A complete roof protection system in one roll.
ACC is a self-adhered, six-layer weathering and anti-corrosion membrane for metal roofs. It reflects heat, blocks water and resists corrosion — on metal, concrete and masonry roofs, gutters, flashings and penetrations.
A weathering membrane, not a coating.
Coatings depend on mil thickness applied on the day, cure conditions and recoat cycles. ACC arrives as a factory-made laminate with consistent thickness and a continuous butyl bond — so what you specify is what goes on the roof.
- Peel-and-stick application — no torches, kettles or spray rigs
- Installs over the existing metal roof — no tear-off
- Treats the whole roof or just the problem details: seams, fasteners, gutters, ridges and penetrations
- Reflective, easy-clean surface with sound dampening on metal roofs
Logistics warehouse roof, China.
Inside the six-layer laminate
- Anti-corrosion (ACC) coatingThe exposed weathering face. Resists UV, acid rain and salt spray, and stays clean with a water contact angle over 90°.
- Pure aluminum foilDelivers the membrane’s high solar reflectance — the cool-roof performance layer.
- PET filmDimensional stability and tear resistance across the laminate.
- PE tie layerBonds the PET film to the non-woven reinforcement beneath.
- PET non-wovenTensile reinforcement that carries the laminate.
- Self-adhesive butyl13–15 mil high-tack butyl — a continuous, self-sealing bond that stays stable from −22 °F to 176 °F. Protected by a release film until installation.
Product specifications
Manufacturer specifications for ACC Weathering Membrane.1 Full data sheet available on request.
| Property | Value | Notes |
|---|---|---|
| Total thickness | ~22–25 mil | Including 13–15 mil butyl adhesive |
| Butyl adhesive | 13–15 mil | High-performance, self-adhered |
| Laminate weight | 159 g/m² ±10% | ISO 536 |
| Laminate thickness | 240 µm ±10% | In-house method |
| Color / finish | Silver, reflective | |
| Service temperature | −22 °F to 176 °F | −30 °C to 80 °C |
| Low-temperature flexibility | −4 °F, no cracks | −20 °C |
| Design life | 25 years | Manufacturer estimate |
| Shelf life | 2 years | Stored cool and dry |
| Packaging | Individually wrapped rolls | LDPE-lined |
| Product code | WF501C-BU |
| Laminate test | Method | Result |
|---|---|---|
| Solar reflectance | ASTM C1549 | ≥ 0.80 (spec) |
| Tensile strength before ageing (MD / CD) | ISO 9073-3 | ≥ 325 / ≥ 300 N/50 mm |
| Tensile strength after ageing (MD / CD) | ISO 9073-3 | ≥ 80% of before-ageing value |
| Tear resistance | ISO 9073-4 | ≥ 25 / ≥ 35 N |
| Nail shank tear | BS EN 12310-1 | ≥ 45 / ≥ 50 N |
| Ageing, 70 °C / 90% RH, 28 days | ISO 22097 | No corrosion |
| Acid rain corrosion, pH 3.15 | ASTM D7356 | No corrosion |
| Accelerated weathering, 5,000 h QUV | ASTM G154 | No corrosion, chalking or delamination |
Accessories
ACC Multi-Surface Primer
One-pack primer for aluminum, galvanized, stainless and mild steel, fiberglass, wood and previously painted surfaces. Applied before the membrane.
ACC Flashing Tape
For sealing cracks, holes and rivets and for detailing ridges, gutters, skylights, parapets and penetrations.
Ask us about roll sizes, packaging and current U.S. availability.
Request documents
See it. Peel it. Test it on your roof.
Request a free ACC sample and technical data pack — shipped to your office or job site.
- Manufacturer data — San Miguel Yamamura Woven Products, ACC WF501C-BU specification sheet and product manual. Test methods as stated. U.S. third-party listings are in progress.
- Independent U.S. laboratory testing (ACE Laboratories, Ravenna, Ohio, July 2026) to ASTM C1549 and ASTM C1371 on two production batches: initial solar reflectance 0.83–0.84, SRI 92–95. These are initial lab values, not a Cool Roof Rating Council (CRRC) rating. CRRC rating is in progress.