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FOAMULAR 250 2 in. x 2 ft. x 8 ft. R-10 Tongue and Groove Rigid Foam Board Insulation Sheathing

  • Saves energy and resists moisture with limited lifetime warranty
  • Tongue and groove board edge to reduce gaps and eliminate drafts
  • Strong, lightweight pink foam panels don't require special tools
  • See More Details

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 & 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 percent recycled content.
  • Dimensions: 2 in. x 2 ft. x 8 ft.
  • Application: Exterior Foundation Walls, Underslab, 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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Specifications

Dimensions

Coverage Area (sq. ft.)
16
Product Depth (in.)
0
Product Height (in.)
0
Product Length (ft.)
8 ft
Product Thickness (in.)
2 in
Product Width (in.)
24 in

Details

Compatible Install Surface
Plywood,Wood
Faced or Unfaced
Unfaced
Insulation Features
Formaldehyde Free,Vapor Retardant
Insulation Location
Crawlspace,Exterior Wall,Exterior Wall Foundation,Under Slab
Insulation R-Value
R10
Insulation Type
Foam Board Insulation
Interior/Exterior
Exterior
Number of Pieces
12
Pack Size
1
Product Weight (lb.)
4.4 lb
Sheathing Size
8 ft. x 2 in. x 24 in.
Sheathing Type
XPS

Warranty / Certifications

Warranty Information
Lifetime Limited

Questions & Answers

309Questions28Answers

I would like to insulate the ceiling of my shipping containers from summer heat. Fasteners will c...

Asked by Chris June 16, 2021
0
Answers

Can I coat this with a Fireproofing Flame Retardant Paint and leave it exposed on the interior wa...

Asked by Emzet April 29, 2021
2
Answers

Hello Emzet, Owens Corning cannot make any recommendation on intumescent paint to try and make Foamular fire rated. Thank you for your inquiry!

I want to put about three sheets in the attic on top of ceiling joists to provide access to HVAC....

Asked by JoeD April 29, 2021
4
Answers

Hello JoeD, Foamular is not intended for an application over joists. Point loads from walking on the plywood could cause compression concerns to the Foamular. Thank you for your inquiry!

CAN THIS PRODUCT BE USED ON HOUSE WINDOW TO BLOCK SOUND?

Asked by JIMMY April 11, 2021
5
Answers

I use two layers and have great sound reduction

How much cost per sheet ?

Asked by Bill April 7, 2021
2
Answers

Hello Bill, please contact your local Home Depot for pricing and availability. Thank you for your inquiry!

Can this be used as sauna insulation in the steam room. Will it off gas and cause smell or issues?

Asked by Jdog March 16, 2021
2
Answers

Dear JDog: Foamular XPS foam board is ideal for sauna insulation because it does not absorb moisture. Polyiso foam board does. One key caveat: Foam board is flammable and must be covered by an approved thermal barrier, e.g. 3/4" plywood. Use marine / exterior grade, then apply cedar shiplap on top. Never install foam board near a source of heat, e.g. the 'rock box' or heater for your sauna. Use rock wool near sources of heat; it is flame resistant and provides R-4.1 per inch of thickness. This must be covered as well, because rock wool fibers are irritating like fiberglass. Again, you could cover it with cedar shiplap. If you don't want to use foam board due to the flammability issues, Rock Wool makes a version called RockBoard that you can order from your Home Depot's Customer Service or Pro desk. This produce is 1 1/2" thick and provides R-6. You can install it like foam board, and it does not absorb water, and resists fire. Home Depot sells many products like this that are not on retail store shelves; they will deliver quickly to your store for no charge, or to your home or jobsite for a small fee. Ask for "RockBoard 60" with poly facing. I hope this is helpful. My family is from Finland so we know from saunas. Mark

for tortoise cage (currently only has frame so no walls yet),after I install the walls, can I put...

Asked by jimmo March 12, 2021
2
Answers

Hello jimmo, Owens Corning Foamular products should not be used in exposed applications. The Foamular is a combustible product and needs to be covered by a 15-minute thermal barrier such as 1/2" drywall. Thank you for your inquiry!

Would this work in basement, attached to the back side of 2x4 framed walls, but set off concrete block walls by a few inches?

Asked by Bk717 March 9, 2021
4
Answers

There are many ways to do this. The most popular method is to attach the foam panels to the block wall, then build the 2x4 wall... some people butt the wall up against the foam panels, and some leave an "air gap" which supposedly helps air out any moisture that gets between the 2 walls. Whatever you decide upon, you should probably treat the block wall with a product like Dryloc to seal the pores from moisture/humidity, and use a vapor barrier/plastic sheeting to protect both sides of the unfaced batt insulation wall from moisture and humidity, and attach your drywall over that.

Can I use this to block my fireplace when not using it to stop the draft???

Asked by MJ February 19, 2021
5
Answers

Hello MJ, Owens Corning does not recommend using Foamular in this type of application. Foamular is a combustible product and needs to be covered by a 15 minute thermal barrier such as 1/2" drywall. Thank you for your inquiry!

Can I insulate a window with this??

Asked by Nik February 17, 2021
2
Answers

Dear Nik: If you mean, "Cut a piece that fits inside a window frame", this will not be very effective unless you have a tight air seal around the perimeter -- e.g. with a carefully cut-to-fit piece of foam board. Also be aware that foam board is flammable and emits toxic gas when it burns. It sounds like you need new windows. I hope this is helpful, Mark

FOAMULAR 250 2 in. x 2 ft. x 8 ft. R-10 Tongue and Groove Rigid Foam Board Insulation Sheathing - page 2

Customer Reviews

  • 4.8
    out of 430 reviews
  • 98% recommend this product
Filter by:
Showing 1-10 of 430 reviews
Works as designed. Used for a basement
Works as designed. Used for a basement
by DIYer
Three 2" staggered layers below a -20 freezer,
Three 2" staggered layers below a -20 freezer,
by REFRIG
1 person found this helpful
Affordable and easy to install!
Affordable and easy to install!
by RandGFarms
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
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
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
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
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
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
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
17 people found this helpful
Showing 1-10 of 430 reviews