Alan Ambrose

>>> Your basement will displace water the area of the basement plus outside staircase times the depth beneath that where water flows through the ground. This might be 3.3m to base of excavation less the top of the yellow clay shown at 6 feet deep on the second log. It could be 1.5m but it needs to be known. The concrete is likely to be 300mm thick floor slab plus 300mm thick around the perimeter 2.95m or thereabouts high. Add all that up and, at 3.5 tonnes per cubic metre, it needs to equal the mass of water displaced. You should have 10% spare mass but I haven't included the timber frame etc. If you are nearly there but not quite; make the floor slab bigger (adding a heel) and backfill with heavy stuff that will press down on the heel adding mass to resist uplift. <<< Thanks for outlining that calculation and solution - it makes a lot of sense. My concern atm is where the water level will be - the plot is 38m above sea level and as far as I can see (I need to study the contours a bit more) the top of a fairly flat 'peak'.

@DarrenP I like the look of your T design - nice to be able to use them as seating too. I bought dowels for mine but the guys doing the work just wanted to use brackets. 5 years later - I need to put in a few dowels now.

You can also do a bunch of desk research without triggering any nosiness. Anything remotely similar in the area on your local planning portal? Is it in the village envelope? If not, near a cluster of other dwellings?

>>> I can check for dogs and cats You just can't stop technology advancing - wait till they integrate advanced AI into everything: 'Hide event received - mother-in-law detected"

>>> Seems like such an obvious design, I wondered if anyone else here had already built something similar? Yeah, I built a bunch for our garden. Some 1 sleeper high, some 2, some 3. I got the supplier to cut them which made things easier. To reduce rot, I lined the sides with DPC and stapled it in and just screwed big screws through the ends to hold them together. For long thin beds I also used threaded rod between the sides to stop them bowing apart. I'll put up some photos. I'll probably use the same method again on our new build when the time comes.

>>> Which is in part why I'm doing most myself! Agree, because you want it done right ... and preferably first time...

Well they may have a point of course. I don't know what parking is like in your area - but here it's hard and, over the years, 50% of the public parking spaces have been removed by the council and for at least 25% of the remaining, you will get a nail in your tire if you park there (nice area huh). So, work with highways to reduce the impact i.e. attempt to remove only one space rather than 2 or 3. If it comes to committee, point out that yes, you will be removing one space, but then again you will be taking one car off of the roadway by parking on your own land. You could make the same argument to your neighbours directly to attempt to reduce future friction. Did you free up a parking space when you made your garage residential, or are you still holding onto that?

>>> the installation which will be rather yikes. I suppose that would include paying for a transformer? Not sure which part of the install cost you were thinking of? No transformer charge if it's a 'Low Voltage' overhead line i.e. 230V per phase. Ask your DNO and they will give you cost / availability etc.

>>> What an utterly stupid and inflexible way to build houses. Yeah I agree. