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

  • Easy to cut, split and install
  • Energy Star qualified
  • 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
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Frequently Bought Together

Product Overview

  • Easy to cut, split and install
  • Energy Star qualified
  • 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
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

Product Overview

  • Easy to cut, split and install
  • Energy Star qualified
  • 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
Model #: 320821
Sku #: 614637
Internet #: 202532854

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

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Specifications

Dimensions

Product Depth (in.)
1
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
2x4 Walls,2x6 Walls,Attics,Basements,Crawlspaces,Exterior Sheathing,Exterior Wall Foundation,Garage,Under Slab
Insulation R-Value
3.85
Insulation Type
Sheathing
Interior/Exterior
Interior/Exterior
Product Weight (lb.)
2.7lb
Sheathing Type
EPS
Structural
Yes

Warranty / Certifications

Warranty Information
N/A

Specifications

Dimensions

Product Depth (in.)
1
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
2x4 Walls,2x6 Walls,Attics,Basements,Crawlspaces,Exterior Sheathing,Exterior Wall Foundation,Garage,Under Slab
Insulation R-Value
3.85
Insulation Type
Sheathing
Interior/Exterior
Interior/Exterior
Product Weight (lb.)
2.7lb
Sheathing Type
EPS
Structural
Yes

Warranty / Certifications

Warranty Information
N/A

Questions & Answers

Is the sheathing reflective?

Is the sheathing reflective?
Asked by: Pete
Dear Pete: R-Tech foam board is available with foil or poly facing. According to the description on the Home Depot website, the version available in the stores and online has poly facing on both sides. You can, however, order the version with foil facing from your Home Depot's Customer Service or Pro Desk. Many retail customers are not aware of this service; Home Depot sells a much wider range of building products than what you see on the shelves. We often order special decking, PVC trim, insulation etc. via the Pro Desk. They offer competitive prices and can deliver to the store or to your home or job site. I hope this is helpful, Mark
Answered by: BvilleBound
Date published: 2017-09-19

What is the R value of this product?

What is the R value of this product?
Asked by: Bob
3.85 per inch of thickness , this is in comparison to fiberglass batting which is 2.9 to 3.8 r rating per inch in thickness. Usually wall batting fiberglass has r-15 for a standard studded wall 2x4.
Answered by: FrankieG
Date published: 2017-09-04

Can I use this on the exterior roof of my RV to reflect heat?

Asked by: Bob
Dear Bob: No. R-Tech foam board is not designed for extended exterior exposure. Second, the silver foil surface will corrode and lose reflectivity. Third, foam board is flammable and must be covered by an approved thermal barrier. Fourth, it would be very difficult to fasten foam board to the roof of your RV. The best option for your roof is a high quality bright white paint which will reflect almost all of the infrared solar energy. You will need to keep it clean, however. I hope this is helpful. Mark
Answered by: BvilleBound
Date published: 2017-09-06

Can this be used on the outside of a house with vinyl siding being installed over it?

Can this be used on the outside of a house with vinyl siding being installed over it?
Asked by: Steve
This is not a good product to be used in possible moist environments such as outside and especially sub grade. It is "expanded" polystyrene (EPS) and not the preferred "extruded" polystyrene (XPS). For outside use I would look at the Owens Corning XPS rigid foam which has very little water absorption (0.5%) compared to EPS foam (2-3%). Water is an excellent conductor of energy and therefor will reduce insulating ability accordingly. Granted EPS under vinyl siding will not be in a high moisture area but it can still absorb moisture through condensation which will happen to some extent. XPS is more money by about 40% but is a much better product for what you propose. But to answer your question the answer is yes, it can be used under vinyl siding. It's just not the preferred product.
Answered by: DIYguy
Date published: 2017-06-06
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Customer Reviews

1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing is rated 4.8 out of 5 by 17.
Rated 5 out of 5 by from This product is great to work with for making props for theater. Been working with it for years. ... This product is great to work with for making props for theater. Been working with it for years. It cuts easy with a fine tooth saw blade. Razor knife or hot blade. Glues easy . Lite weight. . It also uses great for what it's intended for we use it for many applications installation for everything from attic, crawl space, to making custom insulated cooling rooms. If you remove the foil or clear backing the use of solvent paints could eat into the material.
Date published: 2017-06-11
Rated 4 out of 5 by from 4 Star Review Rating provided by a verified purchaser
Date published: 2017-09-27
Rated 4 out of 5 by from Backing could be more secure.... Backing could be more secure.
Date published: 2017-08-15
Rated 5 out of 5 by from great, better than expected... great, better than expected
Date published: 2017-06-20
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 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 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
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