Manufacturer Varies by Location Fiberboard Cant Strip 4 in. Wide Beveled Roofing Transition Strip, 1 in. or 1-1/2 in. Heights

Fiberboard cant strips create a beveled 45-degree transition where a roof abuts a wall or curb, eliminating the sharp bend that can crack roofing membranes. Available in 1 in. x 4 in. and 1-1/2 in. x 4 in. brown fiberboard profiles, each strip is sold by the board (BD). Install under base flashing and tie-in details to smooth membrane transitions.

Key Features:

• Beveled profile: The angled face fills the corner between roof and wall so the roofing material is not forced into a sharp bend.
• Dimensionally stable: Manufactured fiberboard holds its shape in roof assemblies for a consistent transition detail.
• Recyclable material: The fiberboard is environmentally friendly and 100% recyclable.
• Easy to cut: Cuts cleanly with a utility knife, so field trimming around curbs and walls is fast.
• Two heights: Offered in 1 in. and 1-1/2 in. heights, both 4 in. wide, to match different membrane and flashing details.

Specifications Table:

Coverage & How Much You Need:

Coverage depends on the height and length of strip used; order boards in linear feet equal to the total run of walls, curbs and parapets requiring a beveled transition, allowing a small waste factor for cuts.

Fit and Compatibility:

Used beneath modified bitumen, built-up and single-ply base flashing details wherever the membrane turns up a wall or curb. Pair with the specified base sheet, membrane adhesive or mop-applied ply system and termination flashing for the roof assembly.

Frequently Asked Questions (FAQ):

Q: What is included in an order?
A: Each unit is one board (BD) of fiberboard cant strip in the selected size, 1 in. x 4 in. or 1-1/2 in. x 4 in., brown.

Q: How do I choose between 1 in. and 1-1/2 in. heights?
A: Match the cant size to the membrane manufacturer's flashing detail and the height of the transition; the 1-1/2 in. strip gives a gentler angle for thicker assemblies.

Q: How is it installed?
A: Place the beveled strip tight into the roof-to-wall angle before the base flashing or membrane is applied, fastening or adhering per the roofing system specification.

Q: Can I trim it on site?
A: Yes, the fiberboard cuts easily with a knife for fitting around corners, curbs and penetrations.

Q: Is it moisture sensitive?
A: Like all fiberboard products it should be stored dry and covered promptly by the roofing membrane; the manufacturer states the strip is dimensionally stable.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Cant strips are one of the cheapest insurance items on a commercial roof: without them, the membrane takes a sharp 90-degree bend at wall and curb intersections and is far more likely to split. Use the height your membrane system detail calls for and keep the strip tight to the substrate with no gaps behind it. Because it cuts with a knife, lay out curbs and corners first, then trim strips to fit before mopping or adhering the base ply.

Cut edges and roofing work at height both warrant care: use a sharp knife on a stable surface and follow fall-protection requirements when installing near parapets and walls.

Order fiberboard cant strip today to build smooth, membrane-friendly transitions at every wall and curb.