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Wet Underfloor heating installation (renovation) (Read 4277 times)
thescruff
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Re: Wet Underfloor heating installation (renovation)
Reply #17 - Aug 24th, 2018, 7:46am
 
Personally, I hate Rockwool and would sooner pay a bit extra for Celotex or similar. I'm amazed it hasn't been banned by now.

Cold/unheated spaces leach heat from neighboring areas so need to be calculated for.
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Re: Wet Underfloor heating installation (renovation)
Reply #18 - Aug 24th, 2018, 4:34pm
 
I've never used it, was just an idea but I had originally planned on using PIR throughout so will continue to do so.

As for no heat I forgot the boiler is in there and so will the underfloor manifold so it will probably be the warmest place in the house Smiley
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thescruff
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Re: Wet Underfloor heating installation (renovation)
Reply #19 - Aug 24th, 2018, 6:33pm
 
Lag the pipes, especially the mass of pipes in the floor that comes out of the manifold.

Keep all the loops at much the same length.
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big_all
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Re: Wet Underfloor heating installation (renovation)
Reply #20 - Aug 24th, 2018, 11:51pm
 
thescruff wrote on Aug 21st, 2018, 5:08pm:
Big-all post misses the point of underfloor heating which should be designed to run at a constant low-temperature I.E. 42c give or take, any addition radiators or hot water should be zoned separately or combi plus 2 or more heating zones.



Any questions please ask


the point i am clumsily trying to make is
underfloor has a greater heat up time so needs to be fully specked and the thermal efficiency off the room is very crutial as is things like open doors and heating off other areas in the house as the heat up time can be hours unlike a radiator for the same situation that can be perhaps half an hour to 40 mins
in general a radiator will give out perhaps 3 or 4 times the heat off an underfloor matt
if the heat input is say 500w an hour and the heat loss is say 350 an hour your heat gain is 150w  an hour so quite slow heating up
where as a radiator for the same situation may be 900w which is less than twice the output but because the heat loss is 350w  the gain is 550w or nearing 4 times the heating rate off the underfloor at least at first when you most need it
and as the heat rises the heating rate improves for a radiator compared to underfloor
indeed if your heating is off for around half the day it may take 2 to 4 hours to get to the level you want dependant on situation
continuos in this situation means on day and night
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thescruff
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Re: Wet Underfloor heating installation (renovation)
Reply #21 - Aug 25th, 2018, 8:27am
 
BA how are you by the way. Underfloor heating should be designed for a constant temperature with maybe a night set back of say 2-3 degs.

It should be run around 42c unlike radiators 70+c making it safer for kids-babies and at risk grown-ups, you don't program it to come for an hour when you feel chilly, which is why the need for a dedicated underfloor heating zone from the boiler.

I will agree, insulation is important so the more the better, but saying that modern houses are leak proof, at the end of the day a constant temperature of say 21c throughout the building is far better than hot blasts from radiators.

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big_all
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Re: Wet Underfloor heating installation (renovation)
Reply #22 - Aug 25th, 2018, 10:03pm
 
good as gold scruffs  Grin
hows you ???
have you met ray reardon or len ganley yet  Grin
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« Last Edit: Aug 25th, 2018, 10:04pm by big_all »  

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thescruff
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Re: Wet Underfloor heating installation (renovation)
Reply #23 - Aug 26th, 2018, 10:27pm
 
Good Alan Thank You, refereeing Nigel Bond in an exhibition next month. In Yorkshire lol
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big_all
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Re: Wet Underfloor heating installation (renovation)
Reply #24 - Aug 28th, 2018, 1:43am
 
hes a nipper lol
he come from derbyshire does he not  Grin
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thescruff
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Re: Wet Underfloor heating installation (renovation)
Reply #25 - Aug 28th, 2018, 9:29am
 
Yes, born in Darley Dale November 15, same day as me  Cool
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