Model # 613010

Internet #100573703

Store SKU #416989

Thermasheath Rmax Thermasheath-3 2 in. x 4 ft. x 8 ft. R-13.1 Polyisocyanurate Rigid Foam Insulation Board


Rmax Thermasheath-3 2 in. x 4 ft. x 8 ft. R-13.1 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
$3047 /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 R13.1 with dimensions of 2 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
  • How much do you need? Let our calculator help:
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Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

What type of adhesive caulk or glue is compatible with the product?

What type of adhesive caulk can be used to adhere to sheathing to wood studs? (of course nails would be used too, but this is just for initial stick and hold to provide time while installing to nail it fast). What type of adhesive caulk can be used to adhere sheets to another sheet to double up a layer for extra R-value? I have been told that some types of adhesive caulks will dissolve the foam and others are "safe" to use on the foam. Thank you!
Asked by: DanFrontier
I used PL300 by Loctite which is specifically made for foam board. Other petroleum-based adhesives may damage foam board, although with foil backing this might not be a problem, but beware.
Answered by: bustedpinky
Date published: 2017-03-25

Which side out?

Asked by: Dick
The foil needs to face an airspace to work as a radiant barrier, otherwise it won't work as one.
Answered by: GFactor
Date published: 2017-05-15

Can the foil be easily (somewhat) peeled off? Thanks!

Can the foil be easily (somewhat) peeled off? Thanks!
Asked by: SpadCat
Somewhat. No problem peeling off from smaller scraps, but might be a problem peeling it off a whole sheet without repeatedly tearing it off in pieces.
Answered by: bustedpinky
Date published: 2016-12-29

Can polyester fiberglaSs resin be applied to it

Asked by: wayne
YES. Polyisocyanurate foam will not melt from Polyester fiberglassing resin. Ideally, a urethane foam is what you want, but it is not carried anymore. However, Polyisocyanurate Foam will work just fine in its place. SIDE NOTE: Polyester fiberglassing resin will dissolve polystyrene foam (Styrofoam) on contact.
Answered by: GFactor
Date published: 2017-05-15
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Customer Reviews

