- Thread starter robgil
- Start date
You cannot have uderfloor heating and expect to have breatheable floor as originally intended. CORRECTION !!!, you can, but most of the heat will travel in the opposite direction . YOU must have one or the other, anything in between is a compromise of total efficiency if you decide to use underfloor heat
Middi
Middi
It looks like LECA might be the only option, UFH might go down but at this point in time I doubt it will, cash flow will dictate this.
so, 100mm loose fill leca, 100mm hempcrete slab and 50mm lime/sand screed, all using nhl3.5.
Does this sound about right?
If I do put in UFH a 75mm screed will be used to put the pipework into.
Old floor brick pamments ontop.
It's a bathroom floor with 3 clay lump walls ( 2 external) and one internal brick plinth with timber frame ontop.
so, 100mm loose fill leca, 100mm hempcrete slab and 50mm lime/sand screed, all using nhl3.5.
Does this sound about right?
If I do put in UFH a 75mm screed will be used to put the pipework into.
Old floor brick pamments ontop.
It's a bathroom floor with 3 clay lump walls ( 2 external) and one internal brick plinth with timber frame ontop.
250mm total sounds too little to me. When I was looking into LECA floors, I was calculating something like 430mm if I remember correctly. (For comparison, our floor is base layer, 150mm concrete, 100mm Celotex, underfloor pipes, 75mm screed.) BC will want thermal figures for your floor so that will probably dictate what thickness is required.robgil said:
Personally, I would go for the underfloor if at all possible - we love ours (and lack of radiators). Self install cost for pipes / manifold was around £900 for our entire downstairs.
Feltwell
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If cost is the issue with installing UFH, can you not just put the pipework in for now and leave the manifolds & ground source heat pump setup or boiler until a later date? I'm presuming the pipework is not the expensive bit.
I wont be digging down half a meter , I've gone down to the outside ground level and feel uneasy about going down much further due to no foundations under my house, 100mm above ground level and 200 max below would be about the best I would be able to go. It's a small room and subsidence , sinking etc is very very unlikely. I've seen 2500l oil tanks with a fully laden weight of around 2300kg's sat on less with no ill effects, I think a bathroom will sit quite happily on 100mm hempcrete slab with a screed and floorbrick topping, 
I was hoping there might be a more efficient alternative to LECA.
I was hoping there might be a more efficient alternative to LECA.