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Internet #202863791

Model #DBWEF48100

Store SO SKU #441714

48 in. x 100 ft. Concrete Slab Insulation

  • Suitable for use between concrete slabs in radiant floors
  • Foil inside spreads out heat signature of heating coils
  • Designed for swift and simplified installation
  • See More Details

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Product Overview

The Reflectix concrete slab insulation is an innovative, easy-to-handle product that increases the energy efficiency of radiant floor and snow melt systems (under concrete). The foil, within the product, acts to spread out the heat signature of the heating coils. This results in a more comfortable floor due to a more even floor or slab surface temperature.
  • Reflectix 48 in. wide concrete slab insulation is a fiber-free product that is easy-to-handle, install and transport
  • Insulation is a coated foil with a white poly surface and provides an R-1.0
  • Please note: this product arrives in a package 20 in. H x 20 in. W x 48 in. L, please insure your vehicle can accommodate this dimension
  • Applications include snow melt systems, radiant floor over an existing floor and a radiant floor in a slab
  • Reduces or eliminates ground water intrusion into the slab
  • Manufactured at a ISO 9001:2015 facility
  • Promotes a more even heat distribution on the floor surface
  • No nesting characteristics for insects
  • With taped seams, the product is a vapor and radon retarder
  • Safe-to-handle and install, non-toxic and non-carcinogenic
  • The foil is protected from lime in curing concrete
  • White poly side of the insulation shields the foil from high alkaline content in the soil
  • Does not promote the growth of fungi, mold or mildew
  • Not affected by moisture or humidity
  • Durable and lightweight
  • How much do you need? Let our calculator help:
    Insulation calculator button

Info & Guides

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Price
Ratings
(73)
(9)
(15)
(38)
Insulation Accessory TypeVapor Barrier InsulationVapor Barrier InsulationVapor Barrier InsulationVapor Barrier Insulation
Insulation FeaturesVapor RetardantFormaldehyde Free,Mold Resistant,No-Dust Material,Vapor RetardantVapor RetardantMoisture Retardant
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Specifications

Dimensions

Product Depth (in.)
1200
Product Height (in.)
0.3125
Product Width (in.)
48

Details

Insulation Accessory Type
Vapor Barrier Insulation
Insulation Features
Formaldehyde Free,Mold Resistant,No-Dust Material,Vapor Retardant
Insulation Type
Accessory
Number of Pieces
1
Returnable
90-Day

Warranty / Certifications

Warranty Information
Reflectix warrants its products to be free from material and workmanship defects.

Questions & Answers

11Questions21Answers

What would you recommend to put over concrete floor as a vapor barrier

Asked by ed April 17, 2020
0
Answers

I wanna install tiles in my garage floor , can i use this over the concrete floor and then sub floor over it

Asked by Ed April 16, 2020
2
Answers

Dear Ed: This product will provide almost no benefit. The R-value of Reflectix is just R-1 under or over concrete. In short, a waste of money and time. Home Depot offers the right solution, however: Foamular 250 foam board, which provides 25 PSI of 'compressive strength' -- ideal under and over residential concrete slabs. More to the point -- why do you want to insulate your garage floor? Garages are notoriously poorly insulated, with the big and poorly sealed garage door being Issue #1. If you want to insulate a bedroom above or adjacent, focus on the ceiling and those walls, not the garage floor. Open the walls and / or ceiling and fill the stud / joist bays with rock wool, then apply a 1" layer of polyiso foam board, and install new drywall. If you want to convert your garage into a livable room, then (a) replace the garage door with a well-insulated wall and (b) install 2" of Foamular 250, followed by 3/4" plywood as the subfloor for your new tile. Seal all of the seams in the foam board with HVAC mastic, install the plywood oriented 90 degrees from the foam board panels, and seal the plywood panels the same way. Home Depot carries all of the products noted above. I hope this is helpful, Mark

Would you put this on top of the foam board?

