. Second layer with offset joints, plate-fastened through to the deck.
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5
Cover board. Glass-mat gypsum covers insulation and fasteners.
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6
Base PVC sheet rolled out. Chemical-resistant PVC sheet rolled across the cover board.
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7
Seam plates installed. Galvanized disc plates along the sheet edge — tighter spacing than standard TPO on these higher-exposure roofs.
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8
Top PVC sheet overlapped. Adjacent sheet covers the plate row plus 6 inches.
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9
Heat-welded seam. Hot-air welder fuses the sheets into one monolithic membrane — PVC's wide weld window makes a perfect weld easier to hit.
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10
HVAC curb flashing. PVC wraps up each curb side and over the top — the highest-value detail on a restaurant roof, where grease drips for 20+ years.
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11
Kitchen-exhaust unit set back. Unit craned back onto the fully flashed curb and reconnected.
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12
Roof drain installed. Clamping ring compresses a PVC target sheet into the drain bowl.
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13
Pipe penetration boot. Pre-formed PVC boot heat-welded to the field, stainless clamp at the pipe.
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14
Parapet wall flashing + coping. PVC up the wall, termination bar, metal coping cap.
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15
Edge metal + final inspection. Perimeter drip edge; every weld probe-tested before handoff.
Press ▶ Play Install in the 3D model above to watch every one of these steps animate in order.
Common Questions
Why install PVC instead of TPO?
PVC is chemically resistant to animal fats, vegetable oils, and hydrocarbons. Continuous grease exposure around kitchen exhaust softens TPO and voids most TPO warranties in the contaminant zone — PVC is built for exactly that environment.
Is PVC worth the premium over TPO?
On a restaurant, cold-storage, or food-processing roof, yes — the membrane is the difference between a 20-year roof and premature failure around every grease vent. On a clean warehouse rooftop, TPO is usually the better value.
How are PVC seams made?
Adjacent sheets are heat-welded with hot air into one continuous piece of plastic. There is no adhesive to age — the seam is as strong as the membrane itself, and PVC's wide weld-temperature window makes field welds very forgiving.
What thickness PVC do you install?
60-mil reinforced PVC is our standard spec. Premium 80-mil is available for 30-year warranty assemblies and cold-storage or FM Global-rated projects.
Ready When You Are
See it on your building.
Free inspection, straight answers, and a spec matched to your building — not a one-size-fits-all pitch.