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Yup. Insulate after a week of everything being pressurised, as a drip / dribble will not show so easily otherwise. You cannot use these isolators as attenuators, as I’ve found previously that they are quite noisy when the flow is ‘strangled’, plus the results were very unreliable in practice. Deffo use inline flow restrictors at the appliance. For the basins, 10mm pipe seems to give just the right amount of flow. Buy one and hook it up and see if that works for you, but I never use them for flow attenuation, personally, as clients like things to be as quiet as possible.

Doing a similar 'spring clean' at the moment. Don't think I can post up what I have found that belongs to my old partner. May forward a picture to @pocster, then deny all knowledge (shall strip out geolocation data and replace it with his position).

Plus 1 The heights and positions nearly always change

I put sheets of ply in “regions” allocated for wall hung stuff, with the best planning in the world (and a good memory) it’s difficult to decide on exact positions till it’s nearly finished. Sit on the toilet and decide where exactly you want the loo roll to be 🤷‍♂️.

I recently paid £200 grab and muck away (west midlands/powys). That was for a 6 wheeler circa 16T, £220 for an 8 wheeler circa 20T. Material would need to be accessible by grab lorry and heaped (used my own digger to pile it up).

Where are you getting these temperatures from? Models? Real world data? Bear in mind that to achieve the same U-values as the sorts of foam insulation typically used with concrete, you'll have a significant thickness of cellulose, and cellulose is an insulator (i.e., it resists movement of heat). You therefore can't just assume that the same internal heat gains will result in cellulose reaching 30° while concrete will only increase to 23°. On a warm/sunny day, you'll also have heat traversing the insulation from the outside. Assuming the use of low heat capacity foam insulation with the concrete, heat will traverse the insulation much faster than a high capacity insulation like cellulose. That's because the energy added to the outside of the insulation needs to raise the insulation temperature to cause the energy to move through the insulation, and you need more energy to raise the temperature of a given volume of cellulose than the same volume of foam insulation. Also, because the cellulose is thicker (necessary to achieve the same U-value), heat will take even longer to traverse it than the foam. Why do you believe that concrete returns heat to a room overnight, but the cellulose somehow immediately drops from 30° to less than room temperature such that the house needs additional heating? For what it's worth, I live in a cellulose-insulated house and it doesn't behave anything like how you describe. It's generally pretty resistant to temperature change, much like how high "thermal mass" buildings are said to perform. It tends to take a long time to get warm, for example, but once it does, it retains the heat for a long time. This can actually be a bit of a disadvantage, because after a string of hot days, even aggressive night-time purging doesn't always cool the building fabric enough to overcome daytime gains. Dense-pack cellulose tends to resist air movement. We achieved under 0.6 ACH (i.e., the Passivhaus requirement) with no special attention to airtightness other than a good basic design and paying some attention during construction. Why do you think cellulose houses aren't soundproof? Our house is as soundproof as any other house I've been in, and others on here have remarked on how quiet cellulose-insulated houses can be. Solid feel is something I agree with. I would prefer that concrete or masonry solidity, but it isn't a big deal. I should add that if I were building again, I would certainly consider some sort of ICF construction. My main point is that you seem to be making a lot of assumptions that don't bear out my experience.

Don't you mean supressed? 😂

40mm, no chance! I've just dug the reel out and it's not 25x3 but 9x1! Could have sworn there's a reel of bigger stuff somewhere here. Unlike me to exaggerate about size...

So true. It's a small mercy they didn't restrict 0% VAT on tampons to supply & install too.