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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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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



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Info & Guides

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

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current product
1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
BrandSTYRO IndustriesSTYRO IndustriesR-Tech
NameFP Ultra Lite 1 in. x 2 ft. x 4 ft. Stucco Grey Foundation PanelFP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing
Price
Ratings
(38)
(7)
(275)
Product Thickness (in.)121 in
Insulation LocationExterior Wall FoundationExterior Wall Foundation2x4 Wall,2x6 Wall,Attic,Basement,Crawlspace,Exterior Sheathing,Exterior Wall Foundation,Garage,Under Slab
Insulation R-ValueR5R10R3.85
Sheathing TypeXPSXPSEPS
Insulation FeaturesMold Resistant,Paintable,Water ResistantMold Resistant,Paintable,Water ResistantStructural
Product Length (ft.)228 ft
Compatible Install SurfaceCement,Concrete,Existing InsulationCement,Concrete,Existing InsulationCement,Concrete,Existing Drywall,Plywood,Wood
Coverage Area (sq. ft.)8832
Faced or UnfacedFacedFacedFaced
Interior/ExteriorExteriorExteriorInterior/Exterior
View ProductView ProductView Product

Specifications

Dimensions

Coverage Area (sq. ft.)
32
Product Length (ft.)
8 ft
Product Thickness (in.)
1 in
Product Width (in.)
48 in

Details

Compatible Install Surface
Cement,Concrete,Existing Drywall,Plywood,Wood
Faced or Unfaced
Faced
Insulation Features
Structural
Insulation Location
2x4 Wall,2x6 Wall,Attic,Basement,Crawlspace,Exterior Sheathing,Exterior Wall Foundation,Garage,Under Slab
Insulation R-Value
R3.85
Insulation Type
Foam Board Insulation
Interior/Exterior
Interior/Exterior
Number of Pieces
1
Product Weight (lb.)
2.7
Sheathing Size
8 ft. x 1 in. x 48 in.
Sheathing Type
EPS

Warranty / Certifications

Warranty Information
N/A

Questions & Answers

233Questions23Answers

Can I install this on top of a plywood shed floor and then cover it with another layer of plywood...

Asked by BSanders June 22, 2021
0
Answers

I have a 27 x 12 metal carport which I intend to mount these panels on the top exterior of the ro...

Asked by FixitMan June 15, 2021
3
Answers

Manufactures website has installation details for R-Tech sheathing. The website address can be found in the installation manual in the Info & Guides section.

Is foil side be paintable

Asked by Ram June 13, 2021
3
Answers

Either side can be painted. Use latex paint only

I have a metal awning 27x12. How many pieces do I need? How do I secure to the top of the awning?...

Asked by FixitMan June 11, 2021
2
Answers

Dear FixItMan: It sounds like the metal roof of your awning is being heated by the sun, and radiating heat (iinfrared) inside your car port. Blocking this infrared energy will help, but obviously will not insulate the carpor from hot air outside. The easiest and cheapest way to block this infrared heat is (1) add reflective paint on the top of the car port, e.g. bright white or silver and (2) a reflective / radiant barrier inside -- not foam board. There needs to be a 3/4" air gap between the reflective barrier and the metal roof deck; you cannot simply glue the barrier to the roof deck. There will also need to be a vent / gap along the lower edge, to allow superheated air to escape. Reflectix is a good option; Home Depot carries it. First install 3/4" thick spacers of wood (e.g. 2" x 1" trim) on the roof deck with construction adhesive; hold them in place with tape until the glue sets. Then staple Reflectix to the wood spacers. Seal all of the joints and perimeter (except the gap along the bottom edge) with foil HVAC tape. (NOT silver fabric 'duck' tape.) Home Depot carries all of the products noted above. I hope this is helpful. Mark

Could this be covered with fabric and used for a bulletin board?

Asked by Bells June 8, 2021
4
Answers

Dear Bells: Yes, but use Foamular 250 foam board which is much denser. Home Depot carries it. Also be aware that foam board is flammable and emits tioxic gas when it burns -- so don't install it near any source of heat. I hope this is helpful. Mark

Can this be painted?

Asked by ELB May 31, 2021
2
Answers

Yes use latex paints , paint with solvents should not be used

can I use this around a new bath tub to retain heat before instalation?

Asked by Patrick May 16, 2021
3
Answers

Dear Patrick: That is an excellent idea. Use Foamular XPS foam board instead. It provides R-5 per inch of thickness and does not absorb water. XPS foam board is also stiffer and you can place a sheet under the tub if there is room. To complete your insulation project, you should also stuff the empty space with rock wool -- which provides R-4.1 per inch and does not absorb water. Rock wool fibers are irritating, like fiberglass, so wear gloves when you install it along with a good dust mask. The rock wool addition will make a significant difference. I hope this is helpful. Mark

How do I install these in my bathroom wall?

