3 in. Polyiso Roof Insulation Board (4x8)

Closed-cell polyisocyanurate roof insulation with fiber-reinforced organic felt facers for superior thermal performance. The 3-inch ACFoam-II board delivers high LTTR values and is sized 4 ft. x 8 ft. for efficient coverage on commercial and residential flat roofs.

Key Features:

• High Thermal Efficiency: Closed-cell polyiso core provides strong long-term thermal resistance (LTTR).
• Durable Facers: Non-asphaltic, fiber-reinforced organic felt facers add strength and stability.
• Code Compliant: Meets ASTM C1289 and multiple UL/FM standards; Miami-Dade and Florida approvals.
• Versatile Application: Suitable for a range of low-slope roofing systems and assemblies.
• Large Coverage: 4 ft. x 8 ft. boards streamline installation across wide roof areas.

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What are the board dimensions and thickness?
A: Each board measures 4 ft. x 8 ft. with a 3 in. thickness.

Q: What is the core material?
A: Closed-cell polyisocyanurate (polyiso) foam.

Q: What type of facers are used?
A: Non-asphaltic, fiber-reinforced organic felt facers.

Q: Which standards and approvals does it meet?
A: ASTM C1289; CAN/ULC-S704; multiple UL standards (1256, 790, 263, 1897); FM 4450/4470; Miami-Dade and Florida Product Approvals; UL Greenguard Gold, among others.

Q: How much area does a unit cover?
A: 512 sq. ft. per unit.

Sculpted Warmth for Modern Rooflines

This polyiso board brings a refined practicality to the building envelope, wrapping your structure in quiet, confident performance. The felt-faced surface feels tailored, a sleek layer that elevates the craft of a low-slope roof. Pair it with a clean, monochrome membrane and crisp metal edges for an architectural, gallery-like finish. It’s the discreet luxury that keeps interiors serene and energy-savvy.

Insulate smarter—choose Atlas ACFoam‑II for high LTTR performance and code-ready reliability on your next roofing project.

Warranty