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Malarkey 430 OmniSeal SA Cap, Self-Adhering Polymer-Modified Asphalt Cap Sheet, 39-3/8 in. x 34 ft Rolls, 5 Colors
Regular price $133.00Orders start at $399 — combine any items to reach the minimum. Learn more
Malarkey 430 OmniSeal SA Cap, Self-Adhering Polymer-Modified Asphalt Cap Sheet, 39-3/8 in. x 34 ft Rolls, 5 Colors
Malarkey 430 OmniSeal SA Cap is a premium self-adhering, polymer-modified (rubberized) asphalt cap sheet for low-slope commercial roofing. Each roll measures 39-3/8 in. x 34 ft with a 4 in. selvage edge for lap joint seams. It is used with a base sheet to build 2-3 layer multi-ply systems and comes in five granule colors including Midnight Black and Weathered Wood.
Key Features:
- Rubberized asphalt: Made with Malarkey's industry-leading Polymer Modified (rubberized) asphalt.
- Self-adhering: Self-adhering installation with split-surface release film removed during application.
- Selvage lap edge: Topside edge has a 4 in. (102 mm) selvage for lap joint seams.
- Multi-ply system: Used as a cap/base sheet to create 2-3 layer multi-ply systems meeting desired performance and cost.
- Low-slope rated: Designed for low-slope commercial roofing applications.
- Certified performance: Meets ASTM D3909 and D7530, ASTM E108 Class B & C, UL 2218 Class 4; Intertek Listed.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Malarkey |
| Sell unit | 1 roll (RL) or 1 square (SQ) depending on color |
| Product line | Malarkey OmniSeal 430 SA Cap |
| Available colors | Midnight Black, Weathered Wood, Storm Gray, Sienna, Antique Brown, Tan/Buff |
| Available sizes | 39-3/8" x 34' roll |
| Material | Polymer modified (rubberized) asphalt sheet with granule surface |
| Dimensions | 39-3/8 in. x 34 ft per roll |
| Selvage | 4 in. (102 mm) topside selvage for lap joint seams |
| Application | Self-adhering; split-surface release film removed during installation |
| Coverage per unit | Approximately 1 square per roll before laps (39-3/8 in. x 34 ft) |
| Approvals | ASTM D3909; ASTM D7530; ASTM E108 Class B & C; UL 2218 Class 4; Intertek Listed |
| Intended use | Low-slope commercial roofing cap sheet in 2-3 layer multi-ply systems |
Coverage & How Much You Need:
Each 39-3/8 in. x 34 ft roll yields roughly one roofing square of cap-sheet area; install with the 4 in. selvage lap so net coverage is reduced by lap joints. Divide roof area by one square and add rolls for laps, starter cuts and waste.
Fit and Compatibility:
Designed to pair with a Malarkey base sheet to form 2-3 layer multi-ply systems on low-slope commercial roofs. Primers, base sheets and terminations are sold separately.
Frequently Asked Questions (FAQ):
Q: What comes on a roll?
A: One roll of self-adhering cap sheet, 39-3/8 in. x 34 ft, in your selected granule color.
Q: How much does one roll cover?
A: A roll is approximately one square before laps; account for the 4 in. selvage lap and waste when ordering.
Q: How is it installed?
A: Peel the split-surface release film and press the self-adhering sheet into place, lapping the 4 in. selvage edge at seams.
Q: What colors are offered?
A: Midnight Black, Weathered Wood, Storm Gray, Sienna, Antique Brown and Tan/Buff.
Q: What certifications does it carry?
A: ASTM D3909, ASTM D7530, ASTM E108 Class B & C, UL 2218 Class 4, and Intertek Listed.
Q: What system does it belong in?
A: It is used with a base sheet to build 2-3 layer multi-ply systems for low-slope commercial roofs.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Choose OmniSeal 430 when a low-slope roof needs rubberized asphalt resilience and a granule-surfaced finish without torch or hot asphalt. Prime and dry the substrate, roll the sheet firmly to eliminate voids, and work seams before temperatures drop, since self-adhered laps need adequate surface temperature. Match the granule color to adjacent Malarkey shingle work for a uniform appearance.
Keep release film and adhesive away from open flame and hot work; follow low-slope roof safety practices including fall protection and membrane slip precautions when wet.
Order Malarkey 430 OmniSeal SA Cap rolls for a premium self-adhered multi-ply roof system.
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