July 22, 20233 yr So informative were the posts I've been reading on this forum I became a member. I'm about to embark on extensive renovation of 922metres of space extending over the lower two floors of a 4-floor, 200 yr old Grade B listed building and would really value advice on making the right choices about various aspects of the work. For example: With regard to wet underfloor heating. I'm about to have the basement tanked, on top of which will be laid a concrete slab (150mm estimated depth) and on top of this either 75mm or 100mm foil-backed insulation boards & above this a layer of visqueen + screed with all the pipework gubbins embedded in it. My preference is to use 75mm insulation boards because they cost less, but is there is a measurable advantage in using 100mm boards instead? Edited July 22, 20233 yr by Alex Carr
July 22, 20233 yr Can you dig deeper? I'd be aiming for 150mm. We put in 200mm (new build tho). I'm not sure 75mm would pass BC.
July 22, 20233 yr Min 150mm ideally 200mm. 75mm will have way to much downward heat loss. Making UFH a costly mistake. Pay once, not every month you have the heating on.
July 22, 20233 yr We have 80mm and wish we had fitted more. If building again I think I'd fit at least 150mm.
July 23, 20233 yr 16 hours ago, Alex Carr said: So informative were the posts I've been reading on this forum I became a member. I'm about to embark on extensive renovation of 922metres of space extending over the lower two floors of a 4-floor, 200 yr old Grade B listed building and would really value advice on making the right choices about various aspects of the work. For example: With regard to wet underfloor heating. I'm about to have the basement tanked, on top of which will be laid a concrete slab (150mm estimated depth) and on top of this either 75mm or 100mm foil-backed insulation boards & above this a layer of visqueen + screed with all the pipework gubbins embedded in it. My preference is to use 75mm insulation boards because they cost less, but is there is a measurable advantage in using 100mm boards instead? what is the area, perimeter and U values you have specified??
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