Reznor EFMA Unit Installation Manual - Manual (Page 25)

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120V current will produce virtually no heat. It is therefore very important to
connect the right product to the right voltage.
Q.13: Can EFMA be installed over concrete?
A.13: Yes. Apply a concrete sealer before installing the EFMA system. See Section 4.
Q.14: Can carpet be installed over EFMA?
A.14: Yes, if the system is completely embedded in self-levelling cement. You can
install low-pile carpet over the slab if the carpet’s thermal resistance does not
exceed R = 1.40 (RSI = 0.246).
Q.15: Can wood flooring be installed over EFMA?
A.15: Yes, you can install multilayer wood flooring (Engineered flooring), provided
its thermal resistance does not exceed R = 1.40 (RSI = 0.246).
Q.16: Is the use of self-levelling cement mandatory when installing ceramic tile?
A.16: If the room is small, an experienced tiler can do a good job without using self-
levelling cement, but this method is not recommended. The heating cable must
always be completely embedded in cement or an equivalent binder (cement
glue, ceramic glue, self-levelling cement). If the room is medium-sized or
large, the use of self-levelling cement is strongly recommended to ensure the
ceramic is perfectly levelled.