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I'm refitting the GCH system in plastic throughout and installing new radiators. DO I need to earth all the radiators?

Both are barrier pipes and from what I've found on the web PEX seems better and more advanced: http://www.plasticpipe.org/pdf/tn-31_difference_between_pex_and_pb.pdf So, I'm surprised to find in Toolstation PEX is the cheaper of the two! What are the differences and what do you guys use?

What would you normally do for a utility room then? I was planning to attach it to the kitchen sink waste (1 metre high) but can't box in on that sort of height through the house.

I'm running a GCH system in it. I'm going to use the pipe securing clips with nails every 3 or 4 joists when running over. How about running alongside joists? Do I need to support the pipe or can it just rest on the plasterbaord of the downstairs ceiling?

I'm looking to locate one about 4.5m from the kitchen sink waste and to run it under the floorboards. Is this an acceptable distance?

Cheers folks - the guideline of 22mm feeding upto 3 rads then 15mm from there sounds sensible and was the sort of rule of thumb I was looking for. I'll design with this principle. Thanks again!

It was actually teh plumber on my last flat who suggested I could have run the GCH in future. I thought the same as you guys are saying - that you need training, but having seen that I'd replumbed the entire hot and cold water in teh flat and built a kitchen he said that in comparison running...

I'm going to board over existing lathe and plaster. Is there any disadvantage to using 12.5mm board apart from 30p per sheet and the extra weight to lift? (it's stronger apart from anything else)

I'm basically building a sloping wall above a stairwell on the first floor - the idea is to gain more space in the room neext to the stairs rather than have a huge wasted space above the stairs on the 1st floor. Is this BC notifiable? Obviously if soemone fell through it from within the room...

I've also heard talk of people using CLS timber which is a Canadian standard but popular here, but presumably the C16 has no relation to CLS?

I'm fitting a new door frame and as well as freame fixing it to the brickwork I'd like to use a cement mix to make it really solid when set. What sort of mix should I use for this?

Thanks. Is the C for carcassing?

I've replumbed my flat previously in copper qwith 15mm everywhere except the last stretch to the boiler. I'm now installing GCH and a new bathroom into a three bed house and will be using Speedfit. A couple fo questions about pipe sizing (I've got a combi boiler): I'm creating a new...

I've built one before with a mate but he supplied the timber and I forget. PAR, carcassing or something else?? It's going to be 4 by 2

It's an unusual layout - the stairs divides the two reception rooms like with a side doored house, but the door's at teh front. The bathroom is dnwostairs and I'd like to move it into the back (3rd) room upstairs. However, without going into details and diagrams, in order to do tis and corridor...