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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
  • 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.

icon for moisture resistance

Superior Moisture Resistance

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

icon for compressive strength

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.

icon for insulation performance

Outstanding Insulating Properties

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

icon for sustainability

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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Compare Similar Foam Board Insulation

FP Ultra Lite 1.5 in. x 2 ft. x 4 ft. Earthtone Brown Foundation PanelFP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel9-1/2 in. x 150 ft. Sticky Mesh Heavy Duty
current product
FOAMULAR 150 1-1/2 in. x 4 ft. x 8 ft. R-7.5 Scored Squared Edge Rigid Foam Board Insulation Sheathing
BrandSTYRO IndustriesSTYRO IndustriesSTYRO IndustriesOwens Corning
NameFP Ultra Lite 1.5 in. x 2 ft. x 4 ft. Earthtone Brown Foundation PanelFP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel9-1/2 in. x 150 ft. Sticky Mesh Heavy DutyFOAMULAR 150 1-1/2 in. x 4 ft. x 8 ft. R-7.5 Scored Squared Edge Rigid Foam Board Insulation Sheathing
Price
Ratings
(24)
(7)
(52)
(252)
Product Thickness (in.)1.520.0751.5 in
Insulation LocationExterior Wall FoundationExterior Wall FoundationBasement,Ceiling Insulation,Exterior Sheathing,Exterior Wall,Exterior Wall Foundation,Interior Ceiling,Interior Wall,Wood SidingExterior Wall Foundation
Insulation R-ValueR7.5R10 R7.5
Sheathing TypeXPSXPSEPSXPS
Insulation FeaturesMold Resistant,Paintable,Water ResistantMold Resistant,Paintable,Water ResistantMold ResistantFormaldehyde Free
Product Length (ft.)221508 ft
Compatible Install SurfaceCement,Concrete,Existing InsulationCement,Concrete,Existing InsulationCement,Concrete,Existing Drywall,Existing Insulation,Fiberglass,Plywood,WoodConcrete,Wood
Coverage Area (sq. ft.)8811932
Faced or UnfacedFacedFacedUnfacedUnfaced
Interior/ExteriorExteriorExteriorInterior/ExteriorExterior
View ProductView ProductView ProductView Product

Specifications

Dimensions

Coverage Area (sq. ft.)
32
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
1
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

82Questions26Answers

Can these be used for sound dampening panels?

Asked by Cody March 9, 2021
2
Answers

Hello Cody, Foamular Extruded Polystyrene Foam is a thermal not an acoustical insulation. It is neither an effective sound absorber nor a sound blocker. Foamular Insulation may be perceived as a soft, porous material which, if installed on the interior surfaces of a room, may absorb some sound energy, thereby reducing reflective sound and shortening reverberation time. However, Foamular Insulation is not recommended for exposed use in interior spaces; once covered with a thermal barrier such as ½” gypsum board, the sound absorption properties of Foamular Insulation become irrelevant. Thank you for your inquiry!

NEVER SEE THIS IN STOCK? Online been needing 4 sheets but its never available here on the websit...

Asked by Al March 1, 2021
3
Answers

Hello Al, please check with your local Home Depot for product availability. Thank you for your inquiry!

When will this be back in stock? If not, how can I order it?

Asked by Hal February 23, 2021
1
Answer

Hello Hal, For product availability please check with your local Home Depot Store. Thank you for your inquiry!

Hi. I have a basement and some minor seepage/dampness through the concrete walls (no pooling on t...

