Skip to content
IKO IKOTherm Tapered Grade-II (20 psi) Polyiso Roof Insulation Board, 4 ft x 4 ft, 2 in to 2.5 in
Regular price $26.75Orders start at $399 — combine any items to reach the minimum. Learn more
IKO IKOTherm Tapered Grade-II (20 psi) Polyiso Roof Insulation Board, 4 ft x 4 ft, 2 in to 2.5 in
This is an IKO IKOTherm tapered polyisocyanurate roof insulation board in 4 ft x 4 ft size, Grade-II (20 psi), taper profile (C) 2 in to 2.5 in, with a tan kraft facer. It is sold by the piece and is designed for use in modified bitumen, built-up and single-ply roof systems where positive slope and drainage are required. Order by the board to build up a tapered insulation system.
Key Features:
- Positive drainage: Tapered profile (C) 2 in to 2.5 in provides sloping to help direct water off existing and new roof structures.
- High thermal value: Rigid polyisocyanurate foam with high thermal properties offers superior R-value and outstanding dimensional stability.
- Reinforced facer: Select kraft paper facer reinforced with fiberglass strands provides high strength and excellent absorption.
- Flexible attachment: Designed for hot mopping and adhesive attachment methods, and also performs well with mechanical fasteners.
- Lightweight handling: Strong, lightweight 4 ft x 4 ft boards are easy to handle and stage on the roof.
- Listed and approved: Meets ASTM C1289 and CAN/ULC S-704, and is FM Approved and UL Classified.
- Energy savings: Rigid foam insulation helps reduce heating and cooling costs in the roof assembly.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | IKO |
| Manufacturer model | 4183409 |
| Sell unit | 1 board, 4 ft x 4 ft, taper (C) 2 in to 2.5 in |
| Product line | IKOTherm Tapered Commercial Roof Insulation |
| Profile / style | Tapered, Grade-II (20 psi), taper profile (C) 2 in to 2.5 in |
| Color | Tan |
| Dimensions | 4 ft x 4 ft, 2 in to 2.5 in thick |
| Material | Polyisocyanurate foam with kraft paper facer reinforced with fiberglass strands |
| Applicable standards | ASTM C1289; CAN/ULC S-704; FM Approved; UL Classified |
| Compressive strength | Grade-II (20 psi) |
| Intended use | Tapered roof insulation for modified bitumen, built-up and single-ply roof systems |
| Attachment methods | Hot mopping, adhesive, or mechanical fasteners |
| Algae resistance | No |
| Product weight, complete sell unit | 6 lb |
Coverage & How Much You Need:
Each 4 ft x 4 ft board covers 16 sq ft of roof area at the installed orientation. Calculate the number of boards from the roof plan and the tapered-system layout; average board thickness determines the board quantity per pallet.
Fit and Compatibility:
IKOTherm Tapered Insulation is designed to be part of modified bitumen, built-up or single-ply roof systems where slope is dictated by the roof design. Attachment materials (hot asphalt, insulation adhesive, fasteners) and the roof membrane are supplied separately.
Frequently Asked Questions (FAQ):
Q: What is included in one order unit?
A: One 4 ft x 4 ft tapered polyiso board, taper profile (C) 2 in to 2.5 in, Grade-II (20 psi).
Q: How much area does one board cover?
A: One 4 ft x 4 ft board covers 16 sq ft; divide the roof area by 16 sq ft per board to size the job.
Q: How is it attached?
A: The kraft-fiberglass facer accepts hot mopping and adhesive attachment methods, and the board also performs well with mechanical fasteners.
Q: What roof systems does it work with?
A: It is designed for modified bitumen, built-up and single-ply roof systems where slope is dictated by the roof design.
Q: What approvals does it carry?
A: It meets ASTM C1289 and CAN/ULC S-704 and is FM Approved and UL Classified.
Q: Is the board a standard thickness?
A: No, this item is a tapered board running 2 in to 2.5 in; tapered systems are supplied by pallet in a variety of slopes.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Tapered polyiso is chosen by thickness at the low and high ends of the panel; confirm this (C) 2 in to 2.5 in taper matches the project slope plan before ordering, since board quantity per pallet varies with average thickness. Design the tapered layout so crickets and slopes achieve positive drainage per the roof design, and attach per the membrane manufacturer's instructions using compatible asphalt, adhesive or fasteners. Pair with an IKO or compatible system cover board or directly under the membrane where the assembly allows.
Rigid foam insulation boards must be secured against wind uplift before the membrane is installed; follow the attachment method specified by the project's approved roof assembly.
Order the IKO IKOTherm Tapered Grade-II polyiso board today to build slope and insulation into your roof system.
All third party trademarks, including logos and icons, referenced on our website and product pages remain the property of their respective owners. Unless specifically identified as such, Arbor's use of third party trademarks does not indicate any relationship, affiliation, sponsorship, or endorsement between Arbor Home and the owners of these trademarks. Any references by Arbor Home to third party trademarks are to identify the corresponding third party goods.
