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Johns Manville Dynalastic 180 White SBS Modified Bitumen Cap Sheet, 1 Square Roll
Regular price $153.25Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville Dynalastic 180 White SBS Modified Bitumen Cap Sheet, 1 Square Roll
Johns Manville Dynalastic 180 is a white SBS modified bitumen cap sheet supplied as a one-square roll. It is the weathering layer for low-slope multi-ply roofing systems and installs over compatible JM base and interply sheets.
Key Features:
- 180 grade: Dynalastic 180 is the listed grade within the Dynalastic cap sheet line.
- SBS elastomeric: SBS modified asphalt offers flexibility and elongation.
- White surface: White finish provides a light-colored weathering surface.
- Full square roll: One roll covers one square.
- Multi-ply cap: Serves as the top membrane layer in low-slope assemblies.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 roll |
| Product line | Johns Manville Dynalastic 180 Cap Sheet |
| Membrane type | SBS modified bitumen |
| Available colors | White |
| Coverage per unit | 1 square per roll |
Coverage & How Much You Need:
One roll covers one square (100 sq ft); factor in side and end laps and waste when calculating quantity.
Fit and Compatibility:
Used as the cap sheet over Johns Manville SBS modified bitumen base and interply products. Base sheets, primers, mastic and fastening products are sold separately.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One white Dynalastic 180 cap sheet roll covering one square.
Q: What does the 180 indicate?
A: It identifies the Dynalastic 180 grade within the product line; detailed construction data is not stated in the listing.
Q: Is this the base sheet?
A: No, it is a cap sheet intended as the top layer of a multi-ply system.
Q: How many rolls for 10 squares?
A: At one square per roll, plan roughly 10 rolls plus allowance for laps and waste.
Q: What color is available?
A: White is the listed color.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Dynalastic 180 is selected when a specification calls for a white elastomeric cap sheet at this grade; match it with the specified JM base and interply layers for a warranted assembly. Confirm attachment and lap requirements against the system specification. Add laps of roughly 10 percent to roll counts on low-slope decks.
Follow the manufacturer's installation method and site safety procedures; membrane installation on low-slope roofs requires appropriate fall protection.
Order Johns Manville Dynalastic 180 white cap sheet for your next multi-ply roofing project.
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