Johns Manville FesCant Plus Cant Strips 1 in. x 3 in. or 4 in. x 4 ft. Perlite Cant Board

Johns Manville FesCant Plus Cant Strips are high-density laminated cant boards made from expanded perlite and reinforcing cellulosic fibers, used to create a smooth transition from the roof deck to the wall. The line is offered in 1 in. x 3 in. x 4 ft. and 1 in. x 4 in. x 4 ft. brown strips, sold per board or piece. Pair them with compatible JM roof insulation and membrane systems.

Key Features:

• High-density perlite board: Manufactured from JM Cant Board, a high-density laminated perlite board designed for deck-to-wall transitions.
• Stable insulation value: Expanded perlite provides good dimensional stability and excellent insulation value with stable R-value.
• Enhanced fire resistance: The high perlite content offers far greater fire resistance than conventional wood fiber materials.
• Recycled fiber content: Reinforcing cellulosic fibers consist of recycled newsprint that adds strength and high recycled content.
• Third-party certified: Recycled content is certified by UL Environment and contributes to LEED Materials credits.
• Two size options: Available in 1 in. x 3 in. x 4 ft. and 1 in. x 4 in. x 4 ft. profiles in brown.

Specifications Table:

Coverage & How Much You Need:

Each 4 ft. strip covers 4 linear feet of deck-to-wall transition. Measure the total linear footage of the parapet or wall junction and divide by 4 to determine how many strips to order, choosing the 3 in. or 4 in. face to match the cant angle needed.

Fit and Compatibility:

Designed for use with JM low-slope roofing assemblies at the deck-to-wall transition, alongside JM Cant Board products such as Tapered FESCO Edge Strip. Membrane, insulation and fastening accessories are sold separately.

Frequently Asked Questions (FAQ):

Q: What is included in one sell unit?
A: One 4 ft. cant strip, either 1 in. x 3 in. or 1 in. x 4 in., in brown; order the quantity needed for your transition length.

Q: Which size should I choose?
A: Choose the 3 in. or 4 in. face width based on the cant angle and detail required where the deck meets the wall or parapet.

Q: Is this fire resistant?
A: Yes, the high expanded perlite content provides far greater fire resistance than conventional wood fiber cant materials.

Q: Does it contribute to LEED points?
A: The recycled newsprint content is third-party certified by UL Environment and contributes to LEED Materials credits.

Q: How do I install cant strips?
A: Set the strips along the deck-to-wall junction before membrane or insulation is applied, fitting them tightly at the transition.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Perlite cant strips are the standard choice at parapets and walls because the 45-degree cant eliminates the sharp deck-to-wall angle where membrane stress concentrates. Choose the 4 in. face for most standard cant details and the 3 in. face where the detail calls for it. Install them tight and continuous before the field insulation and membrane go in, and keep them dry until covered.

Wear gloves and eye protection when handling and cutting perlite board; edges and dust can be abrasive.

Order Johns Manville FesCant Plus Cant Strips today for a durable deck-to-wall transition on your commercial roof.