Model # 787264

Internet #100549260

Store SKU #787264

Thermasheath Rmax Thermasheath-3 1 in. x 4 ft. x 8 ft. R-6 Polyisocyanurate Rigid Foam Insulation Board


Rmax Thermasheath-3 1 in. x 4 ft. x 8 ft. R-6 Polyisocyanurate Rigid Foam Insulation Board

  • Polyiso foam bonded to reinforced aluminum foil facers
  • Cost effective way to increase a thermal efficiency and R-values
  • ENERGY STAR approved
$19.47 /each

Frequently Bought Together

Product Overview

R-Matte Plus-3/Thermasheath-3 is rigid foam plastic thermal insulation board composed of environmentally sound, closed cell, polyisocyanurate foam bonded to a durable white-matte (non-glare) aluminum facer and a reflective reinforced aluminum facer. This product is suitable for use in wall sheathing applications in new residential, commercial and agricultural buildings and for thermal retrofit construction to existing buildings. This ENERGY STAR qualified R-Matte Plus-3/Thermasheath-3 provides R6 with dimensions of 1 in. x 4 ft. x 8 ft. This product is designed for exterior and interior, non-structural uses.

  • Rmax polyiso sheathing offers the GREATEST R-value per inch currently available in a rigid foam board
  • R-Matte plus-3/Thermasheath-3 is applied to the exterior or interior face of wood or metal studs to cover all studs, sills, plates and header constructions, thereby providing insulation over areas not normally covered by insulation products
  • Superior resistance to moisture and vapor in above grade applications
  • Polyiso rigid foam board offers superior fire protection properties compared to any other rigid foam board insulation
  • ENERGY STAR qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings
  • When taped and flashed, the Rmax polyiso board greatly reduces air infiltration and prevents thermal bridging caused by heat and cold transmission through studs
  • Lightweight and easily cut to size
  • Note: Product may vary by store
  • How much do you need? Let our calculator help:
    Insulation calculator button

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

Can this product be used for HVAC Ducting?

Asked by: Tom
I looked at the details on this product and it requires a thermal barrier (typically 1/2" gypsum) when it is exposed. I'm looking at insulating my ducts with DOW's Thermax product which does not require a thermal barrier.
Answered by: Fagmosis
Date published: 2016-12-20

Can this be used to insulate a Garage door?

The question kind of says it all!
Asked by: Sherv
I Did! Just ask at the Paint Dept which Liquid Nails Product to use to glue it to either a Wood , Metal or Vynil door.. I also use temp Braces to hold the panels up in place for a Hour..till the Gluing set.. its been 3 yrs and So Far So Good. my Luqid Nails prduct was for the Foam to a Metal GD.. was the LN- HD for foam adhesive for all surfaces, cost $7 a tube.. but only needed 1 tube of 2" round spots of Glue every couple of Feet .. Liquid Nails Model # LN-2000 Internet # 206736831 Store SKU # 1001679080 Liquid Nails Fuze It 9 oz. All Surface Construction Adhesive You might want to Opt for using a Liquid Can of Glue and a Paint Roller (or Use a Paint brush) for more complete gluing coverage.. I'd ask in the Paint Dept which is best to use for your application..
Answered by: Retired
Date published: 2016-07-26

What is the best way to cut Thermasheath board?

Asked by: Bob
Stanley Sharptooth Fine Finish mini-utility saw cuts it like butter.
Answered by: Scotty
Date published: 2016-09-29

can it be glued to metal roofs and walls

Asked by: weld1958
Dear Weld: Yes, as the other answer noted. Please be aware, however, that foam board (and spray foam) is very flammable and emits toxic gasses when it burns. it MUST be covered by an approved 'thermal barrier' in any garage, outbuilding, storage building, living space etc. The standard is 1/2" drywall. If your local building inspector approves, however, intumescent paint may be an option. It must be applied in a thick layer, but may be easier than drywall for your metal building. See: ForceField Model FFGD E84-g05, Home Depot Internet #203582028 I hope this is helpful, Mark
Answered by: BvilleBound
Date published: 2017-01-27
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Customer Reviews

Rmax Thermasheath-3 1 in. x 4 ft. x 8 ft. R-6 Polyisocyanurate Rigid Foam Insulation Board is rated 4.7 out of 5 by 3.
Rated 5 out of 5 by from Great product Our garage door faces East, During the summer our garage gets super hot and stays hot all the time. I was on a mission and decided to start with insulating the door. I did some research and stumbled across the RMAX ThermaSheath, I marched to HD and purchased 4 x 4x8 sheets, setup a work table and started ripping these sheet into 2x4 panels. I ended up wasting most of the first sheet as I broke some trying to bend it to fit in the garage door panel, ( These boards are rigid and do not bend easy ), so I decided to use a different approach, I cut each of the 2x4 panel into 3 sections, inserted the left, then right and finally the middle section, I finished it by taping the sections wth metal duct tape and viola ... Today, the outdoor temperature is a sunny 75 F, a few of the un-insulated panels are at 114 F according to my FLIR TG-165, ( See image ) makes me wonder why did I wait so long to do this. Totally worth the price and definately cheaper than the pre-cut solutions offered by various other retailers.
Date published: 2016-09-19
Rated 4 out of 5 by from Good product, easy to install. Installs quite easy. Use extra fine tooth wood saw to cut to size. When picking up material from store INSPECT IT for damage to the corners and sides! The do not pay much attention to the fact that this board is quire fragile and it gets damaged easy if mishandled. REMEMBER YOU PAY $20 + TAX A PIECE FOR THIS STUFF!
Date published: 2015-01-27
Rated 5 out of 5 by from Very light weight and insulates great I used this to insulate my attic access. As soon as you open the door on a cold day you can really tell it's working great. It's super light weight makes it seem like it's not even there when I'm opening the door. I used regular liquid nails to put it up and it's staying very well
Date published: 2014-12-10
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