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Radiant Floor - Under Slab

There is a STYROFOAM™ insulation product that is right for every Radiant Floor-Under Slab application.

Radiant Floors Application Information Sheet (98KB PDF)

Radiant floor heating directs heat upward into the room. To ensure effective and energy efficient operation of the system, particularly for under-slab floor designs, including insulation is critical. Properly insulating radiant floor systems makes it possible to provide maximum comfort at minimum cost. Install STYROFOAM™ extruded polystyrene insulation products under the slab to provide moisture protection and to prevent radiant floor heat from dissipating into the ground. Dow Building Materials*** offers a number of STYROFOAM extruded polystyrene products with high compressive strength to satisfy a variety of loading situations, and superior moisture resistance to provide long-term R-value for radiant floor-under slab applications. The products are tough and durable to withstand normal construction site handling and are easy to cut and install.

There is a STYROFOAM insulation product that is right for every Radiant Floor-Under Slab application:
My project or needs are: Recommended Product Solution Installation Instructions/Considerations Building Code Compliance
Insulating floor slabs that incorporate radiant heating systems. STYROFOAM Tongue & Groove Follow instructions from radiant heating manufacturers. Complies with ASTM C 578 Type IV. Meets IBC/IRC requirements for foam plastic insulation. See ICBO-ES ER 2257, BOCA-ES RR 21-02, NES NER 699, Und. Lab. Inc.® Classified, see Classification Certificate D369.
STYROFOAM Square Edge Follow instructions from radiant heating manufacturers. Complies with ASTM C578 Type IV. Meets IBC/IRC requirements for foam plastic insulation. See ICBO-ES ER 2257, BOCA-ES RR 21-02, NES NER 699, Und. Lab. Inc.® Classified, see Classification Certificate D369.