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Wet underfloor heating question + experiences

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Hi , I am doing a rear extension - extending the living room and kitchen (2 rooms next to each other)

I am wanting to put underfloor heating . The old part of the house is wood joists (with approx 600mm void) and the plan states to put wood joists for the floor.

I am wanting to put UFH in the kitchen ( possibly the living room) however when I am reading around UFH generally concrete floor is being recommended.

Would concreting the extension bit cause any issues? Anything I need to keep in mind ?

What would people recommend? Stick to wooden joists and put the over lay UfH and put insulation betwen joists?

2) the reason why i am in 2 minds about putting UFH in living room is because I wanted to carpet the floor and I am reading the heating would need to work harder to heat up along with it not being concreting not sure if it is worth while .

3) someone has advised to do the wooden joists / insulation boards and then UFH however that will raise the floor by 40-45mm i suspect. I have hallway /WC room / kitchen and 2 living rooms downstairs . If i was to do UFH besides just the kitchen which is the first option I would do all the above rooms except the one living room as it gets warm enough with current radiators and wanted to keep it as an option , so there would be a 45mm
Step going into that room. Unless i insulate that room the same as others without putting the UFH mat so its level … just thinking my options

My first post here so please be kind
Any help / advice from experiences will be greatly appreciated
 
Because the exsting floor that its going to be combined with is already wood joists
 
MY original build concrete / screed / tiles UFH is a pita... partly cos it's an oil boiler, partly cos they didn't know what they were doing so have cold spots and small rooms with inadequate heat (utility and downstairs loo).

I'd have proper radiators any day (as is in the upstairs zone).
Just avoid the fancy designer / vertical rads.

NB carpet for UFH heating needs to be "low tog" to let heat through and is likely to be limited choice / thinner / less comfortable. YMMV.
 
Because the exsting floor that its going to be combined with is already wood joists
It makes no odds what the existing floor is. If there are vents on the proposed extension elevation, these can be extended out....





However, if it's because the over-site is crap then I'd opt for a B&B floor.
 

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