Asked by charlie June 24, 2019
2
Answers

Dear Charley: You have the right idea, just skip the Reflectix. First, a radiant barrier provides almost no insulation by itself -- just R-1. You need to build an air gap, which provides almost all of the claimed R-value. This obviously will not work under a concrete slab. Second, reflective barriers do not work in cold temperatures -- because cold cannot be 'reflected', and the relative warmth from the pex tubing is not radiant. (If you look closely at the Reflectix website, you will see that they claim only R-1 for this product.) A couple of recommendations for your floor: (1) The first layer should be a thick poly sheet as a moisture barrier. If you are also pouring foundation walls, make sure the exterior side of the walls are also sealed to block moisture. (2) Use at least 2" thick Foamular 250 XPS foam board as your second layer. The 250 version has extra 'compressive strength' for use under and over residential concrete slabs. XPS delivers R-5 per inch of thickness and does not absorb water. See: Owens Corning Foamular 250 Model # 52DD, Home Depot Internet #202085962, Store SKU #307101 Perimeter insulation is also essential, where the foam board "turns the corner" around the perimeter of the slab -- isolating the entire slab from ground contact. Do a Web search for "How to insulate a concrete foundation". FineHomebuilding and GreenBuildingAdvisor have good articles and diagrams. (3) Add your rebar -- which must be placed on support 'hats' to raise it to the correct position in the slab, and prevent the rebar from moving while the concrete is placed. See Hercules 1 1/2" rebar chair Model # 911, Home Depot Internet #204220120 Keep the rebar 2" from the edges of the slab. (4) Fasten the PEX tubing to the rebar in the lower position on the hats with zip ties. This will position the PEX roughly in the middle of the slab. (5) Mark where the PEX tubing is located on the walls, take a couple of photos and make a diagram. Contractors often need to drive Ramset nails into the slab to build interior walls etc, and your markings and diagram will help them avoid the PEX tubing. Ramset nails are notorious for puncturing hydronic heat pipes, leading to costly repairs. (6) Your PEX piping must be connected to manifold to distribute warm water evenly throughout the slab. You do not want one long PEX pipe with one inlet and outlet. Home Depot sells manifolds you can connect to hydronic PEX piping. You may also want to create zones for different rooms, linked to a pump and switch for each zone. Home Depot sells hydronic pumps and controls. I hope this is helpful. Mark

What kind of tape is recomended for the seams ? Can this prodict directly be layed onto the excavated soil bed before rhe concrete slab ?

Asked by NickGeorgeIris February 4, 2019
3
Answers

Dear Nick: If you placed Reflectix on the soil before your concrete slab was poured, you (unfortunately) wasted your money. Reflectix and similar products deliver just R-1. Home Depot carries the right solution, however: Foamular 250 foam board, which provides 25 PSI of 'compressive strength" and R-5 insulation per inch of thickness. You should install 2+ inches of Foamular 250 before the concrete slab is placed. The edges of the slab should also be insulated with Foamular 250. Read-up on line about "how to insulate a concrete slab". FineHomebuilding and GreenBuildingAdvisor have a number of articles that explain the best process. Foamular 250 should also be used on top of the concrete slab to further isolate it from your floor. Seal all of the joints and edges to block air leaks and moisture. HVAC mastic works well for joints and small gaps. Use the 'Window and Door' version of Great Stuff spray foam for larger gaps. Then install 3/4" plywood over the foam board as the nailbase / subfloor for your new flooring. Orient the plywood 90 degrees from the foam board, and seal the plywood the same way. Leave a 1/2" gap around the perimeter for expansion. I hope this detail is helpful, Mark

Does Home Depot offer installation for this product?

Asked by Joe August 8, 2018
1
Answer

Dear Joe: No -- and this product is nearly useless. Read the Reflectix info carefully, and you will find that it provides only R-1 insulation value. Reflective barriers require an air gap to perform, and this is obviously not possible under a concrete slab! In addition, they do not perform well in cold environments (e.g. under a concrete slab) because cold cannot be 'reflected' and the concrete slab is not radiant. Home Depot does sell the best solution, however: Foamular 250 foam board, which provides R-5 per inch of thickness and 25 PSI of compressive strength. This is ideal under residential concrete slabs. Use at least 2" thick sheets, and read up on the Web on how to insulate the corner of the slab / wall footing and the walls. See: Foamular 250 Model # 52DD, Home Depot Internet #202085962 Store SKU #307101 I hope this is helpful. Mark

Could this product be used in place of the under slab plastic vapor barrier?

