Owens Corning R-15 (40 PSI) FOAMULAR NGX 400 Extruded Polystyrene Foam Board Insulation, 3 in x 4 ft x 8 ft, Square Edge

Regular price $191.50

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FOAMULAR NGX 400 R-15 XPS Foam Board, 3 in x 4 ft x 8 ft

High-performance extruded polystyrene (XPS) foam board delivering R-15 thermal resistance in a 3-inch panel. Engineered for moisture resistance and durability with 40 PSI compressive strength, ideal for walls, sheathing, and commercial applications.


Key Features:

  • High R-Value: R-5 per inch delivers R-15 in a 3-inch panel for energy efficiency
  • Moisture Resistant: Low water absorption helps retain R-value in damp conditions
  • Strong & Lightweight: 40 PSI compressive strength; easy to cut and install
  • Versatile Use: Suitable for exterior and interior foundation walls, exterior sheathing, cavity walls, and commercial applications
  • Sustainable Blowing Agent: NGX technology reduces global warming potential vs. legacy XPS

Specifications Table:

Specification Details
Series Name FOAMULAR NGX F-400
Actual Length (Feet) 8
Actual Thickness (Inches) 3
Actual Width (Feet) 4
Coverage Area (Sq. Feet) 32
Compressive Strength 40 PSI
Faced/Unfaced Unfaced
Insulation Type Polystyrene (XPS)
Maximum R-Value 15
R-Value per Inch 5
Mold Resistant Yes
Water Resistant Yes
Fire Resistant No
Sound Barrier No
Use Location Outdoor
For Use in Walls Yes
For Use on Wood Yes
Formaldehyde Free Yes
ENERGY STAR Certified Yes
GREENGUARD Gold Certified Yes
Warranty Limited lifetime
Package Quantity 1
Package Weight (lbs.) 15.1

Frequently Asked Questions (FAQ):

Q: Can this insulation be used on exterior sheathing?
A: Yes, it is suitable for exterior sheathing, foundation walls, cavity walls, and commercial applications.


Q: Is the board faced or unfaced?
A: Unfaced XPS foam board.


Q: What is the R-value per inch?
A: R-5 per inch; the 3-inch panel provides R-15.


Q: Does it resist mold and mildew?
A: Yes, it is mold/mildew resistant with excellent moisture resistance.


Q: Is special tooling required to cut it?
A: No, panels are lightweight and easy to cut with standard tools.


Sculptural Warmth Meets Industrial Strength

This sleek pink board brings modern performance to the envelope of your home, streamlining thermal comfort with a polished, architectural presence. The squared edges and 3-inch profile create crisp lines that layer beautifully behind cladding, supporting a clean, tailored aesthetic. Style it as continuous exterior insulation to elevate energy efficiency and reduce thermal bridging—smart luxury you can feel. A refined essential for resilient, high-design living.


Upgrade your envelope with FOAMULAR NGX 400 and lock in R-15 performance—add to cart today.

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