this technique, the floor loading will be approximately 30 Kg
per square meter at an infill depth of 25mm. Joist spacing should
not be greater than 400mm. It is the responsibility of the architect,
structural engineer, builder, or project manager to ensure that
the joists are engineered to bear the load.
board or plywood provides a sub-base onto which the pipes are
attached. Spacer battens are screwed through into the joists
between the sub-floor and the final flooring material. These
spacer battens must not be less than 25mm thick (recommended
30mm). Battens are included around the perimeter of the room.
The ends of the battens are left clear by 100mm to allow the
underfloor heating pipes to pass from one space to the next.
the underfloor heating pipes have been laid, the space is infilled
with a semi-dry sand/cement mix to the top of the battens to
provide the thermal mass of the floor. This also provides some
sound insulation between floors.
insulation must be used for timber joisted ground floors, fitted
hard up against the underside of the sub-base. Mineral wool
or glass fibre can be used for upper floors, but all through
draughts must be eliminated.
- Suspended timber floor with underfloor heating pipes installed
Photo - Suspended timber floor with underfloor heating pipes