help needed on pipe sizes etc

[Neilm]

hi all
im renovating a 3 bed semi d i got a few months back. im putting in a all new central heating systems. i got all the rads (7) there size for each room and trv for a good deal a long time back. i need to run all the pipe work now so i can close up some 0f the rooms.
im running really low on cash as i never expected to do so much work to this house.

so my questions are
from were the boiler will be i was thinking of runing two runs of 3/4 pex flow and return
and then use 1/2 pex to do the drops to each rad but iv have just opened the vavles that came with the rads and they are 15mm so is it best to use 15mm for the drops to main 3/4


any help on pipe sizes would be great .
thanks

 

[ShaunCorbs]

Where in this lovely world are you ?

 

[king of pipes]

Normal practice would be to use copper on the drops as it looks neater and can be decorated in with the room , i personally try to avoid plastic fittings where ever possible but sometimes it unavoidable especially on new builds, if you are a competent DIY er then there no reason why you cannot fit the radiators yourself , but anything involving the boiler and gas supply you will need to employ a GSRI best of luck kop

 

[Old Account]

As above really, I would also prefer either the drops in copper which will give a much better finish or if you aim for a better finish chase them into the wall. This way you will hardly see any pipework. Obviously there is more work and perhaps money involved due to the fact you require different rads.

But as KOP has mentioned you best way of doing the drops are in copper.

Regards,

Ron

 

[Neilm]

Hi I have fitted the up stairs rads to walls just to get them out of the way just not any of the pipe work yet.
The upstairs rads will all run into the floor and I have the ceilings down downstairs so easy access for all the pipe work .

I was thinking of copper for the drops would be neater
I was going to use compression fittings
Should I stick to 15mm pipe or do the copper drop in 15 and use a 15mm x 1/2 315 (as I have some 1/2 pex all ready) to run to the 3/4 pipe


I will not be going near the gas /boiler

 

[king of pipes]

Post a picture of what you plan to do we may be able to advise you further. Cheers kop

 

[Neilm]

Post a picture of what you plan to do we may be able to advise you further. Cheers kop

Will i draw it out? I may have one pick of the upstair rads in place

 

[king of pipes]

Ceiling is down take a picture from below

 

[Old Account]

I'd go with soldering if hidden in the ceiling

 

[Neilm]

Ceiling is down take a picture from below

I'm not in the house at the moment.
This is a quick drawing