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Johns Manville APP Base or Ply Sheet 39.375 in. x 49 ft 3 in. Fiber Glass Reinforced Modified Bitumen
Regular price $103.90Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville APP Base or Ply Sheet 39.375 in. x 49 ft 3 in. Fiber Glass Reinforced Modified Bitumen
JM APP Base 2.0 SQ is an APP (atactic polypropylene) polymer-and-asphalt sheet used as a base or ply sheet in APP multi-ply roofing systems. The 39.375 in. x 49 ft 3 in. sheet is fiber glass reinforced for dimensional stability, with a mineral parting agent on top and a polyolefin burn-off film underneath for heat welding.
Key Features:
- ASTM D 6509: Meets the requirements of ASTM D 6509.
- APP durable blend: APP polymer and asphalt blend provides a durable sheet with excellent weathering, flexibility, and dimensional stability.
- Fiber glass mat: Fiber glass reinforcement mat offers excellent dimensional stability and tensile strength and withstands differential movement.
- No thermal memory: The fiber glass mat has no thermal memory, so less time is needed to relax the sheet for faster installation.
- Heat-weld ready: A polyolefin burn-off film on the bottom side enables heat welding application.
- Dual role: Serves as either the base sheet or an intermediate ply in APP multi-ply systems.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 sheet, 39.375 in. x 49 ft 3 in. (2.0 SQ) |
| Product line | JM APP Base 2.0 SQ |
| Dimensions | 39.375 in. x 49 ft 3 in. |
| Material | APP (atactic polypropylene) polymer and asphalt blend |
| Reinforcement | Fiber glass reinforcement mat |
| Surfaces | Fine mineral parting agent on top; polyolefin burn-off film on bottom |
| Approvals | Meets the requirements of ASTM D 6509 |
| Intended use | Base or ply sheet in APP multi-ply roofing systems |
Coverage & How Much You Need:
The sheet is designated 2.0 SQ, approximately 200 ft² nominal per roll before laps. Deduct side and end laps per the system specification when estimating.
Fit and Compatibility:
For use within Johns Manville APP multi-ply roofing systems as a base or ply sheet. Cap sheets, adhesives, primers, and flashing materials are sold separately.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One sheet measuring 39.375 in. x 49 ft 3 in., rated 2.0 SQ.
Q: How is it applied?
A: The polyolefin burn-off film on the bottom side enables heat welding application; confirm the approved application method for your system.
Q: How much area does one sheet cover?
A: Nominal 2.0 SQ (about 200 ft²) before laps and waste.
Q: What standard does it meet?
A: It meets the requirements of ASTM D 6509.
Q: Can it be used as a cap sheet?
A: No, it is designed as a base or ply sheet; a dedicated cap sheet is required for the exposed surface.
Q: Why fiber glass reinforcement?
A: It provides dimensional stability, tensile strength, and resistance to differential movement, with no thermal memory for faster handling.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
As a glass-mat APP sheet, this product relaxes quickly on the roof, which speeds up hot or heat-welded multi-ply installs compared with polyester-reinforced sheets that fight you with memory. Use it as the base or intermediate ply beneath a matching JM APP cap sheet, keeping laps properly mopped or welded. In cold weather, allow extra relaxation time and stage rolls flat before application.
Heat welding and torch work carry fire risk; use trained crews, fire watch, and follow local codes.
Order JM APP Base or Ply Sheet for a dimensionally stable foundation in APP multi-ply roofing systems.
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