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Solid brick walls. Circa 1890. So I guess not such a likely source of draughts? There are gaps around the joists though. Just fill them with more of the same lime mortar?

Oh, I have an aversion to nails. Much prefer using screws. I like to be able to take stuff apart :) What's the reason you soak them for?

Interesting. Pricey tho: A rough calc using 100mm + 50mm rockwool RWA45 slabs comes to about 150quid for that room. That's just based on area. Never mind all the waste I'd have fitting 600mm wide slabs into 30-37cm joist spaces. So, I take it you mean that completely filling the void is...

I have the floor up in a bedroom above a kitchen. I thought of filling the space between the joists with some kind of insulation. The Victorian joists are about 16-17cm high and 30-36cm apart. As space blanket is cheap, comes in 37cm width rolls and easy to install, I thought it'd be an...

Thank you. I may at some point replace the incoming pipe with 25 or 32mm MDPE. Until that time, I do want all of the flow coming into the house to be available, rather than hitting a single 15mm. The total pipework from there is a 10m horizontal run of 15mm, thru the cellar, then at the end...

Any ideas what the incoming pipe is?

Yeah it's a combo. I realise that my WB 240 RSF restricts DHW flow to 8L/min. DHW flow is fine normally, except when a cold tap is turned on. Then I think the combo is being starved of flow, due to: 1. The whole system being supplied by a single 15mm. 2. The Combi being the very last...

Hi, A black plastic water pipe about 20-21mm OD supplies my house. Is that alkathene? Here's the stop top which joins it to 15mm copper: You can see one side of the stop tap has a British kite mark and with "31" written above it. On the other side has "1/2" meaning half inch of...

I wouldn't be irresponsible enough to put the socket on an external wall :) The existing double socket is on a 'dry' internal wall. I'd be placing the new socket on the driest internal wall in the driest part of the cellar. I'm actually planning on running CAT6 network cable around the house...

It would also be pretty easy for me to poke the new cable up into the kitchen and spur directly from a double socket up there. However, that would make the work notifiable? To comply I have to cut the cable in the cellar and use a junction box (very accessible) to provide my spur. Seems that...

No history of flooding in this area. It's no more damp than one would expect of a Victorian cellar. I should've said there is already lighting in every room and a double socket in another cellar room. It would be easier to break into the cable I described, to provide the new double socket...

Hi, I wish to add a double socket in a cellar room under kitchen. There is an existing power cable passing through the cellar which is a radial supplying just two sockets in the kitchen above. I was told that by an NICEIC registered guy who installed a dual RCD distribution board last year...

I'm guessing you mean that you'd have the air gap just behind the PB and fix the plywood in the air gap? If the air gap was against the wall then the plywood would be behind the 50mm PIR and still run the risk of crushing the insulation? It'd be little better than fixing straight through into...

Thanks for that. Thought as much. No solution, but careful measuring, eh? :) If the extra battens are air gap + PIR thick, as you suggest, there's no issue with crushing the PB? Anyone got any views/experience on relative advantages/disadvantages of having the air gap next to the wall...

Hi, Plasterboard with insulation attached is pretty expensive compared to getting plain PB and PIR boards. Is it better/easier to have the air gap next to the wall or next to the PB? Celotex show using their GA4000 PIR boards, putting them against the wall and putting the battens over...

Oh. He confused both me and ajrobb then :)