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I currently have an older house with a large new extension. In the old part I have two power showers, 15 rads (with Honeywell evohome valves) these are fed from two large cold water tanks and a hot water tank. In the new part I have a separate hot water tank supplying a power shower, and kitchen...

As it was 16 years ago the OP has probably moved house by now!

All finished.

I've just put in planning to replace the roof on my garage from flat to pitched (including an office space. As its over 4m (5.3m) i'll need planning. at the same time I thought I would add a garden room the side for my wife to do yoga in. this will be around 50m2. (garage is 10m long so coming...

Ok so I can either run them straight down the front of the celotex (chase it out a bit) and plaster over or run them down the edge of the stud (being careful not to nick them with plasterboard screws when I fix).

Sorry PIR insulation ie:celotex

Hi, I've done a Search and although lots of people have this issue there doesn't seem to be an answer anywhere. I have 95mm studs with 90mm pir insulation so pretty much flush. How do I run my cables? Options I see are: 1/chase the pir out? (centre or on edge of stud?) 2/run externally on...

Yep posted the wrong size but picked up the correct one today thanks muggles.

Thanks, Would these work don’t have time to order the ones you listed...

what would you run internally then? 32mm? Seems a bit big to me?

yes it would but that would mean three adapters, the tee itself then 2x reducers. I was hoping to do it in one but I’m guessing it’s not the case now. I probably just use a 20-15mm reducer then a n equal 15mm tee. Hopefully make it fit as limited space under the floor.

Mdpe 20mm in and 15mm copper out both sides of tee.

Anyone ever seen a mdpe (20mm) to 15mm copper tee? I can’t seem to find one and space tight for reducer/pipe/tee. Any other suggestions?

Quick update for anyone considering doing this. All seemed to work out ok. couple of pics below showing makeup and last one with half the fascia done. Cant see a downside as yet although may be a problem if you're up against height restrictions as the 'eves' are now 200mm higher that they should be.

sent them back, ill screw some 150mm screws through the lot instead, (yes I know slight thermal bridge). 18mm OSB3/VCL/150mm PIR/18mm OSB3//Edpm

Yep ill do that thanks

Thanks rusty, Cedral say 30mm I’ll have a look at cembrit.

Thanks but still doesn’t answer the question about batten size?

Bit would 25mm battens be enough?

Warm roof will cost more so probably that. Also insulation 120mm not a lot should really be at least 150mm.