Model # 320821

Internet #202532854

Store SKU #614637

R-Tech 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing


1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing

  • Numerous household, hobby and construction uses
  • Easy to cut-to-size and to install
  • Poly-facer provides excellent durability & flexibility

Frequently Bought Together

Product Overview

R-Tech 1 in. x 4 ft. x 8 ft. Insulation Sheathing cuts easily to size. Facilitating its installation as wall sheathing, basement and foundation insulation or siding underlayment. This product meets federal guidelines for energy efficiency.

  • Designed for use as wall sheathing, basement and foundation insulation or siding underlayment
  • Energy Star qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings
  • Cuts easily to size to make installation a snap
  • Poly-facer on both sides for flexibility and durability
  • Moisture-resistant design to help maintain a water-tight seal
  • Note: Product may vary by store
  • How much do you need? Let our calculator help:
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Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

Is this material paintable with water base latex paint ?

Asked by: Richard
The answer is yes. But the real issue is that this material should NEVER be exposed anywhere. There are two reasons. One is that this is rather delicate material and will gouge easily and repair would be difficult. The biggest reason is that this material is highly flammable and will give off highly toxic smoke if it does catch fire. It should be used behind fire resistant material like sheet rock or even a layer of OSB or plywood would work.
Answered by: DIYguy
Date published: 2017-02-13

will this insulation work under a rubber roof?

I am looking at putting a rubber roof over a current flat roof will this insulation work or collapse when waked on? I am looking for a foam rigid type of insulation. the roof is not walked on but for installation it needs to be able to walk on.
Asked by: lemonbeagle1
This should not be walked on at least on a regular basis. It will flake easily and can be crushed. The best way to use this on a flat roof would be to insulate it from inside the structure in the ceiling or put some sheathing over it like plywood before putting on the roofing membrane.
Answered by: DIYguy
Date published: 2015-11-06

Can this Insulating Sheathing be used to Insulate dog houses?

Can this Insulating Sheathing be used to Insulate dog houses?
Asked by: Joey
Yes, BUT, you would need to cover the product on both sides so it is not exposed to the weather or to the inside.
Answered by: GFactor
Date published: 2017-02-11


Dear ArmstrongJ: No. Reducing noise transmission into / out of a room is difficult. Here are some recommendations: (1) Fill your ceiling joist bays and the wall stud bays with Roxul Safe 'n Sound, which improves insulation and dampens sound. See: Roxul Model # RXSS31525, Home Depot Internet #202531875 Store SKU #982937 (2) Seal all air openings: Gaps in the walls, e.g. around receptacles, will allow sound to pass through. Make sure all gaps are carefully sealed. DAP 230 is a good solution, with the 'Window and Door' version of Great Stuff foam for large spaces. (3) HVAC vents: Sound travels easily through the air -- including HVAC ducts and vents. If possible, seal all vents into and out of your room. (4) Double up your drywall: For the walls and ceiling, mount another layer of drywall over the first one, and use DAP 230 to 'glue' them together. Apply two full tubes of DAP 230 to each 4' x 8' panel. This will form a flexible connection between the sheets of drywall, to attenuate sound. You can use a few screws to hold the second interior sheet in place, but remove them after DAP dries. Leave a small gap around each edge and joint -- so the interior drywall sheet does not touch the floor or ceiling -- and fill the gaps with DAP 230. (5) Floor: Depending on how your home is constructed, noise will still be transmitted through the floor and wall joists. This is more difficult to block. DriCore panels will help on the floor. They have a rubber layer on the bottom to block moisture -- which also attenuates sound. Carefully seal all of the edges and joints with DAP 230. Then cover the DriCore with 1" of Foamular 250 foam board -- again applying tubes of DAP 230 between the DriCore and foamboard to create a layer that will attenuate sound. Then install 3/4" plywood for your new flooring. (Foamular 250 has 25 PSI of compressive strength, which is ideal for residential floors and concrete slabs.) I hope this is helpful, and best of luck with your project. Mark
Answered by: BvilleBound
Date published: 2017-02-18
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Customer Reviews

