CH repipe

[jaydebruyne]

So, I'm helping my brother do up his new house he just bought. Converting a conventional system to combi and repiping system with new rads and valves. 2 floors, max 7 rads on both floors.

I've never piped a system from scratch and not seen it piped underneath the floor before - I've googled and can't find any pics to help me out.

My questions are:

Is it literally just a case of running 22mm pipes (flow and return) close to where rads will be and branching off in 15mm to rads, tee flow and return to take upstairs and do the same?

Other than doing something dumb like connecting the flow and return pipes together, is there an incorrect way of doing this?

Sorry for dumbness but I've never seen it before. If anyone has any pics that would be grand 😉

 

[ShaunCorbs]

And yes run as close to rad eg hall way and t off in 15mm, don't forget your felt strips

 

[jaydebruyne]

View attachment 27126

View attachment 27123

And yes run as close to rad eg hall way and t off in 15mm, don't forget your felt strips

Legend! The felt for the notches you mean? Yup, I did see that one the one decent pic I found..

Thanks Shaun.. 🙂

 

[jaydebruyne]

What fittings have you used on those pipes?

 

[ShaunCorbs]

Legend! The felt for the notches you mean? Yup, I did see that one the one decent pic I found..

Thanks Shaun.. 🙂

yes and press whole install took just over two days

 

[Scott_D]

Is the hot and cold 22mm?

 

[ShaunCorbs]

Is the hot and cold 22mm?

yep straight from main

 

[jaydebruyne]

2 days!!! Bloomin eck... That'd take me a week lol!!! Are they copper pushfit fittings? Do you always fit a shock arrester on combis? I've never seen one on a combi before..

 

[ShaunCorbs]

2 days!!! Bloomin eck... That'd take me a week lol!!! Are they copper pushfit fittings? Do you always fit a shock arrester on combis? I've never seen one on a combi before..

wash your mouth out 🙂 and yes (old taps)

 

[jaydebruyne]

wash your mouth out 🙂 and yes (old taps)

Haha I thought that might get a reaction 😛 ahhh ok

I'm looking forward to doing this job.. Also fitting new bathroom and new vented stack and toilet on ground floor too..

 

[ShaunCorbs]

Haha I thought that might get a reaction 😛 ahhh ok

I'm looking forward to doing this job.. Also fitting new bathroom and new vented stack and toilet on ground floor too..

plenty of pics please 🙂

 

[jaydebruyne]

plenty of pics please 🙂

Deffo (unless I mess it up lol)

 

[ShaunCorbs]

Deffo (unless I mess it up lol)

doesnt matter either way

 

[jaydebruyne]

doesnt matter either way

Will do ... Always good to get feedback to see where I can improve

 

[Scott_D]

yep straight from main

Why on the hot?

Jay - have you got a floor plan of the job, might be able to suggest pipe routes

 

[snowhead]

Watch out for the joist pipe notches.
They may already be too big and too many of them if it's an older house.

I'm sure you must know the limits but if not there's plenty of online guides and horror pictures of over cut joists.

 

[jaydebruyne]

Why on the hot?

Jay - have you got a floor plan of the job, might be able to suggest pipe routes

I'll ask him but I doubt it. Cheers Scott

 

[Scott_D]

Rightmove have them if it was for sale within the last few years
Are you doing it in copper or plastic?

 

[jaydebruyne]

Rightmove have them if it was for sale within the last few years
Are you doing it in copper or plastic?

Copper.. Oh cool I'll have a look. He bought it about 4 or 5 months ago

 

[Best]

Although ideally you want to plan your main pipe runs for the heating fairly close to most rads (but not too close, as you need the distance to crossover and also better for movement at rads valves), you should consider sometimes avoiding main runs in halls. It is a nightmare to lift carpets in halls should any future work need done on the pipes. Running pipework in bedroom, about 3 or 4 floorboards out from wall at hall will often not weaken joist badly and be accessible by simply folding carpet in bedroom back a little. That's if carpets are choosen.
Do always make sure that the main runs have a tee off on all higher runs that will go to a rad valve or whatever, so to remove air on any fill up. Just because the pipes are pumped and will often work after removing air locks, doesn't mean you just pipe them with high spots to cause this.