EcoFoil Under Slab Insulation is a patented advancement in below-grade thermal protection and is purpose-built for concrete slab applications. Ideal for radiant heat systems, this lightweight material conforms easily to grade without creating air pockets or voids. The insulation is 1/4" to 5/16" thick and features a reflective metalized layer fully encapsulated between two durable polyethylene bubble sheets, preventing damage during installation or concrete curing. With a compression strength of 140 PSI, it stands up to the demands of slab pours while maintaining consistent thermal performance.

The encapsulated design protects the reflective layer from soil acidity and moisture exposure—common issues that degrade standard bubble insulation when placed underground. By positioning the foil within the bubble layers, the product maintains a required airspace for reflectivity and prevents corrosion, ensuring long-term performance in demanding slab environments.

Engineered Thermal Control for Radiant Heat Slabs

EcoFoil Under Slab Insulation reflects 57% of radiant heat back toward the slab surface, reducing heat loss into the ground and improving system efficiency. This reflective performance helps radiant floor heating systems warm faster and operate more effectively. Additionally, the insulation functions as both a vapor barrier and radon barrier, adding essential protection beneath concrete floors.

Durable, Encapsulated Construction for Below-Grade Installation

Traditional radiant barriers and exposed-foil bubble insulation are not suitable for underground use due to corrosion and direct contact with soil and curing concrete. EcoFoil Under Slab Insulation solves these issues with its protected reflective core and strong bubble structure. Once seams are taped, the material acts as a single continuous layer that withstands installation stress and provides long-term energy savings.

Key Features

• Patented encapsulated design: Protects the reflective layer from corrosion and maintains required airspace.
• Reflects 57% of radiant heat: Enhances radiant floor heating efficiency by reducing heat loss into the soil.
• High compression strength: Rated at 140 PSI for reliable support under concrete slabs.
• Lightweight & conformable: Lays flat without creating voids, unlike bulk insulation.
• Built-in vapor & radon barrier: Adds critical protection for below-grade installations.
• Durable multi-layer construction: Polyethylene bubbles laminated around a protected reflective core.
• Seam-taped system: Must be taped to perform as one continuous sheet; 3" White Seam Tape recommended.