Rmax Thermasheath 3 R-9.6 1 1/2 in. x 4 ft. x 8 ft. Polyiso Rigid Foam Insulation Board-W-N5150 - The Home Depot
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Rmax Thermasheath

Model # W-N5150

Internet # 100317819

Store SKU # 440083

3 R-9.6 1 1/2 in. x 4 ft. x 8 ft. Polyiso Rigid Foam Insulation Board

Rmax Thermasheath 3 R-9.6 1 1/2 in. x 4 ft. x 8 ft. Polyiso Rigid Foam Insulation Board

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

$27.35 / each


Model # W-N5150

Internet # 100317819

Store SKU # 440083

R-Matte Plus-3/Thermasheath-3 is rigid foam plastic thermal insulation board composed of environmentally sound, closed cell, polyisocyanurate foam bonded to a durable white-matte (non-glare) aluminum facer and a reflective reinforced aluminum facer. This product is suitable for use in wall sheathing applications in new residential, commercial and agricultural buildings and for thermal retrofit construction to existing buildings. This Energy Star qualified Rmatte Plus-3/Thermasheath-3 provides R9.6 with dimensions of 1.5 in. x 4 ft. x 8 ft. This product is designed for exterior and interior, non-structural uses.

  • Rmax Polyiso sheathing offers the GREATEST R-value per inch currently available in a rigid foam board.
  • R-Matte plus-3/Thermasheath-3 is applied to the exterior or interior face of wood or metal studs to cover all studs, sills, plates and header constructions, thereby providing insulation over areas not normally covered by insulation products
  • Superior resistance to moisture and vapor in above grade applications.
  • Polyiso ridgid foam board offers superior fire protection properties compared to any other ridgid foam board insulation.
  • Energy Star qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings.
  • When taped and flashed, the Rmax Polyiso board greatly reduces air infiltration and prevents thermal bridging caused by heat and cold tranmission through studs.
  • Lightweight and easily cut to size

Info & Guides

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Assembled Depth (in.) 
1.5 in 
Assembled Height (in.) 
96 in 
Assembled Width (in.) 
48 in 
Product Length (ft.) 
8 ft 
Product Thickness (in.) 
1.5 in 
Product Width (in.) 
Insulation Application Type 
2x4 Walls,2x6 Walls,Basements,Ceilings,Exterior Sheathing,Exterior Wall Foundation,Garage,Re-Siding 
Insulation Type 
Product Weight (lb.) 
7 lb 
R Value 
Sheathing Type 
Warranty / Certifications
ENERGY STAR Certified 
Warranty Information 
Standard Warranty 


Rated 4.8 out of 5 by 4 reviewers.
Rated 5.0 out of 5.0 by Excellent for garage door insulation Used this foam to insulate my East facing garage door in AZ. 6 sheets did my entire 3 car garage. I measured temps of 135F in the garage before using now the highest measured temp in the summer is 98F. Reduced temperatures in the rooms above the garage by about 8 degrees. I was able to cut this to size and friction fit. No adhesives necessary. Don't waste your money on a garage door insulation "kit". As a note, I used the panels that had foil on both sides. It acts as a great sound barrier too. October 22, 2012
Rated 5.0 out of 5.0 by Much better than styrofoam If you have to cut your sheathing, use this product. Do not use Styrofoam products even though they are cheaper and more plentiful. If your store doesn't have it ask for it to be brought in. Cuts great with saw or knife. July 26, 2012
Rated 4.0 out of 5.0 by Great for builidng hexayurts Excellent product for building hexayurts. The 1" panels are ideal. However the 1.5" panels work well too. June 11, 2013
Rated 5.0 out of 5.0 by Great garage door insulation! After a lot of research, I chose this product for insulating my east facing AZ garage door. The R-value on this product is as high as you can get for rigid foam (and MUCH better than the white stuff that comes in the kit). I was able to do my 2-car garage door (with a row of windows on top) with three pieces. If I were going to cover the complete top row (instead of just around the windows) I would have needed another piece. It made a huge difference in my garage! Before I did it, the garage was always 20-30 degrees hotter in the summer. Now the stays cooler longer in the morning and at its hottest gets to about the same temp as outside. It's actually cool enough to work in there now! I was able to cut to fit and fit it in without any adhesives. It can be cut with a long razor blade or scored and broken pretty easily. Took me a few hours to do the entire thing. I used some foil tape to seal any exposed edges and make it look nicer. Don't buy the kits! Buy this instead. Four pieces is cheaper than the two of the kits you need to do a garage door and it looks and works better. June 3, 2014
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Store Exclusive. This item is available for purchase in select stores only.