Model # 320821

Internet #202532854

Store SKU #614637

R-Tech 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
0732813100072

R-Tech

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
$13.75 /each

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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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Customer Questions & Answers

37 Questions56 Answers

Customer Questions & Answers

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

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3 answers

Is this material paintable with water base latex paint ?

This question is from 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
Asked by
Indianola , Utah
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January 26, 2015
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Answers (3)

Asked by
Portland, OR
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Home Improvement Profile: DIYer
October 23, 2015
Answer: 
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 Read More
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. Read Less
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Asked by
Freeport, NY
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June 22, 2015
Answer: 
Yes, I painted the printed side with water based paint. Peeled up in places, but I just needed to prime it for wallpaper.
I used latex paint. Might be different if you use actual primer.
Good luck.
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February 3, 2015
Answer: 
You can use a water based paint
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3 answers

will this insulation work under a rubber roof?

This question is from 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
Asked by
laurens new york
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October 21, 2014
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.
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Asked by
Portland, OR
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October 23, 2015
Answer: 
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.
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Asked by
Hermiston, OR
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November 19, 2014
Answer: 
You couldn't walk on this. unless you put 2x4 cross braces, or boards and put the sheathing in-between, with the rubber roof over that, then it could work. "Rubber roof' is an interesting concept.
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October 27, 2014
Answer: 
Thank you for your recent inquiry with The Home Depot. Because this item is only available in Home Depot stores, I believe the best advice would be to talk to one of our many specialty department professionals at your local Home Depot store. For any other questions, please visit your nearest local Home Depot store or call us at HomeDepot.com Customer Service 800-430-3376.
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2 answers

Is it also a moisture barrier??

This question is from 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
Asked by
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October 25, 2016
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Asked by
Portland, OR
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Home Improvement Profile: Professional
October 26, 2016
Answer: 
Moisture barrier is a really loose term. In many situations no moisture barrier is needed. Installing moisture barriers as a common practice is not based on sound science.
The purest defining of moisture barrier is to prevent moisture from migrating from one area to another. This can be devastating in the high humidity areas. Moisture needs to migrate out of building materials and using a moisture Read More
Moisture barrier is a really loose term. In many situations no moisture barrier is needed. Installing moisture barriers as a common practice is not based on sound science.
The purest defining of moisture barrier is to prevent moisture from migrating from one area to another. This can be devastating in the high humidity areas. Moisture needs to migrate out of building materials and using a moisture barrier can actually hold existing moisture in making things worse.
To answer your question this can be used as a moisture barrier. It will stop or reduce (I can't use the word re-tard) the movement of moisture to the other side. But it will also hold in moisture.
I am sure that is as clear as mud. Read Less
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Asked by
Boston, MA
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Home Improvement Profile: Professional
October 26, 2016
Answer: 
Dear 07753: Yes. The 'perm' rating is <1.0, according to the spec sheet available on the Home Depot website. You can find details like these for most products under "Info & Guides" next to the Product Overview. A screen cap is attached below that highlights this part of a Home Depot product page.

If you plan to install foam board on the outside of your house over your sheathing, a few notes and
Read More
Dear 07753: Yes. The 'perm' rating is <1.0, according to the spec sheet available on the Home Depot website. You can find details like these for most products under "Info & Guides" next to the Product Overview. A screen cap is attached below that highlights this part of a Home Depot product page.

If you plan to install foam board on the outside of your house over your sheathing, a few notes and suggestions:

(1) Thickness to prevent condensation: The foam board must be thick enough to prevent condensation on the sheathing of your house during the winter -- which can lead to rot, particularly with cheap OSB sheathing. The required thickness depends on the climate zone you live in; do a Web search for "DOE climate zone map". Here is a table with the minimum thickness depending on the zone you live in and the type of wall:

