Model # W-N5150

Internet #100317819

Store SKU #440083

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


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

  • Energy efficient
  • For use in residential and commercial buildings
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Frequently Bought Together

Product Overview

R-Matte Plus-3/Thermasheath-3 is rigid foam plastic thermal insulation board. It is made 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 R-Matte 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 rigid foam board offers superior fire protection properties compared to any other rigid 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 transmission through studs
  • Lightweight and easily cut to size
  • How much do you need? Let our calculator help:
    Insulation calculator button

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

How much average per sheet

Asked by: Fred
Thank you for your recent inquiry with The Home Depot, Fred. This Rmax Thermasheath-3 1-1/2 in. x 4 ft. x 8 ft. R-9.6 Polyisocyanurate Rigid Foam Insulation Board is only carried in select Home Depot stores and not online. Please contact your local Home Depot Store for stock availability and pricing. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
Answered by: THDSupport
Date published: 2017-03-07

Home Depot does not sell this in my area (DFW) at least not within 100 miles. Where can I buy this?

Home Depot does not sell this in my area (DFW) at least not within 100 miles. Where can I buy this?
Asked by: Velocitysteve
Hi Velocitysteve, it looks like that this Foam Insulation Board is a store exclusive item and only able to be bought in a Home Depot store. Unfortunately we do not sell it with online stock for purchase. If you are unable to see the store inventory or price it is most likely either not a stocked item in your area or no longer available for purchase from I would advise you visit or contact your local Home Depot store for pricing and availability, or an alternate item. Please follow the steps below to localize your 1. Localize using your zip code (My Store Location: Change) 2. Choose the store where you want to pick up the item (Make this my Store) We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot!
Answered by: THDSupport
Date published: 2017-05-07

Can I glue this product? If so what do you recommend?

Can I glue this product? If so what do you recommend?
Asked by: Gary
Yes, you could use an adhesive or bonding agent such as Liquid Nails to secure this.
Answered by: CommunityAnswer
Date published: 2017-02-23

is a fire barrier like drywall needed

Can this be left exposed or does it need to have drywall overtop? I want to glue this to exposed concrete block walls in my basement and garage.
Asked by: steve
This product cannot be left exposed. From the manufacturers sell sheet: DO NOT leave Thermasheath-3 exposed. Polyiso foam is an organic material which will burn when exposed to an ignition source of sufficient heat and intensity and may contribute to flames spreading. Installations utilizing Thermasheath-3 must be fully protected on the interior side of the building by a thermal barrier such as a minimum of 1/2 inch gypsum wallboard.Masonry or concrete that is a minimum of one inch thick, plywood that is a minimum of 1/2 inch thick and wood that is a minimum of one inch nominal thickness may also be recognized as suitable thermal barriers
Answered by: Stephen
Date published: 2017-02-23
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Customer Reviews

Rmax Thermasheath-3 1-1/2 in. x 4 ft. x 8 ft. R-9.6 Polyisocyanurate Rigid Foam Insulation Board is rated 4.9 out of 5 by 8.
Rated 5 out of 5 by from 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.
Date published: 2012-10-22
Rated 5 out of 5 by from Super quality This is the second garage door I have insulated. I was particularly pleased with the density of the 'poly' and was glad to find a product with a great R factor-nearly twice that of the next best. Have recommended to family and friends. A little more cost was definitely worth it. Garage is much cooler. Daryl Provo, Utah
Date published: 2016-08-16
Rated 5 out of 5 by from SUPERIOR Garage Door Insulator I researched kits for insulating my garage door for sound & temperature and found that this was comparable in price, That was the only thing comparable, as everything else about this product was SUPERIOR!!!! I did identify two "cons" about the product, but they're not really negatives, just realities. Here's why you should but this stuff for your garage door: 1) Higher R factor because of the material and I chose the maximum thickness that would fit in my garage door panels 2) Non irritant like the pink, fiberglass, cotton candy (tastes better too!) 3) Firm sheets made measuring and marking with a sharpie and a straight edge super easy 4) Full sheet allowed for panels to be cut bigger than pre-cut ones in kit 5) Easily cut with sharpened side of a putty knife (found tip on line) 6) Perfect cuts on table saw! (used only this method after I tried it with amazing success) 7) Firm, easy to work with pieces easily allowed for puzzle-like assembly around windows 8) Cut panels just right so they slip into panel frames and no connectors needed 9) Foil facing is universal, so if you want to use connectors or adhesive (I used a very small amount of liquid nails for each panel, but I am the Unnecessary Over-Engineer!) 10) Clean up was easy and minimal with a shop vac, unlike what people say about the mess from the styrofoam kits 11) Foil tape matched the product perfectly and covered any flaws from the learning process as well as kept small pieces around the window secured to each other. Also great for patching inevitable future punctures. 12) One side is plain (which I tried to always face outwards, but sometimes I blew it) but the printing on the other side of the facing came off easy with acetone, to leave a simple, silver, series of panels without some company's logo, instructions, warnings, and disclaimers. This product was so ideal, it placed the success of the project on my shoulders. If something went wrong, it would have been due to "operator error". I could immediately tell the difference in temperature and didn't need a sweatshirt at night during winter. The difference in sound was surprising because now sometimes I don't even hear someone in the family pull into the driveway and only know they've arrived home when they come looking for me in the garage. An unexpected bonus is that the garage door is quieter opening and closing with the insulation keeping parts from rattling and absorbing vibration from motion. Waiting for summer to see the difference in heat and will try and return to give that info. The Unnecessary Over-Engineer
Date published: 2016-03-29
Rated 5 out of 5 by from 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.
Date published: 2012-07-26
Rated 4 out of 5 by from Great for builidng hexayurts Excellent product for building hexayurts. The 1" panels are ideal. However the 1.5" panels work well too.
Date published: 2013-06-12
Rated 5 out of 5 by from Great for insulating Arizona garages Arizona just got into the triple digits this week, so I decided it was a good time to insulate my 2 garage doors. I did a lot of research online and this product seemed superior and is more than double the R value of the pre-cut garage door insulating kits. I cut mine with a linoleum knife and that worked, but heat cutting with an old steak knife (heated in a bowl or grill of coals) might work better. Search YouTube for videos on this. I just didn't feel like going the heat cutting route when it was 100+ degrees inside the garages! I got 4 pieces to fit my garage door voids out of each one of these big sheets - I cut them down to 44.5" x 19.5" pieces. Some had to be adjusted when placing them in the garage door voids since they were slightly different sizes. The foam will make a BIG mess but it's nothing a shop vac can't handle. The foam is harmless and does not itch or irritate your skin, so no need to wear gloves. For 24 voids (8 in a 1 car door and 16 in a 2 car door) it took me about 5 hours of work.
Date published: 2015-05-31
Rated 5 out of 5 by from 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.
Date published: 2014-06-04
Rated 5 out of 5 by from Great for Garage Door Insulation R10 Here in Maryland, I used two sheets of this materiel to insulate my single car garage door. Light weight and about R10 with aluminum tape to hold it in place. Looks sharp, took 1 hour to do and makes garage cooler in summer warmer in winter. 60 dollar project overall. However, I am stumped that my dad cannot purchase this very same product in Florida ANYWHERE! Not sure why some states do NO carry this product at Home Despot. Strange.
Date published: 2016-06-04
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