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Is that bit of electrical trunking related to the new bathroom? The bath/basin wastes are going into a hopper; is that new, and is it definitely not for rainwater? Go for it.

What we’re talking about is the method shown in the video in the second (?) post.

The width of the board needs to be the distance from one edge to the opposite edge, right?

Sorry Freddy, if he wants hexagons with sides of 100mm, using the method in the video, he wants to start with a length of wood 173mm wide.

If no-one here knows, try pavingexpert.com.

Well no, the worst cases are that someone gets an electric shock or it catches fire and burns the house down. We don’t know enough to judge how serious the problem is. I think that’s unlikely unless there is some visible damage. Or find the fault and repair it. Trouble is, small appliances...

I think you need to google that. I’m sure a few PhDs have been earned by materials scientists studying the subject. While I cannot explain the exact mechanism, it is certainly what happens.

Yes. No. Better sacrificial mortar than eroding the stones. If the evaporation is through the stones, rather than the mortar, then the stones will spall. That is irreversible, unlike eroding sacrificial lime mortar which can be replaced. This is all well established. The rest of your post...

Then you don’t need an additional one. If the outdoor socket is mounted directly over the hole, no. If the cable needs to run along the wall from the hole to the socket, then it needs to be suitable cable (i.e. UV-resistant), or protected in conduit. The issue you will have is that the cable...

Just in case anyone’s too young to have learnt this at primary school, search for “how to draw a hexagon using a pair of compasses”.

1.5mm² flex.

Do you not already have RCDs in your consumer unit? If not, you should consider upgrading that.

They are "resilient bars", which are supposed to acoustically separate the ceiling from the joists. I think you could probably run your cables anywhere you want in there, within reason.

I think mine is called “sprint”. Or maybe “spirit”. Something ‘sp” but not “sport”.

I'll assume that your "sparky partner" understands the issues with an electric shower on the end of 50m of cable... Unless you have a huge budget for something all-singing-and-dancing, I think modern electric showers are probably all pretty similar. I bought a 9.5kW Mira from Screwfix, it's fine.

No, it could be pretty significant if you put a lot of screws in. Steel conducts something like 1,000 times as well as the insulation. This is normally discussed in the context of walls, where there is a concern that you’ll have a pattern of cold spots on the finished wall surface that will get...

Those numbers are good. Do you always see those numbers, or do they vary? Do you see the pixelation on all channels? What sort of pixelation is it? Do you see less pixelation viewing the same channels elsewhere?

A screw carries heat because it is made of metal, which is a good conductor of heat. Do you understand why you have PIR boards in the floor?

I wondered about those, but would they be strong enough to hold down a board in an “unnatural” position? I’ve never used on myself.

Just remember that the screw carries a lot of heat. One 4mm steel screw carries as much heat as about 100x100mm of PIR.