Model # 37L

Internet #100320340

Store SKU #104863

Store SO SKU #192627

Owens Corning FOAMULAR 3/4 in. x 4 ft. x 8 ft. R-4 Tongue and Groove Insulating Sheathing

Owens Corning

FOAMULAR 3/4 in. x 4 ft. x 8 ft. R-4 Tongue and Groove Insulating Sheathing

  • Film faced for damage resistance, easy to handle, cut and install
  • Compressive strength of 15 psi, R-value of 4
  • Lifetime Limited Warranty for the life of the home
store icon Loading Buying Options...
package icon Loading Buying Options...
Sorry, but we ran into issues loading these options. Please try refreshing.

Frequently Bought Together

Product Overview

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: 3/4 in. x 4 ft. x 8 ft.
  • Application: Exterior Above Grade Walls, Underneath vinyl siding / claddings
  • Closed cell rigid foam board, 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
  • Buying guide and insulation calculator:

    insulation buying guide
    Insulation calculator button

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents.  Download a free copy from the Adobe Web site.



Product Depth (in.)
Product Height (in.)
Product Length (ft.)
8 ft
Product Thickness (in.)
.75 in
Product Width (in.)


Faced or Unfaced
Insulation Application Type
2x4 Walls,2x6 Walls,Exterior Sheathing
Insulation R-Value
Insulation Type
Product Weight (lb.)
Sheathing Type

Warranty / Certifications

Warranty Information
Lifetime Limited

More Products With These Features


Customer Questions & Answers

I am considering this product to insulate a garage closet. For fire purposes, would it need to necessariy be covered? Can it be painted?

Asked by: speed
I has to be covered with 1/2 drywall to meet building code. This product is very toxic if it burns in side your home "It will kill you" if the fumes are inhaled
Answered by: enjoyingflorida
Date published: 2015-11-07

Can this be painted to usee as a prop in a theater play

Asked by: Joe
Yes, but not using spray paints (generally). They'll dissolve the foam.
Answered by: KS80537
Date published: 2016-12-09

is this rated at 25 pounds per square inch?

Asked by: Anonymous
I don't know what you want to know and don't know about compression but has almost none tensile or shear strength. Place a piece between two separated four by fours and step in the middle and see if you are satisfied about the strength.
Answered by: OLDG
Date published: 2016-12-07

Price? Not in stores? Special Order?

Asked by: Anonymous
In store best. If too many sheets you can easily return extra and no shipping charge either way.
Answered by: OLDG
Date published: 2016-05-01
  • y_2017, m_8, d_18, h_13CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_33
  • loc_, sid_100320340, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=BEST_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=POSITIVE_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 104ms

Customer Reviews

FOAMULAR 3/4 in. x 4 ft. x 8 ft. R-4 Tongue and Groove Insulating Sheathing is rated 4.6 out of 5 by 9.
Rated 5 out of 5 by from Easy to work with and great insulation I've used this product to insulate the back of my garage door, as well as other applications where full batt inslulation isn't required. It's easy to cut (score and break), lightweight, and easier to work with than fiberglass (no mess). I'd recommend it to anyone.
Date published: 2009-11-15
Rated 5 out of 5 by from does its job purchased 6 sheets to insulate an 8x10 utility shed converted into a cat barn. it has allowed me to turn the thermostat down on the oil heater from previous years. i would say that the barn is now 15-20 degrees warmer than what it's been in the past. i forgot that cats have toenails and enjoy kneading them on each other, me and walls. they've shredded some sheets after 3 months but not severely enough to affect the R value.
Date published: 2014-01-14
Rated 5 out of 5 by from Did the job! Easy to cut and install. Priced well. Performed as expected.
Date published: 2016-08-23
Rated 5 out of 5 by from Easy DIY option I have a strange situation here in my addition where there is a closet up next to the exterior wall, of which previously only had paneling directly on the studs with the 3" fiberglass, this was causing a huge amount of heat loss. If you have a similar situation, this will be great for right against the studs, and then wallboard on top of that. (It's recommended online you also use a plastic vapor barrier.) This is working great as extra protection over the 3" fiberglass. This works out to a combined R17, higher is always better, but this cuts down on the cold drafts significantly - more than enough for similar situations. (Tip: Not sure if this is the 'right' way to do this, but on the seems if you have any leaks, as you probably will unless you're an expert at cutting the stuff - use foil HVAC tapes to cover the seems.)
Date published: 2014-01-28
Rated 4 out of 5 by from Easy to install, lightweight, dual purpose We've not completed the basement yet, but the Foamular went up pretty easy. There was some problems with adhesive not holding but that wasn't this product's issue. some sheets did have a bit of warp to them so it was hard to keep them flat against the wall. We finally used some spare 2x4's to hold the sheets in place overnight until the glue set.
Date published: 2013-10-29
Rated 5 out of 5 by from PERFECT FOR THE JOB. I've looked in a lot of places for a insulation board for flood zone areas and this is the best solution for the job. This is a good deal.
Date published: 2012-07-10
Rated 5 out of 5 by from Vapor barrier(poly) on the inside wall. If you install a vapor barrier (poly or similar material) make sure it is on the cold side and not on the inside. It can be very destructive to your wall construction, causing rapid rot and mold/mildew. This product breaths and is not a vapor barrier. Check with you local city inspector if you aren't sure.
Date published: 2014-02-18
Rated 4 out of 5 by from Not perfectly flat, hard to glue in place without bracing Easy to cut, easy install with the right glue, and tape, as long as you brace the board, since it does not lay flat. Just a pain to adhere to vertical services.
Date published: 2013-01-22
  • y_2017, m_8, d_18, h_2
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_9
  • loc_, sid_100320340, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 110ms