Morning everyone,
Just trying to make a final decision on how to do UFH.
Background: Property is 1980s, screed over (I think) uninsulated slab, CWI, decent insulation in the loft, double glazing, new doors etc. Screed is being ripped out due to renovations, an extension and water damage, so we would really like to do wet UFH while we can. Due to thresholds, bottom stair height etc, we have minimal amount of potential height build up (probably c.70mm FFL).
So, there are two options that we have settled on, but just trying to establish which would be most efficient:
1. 30mm insulation on slab with 35mm 'Thermio+' liquid screed on top encasing pipes. Where height is an issue (e.g. hallway with staircase) we would use Karndean/Antico to minimise buildup, other areas we'd be pretty much free to use whatever flooring is compatible.
2. 35mm screed on slab with 20mm insulated overlay panels. Engineered wood finished floor in areas where height is an issue. As the overlay panels are foil backed then not sure if we could use a tile or vinyl floor and would be limited to floating only.
It seems that option 1 would provide more insulation and allow the screed to act, at least in part, as a radiator that you would get with a new build UFH system where the slab is kept warm. But, would the minimal thickness of insulation below mean that we'd be struggling to keep the heat in the screed?
In comparison, option 2 seems like it would provide much more rapid warmup and we'd just turn the heating on when we need it?
I'm leaning towards option 1, but grateful for any thoughts the experts might have.
Thanks in advance.
Just trying to make a final decision on how to do UFH.
Background: Property is 1980s, screed over (I think) uninsulated slab, CWI, decent insulation in the loft, double glazing, new doors etc. Screed is being ripped out due to renovations, an extension and water damage, so we would really like to do wet UFH while we can. Due to thresholds, bottom stair height etc, we have minimal amount of potential height build up (probably c.70mm FFL).
So, there are two options that we have settled on, but just trying to establish which would be most efficient:
1. 30mm insulation on slab with 35mm 'Thermio+' liquid screed on top encasing pipes. Where height is an issue (e.g. hallway with staircase) we would use Karndean/Antico to minimise buildup, other areas we'd be pretty much free to use whatever flooring is compatible.
2. 35mm screed on slab with 20mm insulated overlay panels. Engineered wood finished floor in areas where height is an issue. As the overlay panels are foil backed then not sure if we could use a tile or vinyl floor and would be limited to floating only.
It seems that option 1 would provide more insulation and allow the screed to act, at least in part, as a radiator that you would get with a new build UFH system where the slab is kept warm. But, would the minimal thickness of insulation below mean that we'd be struggling to keep the heat in the screed?
In comparison, option 2 seems like it would provide much more rapid warmup and we'd just turn the heating on when we need it?
I'm leaning towards option 1, but grateful for any thoughts the experts might have.
Thanks in advance.