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The Alpha SuperFlex RV roof membrane 8.5 foot wide by 400-foot roll is the commercial and dealer format of Alpha's most popular roof membrane line. Whether you call it by part number SFX850AL400 or simply the Alpha SuperFlex RV roof membrane 8.5 foot commercial roll, this is the bulk-stocking format that dealers and RV parks buy when they replace multiple roofs per season. At 3,400 square feet per roll, it is sized for RV dealerships, repair shops, and RV parks that replace multiple roofs per season and want to buy once rather than repeatedly sourcing individual project rolls. The same membrane formula — flexible, UV-resistant, and puncture-resistant EPDM-blend construction — applies to every roll in the SuperFlex line regardless of color or length.
What Makes SuperFlex Different from Standard RV Roof Membrane
Standard EPDM membranes are rigid enough to crack at seams when an RV flexes over highway bumps and terrain changes. Alpha SuperFlex is engineered with a higher flexibility and stretch rating, which lets the membrane move with the roof structure without tearing at edges, corners, or around vents. It also accommodates the complex curved contours common on modern fifth wheels and Class A motorhomes that standard flat-cut membrane cannot conform to cleanly.
- High stretch and flexibility: Moves with the coach through normal highway flex without stress-cracking at corners or vent cutouts
- Puncture-resistant surface: Resists hail, debris, and foot traffic during installation and service
- UV-stable construction: Rated for full outdoor exposure; does not degrade or chalk under prolonged sun exposure at the rate standard rubber membranes do
- Consistent adhesion: Compatible with standard RV roof adhesives and lap sealants already in use at most service shops
- Width: 8.5 feet — covers the standard RV roof width for most travel trailers and fifth wheels in one uncut pass
- Roll length: 400 feet — approximately 12 to 16 complete roof reskins per roll at typical RV sizes
- Color: Almond — factory cross-reference SFX850AL400 / SKU 2023037103
How Much Coverage to Expect
A full 400-foot roll covers 3,400 square feet total. Most travel trailer and fifth wheel roofs run between 200 and 350 square feet depending on length. Plan for 10 to 15 percent extra for overlap, edge wraps, and cutouts around vents and skylights. A typical 32-foot fifth wheel roof (roughly 250 square feet net) uses approximately 285 square feet of membrane with proper overlap. One 400-foot roll is enough for approximately 10 to 12 complete roofs at that size.
Alpha SuperFlex 8.5-Foot Width — Available Roll Lengths
All lengths use the same membrane formula. Choose the roll length that matches your shop's usage volume.
| Roll Length | Coverage (sq ft) | Best For | View Details |
|---|---|---|---|
| 8.5' x 20' | 170 sq ft | Single small trailer or section repair | View 20' |
| 8.5' x 25' | 212 sq ft | Single mid-size trailer roof | View 25' |
| 8.5' x 30' | 255 sq ft | Single standard fifth wheel or travel trailer | View 30' |
| 8.5' x 35' | 298 sq ft | Larger fifth wheel; one roll per coach | View 35' |
| 8.5' x 40' | 340 sq ft | Large travel trailer or motorhome; one roll per coach | View 40' |
| 8.5' x 400' (this product) | 3,400 sq ft | Multi-unit shops, dealerships, RV parks — 10 to 12 roofs per roll | Current Product |
Also available in Beige, Gray, and White at the 400-foot roll size. Color does not affect performance — choose based on your existing roof color or manufacturer standard.
Frequently Asked Questions
- What makes the Alpha SuperFlex RV roof membrane 8.5 foot format different from standard EPDM membrane?
- Standard EPDM is less flexible and can stress-crack at corners, seams, and around roof penetrations as the coach flexes. SuperFlex uses a modified formulation with higher flexibility and stretch ratings, which helps the membrane move with the coach structure rather than fighting it. The result is fewer edge failures and longer seam life on coaches that see regular road use.
- Does the 400-foot roll ship standard freight or do I need to arrange LTL?
- The 400-foot commercial roll is a large-format freight item. Contact us before placing your order so we can confirm current freight options and coordinate delivery. Standard parcel carriers (UPS, FedEx) cannot handle this roll size.
- Can I use this membrane with existing Alpha Systems adhesives and lap sealants?
- Yes. SuperFlex is designed to work with Alpha's standard roof adhesives and lap sealants. If you are using another brand's adhesive, confirm compatibility with the adhesive manufacturer before applying, as EPDM-blend membranes have specific primer and adhesive requirements.
- What colors are available at the 400-foot roll size?
- Almond (this product), Beige, Gray, and White. All four colors are available in the 400-foot commercial roll format. Color selection is based on aesthetics and matching your existing roof or manufacturer specification — it does not affect membrane performance.
- Is a 9.5-foot wide version available for wider coach roofs?
- Yes, Alpha SuperFlex is also available in 9.5-foot widths for coaches that are too wide for an 8.5-foot single-pass installation. Contact us to check availability and pricing on 9.5-foot width options.
| Color | Almond |
|---|---|
| Width (feet) | 8.5 |
| Length (feet) | 400 |
| Weight (pounds) | 10 |
- What are the dimensions of the alpha systems superflex almond? The Alpha Systems Superflex Almond measures 8.5 feet by 400 feet.
- What is the sku number for the alpha systems superflex almond? The SKU number is 2023037103.
- What type of product is the alpha systems superflex almond? It is an adhesive product.
- Is there a cross-reference part number for this product? Yes, the cross-reference part number is SFX850AL400.
- What is the physical weight of the alpha systems superflex almond? The physical weight of the product is 10.0 pounds.
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.