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Johns Manville APP Plus Base or Ply Sheet, 39-3/8 in. x 49 ft. 3 in. Roll
Regular price $133.00Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville APP Plus Base or Ply Sheet, 39-3/8 in. x 49 ft. 3 in. Roll
JM APP Base Plus is an APP polymer-modified asphalt sheet used as a base or ply sheet in APP multi-ply roofing systems. This listing is one 39-3/8 in. x 49 ft. 3 in. roll. The fiber glass-reinforced sheet installs quickly with cold adhesive or heat welding, thanks to its mineral parting agent surfacing on both sides.
Key Features:
- Durable APP blend: The APP polymer and asphalt blend creates an extremely durable sheet with excellent weathering, flexibility, and dimensional stability.
- Fiber glass mat: The fiber glass reinforcement mat provides tensile strength and withstands differential movement.
- Lays flat: No thermal memory means less relaxation time and virtually wrinkle-free, fast installation.
- Dual application: Fine mineral parting agent on both sides enables cold adhesive or heat-welded application.
- Base or ply use: Designed to serve as either a base sheet or an intermediate ply in APP multi-ply systems.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 roll, 39-3/8 in. x 49 ft. 3 in. |
| Product line | JM APP Base Plus |
| Available sizes | 39-3/8 in. x 49 ft. 3 in. roll |
| Material | APP polymer-modified asphalt with fiber glass reinforcement mat |
| Dimensions | 39-3/8 in. x 49 ft. 3 in. |
| Coverage per unit | Approx. 133 sq. ft. per roll before laps |
| Surfacing | Fine mineral parting agent on both sides |
| Application methods | Cold adhesive or heat welding |
| Intended use | Base or ply sheet in APP multi-ply roofing systems |
Coverage & How Much You Need:
One 39-3/8 in. x 49 ft. 3 in. roll yields roughly 133 sq. ft. before side and end laps. Plan roll counts from net roof area plus your specified lap allowances.
Fit and Compatibility:
Use as a base or ply sheet within JM APP multi-ply systems; cap sheets, adhesives, and flashing accessories are sold separately. Compatible with both cold adhesive and heat-welding application methods.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One roll of JM APP Base Plus, 39-3/8 in. x 49 ft. 3 in.
Q: How much area does one roll cover?
A: Roughly 133 sq. ft. before laps; subtract lap area for net coverage.
Q: What installation methods work?
A: Cold adhesive or heat welding, enabled by the mineral parting agent on both sides.
Q: What reinforces the sheet?
A: A fiber glass mat offering dimensional stability, tensile strength, and resistance to differential movement.
Q: Where is it used in the system?
A: As a base sheet or ply sheet in APP multi-ply roofing assemblies.
Q: Does the sheet need to relax before adhering?
A: The fiber glass mat has no thermal memory, so less relaxation time is needed for quick installation.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
This smaller APP roll is handy for detail work and smaller roof sections where a full 2-square roll is cumbersome. Confirm lap dimensions with the system specification, and store rolls flat and shaded to keep the sheet easy to unroll on install day.
Follow hot-work precautions and wear heat-resistant gloves when heat welding APP-modified sheets.
Order the JM APP Plus base or ply sheet roll for your APP multi-ply roofing system.
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