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Johns Manville DynaFlex SBS Mineral-Surfaced Flashing Sheet, White 36" x 25'
Regular price $140.00Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville DynaFlex SBS Mineral-Surfaced Flashing Sheet, White 36" x 25'
The JM DynaFlex SBS Mineral-Surfaced Flashing Sheet is a white, ceramic-granule-surfaced, composite-reinforced cap sheet membrane for multi-ply roofing systems, supplied 36 in. x 25 ft per roll. One roll per order (EA). Its SBS rubber-asphalt blend accommodates roof expansion and contraction and meets or exceeds ASTM D 6221, Type I.
Key Features:
- Flexible SBS blend: High-quality SBS rubber and asphalt blend lends elasticity and handles continual roof expansion and contraction.
- Ceramic-coated granules: Ceramic-coated roofing granules are engineered for optimal embedment and excellent long-term adhesion.
- Hybrid reinforcement: Fiber glass/polyester mat combines polyester tensile strength and puncture resistance with fiber glass dimensional stability.
- Flashing and cap use: Used as a composite-reinforced cap sheet membrane in a variety of multi-ply roofing systems.
- ASTM compliance: Meets or exceeds the criteria for ASTM D 6221, Type I.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 roll, 36 in. x 25 ft |
| Product line | JM DynaFlex SBS |
| Available colors | White |
| Dimensions | 36 in. x 25 ft |
| Material | SBS rubber and asphalt blend with fiber glass/polyester reinforcement mat |
| Finish / texture | White ceramic-coated roofing granule surface |
| Length | 25 ft |
| Width | 36 in. |
| Coverage per unit | 36 in. x 25 ft per roll |
| Intended use | Flashing sheet / cap sheet membrane in multi-ply (BUR and modified bitumen) roofing systems |
| Approvals | Meets or exceeds ASTM D 6221, Type I |
Coverage & How Much You Need:
One 36 in. x 25 ft roll covers 75 sq ft of flashing or cap sheet area before laps; apply with the side and end laps required by the JM system specification, which reduces net coverage.
Fit and Compatibility:
Used within Johns Manville multi-ply BUR and modified bitumen roofing systems as a flashing or cap sheet; base sheets, ply sheets, adhesives, and mastics are specified and sold separately per the JM system specification.
Frequently Asked Questions (FAQ):
Q: What size is the roll?
A: 36 inches wide by 25 feet long, one roll per order unit.
Q: What is it used for?
A: It serves as a composite-reinforced cap sheet or flashing membrane in a variety of multi-ply roofing systems.
Q: What standard does it meet?
A: It meets or exceeds ASTM D 6221, Type I.
Q: Why the granule surface?
A: Ceramic-coated granules are engineered for optimal embedment and promote excellent long-term adhesion.
Q: Why choose an SBS sheet?
A: The SBS rubber and asphalt blend gives elongation and recovery, so the sheet flexes with normal roof movement.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
DynaFlex's fiberglass/polyester mat gives you the lay-flat handling of glass with the toughness of polyester, making it a good flashing choice at walls, curbs, and penetration details. Torch, mop, or adhere per the JM system specification and maintain proper head and side laps. White granule surfacing also adds reflectivity where the flashing is exposed.
Hot-applied modified bitumen work involves open flame or hot asphalt; follow fire safety procedures and job-site hot-work permits.
Order the JM DynaFlex SBS Mineral-Surfaced Flashing Sheet, White 36" x 25', for durable multi-ply flashing details.
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