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Owens Corning FOAMULAR NGX F150 1 in. x 48 in. x 8 ft. R-5 XPS Rigid Foam Board Insulation

Owens Corning FOAMULAR NGX F150 1 in. x 48 in. x 8 ft. R-5 XPS Rigid Foam Board Insulation

Best price now

$33.35at Home DepotObserved at 3:10 PM

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Our take on the Owens Corning FOAMULAR NGX F150 1 in. x 48 in. x 8 ft. R-5 XPS Rigid Foam Board Insulation

FOAMULAR NGX F150 is Owens Corning's unfaced extruded polystyrene (XPS) board, sold here as a 1 in. x 4 ft. x 8 ft. panel rated R-5 over 32 sq ft. It is rigid, moisture resistant and mold resistant, and it can go on interior or exterior walls over wood or plywood. The 1 in. panel is the thin end of the FOAMULAR line, so it suits sheathing, rim joists and interior basement walls more than whole-house cavity fill. As of November 4, 2026, the best new price is $33.35 at Home Depot, the only store listing it, which works out to about $1.04 per sq ft.

Best forBasement and crawl space wall insulationExterior sheathing over wood or plywoodRim joists and band boardsFilling gaps where a thin, rigid board fits
Pros
  • R-5 in just 1 in. of thickness
  • Unfaced board is easy to cut and stack
  • Moisture and mold resistant for damp areas
  • Works indoors and outdoors over wood or plywood
  • Formaldehyde free
Cons
  • R-5 is low for the price per square foot
  • Unfaced, so it is not a vapor barrier on its own
  • XPS is flammable and needs code-required coverings indoors
  • Not rated for sound blocking
  • Only one store lists it, so price competition is thin

Owens Corning FOAMULAR NGX F150 1 in. x 48 in. x 8 ft. R-5 XPS Rigid Foam Board Insulation prices at every store

  • Home DepotNew

    In stock

    $33.35Observed at 3:10 PM
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Owens Corning FOAMULAR NGX F150 1 in. x 48 in. x 8 ft. R-5 XPS Rigid Foam Board Insulation price history

Lowest price we've seen: $33.35 on Nov 4 at Home Depot. Tracked across 1 store since Nov 4.

What reviewers say

XPS board like this is bought for its moisture resistance and easy cutting more than for high R-value. Owners of FOAMULAR boards generally report clean cuts and firm panels, but note that 1 in. board gives limited insulation and that seams need sealing.

Pros
  • Cuts cleanly with a utility knife
  • Holds up in damp basements
  • Stiff panels that stay flat
Cons
  • Low R-value for the money
  • Edges can crumble if handled roughly
  • Needs taping or sealing at seams

Specifications

Form
Boards
Product Type
Rigid Foam Board
Insulation Type
Thermal
Insulated Plasterboard
No
R-Value
R-5
Sound Transmission Class
Not rated for STC, Not an effective sound blocker
Coverage Area
32 sq ft
R-Value Per Inch
R-5 per inch
Thickness
3 in.
Board Size
1 in. x 4 ft. x 8 ft.
Length
8 ft
Width
4 ft.
Material Type
Polystyrene
Facing
Unfaced
Material Composition
Formaldehyde Free
Vapor Retarder
No
Application
Energy savings, Thermal insulation
Recommended Usage
Both (interior/exterior)
Suitable Surfaces
Wood, Plywood
Installation Method
Board Installation
Moisture Resistance
Water Resistant
Mold Resistance
Mildew resistant, Mold Resistant
Pest Resistance
Resists corrosion and rot
Flexibility
Rigid

Questions and answers

Is 1 in. FOAMULAR enough insulation for a basement wall?
R-5 alone rarely meets code for a finished basement wall. It is usually combined with framed cavity insulation, and many codes require a thermal barrier over foam indoors.
How much area does one board cover?
Each 1 in. x 4 ft. x 8 ft. board covers 32 sq ft. Divide your wall area by 32 to get the board count, then add about 10 percent for cuts.
Can I use it outside as sheathing?
Yes, it is rated for exterior use over wood and plywood. It is unfaced, so it is not a vapor retarder, and joints should be taped.
Is it a soundproofing product?
No. It is not rated for STC and is not an effective sound blocker. Use dedicated acoustic products if noise is the goal.
Is $33.35 a good price?
At $33.35 for 32 sq ft, that is about $1.04 per sq ft at Home Depot as of November 4, 2026. With only one store listing it, compare against 2 in. board, which often costs less per R-value.
Does it come with a vapor barrier?
No. The board is unfaced and has no vapor retarder, so plan a separate vapor control layer where your assembly needs one.
Where is the Owens Corning FOAMULAR NGX F150 1 in. x 48 in. x 8 ft. R-5 XPS Rigid Foam Board Insulation cheapest?
At Home Depot, for $33.35, as of our latest check.

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