North America – Radiant Floor – Under Slab

Warm and Cozy Underfoot

Toasty toes and concrete slabs? Absolutely – with radiant floor heating and rigid foam insulation from Dow.

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, insulation is critical.

U.S.

Project Specifications	Recommended Dow Solutions
Insulate under floor slabs that incorporate radiant heating systems Provide moisture protection Prevent radiant heat from dissipating into the ground Learn about high-load slab applications.	Square edges on all four sides 3/4"-4"thicknesses Two board size options 25 psi	STYROFOAM™ Brand Square Edge Insulation
	Interlocking fit 3/4"-2"thicknesses Three board size options 25 psi	STYROFOAM™ Brand Tongue and Groove Insulation
	Enhanced Installation Learn more about weatherization	GREAT STUFF PRO™ Gaps & Cracks Insulating Foam Sealant⁽¹⁾ FROTH-PAK™ Foam Sealant

(1) Consult the label and Material Safety Data Sheet carefully before use.

Literature
STYROFOAM™ for Radiant Floor/Under-Slab Application Information (96KB PDF)

Canada

Project Specifications

Recommended Dow Solutions

Insulate under floor slabs that incorporate radiant heating systems
Provide moisture protection
Prevent radiant heat from dissipating into the ground

Learn about high-load slab applications.

2' x 8' (600 mm x 2400 mm) boards
1"-4" thicknesses
Butt edge and shiplap edge options
30 psi (210 kPa)

STYROFOAM™ Brand SM Insulation

Enhanced Installation

(1) Consult the label and Material Safety Data Sheet carefully before use.

Literature
Below Grade Insulation: The foundation of effective energy savings (Canada) (536KB PDF)
Below Grade Insulation: The foundation of effective energy savings (French) (536KB PDF)
STYROFOAM™ for Radiant Floor/Under-Slab Application Information (96KB PDF)

Dow can help you get to the bottom of your foundation insulation questions.