Atlas ACFoam-III Tapered Polyiso Roof Insulation, Grade-III 25 psi, 4 ft x 4 ft, 1-1/4 in to 1-1/2 inAtlas Tapered Polyiso Roof Insulation, Grade III (25 psi) Closed cell polyisocyanurate roof insulation board with inorganic coated glass facers for tapered applications. Designed to promote positive drainage while delivering long term thermal resistance (LTTR) in commercial or residential roofing systems. Key Features: Tapered Design: Factory tapered panels help achieve positive roof drainage and reduce ponding water Durable Construction: Closed cell

Atlas Tapered Polyiso Roof Insulation, Grade-III (25 psi)

Closed-cell polyisocyanurate roof insulation board with inorganic coated glass facers for tapered applications. Designed to promote positive drainage while delivering long-term thermal resistance (LTTR) in commercial or residential roofing systems.

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Key Features:

• Tapered Design: Factory-tapered panels help achieve positive roof drainage and reduce ponding water
• Durable Construction: Closed-cell polyiso core bonded to inorganic coated glass facers for strength and moisture resistance
• High Compressive Strength: Grade-III 25 psi rating supports foot traffic and roof assemblies
• Thermal Performance: Delivers reliable long-term thermal resistance (LTTR) to improve energy efficiency
• Convenient Size: 4' x 4' panels; thickness ranges from 1-1/4" to 1-1/2" for smooth transitions

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Specifications Table:

Specification	Details
Product Type	Tapered polyisocyanurate (polyiso) roof insulation
Brand	Atlas
Model / Series	ACFoam-III
Grade / Compressive Strength	Grade-III, 25 psi
Panel Size	4' x 4' (1220 mm x 1220 mm)
Thickness Range	1-1/4" to 1-1/2"
Core	Closed-cell polyiso foam
Facers	Inorganic coated glass facers
Coverage	608 sq. ft. per unit
Unit of Measure	PC
Applicable Standards / Approvals	ASTM C1289; CAN/ULC-S704; CCMC No. 12423-L; UL Certified for Canada; UL 1256; UL 790 (ASTM E108); UL 263 (ASTM E119); UL 1897; FM 4450/4470 Approved; IBC Chapter 26 & NBC; California State; Miami-Dade County Approved; Florida Product Approved; Greenguard Certified; RCI Approved; NRCA Approved; AIA Approved; U.S. Green Building Council Member
Length	4' (1220 mm)
Width	4' (1220 mm)
Style	Polyiso
Manufacturer Number	TP2_25PSI_00
Product Number	ATLT2G3

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Frequently Asked Questions (FAQ):

Q: What is the compressive strength rating?
A: This Grade-III panel is rated at 25 psi, suitable for many commercial roof assemblies.

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Q: What are the panel dimensions and thickness range?
A: Each panel is 4 ft x 4 ft with a thickness taper from 1-1/4 in to 1-1/2 in.

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Q: Is this product compatible with common roofing systems?
A: Yes. It is widely approved and listed under standards such as ASTM C1289, UL, FM 4450/4470, and others—verify specific assembly requirements in the product data sheet.

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Q: What facers does it use?
A: It features inorganic coated glass facers bonded to a closed-cell polyiso core.

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Q: How much area does a unit cover?
A: 608 square feet per unit, per the product listing.

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Sculpted Insulation for Sleek, High-Performance Rooflines

This tapered polyiso board shapes a roof with intention, guiding water elegantly while preserving the clean geometry of the plane. The coated glass facers offer a refined, durable skin that partners beautifully with premium membranes. Use it to create subtle transitions that disappear to the eye yet elevate performance. It’s a quiet luxury—smart, resilient insulation that underpins sophisticated architecture.

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Elevate your roof’s performance and drainage with Atlas ACFoam-III tapered polyiso—add it to your project today.

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