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FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 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 Details

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 product line of insulation boards - choose the strength you need, from 15 to 60 PSI and exceptional moisture resistance. Products provide superior insulating properties; R-value (5- in. of product thickness). Foam insulation boards are easy to handle, score, cut and install & no special tools are needed. Rigid foam insulation products can be used on wood, steel framing or concrete walls.Owens Corning provides home builders and home buyers with a number of insulation solutions to meet their needs.
  • Dimensions: 2 in. x 4 ft. x 8 ft.
  • Insulation Application: exterior sheathing and interior basement walls
  • Insulation foam boards are highly moisture-resistant and helps to block mildew
  • Rigid foam insulation 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
  • Being used in an interior construction application, painting the fo is not recommended as foamular cannot be left exposed and will need to be covered by a 15 minute thermal barrier such as drywall
  • Being used for crafts, acrylic or latex based paints can be used with foamular products
  • 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 2 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 ft. sheet, break it in 2 and have two, 2 ft.wide sheets (middle score) or you can break it into three 16 in. wide pieces by snapping at the left and right score
  • Click here to shop Owens Corning Foam Board Insulation styles
  • Click here to learn more about Eco Options and Energy Efficiency
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Additional Resources

From the Manufacturer

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Specifications

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Questions & Answers

242Questions
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Q:Can I put a resin over this
by|Feb 4, 2023
0 Answer
Answer This Question
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Q:Can you install this insulation in a basement that has a french drain around the interior perimeter?
by|Jan 27, 2023
1 Answer
Answer This Question

A:  Hello Matt, As long as the wall is sound and not leaking Foamular can be used in this application. You will want to leave a 1 to 2" gap from the insulation to the top of the floor. Thank you for your inquiry!

by|Jan 30, 2023
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    Q:Can this insulation be used on the underbelly of a mobile home?
    by|Jan 20, 2023
    3 Answers
    Answer This Question

    A:  Yes.But it is very flammable. Very easy to cut and install

    by|Jan 23, 2023

      A:  Hello Wilma, We are not able to provide information or recommendations for the use of Foamular below a mobile home. We suggest discussing options with the mobile home manufacturer. Thank you for your inquiry!

      by|Jan 24, 2023
        1 found this answer helpful

        A:  I would say yes. Either with a structure built to hold it, or adhesive to lower surface.

        by|Jan 23, 2023
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          Q:Can this product be used on a metal building to be used the 1/2" sheetrock
          by|Jan 5, 2023
          1 Answer
          Answer This Question

          A:  Hello Mary, Owens Corning Foamular has successfully been used in metal building applications. Foamular is a combustible product and cannot be left exposed. It needs to be covered by a 15 minute thermal barrier. Thank you for your inquiry!

          by|Jan 5, 2023
            Showing 1-4 of 242
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            Customer Reviews

            4.8 out of 5
            (218)
            • 4.8
              out of 218 reviews
            • 100%recommend this product
            Filter by:
            Showing 1-10 of 218 reviews
            Insulation
            This is the only insulation I will buy. My whole house has it
            by
            • Verified Purchase
            I have used this insulation on several projects
            This 2 inch foam insulation has been used on several projects in the last 10 years. Last year I built a 6 ft by 9 ft temporary RV to use on a job, now I use it as a storage shed. This year I am building a 5 ft by 12 ft trailer and I'm using it again because it worded so well. Sadly the price has increased by about 33% from $32 to around $39 but still worth it to me.
            by
              • Recommended
              2 found this review helpful
              I've used this product for several applications. In this case I have a room under our front porc...
              I've used this product for several applications. In this case I have a room under our front porch, which is mostly underground; I want to turn it into a wine cellar. Doing this will help control the temperature enough to store wire, I hope. It won't be anything fancy, but I figured using this rigid insulation will not take up as much space & I don't need to build any kind of stud wall to install it. I am gluing it to the walls with a construction adhesive specifically for foam insulation. It does need to be clamped in place in order to the glue to hold the foam as I intended. To cut the product I simply score it with a utility knife on both sides & snap it like dry wall. I routed out a channel for wiring, which worked well.
              by
              • DIY
              • Verified Purchase
              • Recommended
              1 found this review helpful
              Very easy to install ... durable (walked on it after and my 270 husband did not dent it).
              Very easy to install ... durable (walked on it after and my 270 husband did not dent it).
              by
              • Verified Purchase
              • Recommended
              2 found this review helpful
              Nice to work with. Seems to cut cleaner with a utility knife than the Dow Styrofoam. It also seem...
              Nice to work with. Seems to cut cleaner with a utility knife than the Dow Styrofoam. It also seems to a little denser and less prone to damage.
              by
              • Verified Purchase
              • Recommended
              1 found this review helpful
              Excellent product that's easy to work with.
              Excellent product that's easy to work with.
              by
              • Pro
              • Verified Purchase
              • Recommended
              1 found this review helpful
              We installed Foamular 150 2 inches 4x8 ft into our house's attic. It seems that the space covered...
              We installed Foamular 150 2 inches 4x8 ft into our house's attic. It seems that the space covered be immediately warmer and look better. Attached is the photo of our action using the product. ZH13
              by
              • Verified Purchase
              • Recommended
              After researching the net for insulation not only for a crawl space and a basement I felt this wo...
              After researching the net for insulation not only for a crawl space and a basement I felt this would be the best product for the application. This was easy cutting this Formular 150 R-10 2" insulation in any dimension via a Olfa knife, circular saw and or a table saw. I completed most of my cuts prior to installation and installation was much easier and time efficient. I have already completed the installation 11/23/18 on the crawl space (encapsulated the crawl) and have already observed a savings in heating costs by 18% and the floors are much warmer by 8 degrees. I no longer smell the dank crawl space and the interior environment of the house has improved 100%. I am not encapsulating the basement; however, I will use this on all of the walls and fascia boards to effectively do the same as the crawl. I have calculated the return on investment at approximately 18 to 24 months. I would highly recommend this product and it definitely met my expectations.
              by
              • Verified Purchase
              • Recommended
              3 found this review helpful
              Easy to work with.
              Easy to work with.
              by
              • Verified Purchase
              • Recommended
              I am re-insulating my attic by adding R-30 un-faced rolls perpendicular to the ceiling joists. I ...
              I am re-insulating my attic by adding R-30 un-faced rolls perpendicular to the ceiling joists. I used the 2" foam to build an attic stairway insulated cover. I built a frame with hinges to attach it too - if I ever build another one, I may just glue the foam together w/o the frame to see if it will work by itself.
              by
              • Verified Purchase
              • Recommended
              3 found this review helpful
              Showing 1-10 of 218 reviews

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              Ratings
              (26)
              (56)
              (218)
              (14)
              Product Thickness (in.)2 in2 in2 in2 in
              Insulation R-ValueR10R10R10R10
              Insulation LocationExterior Wall FoundationExterior Wall FoundationExterior SheathingBasement
              Insulation FeaturesMold Resistant,Paintable,Water ResistantMold Resistant,Paintable,Water ResistantFormaldehyde FreeFormaldehyde Free
              Faced or UnfacedFacedFacedUnfacedUnfaced
              Sheathing TypeXPSXPSXPSXPS
              Pack Size1184
              THD SO SKU 1000203202
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