Asked by Eric April 14, 2018
2
Answers

Dear Eric: First, this product provides almost no insulation under or over a concrete slab -- just R-1. So there is no reason to use it rather than a standard thick poly sheet. You have the right idea, however. Insulation and vapor reduction are excellent improvements. The best option for residential floors is Foamular 250 foam board, which provides R-5 per inch of thickness and 25 PSI of compressive strength -- which is ideal under or over a concrete slab. In addition Foamular does not absorb moisture, a key concern in a basement, and it provides R-5 per inch of thickness. So install 2" thick panels if you have enough ceiling height. See: Owens Corning Model # 24DD, Home Depot Internet # 100320335 Store SKU # 52802 Here are some additional tips -- including suggestions if this slab is in your basement: (1) If there is any possibility of a water leak into your basement, install DriCore panels first. They have a rubber surface on the bottom with channels that water can trickle through. Make sure, of course, that you have a drain with a dry well or sump pump for the water to escape to. Carefully seal all of the joints and edges of the DriCore panels with DAP 230 sealant to block air / moisture leaks. See: DriCore Model # CDGNUS750024024, Home Depot Internet #202268752 Store SKU #361018. We installed DriCore at a recent project as a fail-safe, even though the basement was dry. Water leaked in unexpectedly through a window during a downpour, and DriCore saved the new floor. (2) Seal and insulate the floor: Install 1" to 2" thick sheets of Foamular 250, and carefully seal the joints, edges and corners to block air leaks. See: Owens Corning Model # 24DD, Home Depot Internet # 100320335 Store SKU # 52802. Use DAP 230 between the joints and for small gaps. The 'Window and Door' version of Great Stuff spray foam is good for larger gaps. Then install sheets of 3/4" plywood on top of the foam board, running at a right angle to the foam board, as the subfloor for your new flooring. Leave a 1/2" gap around the edge of the plywood sheets next to the walls, to allow for expansion. Again, carefully seal all of the joints and edges of the plywood to block air / moisture leaks. (3) Also read up on fire blocking your basement, which many people overlook. This is required at the top of basement walls, along the walls, at the top of stairs, etc. Do a Google search for "How to Firestop Your Basement" from ContractorKurt. RockWool is a good solution. See RockWool Model # RXCB351525, Home Depot Internet #202090820 Store SKU #974419. You can stuff it into the gap at the top of the wall and into the end of floor joist bays. To seal holes created for pipes and wiring, use fire resistant caulk, e.g. 3M Model # CP-25WB+, Home Depot Internet #100166701 Store SKU #163096.. DO NOT use the "Fireblock" version of Great Stuff foam; believe it or not, all versions of Great Stuff ignite at just 240 degrees F, which is significantly lower than the ignition temp for wood studs. I hope this is helpful. Mark

What’s the r value?

Asked by Brian October 19, 2017
3
Answers

Dear Brian: Good question! Reflectix and similar reflective / radiant barrier products provide almost no insulation under or on top of a concrete slag -- just R-1 for Reflectix. So this is clearly an ineffective solution. The best option under a concrete slab is Foamular 250, which delivers R-5 per inch of thickness along with 25 PSI of compressive strength. In addition, Foamular does no absorb water -- a key concern for below grade installations. See: Foamular 250 Model # 52DD, Home Depot Internet #202085962 Store SKU #307101 I hope this is helpful, Mark

can this be used on (not under) a dry basement slab, with an electric radiant heat under a floati...

Asked by WoodBunny September 20, 2017
3
Answers

our product would be a great fi if it were installed under the concrete. We would add an R1.1 which isn't much but what Reflectix adds that other products don't add is a radiant quality. Our products reflect radiant heat back at a rate of 96% making your radiant floor more efficient. Installing our product on top of concrete and then installing a floor wouldn't work because our product is basically bubble wrap and over time it would break down from foot traffic.

