saveasteading

I hadn't thought until now, but you are paying £150/m3 for water as well as weakening the concrete and losing the warranty.

And keeping up with the latest regulations and interpretations, and new products, in our own time.

In Spain you can buy this in Leroy Merlin, so like walking out of B and Q with a system. And this is an upmarket one for pretty houses. Below this an obv very simple one showing a panel and a plug. Plug and Play it says. 450W

Valid theory. It certainly reduces their risk for any future problem. In reality, a lot of builders ask for extra water because it suits them and they don't know/ care that too much water is wrong.

And yet... there is a premium for empty m3 in a big truck and the waste (and mess) or shortage can be costly. Let's play. 1 barrowload. Shovel mix 2 barrows to 1m3 site mixer. 1 to 3m3. Volumetric 3+ ready mix. A separate column for people unsure of quantities. Site conditions and pour method also change this. @markcwith 3 wagons of volumetric.. what was the reason?

Leave it. If it happened to be 20°C plus then you might put some polythene or hessian over it, or hose some water on it. But it will be OK.

I agree that I isn't so consistent. It hasn't gone round and round the barrell. I doubt it is ever used for structural concrete eg bridges and high rise

A pump mix is designed according to the local materials. Eg river gravel flows more readily than crushed rock. Then the stone and sand are mixed to a recipe provided by their lab. There is an additive too, basically a detergent. The water content is prescribed too and they even allow for how wet the sand is. That's naughty re theadded water. I've known operatives to sign thinking it was a delivery ticket, not about water. Maybe the driver thought he was being helpful, not understanding the issue. But they should be trained to know. It's a mass footing so should be ok. Adding water for any complex structure or for a slab is not acceptable, so instruct all your people and each delivery driver on arrival next time. Re the quantity. I've never known an issue so the likeliest reason is your estimate... sorry.

Water is only added if requested. A pump mix does not need extra water either. Unless it is a mix on site (volumetric) wagon, then you will only have what you ordered. If it is mixed on site then they will provide more until you say to stop.

I wouldn't worry about that. They want efficient use of their trucks too, so just talk to people. Their truck might have been held up by an earlier client. Did it all work out ok? Any concerns or all sorted? If this was to happen with the slab then it might need some skill so make sure to have a plan. we are here for you. Tell them clearly that you want truck one at one time and truck 2 at another. If that doesn't work for them then discuss. I'm a bit surprised they didn't ask you. otoh the 3 trucks siting waiting is almost bullying. Their choice and if they have nothing else to do, then fair enough.

We've got professionals in today. 2 guys expect to do 300m2 of dpm and eps today, then tomorrow pir 2nd layer and dpm. Day 3 pipes. They started cutting the eps with a hand saw. I guess this suffices for a smaller house. But one has popped out and come back with one of these and a 150mm blade. Watching him use it he can do curves and angles that a hand saw can't, plus very much quicker. I was surprised he didn't have one already. There is no sign of a table saw, or circular saw, for long straight cuts. That's what I had expected. The cutting dust is hand- brushed into the gaps. More to follow.

I'm out of touch with the test costs. But another option would be an Epc assessor, who could simply feel the draught and write ' from my experience I expect a rating of...x of worse.

Is always going to be inefficient because of ground drag even without obstructions.

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A lot of conversions are done without planning or building regs on this assumption. That doesn't make it right or safe. If neighbours don't alert the planners then that won't be enforced. If it's still a garage spec but with people living in it then that is a safety risk as well as enforcement. The vendor could apply for retrospective approvals but hasn't. They want you to take the risks.