0732813100072

R-Tech

Model # 320821

Internet # 202532854

Store SKU # 614637

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

$13.75 /each
  • 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:
    Insulation calculator button

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents.  Download a free copy from the Adobe Web site.

Specifications

Dimensions

Product Depth (in.) 
Product Height (in.) 
96 
Product Length (ft.) 
8 ft 
Product Thickness (in.) 
1 in 
Product Width (in.) 
48 

Details

Faced or Unfaced 
Faced 
Insulation Application Type 
Attics,Basements,Crawlspaces,Exterior Sheathing,Exterior Wall Foundation,Garage,Under Slab,2x4 Walls,2x6 Walls 
Insulation R-Value 
3.85 
Insulation Type 
Sheathing 
Interior/Exterior 
Interior/Exterior 
Product Weight (lb.) 
2.7 lb 
Sheathing Type 
EPS 
Structural 
Yes 

Warranty / Certifications

ENERGY STAR Certified 
Yes 
Warranty Information 
N/A 

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Customer Questions & Answers

31 Questions49 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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Answers (3)

Asked by
Portland, OR
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Home Improvement Profile: DIYer
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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Home Improvement Profile: DIYer
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

Stop metal carport roof drips

This question is from 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
Asked by
Roswell NM
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February 28, 2016
Can I use this to stop metal carport roof drips due to condensation? (The drip lines are 9" apart, corresponding to the roof panel ribs--NOT due to leakage at the seams of the metal roof panels.) My plan is to screw 2x2s to the inside aluminum channels that support the roof, overhead only, then attach 1"x4'x8' to the 2x2s, using something like Grip-Rite #12 x 1-3/4 in. Plastic Round Cap Roofing Nails. I would leave the carport sides open, to allow airflow between the insulation and the roof.
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Answers (2)

Asked by
Massachusetts
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Home Improvement Profile: Professional
June 25, 2016
Answer: 
Dear Sundog: As JMoore noted, adding foam board under the metal roof would not stop condensation. You would need to seal the bottom of the metal roof to block the flow of moist air from reaching the metal surface. There are probably a number of options, depending on how your carport is constructed. The goal would be to create a sealed air pocket under the metal roof.

Please note, however, that foam
Read More
Dear Sundog: As JMoore noted, adding foam board under the metal roof would not stop condensation. You would need to seal the bottom of the metal roof to block the flow of moist air from reaching the metal surface. There are probably a number of options, depending on how your carport is constructed. The goal would be to create a sealed air pocket under the metal roof.

Please note, however, that foam board is very flammable and must be covered by an approved thermal barrier in any occupied space, including a garage. The standard is 1/2" drywall. Given that you want to simply create a sealed air pocket, you could use a variety of other materials. The air pocket itself could be created with poly sheeting, for example, sealed at the edges with DAP 230 -- covered for appearance with wood panels mounted on the 2x2s, as you described.

I hope this is helpful.

Mark
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Asked by
Minnesota
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Home Improvement Profile: Professional
March 4, 2016
Answer: 
This problem is due to warm moist air contacting a cold surface. The insulation alone will not likely stop the condensation problem. I would look into air-flow to resolve the problem-venting.
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2 answers

Can I use it on an interior block walls as insulation. I'm building a house of concrete blocks it gets hot and cold.

This question is from 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
Asked by
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February 7, 2016
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Answers (2)

Asked by
Massachusetts
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Home Improvement Profile: Professional
June 25, 2016
Answer: 
Dear Julian: Yes, foam board provides very efficient insulation with R5 per inch of thickness. There are two caveats, however:

(1) Foam board is very flammable and generates toxic gas when it burns. So it MUST be covered by an approved thermal barrier, e.g. 1/2" drywall.

(2) Start by installing continuous sheets mounted on your concrete block walls, then build your interior stud wall in front of
Read More
Dear Julian: Yes, foam board provides very efficient insulation with R5 per inch of thickness. There are two caveats, however:

(1) Foam board is very flammable and generates toxic gas when it burns. So it MUST be covered by an approved thermal barrier, e.g. 1/2" drywall.

(2) Start by installing continuous sheets mounted on your concrete block walls, then build your interior stud wall in front of the layer of foam board. This will isolate your interior walls from the heat / cold of the concrete block. (There must be a firebreak in the foam board every 10 feet along the wall, e.g. a gap behind one of the studs that you fill with stone wool.)
(3) If you live in an area with very hot summers and/or cold winters, you could also fill the stud bays with more foam board or Roxul ComforBatts. This will significantly improve the total insulation of your wall, to meet current standards. Note: whether you use foam board or Roxul, seal all of the edges, gaps and holes to block air leaks. The 'Windows and Doors' version of Great Stuff foam works well; the cured foam remains flexible to block cracks as things expand and contract.

We recently completed a deep remodeling project in Massachusetts, for example, where we filled the stud bays with sheets of XPS foam board -- and wrapped the outside of the house with 2" of XPS. A few photos are attached.

I hope this is helpful, and best of luck with your project.

Mark
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February 8, 2016
Answer: 
Hi Julian,
Yes, this insulation may be used on interior walls, carefully follow the manufactures installation instructions for the best results.
Mike
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Customer Reviews

Rated 4.9 out of 5 by 8 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 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 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
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 5.0 out of 5.0 by this product was sealed on both sides this product was easy to work with. i used it for forming mountains and riverbeds for a train layout. As the product had both sides sealed it was clean and easy to work with. August 13, 2013
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