DIY Wet UFH??

Dr House

Dr House

Dr House

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Joined
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Location
London
Im thinking about installing our wet UFH system my self and then get someone to come and commission it and do all the connections.

I plan to install it into XPS boards with Aluminium plates.

So does anyone have any tips and tricks? Should I go for 16mm pipe at 150mm Centres or 20mm pipes are 200 centres?
 
If I look at the apes installing the UFH on site this week if you can type without using one finger you should be OK.

Ours is just pinned with clips driven into the insulation and wiggled around with 300mm between the pipes, you can get insulation already routed out for UFH pipes but all depends on your build up.

Have you considered electric, I installed in our bathroom and the electric bills have hardly moved and the kits are cheap.
 
The build up is as follows

11mm OSB3 Deck.
8 mm of felt sound insulation
30mm ESP/XPS boards routed to accept pipes
0.5mm aluminium sheets
20 MM scoreboard on top (thermally transparent and also sound insulation)
http://www.screedboard.co.uk

The total cost should be around £45/m2 I am not considering electric as we have a very large floor area (600m2)

I will then tile on top of it.
 
I installed my UFH onto a solid floor using 80mm kingspan and liquid screed, also into a suspended timber floor using kingspan, sand/cement biscuit mix and wbp plywood.

These are the most common methods for the 2 flooring types, I'm afraid I don't have any knowledge with your specifications.

Have you definitely got enough insulation to stop the heat travelling down? I used more than double this of kingspan.
 
Robbie G said:
You are spending 27 grand on ufh and are on ocuk asking for installation advice. Pull the other one!
Click to expand...

most of the cost is the floor construction I am thinking about trying to save the £2 to £3k install cost of the UFH as it looks really easy to do.

I will still use a joiner to put the screedboard down.
 
It's not something, I'd be doing.

Worst case scenario is it stops working or leaks, who are you going point the finger at, trust me the people fitting the manifiold and balancing the system will just blame you.

Are you having zonal controls as well?

How is the partioning working? are you screeding the lot and partitioning on the top or partitioning first and screeding rooms?
 
Yes we have lots of zones
ScreenShot2012-02-18at192752.png


No screed at all, only the screedboard on top of the EPS/XPS boards
 
Easy to do:D, laying pipe yes, but it's all the other things that are needed, so many things that could go wrong.
Certainly a job I would pass on, better to get a firm to do it, at least you have a warranty.
 
It's probably two days work or two guys there just laying the pipe, we are insulating / DPM / lay pipe / screeding 3 flats a day circa 100 sq m each.

Can't see how you are saving £2-3k just on labour, I suspect the materials and manifolds are in with that.
 
The kitchen why laid pipe under units?

Plenty of reputable underfloor heating companies like JG Speedfit, Nu Heat, Thermogroup UK,Robbens Systems, probably missed a few, will give you a quotation for the installation & commissioning the system, if your provide yours plans.

Used Nu Heat some years ago on a self build, did a great job.
 
Last edited:
Thanks for the info guys

This is what I have had done so far.
Installation of Viessmann Vitodens 200w system boiler 35kw with weather compensated controller together with Cylinder Vitocell 200-v volume of 300 l,four pipe system layout,Vertical flue trough the flat roof
Connections to UH Manifolds flow and return
Installation of secondary DHW circulation system
Installations of 10(5+5) manifolds in bathrooms and kitchen including a pipework
Run a gas pipe from the ground level to the apartment to supply the boiler and gas hob
Materials:
Boiler-£1150.00
Flue,flashing tile ,extensions,elbows,brackets £ 180-£250 depends of the length
Weather compensated controller -£170.00
Cylinder sensor -£39.00
Cylinder 300l -£ 998.00
Pipes and fittigs copper -£300-£450
Deareator- £90
Extra Expansion vessel £150.00 for underfloor heating
Secondary circulation pump,timer,valves ,fittings £300
Manifolds with separate valves to each outlet ,compression pipe adaptors,brackets £500 (UPONOR)
Pex pipe hot,cold water to the manifolds , secondary circulation loops £800
Pipe insulation £200
Small bits and bolts(pipe clips ,fixings etc) £150

Copper pipe and fittings for gas work £450
Labour £ 3000-£3500.00
Click to expand...

Then comes the Floor Screed board, felt, EPS, Alu plates = £27.50/m2 plus install costs

UFH system £6200
Labour to install it £2400

All exc vat.
 
We are paying £12.89 sq m for UFH pipes, design and manifolds and then £14 sq m for modified 65 mm screed & £3.21 sq m for 80mm insulation.

Thats to 39 flats so economies of scale and all that but they are doing 9 flats a visit so 900 sq m circa in one visit, shouldn't be too far dissimilar cost wise.
 
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