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GAF EnergyGuard Ultra 2.5 in. x 4 ft x 8 ft Grade-III (25 psi) Tapered Polyiso Roof Insulation Panel
Regular price $48.91Orders start at $399 — combine any items to reach the minimum. Learn more
GAF EnergyGuard Ultra 2.5 in. x 4 ft x 8 ft Grade-III (25 psi) Tapered Polyiso Roof Insulation Panel
This is a GAF EnergyGuard Ultra tapered polyiso roof insulation panel, 2.5 in. thick in a 4 ft x 8 ft sheet, Grade-III at 25 psi. It provides slope on low-slope commercial roofs so water drains toward drains and scuppers. Sold per piece; 19 pieces per bundle with 608 sq ft of bundle coverage.
Key Features:
- High compressive strength: Grade-III panel meets ASTM C1289 Type II, Class 2, Grade 3 (25 psi).
- Drains ponding water: Tapered EnergyGuard systems help drive water to the drain on low-slope roofs, prolonging roof life.
- Moisture-resistant facer: Coated glass facer (CGF) offers improved moisture properties and a more durable surface than GRF facers.
- Mold resistant: Meets the requirements of ASTM D3273 for resistance to mold growth.
- Easy to install: Lightweight polyiso is easy to cut in the field, making handling and installation more efficient.
- Broad approvals: FM Approved (4450, 4470), UL Classified (1256, 790, 264, ER 1306-03), Miami-Dade County and State of Florida Approved.
- Green building credit: Product contributes to green building rating systems.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | GAF |
| Sell unit | 1 panel, 2.5 in. x 4 ft x 8 ft (19 pieces per bundle, 608 sq ft per bundle) |
| Product line | GAF EnergyGuard Ultra Tapered Polyiso Insulation |
| Material | Polyisocyanurate foam core with coated glass facers (CGF) |
| Dimensions | 4 ft x 8 ft, 2.5 in. thick |
| Thickness | 2.5 in. |
| Coverage per unit | 608 sq ft per 19-piece bundle (32 sq ft per panel) |
| Compressive strength | Grade III, 25 psi |
| Applicable standards | ASTM C1289 Type II; FM Approved; UL Classified; Florida Building Code; Miami-Dade County Approved; PIMA Quality Mark; ASTM D1621, D2126, C209, E96, E84 |
| Mold resistance | Meets ASTM D3273 requirements |
| Facer | Coated glass facer (CGF) |
| Pack quantity | 19 pieces per bundle |
| Intended use | Sloped roof insulation for low-slope commercial roofing systems |
| Product weight, complete sell unit | 16.096 lb |
Coverage & How Much You Need:
Each 4 ft x 8 ft panel covers 32 sq ft; the 19-piece bundle covers 608 sq ft as listed for this item. For a full tapered system, slope per foot and layout must be designed for the specific roof.
Fit and Compatibility:
Designed for use in GAF tapered insulation systems on low-slope commercial roofs, installed under GAF-approved single-ply membrane systems. Slope designation, tapered layout, and GAF Tapered Design Group support are available for complete system design.
Frequently Asked Questions (FAQ):
Q: What is included in one order unit?
A: One polyiso insulation panel, 2.5 in. thick and 4 ft x 8 ft. Bundles ship 19 pieces per bundle covering 608 sq ft.
Q: What does Grade-III (25 psi) mean?
A: It is the panel's compressive strength classification under ASTM C1289, Type II, Class 2, Grade 3, rated at 25 psi.
Q: How does tapered insulation work?
A: Tapered panels slope the roof surface so water flows to drains, helping eliminate ponding water on low-slope roofs.
Q: Can I cut the panel on site?
A: Yes. GAF states the lightweight panels are easy to cut in the field for efficient installation.
Q: Is it mold resistant?
A: Yes, it meets the requirements of ASTM D3273 for resistance to mold growth, and the CGF facer offers improved moisture properties.
Q: What approvals does it carry?
A: FM Approved, UL Classified, Miami-Dade County Approved, State of Florida Approved, and it carries the PIMA Quality Mark.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Match this Grade-III 25 psi panel to roof assemblies that call for higher compressive strength, such as areas under heavy membrane traffic or ballast. Tapered systems should be engineered panel by panel; GAF's Tapered Design Group can supply layout and slope design at no stated charge. Install per GAF specifications over an approved deck or base layer, with staggered joints, and verify code-required R-value for your state before ordering.
Handle large foam panels carefully in wind, and wear eye protection and cut-resistant gloves when field-cutting polyiso.
Order the GAF EnergyGuard Ultra 2.5 in. tapered polyiso insulation panel to build slope and thermal value into your low-slope roof system.
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