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FOAMULAR 150 1-1/2 in. x 4 ft. x 8 ft. R-7.5 Scored Squared Edge Rigid Foam Board 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.

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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: 1-1/2 in. x 4 ft. x 8 ft.
  • Application: exterior sheathing and interior basement walls
  • 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
  • Click here to shop Loctite foamboard adhesive
  • 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

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

Details

Compatible Install Surface
Concrete,Wood
Faced or Unfaced
Unfaced
Insulation Features
Formaldehyde Free
Insulation Location
Exterior Wall Foundation
Insulation R-Value
R7.5
Insulation Type
Foam Board Insulation
Interior/Exterior
Exterior
Number of Pieces
1
Pack Size
4
Product Weight (lb.)
5.9 lb
Sheathing Size
8 ft. x 1.5 in. x 48 in.
Sheathing Type
XPS

Warranty / Certifications

Warranty Information
Limited Lifetime

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.8
    out of 264 reviews
  • 99% recommend this product
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Showing 1-10 of 264 reviews
Great product, fills my needs. I do recommend to use a fine tooth circular saw to cut the 1 1/2" ...
Great product, fills my needs. I do recommend to use a fine tooth circular saw to cut the 1 1/2" boards, makes a smooth quick cut.
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  • Verified Purchase
  • Recommended
3 people found this helpful
I love this stuff, can't get enough of it.
I love this stuff, can't get enough of it.
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  • Verified Purchase
  • Recommended
2 people found this helpful
I used this to insulate my van as I convert it to a camper van. Easy to work with and seems to ...
I used this to insulate my van as I convert it to a camper van. Easy to work with and seems to provide good insulation properties.
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  • Verified Purchase
  • Recommended
Insulated my 30x40 pole barn garage with this. None of the snap off sizes fit what I needed but i...
Insulated my 30x40 pole barn garage with this. None of the snap off sizes fit what I needed but it was easy to cut. I can tell a big difference in the temperature inside.
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  • Recommended
2 people found this helpful
I used this to line my basement concrete walls before framing and finishing. I used this type bec...
I used this to line my basement concrete walls before framing and finishing. I used this type because of its moisture barrier properties. I haven't finished the framing yet or tried a temperature comparison or anything like that, but I would recommend this for general insulation. It cuts and shapes easily and seems to create a good solid barrier. I used foil tape to block the seams which also helps seal it as a barrier. I have used it around a few windows that seemed to be leaking air and this insulation seems to have helped quite a bit. For general insulation, especially where a full barrier is needed and makes sense for your application, I would definitely recommend. I used some tables to hold the insulation tight against the wall while the liquid nails behind it dried.
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3 people found this helpful
foam board was easy to handle, covered a large area quickly and easy to trim to fit or trim aroun...
foam board was easy to handle, covered a large area quickly and easy to trim to fit or trim around obstacles
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  • Recommended
Used this product to build scenic theater components (4-piece Christmas tree and 5-piece mountain...
Used this product to build scenic theater components (4-piece Christmas tree and 5-piece mountain). Paints easily with a primer/paint combination. Tree was detailed with 3D paper lanterns as ornaments.
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  • Recommended
15 people found this helpful
We line custom made ice sinks with this foam; it cuts smoothly and keeps the ice frozen all day.
We line custom made ice sinks with this foam; it cuts smoothly and keeps the ice frozen all day.
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  • Recommended
3 people found this helpful
insulated hatch way.
Easy to cut and insulated the hatch way door very easily.
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    Showing 1-10 of 264 reviews