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ASC APP 4.5 CW Granulated Heat-Welded Cap Sheet 39.625" x 32.25' Cool White
Regular price $113.00Orders start at $399 — combine any items to reach the minimum. Learn more
ASC APP 4.5 CW Granulated Heat-Welded APP Modified Bitumen Cap Sheet, 39.625 in. x 32.25 ft., Cool White, 1 Square Roll
ASC APP 4.5 CW is a premium Cool White granulated APP modified bitumen cap sheet for heat-welded, multi-ply low-slope roofing. One roll covers 1 square (100 sq ft) at 39.625 in. x 32.25 ft. and approximately 110 lb. It installs over an ASC APP 2.0 Torch Base Sheet (sold separately) on new construction and reroofing jobs.
Key Features:
- Cool White granules: Highly reflective roofing granules are engineered for high reflectivity and optimal embedment in the APP modified bitumen sheet.
- Polyester reinforcement: A high-performance, stress-resistant polyester mat provides flexibility, dimensional stability and excellent tear and puncture resistance.
- Heat-weld application: The underside has a factory-applied burn-off film for heat-weld (torch) application; do not use cold adhesives or hot asphalt.
- Multi-ply cap sheet: Designed as the cap sheet in APP multi-ply roofing systems over various substrates.
- Flashings too: Suitable for roof system flashings including wall treatments, base flashings and field flashings.
- Cool roof ratings: Solar reflectance 0.84 initial / 0.74 aged; thermal emittance 0.88 initial / 0.89 aged (CRRC rated, Product ID #1202-0011a).
- Tested properties: ASTM D5147 properties include peak load min 50 lbf/in., 23% elongation and 70 lbf tear strength.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | ASC |
| Manufacturer model | ASCAPP45CW |
| Sell unit | 1 roll, 1 square (100 sq ft) |
| Product type | Granulated APP modified bitumen cap sheet |
| Chemistry / base | Atactic Polypropylene (APP) modified bitumen with polyester mat reinforcement |
| Color | Cool White |
| Roll size / coverage | 1 square roll (100 sq ft), 39.625 in. wide x 32.25 ft. long |
| Length | 32.25 ft. |
| Width | 39.625 in. |
| Application method | Heat-weld (torch) |
| Thickness | 4.5 (series designation) |
| Elongation | 23% at peak load at 73°F |
| Tensile strength | Peak load at 73°F min 50 lbf/in. (8.8 kN/m), ASTM D5147 |
| Tear strength | 70 lbf (311 N) at 73°F, ASTM D5147 |
| Low temperature flexibility | 32°F (0°C) max |
| Granule embedment | 2 g |
| Reflectivity / SRI | Solar reflectance 0.84 initial / 0.74 aged; thermal emittance 0.88 initial / 0.89 aged (CRRC, Rated Product ID #1202-0011a) |
| Approx weight | 110 lbs. per roll |
| Compatible substrates | Low-slope roof decks for new construction and reroofing; over ASC APP 2.0 Torch Base Sheet |
Coverage & How Much You Need:
One roll covers 1 square (100 sq ft) at 39.625 in. x 32.25 ft. Side laps use a 2 in. overlap and end laps 4 in., installed over a base ply with a minimum 6 in. offset between base and membrane laps, so order slightly more than the net roof area to account for laps and flashing details.
Fit and Compatibility:
Designed as the cap sheet in ASC APP multi-ply roofing systems over ASC APP 2.0 Torch Base Sheet (sold separately), lapped 2 in. on sides and 4 in. on ends. Do not apply over shingles or any granulated surface, and do not use cold adhesives or hot asphalt with this sheet.
Frequently Asked Questions (FAQ):
Q: What is included with this order?
A: One roll of ASC APP 4.5 CW Cool White granulated cap sheet, 1 square (39.625 in. x 32.25 ft.), approximately 110 lb.
Q: How much area does one roll cover?
A: One roll covers approximately 1 square (100 sq ft) of roof; allow extra material for 2 in. side laps, 4 in. end laps and flashing details.
Q: How is it installed?
A: It is torch heat-welded over a mechanically fastened or mopped ASC APP 2.0 Torch Base Sheet, with laps inspected for a minimum 3/8 in. flow of modified compound; details and flashings are torch applied.
Q: Can I use hot asphalt or cold adhesive?
A: No; ASC APP 4.5 CW is designed for heat-weld application only and should not be installed with cold adhesives or hot asphalt.
Q: Can it go over existing shingles?
A: No; do not apply over shingles or any granulated surface, and remove all prior roofing material down to a clean substrate when reroofing.
Q: What physical properties does it have?
A: Per ASTM D5147: peak load min 50 lbf/in., 23% elongation at peak load, 70 lbf tear strength, and 32°F low-temperature flexibility.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Choose ASC APP 4.5 CW when you need a reflective Cool White cap sheet for a torch-applied APP multi-ply system on a low-slope deck, including base and field flashings. Verify the substrate is firm, smooth, dry and positively drained, and stagger the cap sheet at least 3 ft over the base ply laps. This is a professional torch-applied product; in cold weather handle rolls carefully to avoid damage.
Torch application is a fire hazard: only properly trained roofing professionals should install this sheet, keep an ABC-approved fire extinguisher at each torch, and maintain a fire watch for at least 60 minutes after the last heat-welded work of the day.
Order the ASC APP 4.5 CW Cool White heat-welded cap sheet roll for your next APP multi-ply roofing project.
Product Documents:
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