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FOAMULAR 250 2 in. x 48 in. x 8 ft. R-10 Scored Squared Edge Insulation Sheathing

  • Saves energy and resists moisture with limited lifetime warranty
  • Scored edge easily snaps into smaller boards for best fit
  • Strong, lightweight pink foam panels don't require special tools
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Product Overview

Home with pink outline and Owens Corning logo

A Home is a Fortress

It keeps comfort and safety in - and the other stuff out. Help create the year-round protection every home deserves with proven solutions that work where and when you need them most.

close up of Owens Corning Foamular with water beads

Owens Corning FOAMULAR XPS

FOAMULAR is a rigid insulation board made of extruded polystyrene. XPS for short. Compared to EPS products, FOAMULAR XPS has 25% more insulating power and is 10 times more water resistant.

Cutaway image of a house with Foamular installed in different locations

Choose Above- and Below-Grade Protection

FOAMULAR provides continuous insulating power around the entire home from the foundation to the roofline and all kinds of spaces in between.

man installing fiberglas insulation  over Foamular

Insulating Basement Walls

FOAMULAR is the easy-to-install insulating solution for basement walls. Get added comfort with PINK Fiberglas insulation and finish with drywall board.

man installing Foamular in exterior foundation application

Insulating Foundation Walls

FOAMULAR is ideal for insulating exterior foundation walls. Extremely durable, it can withstand up to 15-25 psi and resists common acid soils and decay.

man installing siding over Foamular

Insulating Under Exterior Siding

FOAMULAR provides a higher R-value per inch than other materials commonly used for exterior wall sheathing.

man installing Foamular fanfold insulation

Also Available in Fanfold

FOAMULAR Fanfold is generally intended for use as a backer board for residing applications and comes in 50-foot sections for a faster install.

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Superior Moisture Resistance

Virtually impervious to moisture. FOAMULAR has up to 10X more resistance to water than EPS insulation.

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Durable, Yet Flexible

A wide range of compressive strengths –up to 100 psi – to handle heavy loads.

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Easy to Cut, Form and Fit

Easy to handle, score, cut and install; no special tools needed.

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Outstanding Insulating Properties

High, stable R-value (5 per inch of product thickness) - more than wood fiber, plywood or 1/2” gypsum board.

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Sustainable

Foamular is certified to meet indoor air quality standards under the stringent GREENGUARD Gold Certification Program.

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Lifetime Guarantee

The only XPS with a limited lifetime warranty that guarantees a minimum 90% of R-value for the life of the product.

FOAMULAR Extruded Polystyrene (XPS) Rigid Foam Insulation offers a comprehensive line of products in a wide choice of sizes, thicknesses and edges with a Lifetime Limited Warranty for the life of the home or building. The products are easy to handle, score, cut and install and no special tools are needed. Products can be used on wood, steel framing or concrete walls. FOAMULAR XPS resists moisture and retains R-value even after exposure to standing water and wet soil. Only XPS foam to be GREENGUARD Gold Certified and the first XPS foam certified by Scientific Certification Systems (SCS) to contain a minimum of 20% recycled content.
  • Dimensions: 2 in. x 48 in. x 8 ft.
  • Application: exterior foundation walls, under slab, foundations and crawlspaces
  • Designed to resist moisture and helps to block mildew
  • Has a higher R-value than wood fiber, plywood or 1/2 in. gypsum board products
  • FOAMULAR has superior moisture resistance compared to EPS and Polyiso foam boards
  • FOAMULAR 150 and 250 are available in various thicknesses and R-values, the difference is the compressive strength. FOAMULAR 150 has a compressive strength of 15 psi and FOAMULAR 250 is 25 psi
  • FOAMULAR is not rated for STC (sound transmission) and does not have any soundproofing properties. Owens Corning fiberglass batts and rolls are great options for acoustic applications.
  • When using FOAMULAR or any low perm insulation, always verify the moisture vapor flow and dew point characteristics of the wall system.  Please check your local building codes for vapor retarder/barrier information.
  • If being used in an interior construction application, painting the FOAMULAR is not recommended as FOAMULAR cannot be left exposed and will need to be covered by a 15 minute thermal barrier such as drywall.
  • If being used for crafts, acrylic or latex based paints can be used with FOAMULAR products.
  • If you're looking to insulate your garage door, Owens Corning Garage Door Insulation Kit is an easy, fast and affordable way to keep your garage warm in winter and cool in the summer.
  • If you’re looking to ventilate your attic rafters, Owens Corning Raft-R-Mate is a XPS foam vent designed to assure unrestricted airflow from the soffit to the ridge vent.
  • FOAMULAR is available in two edge configurations:
  • Square Edge - designed to fit flush next to adjoining boards
  • Scored Square Edge - comes with 3 factory scores, so that you can take a 4' sheet, break it in two and have two, 2' wide sheets (middle score), or you can break it into three 16" wide pieces by snapping at the left and right score.
  • Click here to shop Loctite foamboard adhesive
  • Click here to learn more about Eco Options and Energy Efficiency

Info & Guides

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FOAMULAR 250 2 in. x 48 in. x 8 ft. R-10 Scored Squared Edge Insulation Sheathing

