Cost of installing ufh in new build extension.

[RichD1]

Can anyone give me an idea of the cost implication for changing from wet rads to wet ufh on a new build?

I would assume that the oversite concrete and the 100mm celotex insulation would be the same, it's just that ufh pipes are laid before the floor screed is applied. Obviously there would be some savings on radiators and cop[per pipe, so I'm not expecting a huge cost implication.

Am I correct or have I missed something.

 

[Deleted member 281264]

How big is the space? how many loops?

The material cost will be the manifold, the pipe, the pump, the mixing valve, controllers/actuators depending on how you will set it up

 

[Mr Chibs]

If the room is say 30m² you will be able to use a single room kit, if it's larger you'll need a manifold, pump, blending valve etc.
If you have house radiators, you'll need a couple of zone valves and thermostats so you can run the radiators separate to UFH.

It will cost more doing UFH, but you free up wall space and I prefer the warmth of the room compared to radiators.

 

[RichD1]

Area is about 40m2 and probably two loops.

I'm not too concerned about the material price as there are several online sellers providing all the necessary parts. I'm interested in what you think the labour cost would be from radiators to wet ufh.

 

[Deleted member 281264]

I think new building regs is now more than 100mm insulation. The more the better

Laying it should be 1 days work for a labourer then 1 days work for a plumber to connect, commision and pressure test.

Make sure it's laid properly, I regret not asking for mine to be laid at closer centres (100-150mm) future proofing for a heat pump.

 

[RichD1]

Thanks, I thought it was not a huge job. I guess the floor screed might take a tad longer than for standard screed, probably using a lightweight aggregate.

 

[SpecialK]

Thanks, I thought it was not a huge job. I guess the floor screed might take a tad longer than for standard screed, probably using a lightweight aggregate.

Use liquid screed? Plenty of companies offer UFH installation and screed service all in one. You would want the UFH pressurised and tested before the screed is laid, this can be done from a tap so doesn't have to be hard plumbed in. Can you get a separate feed from your boiler as needs to be on a different loop to your rads.

 

[Deleted member 281264]

Use liquid screed? Plenty of companies offer UFH installation and screed service all in one. You would want the UFH pressurised and tested before the screed is laid, this can be done from a tap so doesn't have to be hard plumbed in. Can you get a separate feed from your boiler as needs to be on a different loop to your rads.

Good point forgot about that,

The UFH needs it's own seperate flow and return, that will be some extra work and possible distruption to walls etc

 

[RichD1]

Boiler has to be moved due to the extension build so there wont be any problems around creating two separate feeds for each.

 

[Deleted member 281264]

Thanks, I thought it was not a huge job. I guess the floor screed might take a tad longer than for standard screed, probably using a lightweight aggregate.

Don't quibble on it too much just pay what it costs. UFH is the future

You will also need an extra zone valve at the boiler, plus cost of wiring up the controls