The RUBEROID MOP Granule FR Membrane White 39.625" x 32.56' is a bur & mb systems for jobs that require GAF model/MPN 3866920 in the RL sell unit. A fire-retarding modified bitumen membrane manufactured to stringent GAF specifications.

Key Specs

• Brand: GAF
• Model / MPN: 3866920
• SKU: GAFRMGFRWH
• Sell unit: RL
• Product type: BUR & MB Systems
• Size / color: 39.625" x 32.56'
• Category: Commercial Roofing | Commercial Roofing/Membranes | Commercial Roofing/Membranes/BUR & MB Systems

Key Features

• Typical system guarantees available for up to 15 years; select system constructions available with up to 20-year guarantee coverage
• No coating required for Class A ratings from UL and FMRC
• Installed roof designs weigh less than 2 pounds per square foot

Coverage & How Much You Need

Coverage or yield is not specified in the available product details. Use the manufacturer installation instructions and project takeoff before converting the job size into order quantity.

Compatibility / Fitment

Use this item only when the brand, model/MPN, size/color, sell unit, and system type match the project specification. Do not substitute it for a different bur & mb systems, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

RUBEROID MOP Granule FR Membrane White 39.625" x 32.56', sold as RL, with SKU GAFRMGFRWH and manufacturer model/MPN 3866920.

What model or part number should I match?

Match model/MPN 3866920 and confirm the brand is GAF. If the job spec lists a different model, size, color, or system family, hold for review.

What unit is the price based on?

This listing is built around the RL sell unit. Confirm the unit before comparing price, quantity, or coverage.

How do I estimate quantity?

Coverage or yield is not specified in the available product details. Use the project takeoff and manufacturer instructions before estimating quantity.

What should be checked before purchase?

Confirm the model/MPN, sell unit, size/color, jobsite condition, compatible system components, and any manufacturer installation limits before approving the order.

Roofing and exterior-envelope work can involve fall hazards, weather exposure, fumes, adhesives, and system-specific installation requirements; follow the manufacturer instructions, OSHA-safe work practices, and local code or use a qualified contractor.

Product Expert Notes

Choose this item when GAF model/MPN 3866920, SKU GAFRMGFRWH, and the RL sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.