First Floor UFH options

[richo106]

Hi all

 

I had a chat with my plumber today regarding first floor UFH options.

My house is still awaiting the roof to go on but I have the peel and clean 22mm T & G floorboards already installed.

 

My plumber said I have 2 options:

 

1. low profile overlay system that is egg crate matts and then would need a thin layer of screed over

https://www.theunderfloorheatingstore.com/profix-floor-panel
pros - would be more effective 

cons - expensive option, would add floor build up (around 20mm), i think more complicated to plan out other items, have to make sure screed wouldn’t run down to ground floor

 

2. clipper plate between joists, and then install from below.

pros - cheaper, no height build up 

cons - how effective will it be? Trickier to install…would have to batten off ground floor joists to aid install? Guessing it would be almost impossible to thread through posi joists?

Has any body used these methods?

Are they both viable? What would people recommend? The mrs is worried upstairs will be cold with option 2

 

For info, it will be fed by ASHP. Ground floor will have UFH in screed on 200mm PIR

 

Any advice/comments much appreciated 

[JohnMo]

I found this the other day. Useful to compare different UFH systems.

 

https://www.jupiterunderfloorheating.com/heat-output-data

[Nickfromwales]

Hire a track saw, cut 25mm channels perpendicular to the joists, and drop in alu spreader plates. Pipe up, fill and test, and then apply a secondary 18mm deck atop with D4 glue and screws. 

[richo106]

Do the aluminium spreader plates work with ASHP effectively?

 

My worry is the heat will have to travel through 22mm flooring and then tile

backer/tiles or underlay and carpet

 

Will this feel warm under foot?

 

 

[JohnMo]

UFH shouldn't feel warm under foot.  The surface temperature is well below body temperature, so doesn't feel cold but also not warm - in my experience 

 

 

[richo106]

  On 24/02/2023 at 08:25, JohnMo said:

UFH shouldn't feel warm under foot.  The surface temperature is well below body temperature, so doesn't feel cold but also not warm - in my experience 

 

 

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Thank you, good to know.