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Johns Manville PermaFlash Scrim, Flexible Stitchbonded Polyester Flashing Fabric, 12 in. x 300 ft Roll, White
Regular price $232.00Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville PermaFlash Scrim, Flexible Stitchbonded Polyester Flashing Fabric, 12 in. x 300 ft Roll, White
JM PermaFlash Scrim is a flexible stitchbonded polyester flashing fabric forming part of the PermaFlash System for bituminous roofing. Each white roll measures 12 in. x 300 ft and is compatible with all JM Multi-Ply Systems. Pair it with PermaFlash Primer where needed and either 1-Part PermaFlash or MBR Flashing Cement and Activator.
Key Features:
- Integrated System: Part of the PermaFlash System, an integrated flashing system formulated for bituminous roofing.
- Polyester Scrim: Made from flexible stitchbonded polyester for conformable flashing reinforcement.
- Multi-Ply Compatible: Compatible with all JM Multi-Ply Systems.
- Long Roll: Packaged in 12 in. x 300 ft rolls for extended flashing runs.
- White Color: Supplied in white.
- System Pairing: A complete system includes PermaFlash Primer when needed plus 1-Part PermaFlash or MBR Flashing Cement and Activator.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 roll, 12 in. x 300 ft |
| Product line | PermaFlash System |
| Available colors | White |
| Available sizes | 12 in. x 300 ft roll |
| Material | Stitchbonded polyester scrim |
| Dimensions | 12 in. wide x 300 ft long |
| Finish / texture | Flexible fabric |
| Intended use | Flashing reinforcement in bituminous roofing systems |
Coverage & How Much You Need:
One roll provides 300 linear feet of 12 in.-wide flashing reinforcement; overlap per the PermaFlash System details when planning a job.
Fit and Compatibility:
For use within the PermaFlash System with all JM Multi-Ply Systems. PermaFlash Primer (when needed), 1-Part PermaFlash or MBR Flashing Cement and Activator are required to complete the system and are sold separately.
Frequently Asked Questions (FAQ):
Q: What comes on a roll?
A: One white roll of stitchbonded polyester scrim, 12 in. wide by 300 ft long.
Q: What else do I need for the PermaFlash System?
A: PermaFlash Primer when needed, plus either 1-Part PermaFlash or MBR Flashing Cement and Activator.
Q: What is the scrim made of?
A: It is a flexible stitchbonded polyester scrim.
Q: Will it work with my JM roof?
A: It is compatible with all JM Multi-Ply Systems.
Q: How much flashing area does one roll cover?
A: At 12 in. wide, one 300 ft roll yields 300 linear feet of reinforced flashing; lap as the system details require.
Q: What is it used for?
A: It reinforces flashings in bituminous (multi-ply and BUR) roofing systems.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Embed the scrim fully into the PermaFlash mastic or cement, working out wrinkles so the fabric wets through, then top-coat per the system details. Plan base, corner and penetration flashings to keep laps shingle-style with water flow. Order primer when flashing aged or chalky surfaces to promote adhesion.
Follow the flashing cement or sealant manufacturer's safety instructions, including ventilation and solvent-handling precautions during application.
Order JM PermaFlash Scrim in 12 in. x 300 ft rolls and complete your PermaFlash flashing system.
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