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In this type of floor structure, mineral wool insulation is laid between the joists.
Aluminium heat emission plates are fixed to the joists.
The underfloor heating pipe is fixed into the grooves in the aluminium plates which have the effect of making the whole of the plated area the radiant surface.
After the underfloor heating system has been pressure tested, the wooden sub floor can be installed.
With a room temperature of 20 deg C and a floor temperature of 27 deg C, the maximum heat output from an aluminium plated system is 70 W/m.

ROCKWOOL INSULATION

Rockwool is manufactured from volcanic rock which is blended with coke and limestone.
The materials are heated and melted in a furnace, then runs on to a series of rotating wheels which spin the drops into fibres.
The fibres are then coated with resin and water repellent mineral oil.
The loose material is then compressed, oven cured, then cut into rolls.
Rockwool is denser than glass mineral wool and it is made up of short strands which give it a high compressive strength. It is also non-combustible.
The thermal conductivity of mineral wool ranges between 0.039 W/m and 0.031 W/m.