Adrian Walker

Copper Sulphate will damage zinc, so definitely a no no from me. There are Lichen Removal Agrents available as it’s a known problem.

You are spot on. All bolts need a torque setting plus additional notes on washers, thread locks, etc to ovoid over engineering and costs.

Jeremy, who used to be on this group, had a simplified version. https://forum.buildhub.org.uk/applications/core/interface/file/attachment.php?id=76599&key=beb16589ffeb7656a272e8a689af6cac

Have you modelled your design in PHPP or similar?

You will get a small voltage drop, but nothing to be worried about. Max load for both is/might be more of an issue.

I have just pointed "notebooklm" to BH and it works OK, but it gives more of a summary, but with links to the sources.

Costing a build per sq metre is not a good way to build or manage. There are so many variables and what do you include. Estate agents don’t use it.

A camera is a better solution and I used a Wireless Logic circle.

Unless you insulate a letter box you could lose up to £120 in heat loss every year.

Tell your builder than you are not paying him if it’s greater than three.

That's not true at all. Having a uniform temperature in every room is the best way to have a comfortable home. And UFH (with a slab floor) and MVHR is the best, and IMHO, the only way to achieve this.

ICF with a SIP roof is a common pair.

you’re over thinking and over engineering the problem. You want a uniform temperature everywhere. Do you have MVHR?

There is absolutely no need to have a gas hob or oven in 2024. The fumes alone will reduce your life expectancy.

Once you have cooked on induction you won’t go back. The control ability is excellent and a lot better than gas. It’s a lot easier to clean.