Johns Manville MBR Cold Application Adhesive, 5 Gallon Pail, Black

Johns Manville MBR Cold Application Adhesive is a one-part, elastomeric cold-applied membrane adhesive in a 5-gallon pail of black adhesive that cures to a durable, watertight film. It adheres roofing plies, modified bitumen membranes and aggregate surfacings and substitutes directly for asphalt in JM modified bitumen specifications, with no heating required.

Key Features:

• Cold Process: Ready for use as shipped and does not have to be heated.
• Elastomeric Film: Cures to form a durable, elastomeric and watertight film.
• Direct Asphalt Substitute: Used as a direct substitute for asphalt in all JM modified bitumen roof membrane specifications.
• Multi-Method Application: Can be applied with a notched squeegee, notched trowel or spray equipment.
• Standards Listed: UL Classified, FM Approved and meets ASTM D3019, Type III, Grade 2.
• Manageable Pail: Approximately 48 lb pail with an average coverage of 50 to 70 sq ft per gallon per ply.

Specifications Table:

Coverage & How Much You Need:

Average coverage is 50 to 70 sq ft per gallon per ply, so one 4.7-gallon pail yields roughly 235 to 330 sq ft per ply depending on substrate and conditions. Use a 1/4 in. notched squeegee or trowel for squeegee/trowel application.

Fit and Compatibility:

For multi-ply BUR, APP and SBS systems only; do not use in single-ply TPO, PVC or EPDM systems. Use with fully coated nonporous felts such as JM GlasBase Plus, DynaBase, DynaPly, TRICOR S, BICOR S and JM APP Base Sheet; do not use with GlasPly IV, GlasPly Premier or APP products with a polyolefin burn-off film. Sold separately: JM Asphalt Primer for masonry surfaces.

Frequently Asked Questions (FAQ):

Q: What size is the container?
A: A 5-gallon pail (4.7-gallon manufacturer container) weighing approximately 48 lb.

Q: How much area does one pail cover?
A: At 50 to 70 sq ft per gallon per ply, one 4.7-gal pail covers roughly 235 to 330 sq ft per ply; rates vary with substrate and conditions.

Q: Does it need to be heated?
A: No, it is a cold process adhesive, ready for use as shipped; for spray application it must be heated to a minimum of 95F.

Q: What membranes can it be used with?
A: Fully coated nonporous JM felts such as GlasBase Plus, DynaBase, DynaPly, TRICOR S, BICOR S and JM APP Base Sheet; Ventsulation Felt is acceptable as base felt.

Q: Can it be used on single-ply roofs?
A: No. It is for multi-ply BUR, APP and SBS systems only and must not be used in single-ply systems.

Q: What is the shelf life?
A: 12 months from the manufacture date when stored clean, dry, indoors in an unopened container at 60F to 80F, protected from freezing.

Expert Verdict Reviewed by the SuperArbor Pro Desk

This adhesive is the cold-process backbone of JM modified bitumen assemblies: match the felt you choose to the approved list (no GlasPly IV or burn-off-film APP), apply 50 to 70 sq ft per gallon per ply, and keep material at least 60F for squeegee or trowel work. Prime masonry with JM Asphalt Primer and let it dry fully. If FM Global or UL approval is required, confirm specific application rates in RoofNav or the UL Certifications Directory.

Combustible and an eye, skin and respiratory irritant: apply only in well-ventilated areas, wear rubber gloves and impervious clothing, keep pails sealed and away from open flame, and consult the Safety Data Sheet before use.

Order the Johns Manville MBR Cold Application Adhesive 5-gallon pail for cold-process modified bitumen installations.