AP Foil-Faced Polyiso Foam Board, 1/2 x 4x8, R-2.9

Rigid polyisocyanurate foam board with reflective foil facer delivers high thermal performance in a lightweight, easy-to-cut panel. Designed for continuous insulation, it helps control heat, moisture, and air in walls, basements, crawl spaces, and ceilings.

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Key Features:

• High R-Value Efficiency: Delivers R-2.9 at 1/2 in. thickness with up to R-6 per inch for space-saving thermal performance
• Multi-Barrier Protection: When installed correctly, functions as water-resistive, vapor, and air barrier to reduce drafts and moisture
• Reflective Foil Facers: One reflective side to face the warm air surface; opposite side is white non-reflective for interior orientation
• Lightweight, Easy Install: Simple to score and snap or cut with a utility knife; suitable for residential and Type I–IV commercial uses
• Low Permeability & Fire Performance: Foil facing helps control condensation; thermoset polyiso stays intact during fire exposure (ASTM E84)

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Specifications Table:

Specification	Details
Series Name	AP Foil
Insulation Type	Polyisocyanurate (polyiso) rigid foam board
Faced/Unfaced	Foil-faced (one reflective, one white)
Actual Thickness (Inches)	0.5
Actual Width (Feet)	4
Actual Length (Feet)	8
Coverage Area	32 sq ft per board
R-Value (Board)	R-2.9
R-Value per Inch	6
Use Location	Indoor
For Use in Walls	Yes
For Use in Ceilings	Yes
For Use in Basements	Yes
For Use in Crawlspaces	Yes
Fits 2 x 4 Walls	Yes
Fits 2 x 6 Walls	Yes
Water Resistant	No
Vapor Retardant	Yes
Mold Resistant	No
Sound Barrier	No
Formaldehyde Free	Yes
ENERGY STAR Certified	Yes
GREENGUARD Gold Certified	Yes
Fire Performance	Thermoset material remains intact during fire exposure (ASTM E84)
Package Quantity	1
Package Weight (lbs.)	3.21
Warranty	20-year limited

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Frequently Asked Questions (FAQ):

Q: What are the panel dimensions and coverage?
A: Each board is 1/2 in thick by 4 ft by 8 ft and covers 32 sq ft.

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Q: Which way should the foil face during installation?
A: In most applications, the reflective foil side faces the warm air/exterior and the white non-reflective side faces the interior; follow local codes and cladding exceptions.

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Q: Can this act as an air or vapor barrier?
A: Yes. When properly installed, AP Foil-Faced Polyiso functions as a water-resistive, vapor, and air barrier.

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Q: Is it easy to cut and handle?
A: Yes. The lightweight board can be cut with a utility knife or saw for quick fitting.

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Q: What certifications does it carry?
A: GREENGUARD Gold and ENERGY STAR certified; formaldehyde-free with a 20-year limited warranty.

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Sleek, Space-Saving Thermal Armor

This foil-faced board wraps your envelope in a crisp, architectural sheen while quietly elevating comfort. The reflective facer becomes a modern, minimal layer that bounces warmth where you want it most. Pair it behind clean-lined cladding or gypsum for an efficient, tailored shell. It’s the smart, elegant essential for a luxe, well-insulated sanctuary.

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Upgrade your envelope with AP Foil-Faced Polyiso and get high R-value performance in a slim, easy-to-install board—add it to your project today.