sm14 - 3 Pages
Floor construction SM14 – 14mm Fastflo® in screed installed with building mesh
Concrete or screed
Nu-Heat edge insulation
14mm Fasto tubing
A142 builders’ mesh
250μm polythene protection layer
Insulation (see note below)
Screed: Standard 65mm deep sand and cement screed should
be used at the ratio of 4 parts sand to 1 part cement.
Care should be taken to ensure good contact between the
underfloor heating tubes and the screed. It is important that
the screed is as dense and consistent as possible to aid heat
Liquid screed: If liquid screeds are to be used please contact
Nu-Heat for installation information, or see website at
The screed must be sufficiently dry before coverings may
Ground floors: The insulation beneath the floor should be
70mm ‘Celotex’ or equivalent, or it must conform to Part L of
the Building Regulations, whichever is the greater.
Upper floors: Insulation should be to a minimum of 30mm
‘Celotex’ to prevent downward migration of heat
Apart from the edge insulation strip which is supplied by
Nu-Heat, insulation materials are most economically sourced
from local builders’ merchants.
Note: The ‘edge insulation’ supplied by Nu-Heat should be
fitted around all walls as an expansion medium. On external
walls additional insulation material will be required to comply
with Building Regulations.
P. 2Floor construction SM14 – 14mm Fastflo® in screed installed with building meshAll systemsSequence of laying the floor1.Lay the damp-proof membrane(dpm),...
P. 3Floor construction SM14 – 14mm Fastflo® in screed installed with building meshAll systemsSequence of laying the 14mm Fastflo tubing in the floor1....