Slab Preparation & Reinforcement - nVent RAYCHEM EM4-CW Manuel D'installation

Ramp heating with top layer of stone or paving slabs
60-80 mm
30-50 mm
Ramp heating embedded in concrete / cement screed Top layer asphalt
Concrete / cement
screed ground
If the heating cable can not be fixed to a reinforcement mesh, the installer should use the plastic
spacer or other fixing method to keep the cable spacing consistent.
SLAB PREPARATION & REINFORCEMENT
• In the case of a concrete slab, the mesh
or reinforcement bar must be ad equately
supported so that it is not disturbed during the
concrete pour.
• The reinforcement must be positioned so that
the heating cable will be 50 mm below the
surface of the concrete.
• The reinforcement must be positioned at the
correct distance below the surface of the
concrete to within ± 1 cm.
• Where mesh is used, it must be strong enough
that it will not "droop" when walked on for the
installation of the
heating cable. Use a mesh grid of at least
50 mm. A grid spacing of 100 mm is most
practical.
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80-100 mm for
250-300W/m²
EM4-CW-Cable
Sand bed
80-100 mm for
250-300W/m²
EM4-CW-Cable
Concrete / compacted
substrate
Temperature and
moisture sensor
Soil ground
Asphalt layer Temperature and
moisture sensor
25 mm
• Where a reinforcement bar is used, arrange
its spacing to match the requirement of the
heating cable spacing.
Surface of concrete
50 mm
minimum
Reinforcement support
20-30 mm
Stones / paver
(max. 8 cm)
50 mm
Soil
Heating cable
Mesh