0732813100065

R-Tech

Model # 310873

Internet # 202530470

Store SKU # 483214

3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing

$12.48 /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 is a cost effective way to increase your project energy efficiency. EPS is a fully recyclable material. R-Tech is also available in thicknesses ranging in 1/8 in. increments from 3/8 in. to 5 in.

  • Specifically developed for wall sheathing, siding underlayment and basement and foundation insulation
  • 8 ft. length can be easily cuts to desired size
  • Energy Star qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings
  • Moisture resistant with great insulating properties
  • Poly-facer on both sides for durability and flexibility
  • 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.) 
48 
Product Height (in.) 
96 
Product Length (ft.) 
8 ft 
Product Thickness (in.) 
.75 in 
Product Width (in.) 
48 

Details

Faced or Unfaced 
Faced 
Insulation Application Type 
2x6 Walls,Attics,Basements,Crawlspaces,Exterior Sheathing,Exterior Wall Foundation,Garage,Under Slab,2x4 Walls 
Insulation R-Value 
2.89 
Insulation Type 
Sheathing 
Interior/Exterior 
Interior/Exterior 
Product Weight (lb.) 
2 lb 
Sheathing Type 
EPS 
Structural 
No 

Warranty / Certifications

ENERGY STAR Certified 
Yes 
Warranty Information 
N/A 

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Customer Questions & Answers

59 Questions91 Answers

Customer Questions & Answers

3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing
3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing

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4 answers

What side should the reflective side face, towards outside or inside?

This question is from 3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing
Asked by
SLC
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March 26, 2016
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Answers (4)

Asked by
pittsburgh, PA
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Home Improvement Profile: DIYer
June 19, 2016
Answer: 
It depends on whether the application is from the inside or the outside. If you're applying it as outside sheathing to be covered than the mylar faces inside if you are applying against basement block walls than the mylar faces away from the interior.
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Asked by
Massachusetts
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Home Improvement Profile: Professional
April 28, 2016
Answer: 
Dear JM: The foil side should face toward the source of radiant heat -- e.g. a hot metal roof. A few key points:
> Reflective surfaces are only effective in summer, e.g. to reflect radiant energy from a hot roof. Cold cannot be 'reflected' and warm air in your home is not radiant. So unless you are trying to insulate a hot roof, the reflective surface will make little difference. In most applications, Read More
Dear JM: The foil side should face toward the source of radiant heat -- e.g. a hot metal roof. A few key points:
> Reflective surfaces are only effective in summer, e.g. to reflect radiant energy from a hot roof. Cold cannot be 'reflected' and warm air in your home is not radiant. So unless you are trying to insulate a hot roof, the reflective surface will make little difference. In most applications, almost all of the insulation R value is provided by the thickness of the foam.
> You must also create / build a sealed air pocket on the reflective side, e.g. a ~1/2" gap under the roof. Seal all of the edges and seams carefully to block air leaks. Great Stuff foam works well.
I hope this is helpful.
Mark Read Less
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Asked by
Ravenna, Ohio.
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Home Improvement Profile: DIYer
April 10, 2016
Answer: 
I doubt it matters much. However, I would recommend that used on the interior it should face toward the inside. If used on the exterior it should face the outside.
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March 27, 2016
Answer: 
The reflective coating faces outward.
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4 answers

can i glue this product

This question is from 3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing
Asked by
ny
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January 6, 2016
want to add some insulation on inside of garage door can i glue these panelsto it
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Answers (4)

Asked by
Ravenna, Ohio
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Home Improvement Profile: DIYer
April 8, 2016
Answer: 
We used liquid nails to sucure it to painted block basement wall. It was held in place to dry and still fell off after dry. The liquid nails adhesive pulled right off the foil side.
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Asked by
Minnesota
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Home Improvement Profile: Professional
March 4, 2016
Answer: 
The R-TECH insulation may be fully adhered using a typical urethane (tube) adhesive that is compatible with Expanded Polystyrene. Insulfoam has a technical bulletin pertaining to suitable adhesives and sealants.
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Asked by
pittsburgh, PA
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January 11, 2016
Answer: 
yes, You can use liquid nails heavy duty construction adhesive on either side of the panels. no damage to the skin on either side of the insulation. There are adhesives that are designed for polyethylene products if you are planning on gluing the non coated sides however. But for larger panel applications that would be minimal.
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Asked by
pittsburgh, PA
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January 11, 2016
Answer: 
yes, You can use liquid nails heavy duty. Both sides of the product are covered in a plastic sheathing. Although Liquid nails heavy duty construction adhesive says not to use on plastic, it' has been tried and works well when I did this. DOES NOT deform the board.
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3 answers

fire rating question; can i leave it exposed in basement per typical residentail code?

