Owens Corning FOAMULAR 250 (25 psi) R-20 XPS Foam Board Insulation, 4 in. x 4 ft. x 8 ft., Square EdgeFOAMULAR 250 R 20 XPS Foam Board, 4x4x8, Square Edge High performance extruded polystyrene (XPS) rigid foam board delivering R 20 thermal resistance in a 4 in. thickness. Designed for interior exterior walls, foundations, and sheathing, it offers 25 psi compressive strength with excellent moisture resistance and easy score and snap installation. Key Features: High R Value: R 20 thermal resistance at 4 in. thickness for strong energy savings Durable

FOAMULAR 250 R-20 XPS Foam Board, 4x4x8, Square Edge

High-performance extruded polystyrene (XPS) rigid foam board delivering R-20 thermal resistance in a 4 in. thickness. Designed for interior/exterior walls, foundations, and sheathing, it offers 25 psi compressive strength with excellent moisture resistance and easy score-and-snap installation.

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Key Features:

• High R-Value: R-20 thermal resistance at 4 in. thickness for strong energy savings
• Durable Strength: 25 psi compressive strength handles foundation and wall loads
• Moisture Resistant: XPS core resists water absorption to help maintain R-value
• Easy to Work With: Lightweight board scores and snaps cleanly for quick installs
• Versatile Use: Suitable for basements, exterior sheathing, cavity walls, and below slabs

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Insulation Type	XPS Rigid Foam Board (Extruded Polystyrene)
Series	FOAMULAR NGX 250
Compressive Strength	25 psi
R-Value	R-20
Thickness	4 in.
Width	48 in.
Length	8 ft (96 in.)
Coverage Area	32 sq ft per board
Edge Profile	Square Edge
Faced or Unfaced	Unfaced
Compatible Install Surface	Concrete, Plywood, Wood
Interior/Exterior	Interior/Exterior
Insulation Location	Basement, Exterior Sheathing, Interior Wall; Below slabs; Crawl spaces
Insulation Features	Formaldehyde Free, Moisture Retardant, Mold Resistant, Water Resistant
Number of Pieces	1
Pack Size	1
Product Weight (lb.)	18 lb
Warranty	Limited Lifetime
Environmental Note	>80% reduction in global warming potential vs. legacy FOAMULAR; HFC‑134a eliminated
Certifications	GREENGUARD Certified; Listed in ENERGY STAR Seals and Insulates program

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Frequently Asked Questions (FAQ):

Q: Can this foam board be used below grade or under slabs?
A: Yes. It is suitable for foundation walls, basements/crawl spaces, and below slabs; check local codes for required coverings and vapor control.

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

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

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Q: What are the board dimensions and coverage?
A: Each board is 4 in. thick, 48 in. wide, and 8 ft. long, covering 32 sq. ft.

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Q: What is the environmental profile of NGX?
A: Manufactured with a next‑generation blowing agent with >80–90% reduction in global warming potential versus legacy FOAMULAR formulations.

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Sculpted Thermal Armor in Signature Pink

This sleek, square‑edge XPS panel wraps a space in quiet confidence, delivering crisp lines and a flush fit that feels thoughtfully engineered. I love the bold pink surface—an unexpected pop during construction that signals performance and polish. Layer it behind refined cladding or concrete to create a home that’s warm, dry, and impeccably detailed. It’s a discreet essential—practical luxury that underpins elevated living.

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Upgrade your envelope with FOAMULAR 250 and lock in long‑lasting R‑20 performance—add it to your project today.

Warranty

Installation