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HeatStep™ Wire Installation Manual 15
Double-plywood over frame floor
Tile/stone or laminate flooring
Cementitious Underlayment SL-150™,
WebCrete® 95, WebCrete® 98 or Ultra Finish™
Heating cable
Plywood
Underlayment Grade Plywood
Insulation
(per International Residential
Code, Chapter 11)
Joist
Cement backerboard over frame floor
Tile/stone or laminate flooring
Bostik Thin-set
Heating cable
Cement backerboard, Cementitious Underlayment
SL-150™, WebCrete® 95, WebCrete® 98 or Ultra Finish™.
Plywood subfloor
Insulation
(per International Residential
Code, Chapter 11)
Joist
Thin-set over slab on grade
Tile/stone or laminate flooring
Bostik Thin-set or SL-150™
self-leveling mortar bed
Heating cable
Antifracture membrane or cork
underlayment, as needed
Concrete slab with rewire or rebar
Insulation beneath slab
(per International Residential
Code, Chapter 11)