Underfloor heating system design?

[Gray0689]

And wouldn't it do the same with rads till it heated up

If it was that bad all boilers would need back end protection
Esbe valves or the like

 

[johntheplumb]

A rad circuit would return a decent temp after 15 -20 min. Where's a ufh circuit would be retuning low temps to the boiler for long periods of time. Suppliers advised to fit a system link or else a homemade low loss header off the boiler to avoid this. The majority of ufh systems heated with an oil boiler that I stumble upon have system links fitted with them.

 

[Gray0689]

Lol I've fitted a hell of a lot and never seen either
And how do you size your home made LLH lol

 

[johntheplumb]

It would just be an 1" copper pipe lopp from the boiler with a NRV and tee off that. Lol

 

[Gray0689]

It would just be an 1" copper pipe lopp from the boiler with a NRV and tee off that. Lol

Waste of time

 

[markfxy]

Why would it be so low as you put it
A 2inch sand cement screed will crack like mad better make sure they put a lot of fibre in it

Liquid screed and more insulation is your best betv

Doesn't matter if the screed cracks we use a 28mm pug screed cracking doesn't affect the thermal performance of the screed

 

[Gray0689]

Be great if tiled

 

[markfxy]

we're talking 1st floor pug screed you wouldn't use 100mm upstairs, and yes it's great for tiling on :icon4:

 

[Gray0689]

I'll stick to properly insulating and a liquid screed anyday
But that's just me

 

[markfxy]

why would a pug screed be any less insulated?

 

[Gray0689]

why would a pug screed be any less insulated?

What insulation is under a pug screed

 

[markfxy]

200mm rockwool chipboard flooring then pipes clipped to flooring between battens, pugscreed then ply on top

 

[Gray0689]

200mm rockwool chipboard flooring then pipes clipped to flooring between battens, pugscreed then ply on top View attachment 26023

Not for me

 

[tolly]

Not for me

You wouldn't use liquid screed on the 1st floor though would you?

 

[Gray0689]

Yes as I have never done a joist house with underfloor upstairs
Always hollow core slabs

 

[markfxy]

Not for me

New that was coming!, Yes you're right mate you should stick with what you know I think you're getting confused:yesnod:

 

[tolly]

I should have said last night that I meant timber floor.