check this out http://www.insulation.kingspan.com/newdiv/pdf/tf73.pdf I was thinking of using this as replacement floor in my bathroom and tile over it. It is a normal joist and board floor. I want to get rid of the bath and install a stone resin shower tray. Problem is, the TF73 stuff is chipboard but Kingspan say this : ABSORPTION OF MOISTURE Kingspan Thermafloor TF73 zero ODP is not sensitive to moisture of any kind. Its surface is water–repellent and there is no capillary suction. The material is also not hygroscopic. Over a 28 day cycle with temperature fluctuating 20/40°C its water absorption is <0.5% when tested to BS 3837: Part 2: 1990 (1996) (Specification for extruded boards). 1. Will it be strong enough to support the tray and stop movement? 2. Will it be OK in a bathroom environment? Discuss.
You will have to lay it on a flat surface not joists as it needs full support underneath. Will the extra height be a problem I still wouldn't be happy tiling onto chipboard. If you want a lightweight board with insulation qualities that you can tile straight onto then try Wedi board. http://www.wedi.co.uk/using.htm Jason
Check the fire performance. Some of this stuff is polyurethane foam which can burn well and release toxic fumes. Could be wrong in this case but worth checking. PTP
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