Owens Corning FOAMULAR 400 R-10 XPS Foam Board Insulation, 2 in x 4 ft x 8 ft, Square Edge (40 psi)FOAMULAR 400 R 10 XPS Foam Board, 2" x 4' x 8' High performance extruded polystyrene (XPS) insulation board with 40 psi compressive strength for heavy load applications. Offers R 10 thermal resistance at 2 inch thickness and square edges for flush installs. Key Features: High Compressive Strength: 40 psi for under slab, foundation, and commercial roof applications Energy Efficient: R 10 thermal resistance at 2 inch thickness helps reduce heat loss

FOAMULAR 400 R-10 XPS Foam Board, 2" x 4' x 8'

High-performance extruded polystyrene (XPS) insulation board with 40 psi compressive strength for heavy-load applications. Offers R-10 thermal resistance at 2-inch thickness and square edges for flush installs.

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Key Features:

• High Compressive Strength: 40 psi for under-slab, foundation, and commercial roof applications
• Energy Efficient: R-10 thermal resistance at 2-inch thickness helps reduce heat loss
• Moisture Resistant: XPS core retains R-value even in wet conditions
• Easy to Work With: Lightweight panels score, snap, and cut cleanly without special tools
• Sustainable NGX Formulation: Blowing agent designed to significantly reduce global warming potential

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Insulation Type	XPS Rigid Foam Board
Compressive Strength	40 psi (FOAMULAR 400)
R-Value	R-10
Thickness	2 in
Width	48 in
Length	8 ft
Coverage Area	32 sq ft per board
Compatible Install Surface	Concrete, Plywood, Wood
Faced or Unfaced	Unfaced
Insulation Location	Exterior sheathing, exterior wall foundation, under slab
Interior/Exterior	Exterior (must be covered if used indoors)
Number of Pieces	1
Pack Size	1
Product Weight	10 lb
Warranty	Limited Lifetime
Features	Formaldehyde-free; Moisture retardant; Mold resistant; Water resistant
Edge Type	Square Edge
Material	Extruded Polystyrene (XPS)

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Frequently Asked Questions (FAQ):

Q: Can this board be used below grade or under slabs?
A: Yes—commonly used for exterior foundation walls and under-slab applications due to its 40 psi compressive strength and moisture resistance.

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Q: Does it need to be covered indoors?
A: Yes—XPS foam cannot be left exposed and must be covered by a 15-minute thermal barrier such as drywall when used indoors.

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Q: What surfaces is it compatible with?
A: Concrete, wood, and plywood.

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

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Q: What are the panel dimensions and coverage?
A: Each board is 2 in thick, 48 in wide, and 8 ft long, covering 32 sq ft.

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Sculpted Strength, Modern Warmth

This XPS board brings precision and pink-hued confidence to high-performance builds. Its crisp square edge and slim 2-inch profile glide into tight assemblies, delivering steadfast insulation without bulk. Use it to create a clean, continuous thermal layer behind cladding or beneath polished concrete for a seamless envelope. It’s a quiet essential—powerfully functional and undeniably refined.

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Upgrade your envelope with FOAMULAR 400 and lock in durable, R-10 energy savings for your next project.

Warranty

Installation