Compare Similar Foam Board Insulation

FP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel0.625 in. x 48 in. x 24 in. 72 sq. ft. R-3 Graphite Radiant Barrier Wall Insulation Kit (9-Sheets/Kit)
current product
FOAMULAR 250 2 in. x 48 in. x 8 ft. R-10 Scored Squared Edge Insulation Sheathing
BrandSTYRO IndustriesSilveRboardOwens Corning
NameFP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel0.625 in. x 48 in. x 24 in. 72 sq. ft. R-3 Graphite Radiant Barrier Wall Insulation Kit (9-Sheets/Kit)FOAMULAR 250 2 in. x 48 in. x 8 ft. R-10 Scored Squared Edge Insulation Sheathing
Price
$2928
$5457
Ratings
(8)
(14)
(437)
Product Thickness (in.)2 in0.63 in2 in
Insulation LocationExterior Wall Foundation2x4 Wall,2x6 Wall,2x8 Wall,Attic,Basement,Ceiling Insulation,Crawlspace,Exterior Sheathing,Garage,Metal Building,Re-SidingExterior Sheathing,Exterior Wall Foundation,Under Slab
Insulation R-ValueR10R3.0R10
Insulation FeaturesMold Resistant,Paintable,Water ResistantFormaldehyde Free,Moisture Retardant,Mold Resistant,Soundproofing Insulation,Vapor RetardantFormaldehyde Free,Vapor Retardant
Sheathing TypeXPSEPSXPS
Compatible Install SurfaceCement,Concrete,Existing InsulationCement,Concrete,Existing Drywall,Existing Insulation,PlywoodPlywood
Faced or UnfacedFacedFacedUnfaced
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Specifications

Dimensions

Cover Area Per Bag (sq. ft.)
192 ft²
Coverage Area (sq. ft.)
32 ft²
Product Length (ft.)
8 ft
Product Thickness (in.)
2 in
Product Width (in.)
48 in

Details

Compatible Install Surface
Plywood
Faced or Unfaced
Unfaced
Insulation Features
Formaldehyde Free,Vapor Retardant
Insulation Location
Exterior Sheathing,Exterior Wall Foundation,Under Slab
Insulation R-Value
R10
Insulation Type
Foam Board Insulation
Interior/Exterior
Exterior
Number of Pieces
1
Pack Size
4
Product Weight (lb.)
7.5 lb
Sheathing Size
8 ft. x 2 in. x 48 in.
Sheathing Type
XPS

Warranty / Certifications

Warranty Information
Lifetime Limited

Questions & Answers

Typical questions asked about products:

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Customer Reviews

  • 4.8
    out of 439 reviews
  • 98% recommend this product
Filter by:
Showing 1-10 of 439 reviews
Works as designed. Used for a basement
Works as designed. Used for a basement
by DIYer
  • Verified Purchase
  • Recommended Product
Three 2" staggered layers below a -20 freezer,
Three 2" staggered layers below a -20 freezer,
by REFRIG
  • Verified Purchase
  • Recommended Product
1 person found this helpful
Affordable and easy to install!
Affordable and easy to install!
by RandGFarms
  • Verified Purchase
  • Recommended Product
2 people found this helpful
Cut scuttle hole into attic. Cut 3 pcs to opening size. Used latex caulk to bond 3 pieces togethe...
Cut scuttle hole into attic. Cut 3 pcs to opening size. Used latex caulk to bond 3 pieces together. Wanted the same R30 insulation value in the opening after cutting with future access to the area. This worked Great! ( yes I'm adding a cover and trim to the opening ) I have 3 other access areas to the attic and this cover and trim will just be installed with screws and painted.
by bristu57
  • Pro
  • Verified Purchase
  • Recommended Product
3 people found this helpful
Easy to work with and keeps cold out and heat in the winter.
Easy to work with and keeps cold out and heat in the winter.
by Marty
  • Verified Purchase
  • Recommended Product
3 people found this helpful
Home Depot had the best pricing the description of the product was as listed.
Home Depot had the best pricing the description of the product was as listed.
by Charltondad
  • Verified Purchase
  • Recommended Product
1 person found this helpful
We live in a flood zone and this is the best option for insulation after our hurricane flooding. ...
We live in a flood zone and this is the best option for insulation after our hurricane flooding. I know one day it's going to flood again. This option will help speed up the cleaning process. Easy to cut and install.
by Duncan
  • Verified Purchase
  • Recommended Product
3 people found this helpful
I have used this product for many years as a table base for model railroad work. It is easy to c...
I have used this product for many years as a table base for model railroad work. It is easy to cut with a hot wire knife or long thin blade knife. I mount the Foamular to a 1x3 wood frames with foam safe glue. Great for a light weight and portable model railroad layout.
by JD
  • Verified Purchase
  • Recommended Product
7 people found this helpful
This insulation was easy to install on my basement walls...
This insulation was easy to install on my basement walls for insulating my basement so I can finish it! Great product!
by Ray
  • Verified Purchase
2 people found this helpful
I don't like that it's scored
I used this previously to build an insulation box for our whole house fan. I came back a couple of years later to get more to build a box to put over our attic door. Unfortunately, it is now scored every 8 inches to a thickness of about 1" so that it is easy to cut to put between studs. However, the scoring reduces the R value and makes it less useful for my purposes
by Leo9
    • Recommended Product
    18 people found this helpful
    Showing 1-10 of 439 reviews