GAF MajorSeal Liquid Flashing 4-Pouch Pack, Matrix 202 Membrane System

GAF MajorSeal Liquid Flashing is a liquid-applied flashing for GAF Matrix commercial roofing systems, sold here as a 4-pouch pack. Use it to flash details, penetrations, and terminations where sheet flashing is impractical. Complies with CARB, SCAQMD, and OTC VOC requirements and is tested per ASTM D 2369 and EPA Method 24.

Key Features:

• Liquid-applied flashing: Liquid flashing for detailing GAF commercial roofing systems where sheet flashing is impractical.
• 4-pouch pack: One order unit contains 4 pouches of material.
• Low VOC: Meets CARB, SCAQMD, and OTC VOC requirements.
• Tested to standards: Tested per ASTM D 2369 and EPA Method 24.
• Matrix system: Part of the GAF Matrix commercial accessories lineup.

Specifications Table:

Coverage & How Much You Need:

Coverage depends on the detail geometry and applied film thickness specified by GAF for MajorSeal; size the job from the GAF MajorSeal product data sheet, not from a fixed per-pouch rate.

Fit and Compatibility:

Intended for use within GAF commercial roofing systems; confirm substrate and membrane compatibility with the GAF Matrix/MajorSeal specifications. Primer and reinforcing fabric may be specified by the GAF detail and are sold separately.

Frequently Asked Questions (FAQ):

Q: How many pouches come in a pack?
A: 4 pouches per pack; 4 pouches are also per carton, so one pack equals one carton.

Q: What is MajorSeal used for?
A: Liquid-applied flashing for roofing details, penetrations, and terminations in GAF commercial roofing systems.

Q: Is it low VOC?
A: Yes, it is listed as compliant with CARB, SCAQMD, and OTC VOC requirements.

Q: How much area does one pack cover?
A: Coverage depends on the specified thickness and detail; consult the GAF MajorSeal product data sheet for coverage rates.

Q: Does it need reinforcement?
A: Follow the specific GAF detail for the assembly; some details call for reinforcing fabric or primer, sold separately.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Liquid flashing saves time on complex penetrations, scuppers, and irregular details where cutting and welding sheet flashing is slow; however, quality depends on strict surface prep and the film thickness GAF specifies. Apply within the pot life and environmental window given on the GAF data sheet. Use within a GAF commercial system specification if a guarantee is involved.

Follow the GAF safety data sheet for ventilation, skin protection, and solvent-handling precautions when applying liquid flashing.

Order the GAF MajorSeal Liquid Flashing 4-pouch pack for your commercial roofing details.