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Johns Manville JM ValuWeld S Cold Cap/Base Sheet APP Modified Bitumen Roll, Sand, 39-3/8 in. x 33 ft
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Johns Manville JM ValuWeld S Cold Cap/Base Sheet APP Modified Bitumen Roll, Sand, 39-3/8 in. x 33 ft
Johns Manville ValuWeld S is an APP (atactic polypropylene) polymer and asphalt modified bitumen sheet used as a cap or base sheet in APP multi-ply roofing systems, supplied as one Sand-finish roll measuring 39-3/8 in. x 33 ft. A fine mineral parting agent on both sides allows cold adhesive application, and the polyester reinforcement mat delivers tensile strength and puncture resistance. Pair with compatible JM APP multi-ply components.
Key Features:
- Dual-role sheet: Used as a cap or base sheet in APP multi-ply roofing systems.
- Durable blend: Premium APP polymer and asphalt blend provides excellent weathering, flexibility and dimensional stability.
- Polyester reinforced: Polyester reinforcement mat offers good tensile strength, toughness and puncture resistance.
- Handles movement: The reinforcement accommodates stresses created by typical rooftop expansion and contraction forces.
- Cold-applied: A fine mineral parting agent on both sides enables application using cold adhesive.
- Easy handling: Designed for ease of handling and quick installations.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 roll, 39-3/8 in. x 33 ft |
| Product line | ValuWeld S |
| Available colors | ['Sand'] |
| Dimensions | 39-3/8 in. x 33 ft roll |
| Material | APP (atactic polypropylene) polymer and asphalt blend |
| Reinforcement | Polyester mat |
| Surface | Fine mineral parting agent on both sides |
| Intended use | Cap or base sheet in APP multi-ply roofing systems |
| Application method | Cold adhesive application enabled by mineral parting agent |
| Category | BUR & MB systems membranes |
Coverage & How Much You Need:
One roll measures 39-3/8 in. x 33 ft (about 1 roll per roughly 1 square of roof before laps and waste); calculate rolls by dividing roof area by the net coverage after side and end laps required by the JM system specification.
Fit and Compatibility:
Intended for APP multi-ply roofing systems as a cap or base sheet; pair with JM cold adhesive or torch application per the system specification. Confirm cap vs. base role and lap requirements with the specific JM system detail.
Frequently Asked Questions (FAQ):
Q: What is included in one roll?
A: One roll of ValuWeld S in Sand, measuring 39-3/8 in. x 33 ft.
Q: What is the sheet made of?
A: A premium APP (atactic polypropylene) polymer and asphalt blend with a polyester reinforcement mat.
Q: Can it be cold applied?
A: Yes, the fine mineral parting agent on both sides of the sheet enables application using cold adhesive.
Q: What roles can it serve?
A: It can be used as a cap sheet or base sheet in APP multi-ply roofing systems.
Q: How much area does a roll cover?
A: Nominal coverage is based on the 39-3/8 in. x 33 ft dimensions; deduct for laps and waste per your JM system specification.
Q: How does it handle roof movement?
A: The polyester reinforcement accommodates stresses from typical rooftop expansion and contraction forces.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
ValuWeld S is the value play in JM APP multi-ply assemblies, serving as either base or cap so one product covers two roles on the buy. The mineral parting agent on both faces means you can cold-adhere it where torching is restricted. Order laps and perimeters per the JM system spec, and stage rolls flat and off the deck if installation will be delayed.
Follow all JM application instructions and site safety requirements; if torch applied, keep fire watch and extinguishing equipment on hand.
Order JM ValuWeld S Cold Cap/Base Sheet rolls for your next APP multi-ply roof.
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