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InsulFoam 1# EPS Tapered Roof Insulation 4 ft. x 4 ft. Panels - Multiple Tapers
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InsulFoam 1# EPS Tapered Roof Insulation 4 ft. x 4 ft. Panels - Multiple Tapers
Insulfoam 1# EPS Tapered is 4 ft. x 4 ft. closed-cell expanded polystyrene roof insulation with a nominal 1.0 lb/ft3 density, cut in a range of taper profiles to create positive slope on low-slope roofs. This line spans tapers from 0 in. up to 10 in. across A and C profiles. Choose the taper series and panel thickness that match your slope plan.
Key Features:
- Closed-cell EPS: Superior closed-cell, lightweight expanded polystyrene insulation.
- Meets ASTM C578: Meets or exceeds ASTM C578, the standard for rigid cellular polystyrene thermal insulation.
- Stable R-value: Provides long-term, stable R-value with no thermal drift over its service life.
- Single-layer installs: Can be installed in a single layer for thicknesses up to 40 in., with no complicated filler panel systems.
- 1.0 lb/ft3 density: InsulFoam I has a nominal density of 1.0 lb/ft3.
- Cost-effective slope: Significantly more cost-effective than extruded polystyrene, perlite, and isocyanurate tapered systems.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Insulfoam |
| Sell unit | 1 panel, 4 ft. x 4 ft. |
| Product line | Insulfoam 1# EPS Tapered (InsulRoof Taper) |
| Product category | Commercial Roofing / Commercial Insulation / EPS |
| Available colors | Tan |
| Available sizes | 23 taper/thickness variants in 4 ft. x 4 ft. panels, from (A1) 0 in.-0.5 in. through (C10) 9 in.-10 in., including (A2) 0.5-1 in., (A4) 1.5-2 in., (C2) 1-2 in., (C4) 3-4 in., (C6) 5-6 in., (C8) 7-8 in. |
| Dimensions | 4 ft. x 4 ft. panels; thickness ranges vary by taper (e.g., C6: 5 in. to 6 in.) |
| Material | Expanded polystyrene (EPS), closed-cell |
| Coverage per unit | 16 sq. ft. per 4 ft. x 4 ft. panel |
| Density | Nominal 1.0 lb/ft3 (InsulFoam I) |
| Approvals | Meets or exceeds ASTM C578 |
| Max thickness single layer | Up to 40 in. |
| Intended use | Positive-slope roof insulation for new construction and re-roofing; addresses ponded water |
Coverage & How Much You Need:
Each 4 ft. x 4 ft. panel covers 16 sq. ft. of roof area. Divide the roof area by 16 sq. ft. per panel, then lay out the taper pattern so the low edge drains toward the designated drainage points.
Fit and Compatibility:
Works under approved low-slope roof membranes and assemblies; it is cut from the same EPS as Insulfoam's flat InsulFoam products, so flat boards can supplement the tapered field. Membrane, adhesives, and cover board are sold separately; confirm the taper layout with your roofing contractor.
Frequently Asked Questions (FAQ):
Q: What sizes are available?
A: The line includes 23 variants, all 4 ft. x 4 ft., spanning tapers from 0 in. to 0.5 in. (A1) up to 9 in. to 10 in. (C10), including both A-series quarter-inch steps and C-series 1-in. steps.
Q: How much does one panel cover?
A: A 4 ft. x 4 ft. panel covers 16 sq. ft.
Q: What density is this?
A: A nominal 1.0 lb/ft3 (InsulFoam I).
Q: Can it be installed in one layer?
A: Yes, InsulRoof Taper can be installed in a single layer for thicknesses up to 40 in. with no filler panel systems.
Q: Will the R-value drop over time?
A: No, its thermal properties remain stable over the entire service life with no thermal drift.
Q: Is it suitable for re-roofing?
A: Yes, it is designed for both new construction and re-roofing where positive slope is desired or ponded water is a concern.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Select the taper series based on the slope per foot you need: A-series tapers step in roughly half-inch increments while C-series step in full inches, all on 4 ft. panels. Lay out crickets and slopes so each panel run drains to scuppers or drains, and keep the thin edge at the drainage line. EPS panels are lightweight and easy to field-cut, but protect them from prolonged sun exposure before the membrane goes on.
Keep EPS away from open flame and hot work; polystyrene insulation is combustible and should be covered by the roof assembly promptly.
Order Insulfoam 1# EPS Tapered panels in your taper profile to build positive slope into your roof.
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