Hot and cold water pipes to BB GF and FF

[iMCaan]

Hi 

 

My understanding is that the continuous hot and cold water pipes, flexible gas pipe and electric wiring have to run in a separate conduit to the kitchen island. Both the gas engineer and the electrician suggested using a 40mm solvent waste pipe as a conduit on both GF and FF. Would a waste pipe as a conduit be OK or is there a better conduit to consider? 

Would it be better to place the conduits directly on top of the BB floor and clip it down to concrete blocks? Or would it be better to create a channel within 50mm insulation and place another 50mm insulation board on top of it?

 

We have a block and beam ground and first floors. Both floors will have UFH.

On GF, we will have 100mm insulation with 50mm liquid screed.

On FF, we will have 25mm insulation with 50mm liquid screed.

 

What would be the best way to take the hot and cold water conduits to the bathrooms on the FF?

option 1: Straight up from boiler/cylinder and run 40mm conduits on top of the beam and block FF.

option 2: Run conduits across the GF and then up straight into the bathrooms.

option 3: ceiling between the FF BB joists.

option 4: some other way.

 

Thank you

Edited November 15, 2023 by iMCaan

[JohnMo]

So obvious remark, why only 100mm insulation on the GF. That combined with UFH is just rubbish. It's pretty poor full stop with or without UFH.

 

I cast my cold water pipes into our slab, I used flexible electric 25mm conduit. With Hep2O or similar inside.

 

Your option questions - the most direct and shortest route

[iMCaan]

Thanks @JohnMo

 

I have had a right telling off from the online community about only using 100mm insulation on GF. This is what the architect put down on the plans. He never suggested using more insulation nor did the builders and it was too late when the online community started advising using more insulation. I'm an inexperienced builder/diyer so I relied on architect and builders for advise. There were a lot of complications do get the planning application and one of them being the stone house being too dominant among other 2/3 bed houses built out of brick. My house is still dominant with the roof ridge being a lot higher than the neighbouring house built in the 1940s. I can't increase the insulation now due to ceiling height. .

 

Sorry just for clarity, did you use flexible electric 25mm conduit for both electric and Hep20 pipe (hot and cold water)?

When you say "I cast my cold water pipes into our slab", do you mean within the insulation under the slab or as you said into the slab?

 

Thanks

 

 

 

 

 

 

 

 

[joe90]

14 minutes ago, iMCaan said:

have had a right telling off from the online community about only using 100mm insulation on GF.

Should have come here earlier (like I did and learnt shed loads despite being a small time builder)

16 minutes ago, iMCaan said:

This is what the architect put down on the plans. He never suggested using more insulation nor did the builders and it was too late

Just shows how behind the curve these “professional” are 🤷‍♂️

[JohnMo]

59 minutes ago, iMCaan said:

Sorry just for clarity, did you use flexible electric 25mm conduit for both electric and Hep20 pipe (hot and cold water)?

When you say "I cast my cold water pipes into our slab", do you mean within the insulation under the slab or as you said into the slab?

We have a slab below the insulation for structural reasons, so cold pipes are within that, zip tied to the rebar. Used flexible conduit over those pipes. We only have one electric cable in the floor to our island, this is in our top slab with the UFH pipes, that was in solid 21.5mm plastic drain pipe.

[iMCaan]

Thank you @JohnMo

[iMCaan]

1 hour ago, joe90 said:

Should have come here earlier (like I did and learnt shed loads despite being a small time builder)

Without a doubt.