Adrian Walker

He is looking to measure pressure not air pressure.

If you need any advice on VAT reclaim speak to Andrew at VAT431.co.uk

Have you thought about using self levelling concrete, CEMEX have Evolutuon.

Yes, use normal glass then get it toughen.

A visit to the National Self Build and Renovation Centre (NSRBC) in Swindon is a good place to start.

Yes, helical piles are a solution. They are often used to underpin, but you do need SE advice.

Yes, I used CEMEX Evolution self leaving concrete on a project, worked very well.

I prefer something home grown raspberry pi, pi pico etc

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.