Skip to product information
1 of 3

Under Concrete Slab for use in Radiant Floor and Under Concrete applications

Ultra CBF Under Slab Insulation - 4' X 75' (300 sq ft)

Ultra CBF Under Slab Insulation - 4' X 75' (300 sq ft)


SKU: EF1620-48-075

Provides thermal barrier under concrete slabs and radiant floors

Regular price $166.00
Regular price Sale price $166.00
Sale Sold out

Description:

EcoFoil Under Slab Insulation is a patented breakthrough product in the concrete slab insulation industry. It is specifically designed for use as a thermal barrier under concrete and works superbly with radiant heat system. EcoFoil Under Slab Insulation (1/4" to 5/16") thick, is manufactured with a single layer metalized reflective sheet laminated between two layers of strong polyethylene bubbles. EcoFoil Under Slab Insulation has a compression strength of 140 PSI. Our insulation is thin and lightweight, making it easy to conform to your grade and reduces any worry of leaving pockets or voids like traditional insulation.

Unlike traditional bubble insulation, where the foil is exposed, our patented product is encapsulated. This was done for two main reasons; the integrity of the foil and the airspace it creates for effectiveness. If the foil surface comes into direct contact with certain acidic soils it can corrode the reflective properties of the insulation. This can also happen during the curing process of concrete. For this reason, standard radiant barriers or bubble insulation are not an appropriate insulation for an underground application. It is also important to maintain an airspace on one side of the insulation in order for it to be reflective. By laminating the reflective metalized sheet in between two layers of our sturdy bubble insulation we have ensured the integrity of the foil by protecting it from corrosion and deterioration. We are also maintaining an air space by placing the foil in between the bubble layers.

Most importantly, EcoFoil Under Slab Insulation reflects 57% of radiant heat back up towards the surface, whereas without under concrete insulation, this heat would travel down and be lost in the soil. Additional benefits are that EcoFoil Under Slab Insulation provides a vapor and radon barrier.

R-Value Of Radiant Barriers

Rather than rating by R-value, all radiant barrier products are measured by their reflective and emissive properties. Once installed, EcoFoil CBF Under Slab insulation is 57% reflective, meaning the product reflects 57% of radiant heat back to its source. There are some companies out there posting big R-Value numbers for their radiant barriers, but those numbers are rating the entirety of the system—including the product, air gap, and other building materials. In reality, most radiant barriers by themselves have little to no R-Value. If you need to satisfy a building code of a specified R-Value, we recommend the use of a traditional insulation in conjunction with our radiant barrier in order to meet code. For more information on R-values, see our How It Works page or contact a member of our friendly service team via chat, by calling (888) 349-3645, or using the form here.

Important - The seams of EcoFoil Under Slab Insulation must be taped together so when finished the insulation acts like one sheet. We recommend our 3" White Seam Tape for this application. Just like the name implies, this insulation can be used under any concrete slab to reflect 57% of radiant heat.

Materials:

Single layer metalized reflective sheet laminated between two layers of strong polyethylene bubbles. EcoFoil Under Slab Insulation has a compression strength of 140 PSI. Our insulation is thin and lightweight, making it easy to conform to your grade and reduces any worry of leaving pockets or voids like traditional insulation.

Shipping Info:

EcoFoil ships free via FedEx Ground. Products ship same-day on orders received before 4pm CT and typically arrive between 1-4 days. Expedited shipping options available. Call us at 888.849.3645 or contact us for more information on shipping options.

Dimensions:

48 in x 75 ft (300 square feet per roll)

~1/4" thick

Spec Sheets:

Download Spec Sheet
View full details

Customer Reviews

Based on 4 reviews
75%
(3)
0%
(0)
0%
(0)
0%
(0)
25%
(1)
J
John McGinn
Floor heat

Gr8 product and very nice people in customer service

B
Brian Demming

Zero response when inquiring about installation

Thank you for taking the time to provide us with feedback. Our sales and service team is happy to answer questions from customers. Please call us at (877) 960-4877 or email customerservice@ecofoil.com, we have representatives available from 7am-5pm CST.

J
James Carty
Great Product!

I purchased this under-slab insulation to use in my 60' x 80' pole barn prior to installing radiant heating PEX water lines and found the product easy to work with and seemed to hold up under heavy foot traffic prior to pouring concrete.
I am looking forward to seeing how it holds up under 6" of 4000 PSI concrete slab.
Highly recommend this product for your under-slab jobs!

D
Don Hoffman
Nice quality

Shipping was super fast and free

Shop Bubble Foil Insulation

  • Free Shipping

    EcoFoil offers free shipping on all products. Expedited shipping options available.

    Shipping and Returns 
  • Product Expertise

    Questions about Under Concrete Slab? We're here to help with installation tips, quantity estimation, and bulk pricing.

    Contact Support