SKU: 39896880911

Owens Corning FOAMULAR 400 R-10 XPS Foam Board Insulation, 2 in x 4 ft x 8 ft, Square Edge (40 psi)

Sale price$61.66 Regular price$68.51
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Description

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.


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


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)

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.


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.


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


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


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.


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.


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

Warranty

Installation

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 39896880911

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Pat Belanger
New York, US
★★★★★ 5
Best fit!
Flavor Name: XL silicone socks 2 pairs
Search no further, these are the BEST! They are smazing at conforming to the shape of your feet. They fit snuggly with no sags/bags or uncomfortable pressure or squeezing of your toes.
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Reviewed in the United States on March 8, 2025
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Tasha U
Carnegie, US
★★★★★ 4
Helps dry, cracked feet
Flavor Name: XL silicone socks 2 pairs
We use these on my husband’s cracked feet in the winter and put on a thick cream under these socks. They are nice because hair, dirt and that kind of stuff doesn’t stick to the outside. I do wish them came in more sizes and colors. They were a little small for my husband, but still worked good enough. My husband isn’t thrilled about wearing pink socks around the house. At least it’s just around the house and not out in public though.
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Reviewed in the United States on March 6, 2025
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KB
Boise, US
★★★★★ 5
Be aware! Once they are on, do not walk! 😂
Flavor Name: XL silicone socks 2 pairs
I absolutely love these things. But the first time I put them on in the living room. The walk to my bedroom was VERY interesting 😂😂😂 I now know I need to put them on and hang out for a bit, or simply go to bed. They do exactly what I need them to do. Feet feel great afterwards! With the right lotion, only need to use one every couple of weeks.
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Reviewed in the United States on January 10, 2025
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Marti
Grantham, US
★★★★★ 5
Transformed my feet
Flavor Name: XL silicone socks 2 pairs
After trying several other brands that actually my size did not have the luxury feeling of these. T although x large they have the BEST feel and function. I put lotion on then slip them on and within a few minutes my dry cracked heals are soft. Really a nice product.
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Reviewed in the United States on July 24, 2024
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Tina Taylor
Chelsea, US
★★★★★ 3
Ok
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Reviewed in the United States on March 6, 2026

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