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It's just dense EPS. Snapping with your hands isn't easy but possible, about the same difficulty to snap as a 38x25 roof batten I'd guess. Depends on the type of block, and the manufacturer. The Logix XRV blocks that we have used above ground are 70mm internal, and 102mm external face. Depends who you ask... Logix say it is slightly more thermally insulative, but our builder (who is very clued up on ICF) says its essentially a con and just a coloring agent...

We're going to see what happens by letting nature take its own course for the first year or so. We're not intending to use tap water, that's for sure - way too expensive and demanding for a pond of that size.

Lol...if I write too fast, I'll catch up with real time, and then you'll have to wait more than a few days between updates! ? Don't worry, I'll cover the concrete pour in the next post tonight / tomorrow! In the meantime, I need to get some assistance from @PeterW and @Nickfromwales on my heating system - I have a plumber coming tomorrow to connect up the boiler to the heat bank, and no idea what I am doing!! ?️

Nah. Always leave 'em suspended...

Plan well, and consider where recessed items may be fitted later ( such as FR spots / speakers with FR hoods etc ) and pull the ducts once. got caught out a few times and had to pull out and reinstate a couple, but you'll get the hang of it if you're the 'hands on' type. If you're feeling brave, its far less wasteful if you can at least provisionally fit the outlet 'boots' and terminate as you go. A lot easier to see where you're runs will actually end up if you have given yourself visible targets. The 'all round' metal band to mount the duct securely came from Screwfix.

Can I ask why they insulated the mvhr ducts? You normally only do that if they pass through a cold zone.

You remember that blog that republished Pepys 300 years later? This is the building version.