1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing is rated 4.9 out of 5 by 10.
Rated 5 out of 5 by from Excellent Bought 8 pieces and they worked perfect for what I needed them for.
Date published: 2016-12-14
Rated 5 out of 5 by from basement remodeling; awesome difference I put this up in my basement in a 14 yr old home that has no basement / cinder block type of foundation. Half of the foundation is below grade and the back 1/2 is above grade. Living in PA, there are many cold evenings and the home has always seemed cold. The basement being a huge area and not insulated at all. I have a YouTube video that I'll be posting shortly to show the dramatic difference. I applied the product to the basement walls ; Mylar side facing the block and adhered with liquid nails heavy duty due to cost and application of 60 panels. The glue DOES NOT affect this poly extruded foam from the Mylar and provides just enough grip to keep panels adhered. Took a thermal reading from the insulated walls and the UN-insulated block walls. 10 degree F change increase on the insulated side vs the non insulated block. I have owned this home for 5 yrs and wondered why it cost so much to heat. Well not anymore. I am in the midst of applying R13 faced insulated batts into 2x4 walls placed 1 inch away from the wall board; The difference is STAGGERING in home much heat retention is now in the basement. Best advice that I found is that the Mylar in basements faces out; and that liquid nails heavy duty is the best way to adhere and not damage the mylar. Even though liquid nails says it's not for plastic; it does work and is a very cost effective adhesive for these boards when used in larger liquid nails tube dispensers.
Date published: 2016-01-11
Rated 4 out of 5 by from this product needs proper instructions. No where on the product or on the instructions for installation does it say that the lettered polymeric facing should be removed before applying adhesive. None of the reviews comments on this either. This would be quite helpful to know.
Date published: 2015-04-17
Rated 5 out of 5 by from Works great, easy to cut and install! I recently used this type of insulation to insulate my garage. It was very easy to cut and install and was much less messy or itchy then using traditional fiberglass insulation. I put the insulation in, then sealed all edges with GreatStuff foam to ensure it was completely air and waterproof. I will definitely use this again and recommend to anyone when insulating a garage on a low budget.
Date published: 2013-11-06
Rated 5 out of 5 by from insulation I use this product for windows in the summer to keep the heat out I use it as a filler around the air conditioner
Date published: 2016-08-09
Rated 5 out of 5 by from You've heard of Multi-tasking? How about Multi-purpose! I am so delighted to share with The Home Depot customers, our finished set for "Other Desert Cities" which takes place on Christmas Eve, in a well to do home in Palm Springs, California. This set was made possible by 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing by Insulfoam available at your local Home Depot. The play was produced in Freeport, NY, coincidentally, the location of my Home Depot. And the play was wonderful, too. I normally design sets for my community theatre group on a stage. A typical three sided set. But in this case the director insisted on mounting the play on the floor, so I needed to create the illusion of the back wall of the living room. Most importantly, since the set had to be struck after each weekend performance, the “stone walls” had to be light-weight. I did a google search for “4 x 8 lightweight panels” and the Google gods brought me to R-Tech available at Home Depot. The R-Tech sheets anchored the entire set, providing a stone backdrop to the living room and although appearing to weigh a rock ton, could be picked up with one hand. In order to make the panels, we primed the printed side of the R-Tech sheets and then wallpapered with a water base glue. We then built wood frames and attached them from the front with small bolts and washers to prevent them sinking into the foam. Attaching braces allowed us to stand the panels up perfectly plum, enhanced by a lit Christmas Tree, a hand made free standing fire place and a giant palm tree. I didn't use this product for its designed purpose, but if you are looking for a 4 x 8 sheet of light weight material, paintable, wallpaperable and easy to handle, consider this. Might make a fantasy backyard castle. I also must complement the manufacturer, as I emailed them to ask their advice, and although, no one had ever asked if their product could be wallpapered, they responded with courtesy and suggested advice.
Date published: 2015-06-22
Rated 5 out of 5 by from Makes a great blocking board for knitters I purchased one of these boards to use for blocking knitted lace. It is thick, lightweight, and pinnable. I cut it in half and taped the edges. Store easily. Highly recommended as a blocking board.
Date published: 2013-09-30
Rated 5 out of 5 by from Great Skirting for 5th Wheel Winterizing! We used this to skirt around our 5th Wheel Camper in an RV Park. I felt the difference immediately inside the Camper. We put the foil to the outside to reflect the cold. One thing about styrofoam, is that it will hold in the cold or warmth, depending on what you want. So, after putting up, we slipped a small electrical heater through the last corner opening to give the warmth we wanted held in. After it reached a certain point, we took out the heater and closed the the corner end. Works Great! Remember even though pipes may be enclosed underneath, they CAN and DO FREEZE if you don't wrap outside pipes, and insulate. Don't ever leave an electric heater on unattended. But check your "R" factors; it's much better than the ReMax sheathing and far more economical. Did the job!
Date published: 2014-11-19
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