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Johns Manville Expand-O-Flash CF/EJ Curb-to-Wall Expansion Joint Cover, 4 in., 6 in. or 8 in. Rubber Bellows
Regular price $1,520.00Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville Expand-O-Flash CF/EJ Curb-to-Wall Expansion Joint Cover, 4 in., 6 in. or 8 in. Rubber Bellows
Johns Manville Expand-O-Flash CF/EJ curb-to-wall expansion joint covers are flexible, weatherproof exterior closures for expansion joint openings. Each cover combines a flexible rubber membrane with closed-cell foam bellows and two metal flanges. Offered in 4 in., 6 in. and 8 in. sizes, sold per box or piece.
Key Features:
- Multidirectional movement: Accommodates multidirectional building movement at curb-to-wall expansion joints.
- Flexible bellows: Non-reinforced bellows of rubber membrane over closed-cell foam allow both geometric and elastomeric movement.
- Metal flange mounting: Two metal flanges are adhesively and mechanically combined to the bellows by a patented bifurcation process.
- Watertight intersections: Factory-fabricated intersections are made for maximum flexibility with watertight, clean seam lines.
- Multiple sizes: Available in 4 in., 6 in. and 8 in. sizes for different joint requirements.
- Factory tolerances: Close factory tolerance and quality control assure high yield performance.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | Box or piece depending on size |
| Product line | JM Expand-O-Flash CF/EJ Curb-to-Wall Expansion Joint Cover |
| Available sizes | 4 in., 6 in., 8 in. |
| Material | Flexible rubber membrane with closed-cell foam bellows and metal flanges |
| Dimensions | 4 in., 6 in. or 8 in. joint cover |
| Membrane | Flexible rubber, supported by closed-cell foam bellows |
| Flanges | Two metal flanges, bifurcation process |
| Movement | Multidirectional; non-reinforced bellows for geometric and elastomeric movement |
| Intended use | Weatherproof exterior cover for curb-to-wall expansion joint openings |
Fit and Compatibility:
Part of the Johns Manville commercial roofing accessories line for multisystem use; pairs with JM roofing membranes and flashing systems. Custom or factory-fabricated intersections can be ordered; standard field covers only.
Frequently Asked Questions (FAQ):
Q: What sizes are available?
A: The CF/EJ curb-to-wall cover comes in 4 in., 6 in. and 8 in. sizes.
Q: What is the cover made of?
A: A flexible rubber membrane over closed-cell foam bellows with two metal flanges, combined by a patented bifurcation process.
Q: Can it handle movement in multiple directions?
A: Yes, the non-reinforced bellows accommodate multidirectional, geometric and elastomeric movement.
Q: Can corners and direction changes be covered?
A: Yes, labor-saving factory-crafted intersections are available, and covers can be custom designed for special needs.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Size the cover to the actual joint opening and expected movement, and order factory intersections wherever joints cross or change direction, since stress concentrates at those points. Attach flanges per JM system requirements and keep the bellows centered so movement is not restricted. This is a commercial roofing accessory intended for curb-to-wall joints, not wall-to-deck applications.
Install expansion joint covers per the roofing system manufacturer's requirements and confirm the correct cover size before ordering; roof work requires fall protection.
Order JM Expand-O-Flash CF/EJ expansion joint covers in 4 in., 6 in. or 8 in. for watertight curb-to-wall joints.
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