Climate Zone Minimum R-Value of Foam Sheathing
Marine Zone 4: R-2.5 for 2x4 walls; R-3.75 for 2x6 walls
Zone 5: R-5 for 2x4 walls; R-7.5 for 2x6 walls
Zone 6: R-7.5 for 2x4 walls; R-11.25 for 2x6 walls
Zones 7 and 8: R-10 for 2x4 walls; R-15 for 2x6 walls
We recently completed a deep remodel for a house in Massachusetts, for example, and wrapped the entire house with 2" of Foamular foam board. 2" = R-10, which is required in our area to prevent condensation. This also boosts the insulation for the home, so it is a win-win. (A photo is attached.)
(2) Type of foam board: We prefer XPS foam board because it has a higher R-value: R-5 per inch. In addition, XPS does not absorb water -- always a concern on exterior surfaces. Polyisocyanurate foam board provides slightly high R values, but absorbs water like a sponge.
(3) Stop air leaks: Seal all of the joints and edges to block air leaks. DAP 230 sealant is best of small gaps. The 'Windows and Doors' version of Great Stuff foam is a good solution for larger gaps; the cured foam remains flexible to stop cracks as things expand and contract.
(4) New trim: If you wrap your house with foam board, you will also need to replace the trim around windows and doors. Use Home Depot's Veranda PVC trim boards instead of wood. PVC never rots and never needs to be repainted -- as long as you want white trim. If you do want a different color, the PVC surface is much better for paint than wood. It cuts and installs easily; always use stainless screws to avoid any rust spots down the road. CorTex screws work well; caps are included to fill the screw holes. See: Veranda Model # H190OWS3, Home Depot Internet # 100244007 Store SKU # 254294 and Cortex Model # FMCTXT-VA50SMHD, Home Depot Internet #203705494 Store SKU #822865 Store SO SKU #336802 (A photo is attached.)
I hope this is helpful.

Mark
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2 answers

can i use it to insule a complete concession tráiler?

This question is from 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
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October 5, 2016
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Answers (2)

October 26, 2016
Answer: 
Dear Jesus: Yes, but two suggestions:

(1) Foam board is flammable so DO NOT install any foam board product near any source of heat, e.g. your cook top. If you need to insulate near a hot surface, use Roxul ComfortBoard -- which provides R-4 per inch, and is not flammable. See: Roxul Model # RXCB11224, Home Depot Internet #206789748 Store SKU #1001748089.

(2) Thermal barrier: When foam board burns
Read More
Dear Jesus: Yes, but two suggestions:

(1) Foam board is flammable so DO NOT install any foam board product near any source of heat, e.g. your cook top. If you need to insulate near a hot surface, use Roxul ComfortBoard -- which provides R-4 per inch, and is not flammable. See: Roxul Model # RXCB11224, Home Depot Internet #206789748 Store SKU #1001748089.

(2) Thermal barrier: When foam board burns it creates toxic gas -- so it MUST be covered by a 'thermal barrier'. In a home, the standard is 1/2" drywall. This obviously will not work in a trailer, so it would be much better to use Roxul ComfortBoard throughout -- rather than foam board.

I hope this is helpful,

Mark
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Asked by
California
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Home Improvement Profile: Professional
October 6, 2016
Answer: 
Howdy Jesus,
Yes this could be used. Since it does not have a "finished" look it is generally used for underlayment of siding.
Happy siding,
Coach Dave
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Customer Reviews

Rated 4.9 out of 5 by 9 reviewers.
Rated 5.0 out of 5.0 by 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. January 11, 2016
Rated 5.0 out of 5.0 by 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 August 9, 2016
Rated 5.0 out of 5.0 by 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. June 22, 2015
Rated 5.0 out of 5.0 by 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. November 6, 2013
Rated 5.0 out of 5.0 by Great behind my Orca Grow Film I have little light in my living room where a clerestory keeps the room lovely cool during the summer. But, during the winter my plants are light deprived. So, I got Orca Grow Film reflective wall covering to see how it works. It helped amazingly! But, since I heat with candles it also showed some jelly fish shaped marks where there must have been condensation from the temperature difference between my room temperature and the outside wall's temperature. I had the Orca applied so that there was an inch of air space which a YouTube video said would work to insulate. Now that the R-Tech has been slipped into the inch space the condensation problem appears to be solved. The R-Tech is really easy to work with, a steak knife cut it with hardly any mess. I highly recommend it. (And, it's quite a beautiful, intense white.) January 21, 2012
Rated 5.0 out of 5.0 by 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. September 30, 2013
Rated 5.0 out of 5.0 by 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! November 19, 2014
Rated 4.0 out of 5.0 by 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. April 17, 2015
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