Asked by George February 18, 2021
4
Answers

Dear Sean: Thanks for the details about your basement. Here are some recommendations: (1) First make sure there are no cracks and leaks in the walls. Fill and seal cracks with Sikaflex Model # 7116110, Home Depot Internet #300934565 Store SKU #652010 If moisture is coming through the wall, apply damp-proofing to the surface. Products like Drylok can provide an important layer of moisture protection. See: Drylok Model # 28615, Home Depot Internet #202610896 Store SKU #1000531519. This product will minimize diffusion from the soil through the foundation. (2) Use 2" thick Foamular XPS foam board on the concrete walls. XPS does not absorb moisture; a 2" thick layer will provide R-10 insulation plus a strong vapor retarder. (3) Using foam board compatible glue, fasten sheets of foam board to your concrete walls. Apply a thick bead around the perimeter of each sheet, to create an air seal when it is pressed against the concrete wall. See: Loctite PL300 Model # 1421941, Home Depot Internet #202020476 Store SKU #780400. You can lean a 2x4 against each sheet to hold it in place while the glue sets, or pin them in place with a RamSet. After all of the sheets of foam board are installed, seal all of the joints and edges to block air leaks. DAP 230 works well for joints and small gaps; the 'Window and Door' version of Great Stuff foam is good for larger gaps. (4) Build your new 2x interior wall in front of the foam board. Use pressure treated (PT) lumber for the sole plate. If water leaks could occur and the floor may be damp, install a piece of Veranda cellular PVC trim on the floor first, to lift the sole plate off the concrete and keep if from rotting; leave small gaps every few feet for water to trickle through under the DriCore panels noted below. Use a RamSet to drive nails into the concrete, or drill holes for expansion bolts. We use bolts in areas with high stress, e.g. near doorways, stair landings and the ends of pony walls. See: RamSet Model # 00022, Home Depot Internet #100091715 Store SKU #107708. Be sure to wear ear and eye protection when you use a RamSet. (5) Insulate and seal the rim joist pockets: Pack the end of each bay with rock wool ~6" deep. (6) Run your electric lines to receptacles and lights. Fire block (seal) the holes in the studs with 3M Fire Block sealant. See: 3M Model # FB 136, Home Depot Internet #100390499 Store SKU #191728 DO NOT use any type of spray foam, even if it says "Fire Block" on the label, e.g. Great Stuff. These spray foam are actually very flammable. Informed building inspectors can fail an inspection if they find spray foam used for fire blocking. (7) Fill the stud bays with rock wool - the most cost effective solution. See: Owens Corning Model # UB-40-P3D-15--47--121, Home Depot Internet #304633821 Store SKU #1003061505. (8) If there is any possibility of a water leak into your basement, install DriCore panels on the floor first. They have a rubber surface on the bottom with channels that water can trickle through. Make sure, of course, that you have a drain with a dry well or sump pump for the water to escape to. Carefully seal all of the joints and edges of the DriCore panels to block air / moisture leaks. Then install 1" of Foamular on top of the DriCore, and seal the joints and edges. Cover the Foamular with 3/4" plywood as the subfloor / nailbase for your new flooring. Run the plywood 90 degrees from the direction of the foam board, with a 1/2" gap around the edge for expansion. Again, seal all of the joints and edges. See: DriCore Model # CDGNUS750024024, Home Depot Internet #202268752 Store SKU #361018. We installed DriCore at a recent project as a fail-safe, even though the basement was dry. Water leaked in unexpectedly through a window during a downpour, and DriCore saved the new floor. If you are certain that there is no possibility of a water leak into your basement, install 1" thick Foamular on the concrete floor -- and seal the joints and edges. Cover this with 3/4" plywood, running 90 degrees to the foam board panels. Leave a 1/2" gap around the edge to allow for expansion. Again, seal all of the joints and edges. (9) Also read up on fire blocking, which many people overlook. This is required at the top of basement walls, along the walls, at the top of stairs, etc. Do a Google search for "Fire Blocking Basics" from JLCOnline. Roxul rock wool is a good solution. You can stuff it into the gap at the top of the wall and into the end of floor joist bays. To seal holes created for pipes and wiring, use fire resistant caulk, e.g. 3M Model # CP-25WB+, Home Depot Internet #100166701 Store SKU #163096.. DO NOT use the "Fireblock" version of Great Stuff foam; as noted above. I hope this is helpful. Mark

I am working on a rustic building where fiberglass insulation was removed due to rodents. Thinkin...

Asked by Nick January 9, 2021
3
Answers

Hello Nick, Reflective insulation requires a sealed air space to provide R-value. Both the Reflectix and Foamular are not attractants for rodents, but neither will repel rodents, and both can easily be damaged by rodents. First step to any insulation options will be to remove potential for rodents to get into that space. Thank you for your inquiry!

What is your best foam for insulation of an existing concrete slab on grade?

