THERMAL MOVEMENT | Ram Plastics Supplies | Independent Plastics Builders Merchants



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Thermal resistivity is normally referred to in terms of a U-Value.
Freefoam profiles, due to the composition of their cellular inner
core, offer thermal performance far superior to timber or other
natural building products. Due to the varying nature of the profiles
in terms of configuration and thickness, thermal performance can
only be generalised to between 0.06 and 0.1 W/mK.
Expressed as the coefficient of linear expansion, Freefoam profiles
vary between 5 and 6 x 10-5 per degree Celsius. When fixed in
accordance with the manufacturer’s recommendations, and in the
British Isles, they perform satisfactorily. They should not be
installed where ambient temperatures are likely to exceed 40
degrees, such as in close proximity to boiler flues. They should only
be installed when the external air temperature is between 0 and 30
degrees. The thermal movement that occurs between day and night,
sun and cloud, winter and summer should be allowed for as described
in the installation recommendations.
The external skin of Freefoam profiles is impermeable and cut
ends, due to their closed cell structure, are non-absorbent.
The weather resistance of installed products (specifically their ability
to exclude rainwater) depends on site workmanship. When the
recommendations of the manual are followed, rainwater should be
excluded up to 5 storeys in height.
Freefoam profiles are easily worked with conventional woodworking
tools: they can be sawn, shaped, cut, drilled, routed, nailed, screwed
and glued. Saws must have fine-toothed blades, and power saws
should be set at their highest speed level, with carbide-tipped blades.

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