The reason we insulate under concrete slabs is for increased thermal efficiency. Basically, you want to stop or slow down the transfer of heat from the slab itself and the ground beneath it.
While any insulation improves thermal efficiency, radiant barrier insulation or reflective foil insulation also offers you other major benefits. These include the following:
Low Moisture Absorption
Radon Resistance
Termite Resistance
Low Water Vapor Transmission
Durability
Safe and Easy Installation
The inside material of reflective foil insulation is a single or double layer of encapsulated air bubbles and one or more layers of reflective aluminum sheets arranged in various configurations. These materials are not susceptible to water absorption. Thereby, liquid moisture does not pass through or is absorbed by the insulation. This property makes it ideal for use under concrete slabs where poured concrete is generally a high moisture application.
Today, almost all local building codes require the use of a radon barrier. Reflective insulation used in concrete slab applications achieves this. The product is extremely durable and the continuous weave of reflective aluminum foil and layers of polyethylene bubbles meet the requirements of a radon barrier material.
Reflective bubble insulation is a mechanical barrier to termites and meets all requirements as an appropriate barrier. For geographic areas that are considered to have very heavy infestation you should refer to your local building codes for appropriate guidance.
When tested in accordance with the ASTM E 96 Water Vapor Transmission of Materials, the perm values were near zero. The design of the material naturally has a very low moisture vapor transmission rate. When used in under slab applications, the product is an approved water vapor barrier. Overlap the seams to form a continuous sheet.
Reflective bubble insulation designed for under concrete use can easily withstand the stress of foot traffic needed in pouring concrete without tearing. In testing the compressive strength of this insulation designed for under slab use in a typical poured slab the product compressed fewer than 10% making it ideal for use.
These radiant barriers are available as a rolled product in various sizes. A sharp razor knife, foil tape, and a straight edge are typically all the tools needed for installation. The product is easily handled and safe to work with requiring no special equipment.
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