Asked by Elgin December 29, 2020
3
Answers

Hello Elgin, Foamular is XPS foam. Depending on your situation, it may or may not be the best choice. In some cases, EPS foam might be better (also sold at HD). Let's look at the differences: EPS (expanded polystyrene) and XPS, (extruded polystyrene) are both made of polystyrene resin, they both use trapped air as their insulating medium, both have a closed-cell structure, and both fall under the same manufacturing standard. EPS uses steam and a blowing agent to produce cellular structures via a foaming process to expand resin beads and then remold them into blocks. While XPS involves melting the resin through with an extruder and then expanding it. But what does all that mean? Moisture: If you are placing this on a slab say in a basement or place where moisture comes through the pad, EPS is much more moisture resistant than XPS. EPS has been shown to retain less moisture than XPS rigid-foam insulation. EPS insulation was found to have a 4.8% moisture content by volume compared to 18.9% found in the XPS. Drying was equally different. Measured after 30 days, it was found that EPS had only 0.7% remaining while the XPS had 15.7% remaining! However, if your slab situation is dry or if you experienced some moisture, you can always opt for a moisture barrier like 6mm plastic barrier. Next is compressive strength. The compressive strength of insulation is the measure of how well it stands up to pressure before it begins to break. Both EPS and XPS come in compressive strength levels ranging between 10 and 60 psi. XPS also comes in 100 psi options. Residential floors are usually required to withstand 30 to 40 psi. Check each model or their website as it will give the PSI rating. If you are using in a place that has heavy equipment or say huge fish tanks, you would have to use the XPS with the 100 psi rating. The assembly. Putting a finished floor over a sub floor is nicer on your feet - not just the temp, but the give rather than standing on concrete. Depending on the climatic zone you live in, a 1/2", 1", 1-1/2" or 2" layer of foam may be appropriate. Next, you would want to add tongue and groove good quality ~1/2" plywood offset from seams of the foam below. On top of that you would want to do a second layer of the same plywood perpendicular to the first (again ensuring no seams align). You would want to screw the top layer of plywood into the layer below. The finished floor would go on top of that and install as normal. This is a floating floor and you would not have to attach into the slab. Issues: Depending on the thickness of foam, you could lose 3" of head height. In a finished house, there will be issues with doorways. You would literally have to pull the door jambs out, raise the rough openings and put the door jambs back. If this is in a basement situation, the last step will not be aligned in rise to the rest of the stairs. There is no easy fix for this except perhaps framing a 3'x3' area that is the height of the last step and it's step down is separate from the staircase. The other extreme would be to put new stringers in modified to the new total rise!!! Lastly, if this is a gut and you are framing and such, the soul plates to the walls will be below the sub floor height. You might want to put filler boards or cross braces so that there is a raised sole plate above the sub floor height (so you can fasten the drywall and shoe molding into something. Hope that helps, Jeff

Can this be left exposed on a cement crawl space wall or should you cover it with dry wall for fire protection reasons?

Asked by Vin December 9, 2020
3
Answers

Yes, it can be left exposed. No need to cover it with drywall--besides, you would not want to have drywall in a crawl space as it would absorb moisture. However, be sure that there are not any vermin that would tend to chew on it.

I have an 1850 sq ft home. How many sheets of the foam board insulation would I need to insulate all floors underneath the house?

Asked by Hazel December 1, 2020
3
Answers

Each sheet is 32 ft2. Therefore, you would need ~58 sheets.

How much does it cost

Asked by Chase November 11, 2020
1
Answer

Hello Chase, please contact your local Home Depot for pricing information. Thank you for your inquiry!

Using 1.5 "4×8' for insulation ceiling of garage using screws and glue about 400 sq ' r 5 value ...

Asked by Ee October 12, 2020
3
Answers

Foam board has an insulation value R5 per inch of thickness. Typically in a garage you will want R19 or better on walls shared with the living area. So you are looking at a 4 inches of foam board--very, very expensive. And you will have to then cover the foam board with drywall, as fire code will not allow you to have exposed foamboard, as it throws off toxic gases when exposed to heat. If you can do it, it might be better to drywall the ceiling and then use blown-in insulation. Since it's a ceiling typically you would want R30. Easier to get there using blown-in insulation than foam board. Plus, it's an easy DIY project with 12 sheets of drywall. You can buy bags of insulation and spread with a rake, or blow it in yourself.

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

Customer Reviews

  • 4.8
    out of 252 reviews
  • 100% recommend this product
Filter by:
Showing 1-10 of 252 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.
by JR
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.
by ZJB
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.
by WildBill
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.
by Durwood
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.
by LargeMoreMoney
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
by Magic
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.
by NineMusesDesign
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.
by Bob
3 people found this helpful
Used for basement ceiling between rafters. Great...
Used for basement ceiling between rafters. Great
by HomeDepotCustomer
I used this product to insulate a steel building and...
I used this product to insulate a steel building and also used it to build a ice box for our tiny house camper.
by Chris
Showing 1-10 of 252 reviews