Reznor EFMA Unit Installation Manual - Manual (Page 13)

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IMPORTANT!
Do not install a radiant floor heating system on a noninsulated or poorly insulated
subfloor, or over a crawl space.
The efficiency of this type of primary room heating system will depend on factors such
as surface area, heat conductivity of the floor covering, insulation on outside walls,
etc. We recommend that you verify these points and seek professional advice before
investing time and money.
3.3 Typical Floor Coverings
IMPORTANT!
The thermal resistance of the floor covering must not exceed R = 1.40 (RSI = 0.246).
There is no such limit for the subfloor.
Table 3.3 Thermal resistance values for floor coverings
Typical floor covering
Thermal resistance
R RSI
Vinyl tiles 0.20 0.035
Linoleum 0.22 0.039
Ceramic 0.25 0.044
Low-pile carpet 0.70 0.123
Parquet flooring 0.70 0.123
Floating floor 10 mm to 16 mm ( 3 /
8
” to 5 /
8
”) 0.70 0.123
Wood on lathes (strapping)* 2.10 0.368
* The floor covering highlighted in grey is prohibited.
IMPORTANT!
For engineered wood floorings, laminated hardwood flooring, vinyl coverings, and
linoleum glued to a concrete surface, consult your floor covering manufacturer to
ensure they are compatible with floor heating systems.