is there an r value on this

Asked by les September 11, 2016
3
Answers

Dear Les: As Reflectix noted, the R value is minimal -- just R1.1!! This is also true for other applications of Reflectix; the shiny bubble wrap provides almost no insulation R-value by itself. The advertising claims are based on an "assembly" with a sealed air gap that you must create / build when you install it. This air gap actually provides almost all of the claimed R value. In addition, Reflectix and similar reflective / radiant barrier products are not effective in winter because cold cannot be 'reflected' and the warmer air inside your home is not radiant. Home Depot does sell the right solution for residential concrete slab insulation: Foamular 250 foam board. Foamular provides R-5 per inch of thickness, winter and summer. Foamular does not absorb water like other types of foam board, which makes it ideal for below grade and under-slab installations. Plus Foamular 250 provides 25 PSI of compressive strength, which is perfect for almost all residential applications. Versions are also available with higher compressive strength for commercial and high-load installations. If you have not yet poured your slab, read up on the best way to insulate the slab, footing and foundation walls. The foam board should 'wrap around' the end of the slab to isolate it from the footing and wall, for example. Diagrams are available online, e.g. from Fine Homebuilding. I hope this is helpful, Mark

over existing slab?

Asked by MECzech February 2, 2016
2
Answers

Dear MeCzech: If you have not completed this project yet, here are some recommendations: (1) If there are no moisture / water leakage problems with your concrete slab, start by installing 1" to 2" of Foamular 250 foam board on the slab. Foamular provides R-5 insulation per inch of thickness, does not absorb water and functions as a vapor retarder. Plus Foamular 250 offers 25 PSI of compressive strength, which is ideal for floors. Carefully seal all of the joints and edges to block air and water vapor leaks. DAP 230 sealant works well for small gaps. The 'Window and Door' version of Great Stuff spray foam is good for larger gaps. Then install 3/4" Plytanium plywood over the foam board to provide a solid surface for your new tile. Again, carefully seal all of the joints and edges to block air leaks. You should also install an "uncoupling membrane" under the tile -- to allow it to 'float' and avoid cracks. See: Ditra Model # DITRA5M, Home Depot Internet #100143471 Store SKU #702068 (Read the Ditra installation info.) (2) If you do have water leakage problems: Start by installing DriCore panels over the concrete slab. DriCore has a rubber layer on the bottom to block and channel water. (Make sure you have a drain for water to run to, of course.) We installed DriCore in a basement on a recent project, as a fail-safe. Sure enough, water leaked in unexpectedly through a window during a downpour -- and the DriCore panels saved the new flooring. Like the foam board, carefully seal all of the joints and edges when you install the DriCore panels, to block air and moisture. Then follow all of the steps noted above. See: DriCore Model # CDGNUS750024024, Home Depot Internet #202268752 Store SKU #361018 I hope this is still helpful, Mark

48 in. x 100 ft. Concrete Slab Insulation - page 2

Customer Reviews

  • 4.6
    out of 9 reviews
  • 100% recommend this product
Filter by:
Showing 1-9 of 9 reviews
Easy to work with and seems well made...
Easy to work with and seems well made
by MATT
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
This product is amazing, are used as a vapor...
This product is amazing, are used as a vapor barrier and insulation under concrete slab. And continued it up to walls to insulate concrete basement. Very easy to use very easy to cut. The basement was warmer instantly.
by HomeDepotCustomer
1 person found this helpful
This product was great. Thank you. All my radiant insulation...
This product was great. Thank you. All my radiant insulation will be coming from you in the future
by Bill
Easy to use, Definitely would use it again and tell...
Easy to use, Definitely would use it again and tell friends about it
by Ditson
Easy to work with and on ,1.1R minimal , Foil...
Easy to work with and on ,1.1R minimal , Foil not sure if it does anything under poured concrete. Tape worked great on seams , had to buy from another vender.
by Kurt
Product as described. Applied easily. Will not know how well it works until later.
Product as described. Applied easily. Will not know how well it works until later.
by BCA
Exactly as advertised
The insulation is a lot tougher than I expected it to be. It went down easy. Tough enough to walk on.
by Debbie
1 person found this helpful
Nice to work with
I used this insulation under a concrete slab. It was easy to lay out and tape. Only problem was getting the inspectors to accept it. They didn't have any experience with it so I had to gather specs and comparison information.
by Cheryl
1 person found this helpful
Showing 1-9 of 9 reviews