AP Foil R-13 Polyiso Foam Board Insulation, 2-in x 4-ft x 8-ft

Rigid polyisocyanurate foam board with foil facings delivers high thermal performance for continuous exterior or interior insulation. At 2 inches thick, it provides R-13 and helps control heat, moisture, and air for more energy-efficient walls and ceilings.

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Key Features:

• High R-Value per Inch: Polyiso delivers R-6 per inch; 2-in board provides R-13 for efficient thermal control
• Dual Foil Facings: Reflective exterior face and white interior face optimize energy reflection and installation orientation
• Air/Vapor/WRB Function: When properly installed, serves as water-resistive, vapor, and air barrier to reduce extra layers
• Easy to Handle: Lightweight board cuts with a utility knife or saw for fast installs in walls, attics, basements, and ceilings
• Fire Performance: Thermoset material stays intact during fire exposure (ASTM E84) compared to other rigid foam boards

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Specifications Table:

Specification	Details
Series Name	AP Foil
Actual Length (Feet)	8
Actual Thickness (Inches)	2
Actual Width (Feet)	4
Common Length (Feet)	8
Common Thickness (Inches)	2
Common Width (Feet)	4
Coverage Area (Sq. Feet)	32
Faced/Unfaced	Faced
Fire Resistant	No
Fits 2 x 4 Walls	Yes
Fits 2 x 6 Walls	Yes
For Use in Attics	Yes
For Use in Basements	Yes
For Use in Ceilings	Yes
For Use in Crawlspaces	Yes
For Use in Doors	No
For Use in Duct	No
For Use in Electrical	No
For Use in Floors	No
For Use in Garage Doors	No
For Use in Masonry	No
For Use in Plumbing	No
For Use in Vents	No
For Use in Walls	Yes
For Use in Windows	No
For Use on Glass	No
For Use on Insulation	Yes
For Use on Metal	No
For Use on Plastic	No
For Use on Wood	Yes
Formaldehyde Free	Yes
Insulation Type	Polyisocyanurate
Maximum R-Value	13
Mold Resistant	No
Package Quantity	1
R-Value per Inch	6
Sound Barrier	No
Use Location	Indoor
Vapor Retardant	Yes
Water Resistant	No
ENERGY STAR Certified	Yes
GREENGUARD Gold Certified	Yes
Warranty	20-year limited
UNSPSC	30141500
Category	Insulated Sheathing

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Frequently Asked Questions (FAQ):

Q: Can this be used as continuous exterior insulation?
A: Yes—AP Foil-Faced Polyiso is designed for continuous insulation on above-grade exterior walls and can also be used on interior walls, attics, basements, and crawl spaces.

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Q: Which side should face outward during installation?
A: In most applications, install the reflective foil face toward the exterior and the white non‑reflective face toward the interior; follow siding exceptions noted by the manufacturer.

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Q: What is the R-value of this 2-in board?
A: R-13 (polyiso provides approximately R-6 per inch).

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Q: Does it act as a vapor or air barrier?
A: When properly installed, it functions as a water-resistive barrier, vapor barrier, and air barrier.

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Q: Is it lightweight and easy to cut?
A: Yes, it’s lightweight and can be cut with a utility knife or saw.

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Sleek, High-Performance Sheathing for Modern Envelopes

This foil-faced board introduces a clean, architectural surface while quietly supercharging thermal performance. The reflective face becomes a subtle design ally, channeling light and efficiency in tandem. Pair it with streamlined framing and dark cladding for a polished, high-contrast envelope. It’s a smart essential that elevates comfort and luxury through thoughtful building science.

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Upgrade your envelope with AP Foil R-13 today and enjoy immediate energy savings with professional-grade, easy-to-install insulation.