This question is from 3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing
Asked by
portland maine
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May 27, 2016
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Asked by
pittsburgh, PA
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June 19, 2016
Answer: 
This product is not fire rated nor can it be used exposed to any kind of Open Flame Source it would not pass code for a basement insulation without drywall over top of it
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Asked by
Massachusetts
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Home Improvement Profile: Professional
June 11, 2016
Answer: 
Dear Enzo1820: As the R-Tech rep noted, foam board MUST be covered by an approved "thermal barrier" in any occupied room, basement, garage, storage area, etc. -- because foam board is very flammable and emits very toxic gas when it burns. The standard "thermal barrier" is 1/2" drywall. Exposed foam board would be a major fire hazard and code violation.

If you are upgrading your basement, also read up
Read More
Dear Enzo1820: As the R-Tech rep noted, foam board MUST be covered by an approved "thermal barrier" in any occupied room, basement, garage, storage area, etc. -- because foam board is very flammable and emits very toxic gas when it burns. The standard "thermal barrier" is 1/2" drywall. Exposed foam board would be a major fire hazard and code violation.

If you are upgrading your basement, also read up on fire blocking, which is also required by code. Fire blocking must be installed along the top of basement walls, every ten feet along the wall, around any penetrations for pipes or electric lines, etc. Do a Web search for "How to Firestop Your Basement" by Contractor Kurt -- a great resource. Home Depot sells all of the products you will need to install firestopping.

I hope this is helpful.

Mark
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May 31, 2016
Answer: 
No. This is not an approved application. The R-Tech should not be left exposed in a basement application per most residential codes.
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3 answers

the manufacturer recommends " minimum 6d ring-shank nails and 15⁄16" diameter plastic washers ". Can you identify those washers ?

This question is from 3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing
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May 25, 2016
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Asked by
pittsburgh, PA
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June 19, 2016
Answer: 
Those are the same washers used for hammering down roof sheathing or securing underlayment such as housewrap etcetera
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Asked by
Massachusetts
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June 11, 2016
Answer: 
Dear Bobbo: Do a search for "round cap roofing nail" on the Home Depot website.

It would be smart to add a much thicker layer of foam board, however, to increase the R value. We always use a minimum of 2". XPS and polyiso foam board also provide a higher R value per inch. Both are stocked and sold by Home Depot, e.g. Owens Corning Model # 52DD, Home Depot Internet # 202085962 Store SKU # 307101. We
Read More
Dear Bobbo: Do a search for "round cap roofing nail" on the Home Depot website.

It would be smart to add a much thicker layer of foam board, however, to increase the R value. We always use a minimum of 2". XPS and polyiso foam board also provide a higher R value per inch. Both are stocked and sold by Home Depot, e.g. Owens Corning Model # 52DD, Home Depot Internet # 202085962 Store SKU # 307101. We prefer XPS over polyiso for roof and exterior applications because it does not absorb water. Polyiso does.

Also note that all foam board products are very flammable. This is important during installation when the foam board is exposed. If foam board is installed inside any home, basement, garage, storage area, etc. it must be covered by a thermal barrier. The standard is 1/2" drywall.

I hope this is helpful.

Mark
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May 31, 2016
Answer: 
These are roof cap fasteners and should be sold at THD
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Customer Reviews

Rated 4.0 out of 5 by 8 reviewers.
Rated 4.0 out of 5.0 by Used between furring strips I didn't use this over sheathing but in my 1950s furring strip on cinder block home. With the furring strips, there is not much room for insulation but when I re-modeled the bathroom, this 3/4" thick insulation fit great in between the cinderblock, furring strips and drywall. It doesn't have much R value but anything helps in my cold house. Ive noticed a slight different in insulation. I used a utility knife to cut up. The foam is messy despite how sharp your blade is. May 24, 2016
Rated 5.0 out of 5.0 by The versatility of this product met my needs amazingly well. It was large, it was ridgid, it was light, it was affordable, it was paintable--it was just what I needed for making two backdrop stages for a vacation Bible school. Admittingly it was an aberrant use of foam insulation, but the kids loved it! I peeled off the foil, laid 5 piecies on the ground, drew and painted the scene, then turned them over and connected them with duck tape. Then stood them up. July 24, 2013
Rated 5.0 out of 5.0 by Great for blocking knitted items I needed a surface to block knitted items. This board works great. Accepts pins well. Lightweight and rigid, stores vertically. November 15, 2013
Rated 3.0 out of 5.0 by Good if you dont need to cut it The first sheets went in well then I had to cut some to fit, after the 1st cut there were little white balls of foam everywhere. OK so lets change to a sharper knife, no difference, This is great if its the right size but be prepared for clean up when you cut !!! August 2, 2015
Rated 3.0 out of 5.0 by R value In answer to the other reviewer's question...zoon into the product and you'll see the R-value on the panel. Depending on temperature, it's around 3.8 per inch of thickness. That makes this around 2.85R-value. not great but cheap October 17, 2012
Rated 5.0 out of 5.0 by Great product with great customer service This store is simply outstanding! They helped me cut this piece of foam, carried it out to my car and made sure I had all I needed. June 13, 2013
Rated 5.0 out of 5.0 by easy to use great product and price easy to use great product and price used to build hot tank for customer January 22, 2013
Rated 2.0 out of 5.0 by R value there is no where on the pruduct that gives it's R value. this is the most asked question. October 13, 2012
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