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If I tap directly into the underground drain do I need to vent it- ie run a vertical stack?

Wow!! You clearly know your stuff. Many thanks for taking so much trouble to help. What a detailed reply :D

Yeah. Wondered why separate stacks for soil and waste- but never occurred to me that the soil might be less than 4" . Didn't even know that less than 4" or 110 mm existed! So that's valuable insight right there! Thank you. I'll dig out a tape measure and if it is less than 4" I know the route...

Thanks for your helpful suggestions. I'll try both routes :)

I am fitting the ridge and hip tiles ( Marley Modern) to my extension with dry fitting kits which come with instructions and really do seem convincing. Unfortunately the instructions don't cover what to do when the hips meet the ridge. Nor can I find a special kit for this joint. Is there a...

thanks for quick and clear cut reply. :)

I am renovating a basement flat ( in Glasgow) which has concrete flooring. I need to install a ring of new sockets and would like to avoid the disruption of chasing channels in the plasterwork. The skirting has to be replaced anyway and it's tempting to run the cables behind it. Is that acceptable?

My Prima F is still going strong and I have been advised not to rush to replace it. However it has developed an irritating fault. When it runs on hot water only- all this fine weather :) - there doesn't seem to be enough circulation to allow the thermostat to switch it and so the "emergency"...

The perfect answer to my original question. Thank you. :)

Hi JohnWZ I am in Scotland (Renfrewshire to be exact). I have no idea what I did when I signed up to get the Gwynedd location! Didn't see an obvious way to edit it either but to be honest was not that bothered. The 17th edition is all that matters to this discussion and even if my...

I stand rebuked and am suitably chastened. I shall seek out a SELECT contractor forthwith

The building warrant application specifies 17th edition and work done by a SELECT registered electrician. But avoiding employing an outsider is not just to save the cost of wiring a 5 x4 metre box but all the finicky stuff of a lot of rewiring the reconfigured house. And I have the help of a...

Interesting answers. Never crossed my mind that rings weren't the obvious choice. My question was really about how to run 2.5 cable that wouldn't have heat problems with the insulation board.

I am building a timber frame extension and need of course to install a ring main. Sockets need to to be 400 mm high so I will be running the cable through walls packed with insulation board. What is the accepted practice for routing cables so that they are in sufficient free air?

Thanks for taking the trouble to answer. The 450mm is the standard Celotex size and I just think it makes for a lot of cutting. Like I say 600 centres has to be massively common, but obviously you are right about the variation. Just idle curiosity- now back to work! :)

shopping around for insulation board for my timber frame , I quite fancy the look of celotex. But the board size is 450 x 1200 and with (45mm) studs at 600 centres this would give me a lot of cutting and a lot of waste. Surely 600 centres has to be pretty standard so why the 450 width? Does...

Thanks to you both for explaining that detail. I am happy to get on with it now! :)

so that means the frame screws into the block work and the plaster finish covers the timber frame and closer?

HI Where exactly in the aperture of cavity walls do door frames sit? Do they span the ( 50mm) cavity or sit entirely in the ( 120mm ) timber frame. I am assuming they don't attach to the block work outer leaf?