Owens Corning FOAMULAR 3/4 in. x 4 ft. x 8 ft. R-4 Tongue and Groove Insulating Sheathing-37L - The Home Depot

Owens Corning

Model # 37L

Internet # 100320340

Store SKU # 104863

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

This item has been discontinued.
The Home Depot no longer carries this specific product.

  • 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


Model # 37L

Internet # 100320340

Store SKU # 104863

Store SO SKU # 192627

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

Info & Guides

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Assembled Depth (in.)  .75 in  Assembled Height (in.)  96 in 
Assembled Width (in.)  48 in  Product Length (ft.)  8 ft 
Product Thickness (in.)  .75 in  Product Width (in.)  48 
Faced or Unfaced  Faced  Insulation Application Type  Exterior Sheathing 
Insulation Type  Sheathing  Interior/Exterior  Exterior 
Product Weight (lb.)  3.9 lb  R Value 
Sheathing Type  XPS  Structural  No 
Warranty / Certifications
ENERGY STAR Certified  Yes  Warranty Information  Lifetime Limited 


Rated 4.5 out of 5 by 8 reviewers.
Rated 5.0 out of 5.0 by 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. January 14, 2014
Rated 5.0 out of 5.0 by 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. November 14, 2009
Rated 4.0 out of 5.0 by 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. October 29, 2013
Rated 5.0 out of 5.0 by 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.) January 28, 2014
Rated 5.0 out of 5.0 by 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. July 9, 2012
Rated 5.0 out of 5.0 by 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. February 18, 2014
Rated 3.0 out of 5.0 by Some wrong sizes were in the order The product performs as intended. The quality of the wood pieces allow me to construct a square frame that will enclose the foamular support structure for my canvases. December 11, 2013
Rated 4.0 out of 5.0 by 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. January 22, 2013
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Store Exclusive. This item is available for purchase in select stores only.