Model # DBWEF48100

Internet #202863791

Store SO SKU #441714

Reflectix 48 in. x 100 ft. Concrete Slab Insulation


48 in. x 100 ft. Concrete Slab Insulation

$13122 /roll
store icon Loading Buying Options...
package icon Loading Buying Options...
Sorry, but we ran into issues loading these options. Please try refreshing.

Frequently Bought Together

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 easy to handle, install and transport
  • Insulation is a coated foil with a white poly surface
  • With taped seams, the product is a vapor or radon retarder
  • Not affected by moisture or humidity
  • Reduces or eliminates ground water intrusion into the slab
  • Foil is protected from lime in curing concrete
  • No nesting characteristics for insects
  • Will not compress, collapse or disintegrate
  • Durable and lightweight
  • 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.



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Insulation Type
Radiant Barrier

Warranty / Certifications

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

More Products With These Features


Customer Questions & Answers

is there an r value on this

Asked by: les
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
Answered by: BvilleBound
Date published: 2017-02-07

over existing slab?

Is it possible to use Reflectix (when remodeling kitchen) over very old existing concrete slab? I want to install over all room new porcelain tile and just in part of that kitchen I want to install radiant heat foil under the tile. This concrete slab sits practically on the ground and definitely is not protected against moisture. If I could use Reflectix, how should I do it? Please? Thank you.
Asked by: MeCzech
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
Answered by: BvilleBound
Date published: 2017-02-16

radiant floor use

I am trying to estimate least expensive radiant floor installation I can afford. will this work for insulation on top of subgrade then wire then tubing for heating then slab?
Asked by: robert
Dear Robert: Reflectix has almost no insulation R value by itself. The R values claimed on the package are based on a sealed 'air gap' that you must create or build. Look for the Federal Trade Commission Fact Sheet on the Reflectix Inc. website for the details. In your application there obviously will not be an air gap, so the R value would be near zero. The best option would be Foamular XPS foam board from Home Depot, which provides R5 per inch. XPS does not absorb water, unlike polyiso foam board, so it is perfect for concrete slabs and radiant heating. Versions are also available with high compressive strength under large slabs; you can order them via the Home Depot Customer Service / Pro desk. I hope this is helpful. Mark
Answered by: BvilleBound
Date published: 2015-12-30
  • y_2017, m_7, d_25, h_14CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_3
  • loc_, sid_202863791, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=BEST_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=POSITIVE_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 35ms

Customer Reviews

48 in. x 100 ft. Concrete Slab Insulation is rated 4.0 out of 5 by 2.
Rated 4 out of 5 by from 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.
Date published: 2016-09-21
Rated 4 out of 5 by from Exactly as advertised The insulation is a lot tougher than I expected it to be. It went down easy. Tough enough to walk on.
Date published: 2016-10-05
  • y_2017, m_7, d_25, h_2
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_2
  • loc_, sid_202863791, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 29ms