Rmax Thermasheath-3 2 in. x 4 ft. x 8 ft. R-13.1 Polyisocyanurate Rigid Foam Insulation Board is rated 4.6 out of 5 by 9.
Rated 4 out of 5 by from I can only speak of the constructibility of the product, not its performance since it's my first ... I can only speak of the constructibility of the product, not its performance since it's my first use of it, but it seems to be working great for my basement finishing project. My basement is CIP concrete, 2400 SF, with 9' walls, TJI ceiling joists and wafer board engineered rim joist. I'm hoping this product will provide a vapor barrier while partially insulating the basement walls, mud sill and rim joist. I will be building 2 x 4 wall framing with a 1" air gap between framing and the foam board, and then installing kraft faced FG insulation in the stud cavities for a total R value of 26-ish, which is probably overkill. I couldn't find any fasteners specifically for securing foam board, so I used 2 @ 1/4" x 1-1/4" washers, 3-1/8" No. 10 screws with cheap 1/4" x 1-1/2" plastic anchors along the panel centerline and foam board glue to secure panels to the basement walls. A 1/4" carbide masonry bit with a 12 volt rechargeable drill for the anchor holes worked ok, but a hammer drill would have been better. Applied thin bead of glue 6" in from panel perimeter, around screw holes and down panel centerline, which got me about 2-1/2 panels per each 10 oz tube of glue. Panels are bowed due to shipping/storage, so I installed them concave side against the basement walls so panels are drawn in toward walls when screws were tightened, making better glue contact. Make sure to chisel off concrete burrs from walls before installing panels so uniform contact can be made, as well as addressing any water leaks. Installed panels vertically with 3/4" gap above floor, leaving about 9" of exposed concrete at top of the wall which I filled in to the bottom flanges of the TJIs with 9" strips cut with a rip hand saw, which worked fine. Any thin-bladed saw should work. Serrated steak knife or fillet knife works great for intricate cuts (just don't tell your wife). I sprayed a bead of great stuff on butt joints before installing the 9" strip. I made a template for the rim joist cavities, cut them out of the foam board, and glued them into the rim joist cavities with a 1/4" perimeter gap, which I then spray foam sealed with great stuff gap filler. I used the spray foam around wiring and plumbing penetrations, and filled the 1/2" floor gap to lock everything in. I ran out of foam board, so I cut up remaining scraps and covered the mud sill with them. Ideally I should have bought the bulk spray foam kits to seal the mud sill, but that stuff is spendy. Warnings: the foil backing is very fragile and the saw dust goes everywhere and will make you cough and gag, so wear a dust mask if you can stand them (I can't).
Date published: 2016-12-13
Rated 5 out of 5 by from R13 in only 2 in. I purchased this rigid insulation to insulate a cinder block basement wall. The sheets were easy to cut and I achieved R13 in only 2 in. of space as compared to extruded polystyrene, which is only R10, and for the same money. My only disappointment was that I planned to use construction adhesive to install for the short term, but this stuff had a slight bow from the store shelf and the polyiso it is too rigid for the adhesive to adhesive to flatten it out, so I ended up using furring strips and 1/4" x 3-3/4" flathead Tapcons to anchor to the block rather than adhesive, which was my long term plan anyway. Not the products fault, but thought you should know how it behaves. Also, tape the seams with the nashua foil tape and fill any large gaps with great stuff (same polyiso product).
Date published: 2015-01-05
Rated 4 out of 5 by from Good material. Installs easy 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 $35!!!!! + TAX A PIECE FOR THIS STUFF!
Date published: 2015-01-27
Rated 5 out of 5 by from Best Price Best Quality Best Value I take my hat off for Home Depot. I have searched everywhere for affordable RMAX. Home Depot is the only place that even comes close to providing prices that are reasonable. I don't cut corners on quality but don't want to have to take out a bank loan when having to pay for needed supplies. Home Depot has served us well in this regard. I will be back again and again. Thank you.
Date published: 2016-08-10
Rated 5 out of 5 by from Good product I insulated a laundry room with the R13 foam board and the job came out great. The cold room is now warm. Much easier than framing and sheetrocking. It is still hard work to move all of the electrical and plumbing, but was made easier using Sharkbite couplings. Not so bad. Homeowners were very pleased with the end result. Material is strong enough to adhere strips of wood for shelving. Tape seems with clear tape. Adhere to wall with large construction adhesive. Much more cost effective over spray on foam. Use hand saw to cut material. Cut outside as there will be thousands of foam particles that will fall off. I will use again. Material is waterproof and is reflective on both sides. A plus.
Date published: 2014-12-25
Rated 4 out of 5 by from great material very rigid product, easy to cut with a jigsaw. Used between existing joists and easy to press-fit when cut properly, no fasteners required. Cooled room by at least seven degrees over the batt insulation it replaced. Foil took a chalk line well. Easier clean up than coarser foam board, less static. It was pricey, but the thickness saved me a lot of install time.
Date published: 2015-06-16
Rated 5 out of 5 by from I'm pleased with the product for sure. I used it in my basement on walls that aren't buried. I bu... I'm pleased with the product for sure. I used it in my basement on walls that aren't buried. I burn wood for heat so good insulation is a must. I'm burning less wood and my house is warmer with no more help from the propane furnace which means I save mega money. I used to hear that thing kick on at night and could practically see the next propane fill bill, no more. Next winter I plan on insulating even the buried walls to save even more wood. I painted the cinder block walls with a primer/water sealant but I did it primarily because I used only liquid nails to put it up and it seems like a painted surface has more grip to it than crumbly cinder block. There is a debate whether or not you need the primer or some other water sealant, have fun reading about that argument, but I am lucky to have no water problems just cinder blocks that never warm up.
Date published: 2016-12-13
Rated 5 out of 5 by from Better then Great stuff Amazing product this is the standard for high performance insulation. Very easy to work with for my first time,score and snap like drywall or use very large dewalt razor knife and straightedge to cut all the way thru. I taped seams using 3m 8088 or Siga wigluv and fastened with 3.5'' deck screws and Rodenhouse Plasti-Grip ci Prong Washer. It should be available at every HD but its not. Closest in stock HD to me was 1200 miles away so I drove and got a full penske truck load. 1 pallet special order minimum at my New Orleans HD and $13more per sheet not cool! But its the best price thru HD for polyiso anywhere.
Date published: 2015-12-31
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