AP Foil-Faced Polyiso Board Insulation, 0.5-in x 4x8, R-2.9

Rigid polyisocyanurate foam sheathing with foil facer delivers high thermal performance and air, vapor, and water-resistive barrier functions when properly installed. Ideal as continuous exterior insulation for above-grade walls and various residential and commercial applications.

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Key Features:

• High R-Value per Inch: Polyiso core provides R-2.9 at 0.5-in thickness (R-6 per inch) for efficient thermal control
• Dual Foil Facers: Reflective exterior foil and white interior foil enhance energy performance and installation orientation
• Barrier Functions: When properly installed, acts as water-resistive barrier, vapor barrier, and air barrier
• Lightweight & Easy to Cut: Handles easily and can be cut with a utility knife or saw for quick installs
• Low Permeability & Fire Performance: Helps control condensation and remains intact during fire exposure (ASTM E84)

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Specifications Table:

Specification	Details
Series Name	AP Foil
Actual Length (Feet)	8
Actual Thickness (Inches)	0.5
Actual Width (Feet)	4
Common Length (Feet)	8
Common Thickness (Inches)	0.5
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	2.9
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

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Frequently Asked Questions (FAQ):

Q: Can this be used as continuous exterior insulation on residential walls?
A: Yes—AP Foil-Faced Polyiso is designed for use as insulated sheathing and continuous exterior insulation on above-grade walls.

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Q: Which side faces outward during installation?
A: In most applications, install the reflective foil side toward the exterior and the white non-reflective side toward the interior.

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Q: Does this product function as an air or vapor barrier?
A: When properly installed, it serves as an air barrier and vapor barrier, and also as a water-resistive barrier.

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Q: How do I cut and handle the boards?
A: The lightweight boards can be cut with a utility knife or saw for straightforward handling and fitting.

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Q: Is it environmentally friendly?
A: It’s produced with an EPA-compliant blowing agent with zero ODP and virtually no GWP, and meets CFC- and HCFC-free requirements.

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Sleek Thermal Shield for Modern Envelopes

This foil-faced panel brings an architectural crispness to wall assemblies, creating a seamless, polished envelope that heightens energy performance. The reflective surface is a standout—clean, modern, and purposeful—sending warmth back where you want it. Use it as continuous exterior insulation to streamline façades and reduce thermal bridging. It’s a quiet luxury upgrade that makes homes feel smarter, tighter, and undeniably refined.

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Upgrade your envelope with JM AP Foil-Faced Polyiso and lock in efficient, code-ready performance today.