R Guard Fast Flash Roller Grade Waterproofing Membrane Compound - 2 Gallons

PROSOCO R-Guard FastFlash Roller Grade — Seamless Liquid Flashing Membrane for Demanding Rough Opening & Joint Applications

Technical Specifications

PROSOCO R-Guard FastFlash (Roller Grade) is a single-component, silyl-terminated polymer (STP) waterproofing, adhesive, and detailing compound engineered for professional contractors working on air barrier and flashing applications. It applies via gun, spread, tool, or roller to form a seamless, elastomeric membrane that bonds durably to common construction substrates. FastFlash is suited for rough openings, joints and seams, counterflashing, penetration sealing, and countersunk fastener protection in both new construction and existing wall assemblies.

Unlike conventional silicone or polyurethane sealants, FastFlash combines the best performance characteristics of both chemistries in a single-component, ready-to-use formulation. There are no mixing ratios to manage, and its roller-grade viscosity allows rapid coverage over large or irregular surfaces where a standard gun-apply product would be impractical.

Key Features & Benefits

Silyl-Terminated Polymer (STP) Chemistry

STP chemistry bridges the gap between silicone flexibility and polyurethane adhesion, delivering a membrane that remains highly elastic after cure. For contractors, this means the flashing accommodates building movement, thermal cycling, and substrate irregularities without cracking or delaminating.

Single-Component, No-Mix Formula

FastFlash ships ready to apply with no measuring or mixing required. This reduces labor time on the jobsite and eliminates the risk of off-ratio mixing errors that can compromise membrane performance.

Seamless, Elastomeric Membrane

Once applied, FastFlash cures to a continuous, seamless membrane with no laps, seams, or mechanical fastener penetrations to manage. A seamless membrane eliminates common failure points found in sheet-applied flashing tapes, particularly at corners and irregular geometries.

Multiple Application Methods — Roller Grade

This roller-grade formulation can be gunned, spread, tooled, or roller applied, giving crews flexibility to match the application method to the specific detail. Roller application is especially efficient on larger rough openings and wall field areas where speed and uniform thickness matter.

Low VOC Content

FastFlash contains less than 30 g/L VOC content, well below the SCAQMD 1168 limit of 250 g/L for architectural sealants, and is California Air Resources Board (CARB) 2007 compliant. Low VOC content supports use on projects requiring green building documentation and reduces exposure concerns for crews working in confined or partially enclosed areas.

Green Building Program Support

FastFlash carries a Declare label (PRO-0009) and is certified Red List Free under the Living Building Challenge 3.0. It is CDPH Standard Method v1.2-2017 compliant with total VOCs of 0.5 mg/m³ or less at 14 days, and holds SCS Indoor Advantage Gold certification, supporting LEED 2009, LEED v4.x, CALGreen, Living Building Challenge 3.x, WELL v2, and Fitwel documentation requirements.

Common Applications

Rough Opening Flashing

Apply FastFlash around window and door rough openings to create a continuous waterproof and air-sealing membrane that integrates with the wall's air barrier system.

Joints and Seams

Use to fill and bridge joints and seams in wall assemblies, providing a flexible, waterproof seal that moves with the structure.

Counterflashing

FastFlash can counterflash waterproofing and air barrier components in both new construction and existing wall assemblies, maintaining continuity at transitions.

Penetration Sealing

Seal around pipe, conduit, and other mechanical penetrations through the building envelope to prevent water infiltration and air leakage.

Countersunk Fastener Protection

Apply over countersunk fastener heads to protect them from moisture intrusion and maintain the integrity of the air and water barrier at mechanical attachment points.

Compatible Materials

• Rough opening framing (wood, engineered wood)
• Sheathing substrates (OSB, plywood, cementitious)
• Air barrier membranes and wraps
• Waterproofing membrane components
• Masonry and concrete surfaces
• Metal flashing and fastener heads

Product Documents

• Product Data Sheet
• Product Data Sheet (Canadian French)
• Product Data Sheet (Spanish)
• Safety Data Sheet
• Safety Data Sheet (Spanish)
• SDS (Canadian French)
• VOC Compliance
• Product Test Data
• Product Test Data — ASTM E2357 Results
• LEED Verification Letter
• SCS Certification
• LBC Red List Conformant Product Summary

Frequently Asked Questions

Q: Is FastFlash Roller Grade a single-component product, or does it require mixing?
A: FastFlash is a single-component product — no mixing is required. It is ready to apply directly from the container.

Q: Can FastFlash be used on both new construction and existing wall assemblies?
A: Yes. FastFlash is formulated for use in both new and existing wall assemblies, including counterflashing of waterproofing and air barrier components.

Q: Does FastFlash qualify for LEED and other green building project submittals?
A: Yes. FastFlash supports documentation for LEED 2009, LEED v4.x, CALGreen, Living Building Challenge 3.x, WELL v2, and Fitwel. It is CDPH Standard Method v1.2-2017 compliant, CARB 2007 compliant, holds SCS Indoor Advantage Gold certification, and carries a Declare label (PRO-0009) with Red List Free status.

Q: What is the difference between FastFlash Roller Grade and Gun Grade?
A: Roller Grade is formulated with a viscosity suited to roller application and spreading over larger surface areas, while still being gunnable and toolable. It is well-suited for wall field areas and large rough openings where roller coverage is more efficient.

Q: What CSI MasterFormat divisions does FastFlash fall under?
A: FastFlash is specified under CSI MasterFormat (2014) Divisions 07 25 00, 07 27 00, and 07 27 26.