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Johns Manville JM Vapor Barrier SA Self-Adhering Roofing Underlayment 45 in. x 468 ft. White Roll
Regular price $470.00Johns Manville JM Vapor Barrier SA Self-Adhering Roofing Underlayment 45 in. x 468 ft. White Roll
JM Vapor Barrier SA is a self-adhering, tri-laminate woven polyethylene vapor barrier for commercial roofing, supplied as one white 45 in. x 468 ft. roll. Its self-sealing SBS rubber and asphalt blend provides low air and vapor permeability, and the UV-protected nonslip top surface gives temporary weather protection for 90 days.
Key Features:
- Tri-Laminate Strength: Tri-laminate woven polyethylene construction provides high tensile strength and puncture resistance.
- Self-Sealing: Self-sealing SBS rubber and asphalt blend provides low air and vapor permeability.
- UV-Protected Surface: Nonslip, UV-protected top surface offers temporary weather protection for 90 days.
- Nonslip Walkability: The nonslip top surface improves footing during installation.
- Long Roll Length: Each roll measures 45 in. x 468 ft. for broad coverage per unit.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 roll, 45 in. x 468 ft. |
| Product line | JM Vapor Barrier SA |
| Material | Tri-laminate woven polyethylene with self-sealing SBS rubber and asphalt blend |
| Color / finish | White |
| Dimensions | 45 in. x 468 ft. |
| Coverage per unit | One 45 in. x 468 ft. roll |
| Finish / texture | Nonslip, UV-protected top surface |
| Wind / fire / impact rating | Provides temporary weather protection for 90 days; high tensile strength and puncture resistance |
| Intended use | Commercial roofing vapor barrier |
Coverage & How Much You Need:
One roll measures 45 in. wide by 468 ft. long, covering roughly 1,755 sq. ft. laid flat before laps. Size your job by counting rolls against deck area and accounting for side and end laps.
Fit and Compatibility:
Intended for use in commercial roofing assemblies as a vapor barrier layer; consult the roofing system specification for compatible membranes and adhesives, which are sold separately.
Frequently Asked Questions (FAQ):
Q: What is included in one order?
A: One white roll of JM Vapor Barrier SA measuring 45 in. x 468 ft.
Q: How much area does one roll cover?
A: Laid flat, a roll covers approximately 1,755 sq. ft.; deduct lap allowances when estimating.
Q: How long does it protect against weather?
A: The UV-protected top surface provides temporary weather protection for 90 days.
Q: Is it self-adhering?
A: Yes, it uses a self-sealing SBS rubber and asphalt blend with low air and vapor permeability.
Q: Is the surface safe to walk on?
A: The top surface is nonslip and designed for footing during installation.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
A self-adhering woven polyethylene vapor barrier like this is a smart choice under fully adhered membrane systems where air and vapor drive are a concern. Plan work so the 90-day UV exposure window fits your schedule, and prime substrates per the system specification before applying. Overlap laps fully and roll them down to ensure the self-sealing blend bonds without voids.
Roof work carries fall hazards; use appropriate fall protection and take care with cutting tools when trimming the membrane.
Order the Johns Manville JM Vapor Barrier SA 45 in. x 468 ft. roll for your commercial roofing project.
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