TPO / PVC restoration
Thermoplastic that still holds a seam is a restoration, not a tear-off. Clean it, seal the laps and put a fluid-applied membrane over the whole field.
- No tear-offBuilding stays open
- Pr305Primer required under either topcoat
What happens to TPO and PVC
Thermoplastic membranes lose plasticizer and top-ply thickness as they age. The sheet chalks, goes brittle at the laps and starts to crack at the seams and around penetrations long before the field membrane fails.
That aging profile is what makes single-ply a good restoration candidate. The membrane is still a continuous, adhered substrate. A restoration system renews the weathering surface and the seams without touching the insulation or the deck.
A coating job when
- Seams and laps intact or repairable
- Insulation dry on a moisture scan
- Sheet adhered or fastened, no billowing
- Ponding water is the main complaint
Not a coating job when
- Wet insulation across more than a quarter of the roof
- Shrinkage pulling flashings off walls and curbs
- Membrane too thin to hold an adhesion pull test
Not sure? Send photos and a core cut. A rep will call it.
The build-up, in order.
For roofs that pond or drain slowly. Pr305 goes down first, then Si750 over the primed sheet.For roofs with positive drainage where cool-roof reflectivity and cost per square matter most.
Clean & prep
Scrub with Pr325 cleaner diluted 1:4, keep it wet for 15 minutes, then power wash at 2,000 psi or more and rinse to clean water. Let it dry. Replace wet insulation flagged on the moisture scan. Pull-test a 2 × 2 ft patch before you order.
Prime
Pr305 blocks plasticizer migration on PVC and bonds aged TPO — 0.5 gal per 100 ft² on TPO, 1 gal per 100 ft² on PVC. Required under Si750 on TPO and PVC.
Pr305 Single-Ply Primer1 gal / 200 ft²Seams & details
Brush-grade mastic on every lap, curb, drain and penetration. Embed polyester fabric at splits and open seams.
Si790 Silicone Mastic1 gal / 60 lin ftWalkways
Around units and along service paths, set into wet topcoat and clipped at the corners.
GripTite Walkway Pad Walkway ProtectionSized to layout
Clean & prep
Scrub with Pr325 cleaner diluted 1:4, keep it wet for 15 minutes, then power wash at 2,000 psi or more and rinse to clean water. Let it dry. Replace wet insulation flagged on the moisture scan. Pull-test a 2 × 2 ft patch before you order.
Prime
Plasticizer-blocking acrylic primer over aged single-ply. Required on TPO and PVC; PVC takes 1 gal per 100 ft².
Pr305 Single-Ply Primer1 gal / 200 ft²Seams & details
Fibered mastic on laps, curbs, drains and penetrations. Fabric at splits.
Ac595 Acrylic Mastic1 gal / 40 lin ftBase coat
First full coat. Let it cure 24 hours before the topcoat.
Ac510 Acrylic Roof Coating8.8 dry mils per gal / 100 ft²Topcoat
Second full coat, applied at right angles to the base coat.
Ac550 Acrylic Roof Coating8.5 dry mils per gal / 100 ft²Walkways
Around units and along service paths, set into wet topcoat and clipped at the corners.
GripTite Walkway Pad Walkway ProtectionSized to layout
- 04 · TopcoatSi750
- 03 · Seams & detailsSi790
- 02 · PrimePr305
- Substrate · Aged TPO / PVC membrane
Thickness not to scale. Optional steps appear here when switched on in the estimator below.
Rough quantities for this roof.
Enter the roof and get gallons and containers for the route above. It is a planning number, not a bill of materials — your rep confirms coverage before anything ships.
Estimate
25,000 ft² · 30 dry mils · silicone- 02Pr305 Single-Ply PrimerPrime · 1 gal / 200 ft²138 gal28 × 5-gal pails
- 03Si790 Silicone MasticSeams & details · 2,500 lin ft · 10 penetrations49 gal25 × 2-gal pails
- 04Si750 Silicone Roof CoatingTopcoat · 30 dry mils536 gal9 × 55-gal drums + 9 × 5-gal pails
- 05GripTite Walkway Pad Walkway ProtectionWalkways · Rolls and clipsSized to the layout — your rep quotes it
Liquid product, all steps723 gal
- Smooth surface: no texture allowance
- 10% overage on every liquid product
- Quantities rounded up to whole gallons, then to full containers
- Pr305 at 1 gal / 200 ft² — TDS rate for aged TPO
- Si790 at 1 gal / 60 lin ft of seam, 0.2 gal per penetration — rule of thumb
- Si750: 15.4 dry mils per gal / 100 ft² — TDS; 30 mils this coat
Rough estimate for planning. Actual coverage depends on surface porosity, texture, application method and verified mil thickness. Confirm with the TDS and your rep before ordering.
Estimate
25,000 ft² · 32 dry mils · acrylic- 02Pr305 Single-Ply PrimerPrime · 1 gal / 200 ft²138 gal28 × 5-gal pails
- 03Ac595 Acrylic MasticSeams & details · 2,500 lin ft · 10 penetrations73 gal15 × 5-gal pails
- 04Ac510 Acrylic Roof CoatingBase coat · 16 dry mils500 gal9 × 55-gal drums + 1 × 5-gal pail
- 05Ac550 Acrylic Roof CoatingTopcoat · 16 dry mils518 gal9 × 55-gal drums + 5 × 5-gal pails
- 06GripTite Walkway Pad Walkway ProtectionWalkways · Rolls and clipsSized to the layout — your rep quotes it
Liquid product, all steps1,229 gal
- Smooth surface: no texture allowance
- 10% overage on every liquid product
- Quantities rounded up to whole gallons, then to full containers
- Pr305 at 1 gal / 200 ft² — TDS rate for aged TPO
- Ac595 at 1 gal / 40 lin ft of seam, 0.3 gal per penetration — rule of thumb
- Ac510: 8.8 dry mils per gal / 100 ft² — SESCO build-up rate (the TDS states 9); 16 mils this coat
- Ac550: 8.5 dry mils per gal / 100 ft² — from 53% volume solids (the TDS states no dry-mil yield); 16 mils this coat
Rough estimate for planning. Actual coverage depends on surface porosity, texture, application method and verified mil thickness. Confirm with the TDS and your rep before ordering.
Case studies.
Case studies are on the way.
The data sheets for this route.
Published TDS and SDS for the silicone route. Ask your rep for any sheet not listed; the spec letter comes from your rep.Published TDS and SDS for the acrylic route. Ask your rep for any sheet not listed; the spec letter comes from your rep.
Order through your rep.
Reps confirm coverage and write the spec letter. Send the estimate, or call 1-812-776-6727.