Asked by Cosmo May 2, 2021
2
Answers

Dear Cosmo: Thanks for the photo -- which helps to explain your question! First, you should onlly insulate bathroom walls that face the exterior. Do not insulate walls that adjoin another room. Second, the best solution is to fill the stud bays (the gaps between the wood studs) with rock wool batts. Rock wool provides R-4.1 per inch of thickness, and will be 3" thick for R-12.3. Home Depot carries Owens Corning rock wool. If you live in an area with cold winters, add 1" of polyisocyanate foam board, screwed to the wood studs (over the rock wool), which will add R-6.5, help you air-seal the wall, and will break all of the 'thermal bridges' created by the (previously) exposed wood framing. Seal all of the joints in the foam board panels to block air leaks. DAP 230 or HVAC mastic work well for joints and small gaps. Use the 'Window and Door' version of Great Stuff spray foam for the perimeter and larger gaps. Home Depot carries all of the products noted above. Talk to the Customer Service desk if you need help finding anything. I hope this is helpful. Mark

can this be installed with faced insulation in between the attic rafters?

Asked by TD April 29, 2021
2
Answers

First this board can be mounted either side facing the sun heat etc being just as effective. I have mounted this in aircraft hangers with metal roofing. Under the roofing we used paper sealed fiberglass insulation then covered with this product except 2 inch. all the seams taped with hvac tape , we've never has an issue with moisture inside the air gap. We are in Northern Ca winters as low as the 30s summers as high as 115. The buildings are 50 by 50 cement floors open space . If you think you will have an issue put some air gap vents . Of course see if your arrangements meet you local codes.

Once i have my weather barrier up (tyvek), what is the best way to attach this? 2" or 2/1/2" 6 d ...

Asked by jr April 28, 2021
2
Answers

I would use the longer. We usually use a fender washers with screws .

1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing - page 2

Customer Reviews

  • 4.7
    out of 275 reviews
  • 97% recommend this product
Filter by:
Showing 1-10 of 275 reviews
Styrofoam was great. I used it to make an art project for my grandson's birthday. It was easy to ...
Styrofoam was great. I used it to make an art project for my grandson's birthday. It was easy to cut, I used wood burning tool to shape headstones. it absorbed paint easily and didn't soak it in. I was very happy with the purchase, the price and the service at the store. So many photos it was hard to choose.
by mistwit
6 people found this helpful
Just foam board. Literally you can see light through the...
Just foam board. Literally you can see light through the insulation, but that’s what you get for the price. If you are wanting a small addition to insulative value and want to save money, these will work for you. I put 1x3 beams over these, anchored to the wall and they held up to the pressure of the board.
by HomeDepotCustomer
5 people found this helpful
I bought four 1"x4'x8' sheets to insulate my South Florida double-car garage door. Each sheet to...
I bought four 1"x4'x8' sheets to insulate my South Florida double-car garage door. Each sheet took me about 3 hours to measure, cut and install (8 "panels" per sheet). I'm 74 and accomplished the project on my own. Easy to cut and install.
by GmaOoh
7 people found this helpful
Good product.
Good product.
by None
1 person found this helpful
I bought this insulation board to make a cover for...
I bought this insulation board to make a cover for my desert garden. It includes a small bird bath. It's been in the 20's. Everything outside is frozen yet when I remove the cover from my desert garden even the half in deep bird bath remains unfrozen. I highly recommend for any temperature control
by Cover
1 person found this helpful
I thought to make a garage door a long time, very hot, sunny side. I was searching online what to...
I thought to make a garage door a long time, very hot, sunny side. I was searching online what to get better. They sell at least $ 76 on 8 panels, I have 16 panels. I bought R-Tech 1 in. x 4 ft. x 8 ft 4 panels for only $ 70 (used 3.5 panels). It turned out well, it became quieter in the garage, the gates are not rattling, I think the temperature has become lower.
by Alex
3 people found this helpful
Easy to work with...
Easy to work with...
by Milo
1 person found this helpful
was able to put in my garage door.
was able to put in my garage door.
by bg
Great insulating board. Foil side provides nice appearing surface. Used for insulating lower half...
Great insulating board. Foil side provides nice appearing surface. Used for insulating lower half of old single pane windows. Storm windows and screen blend with the foil side and drapes hide the R-Tech side. Stops drafty chill. Sheathing is easy to cut. Much stronger than foam panels. Easy to cut with disposable razor knives. After cutting to size the R-Tech covering can be peeled off for a clean white face. A very economical way to insulate old windows. Can be removed to let sun shine in.
by HomeDepotAddict
12 people found this helpful
I've purchased this product in the past, to use for insulating windows during the summer in Arizo...
I've purchased this product in the past, to use for insulating windows during the summer in Arizona and it worked well, but this purchase was for insulating a very thin door on my rental home. I moved into a 55+ mobile home community a year ago and the back door of the home is wafer thin. All last summer I could feel the heat coming through as if there were no door at all. I don't use the back door but maybe once in a blue moon, so I cut a sheet of R-Tech to size (use a very sharp blade to avoid foam fuzzies), finished the edges with duct tape and squeezed it into place (I used a butter knife like a shoehorn). Summer hasn't fully hit yet, but this door faces west and we're into the low 90's now and I feel absolutely zero heat coming through! I know this addition will help me save on my electric bill as the thermostat is only about 10 feet down the hall from this door and my SRP bills were huge last summer. I already had 2 layers of blackout curtains on this door, so the outside set of drapes cover it nicely now. Oh and I cut out a little niche for the doorknob & deadbolt. I've covered this with shelf paper in the past to conceal the text on the insulation and it worked like a charm.
by FemmeDraven
10 people found this helpful
Showing 1-10 of 275 reviews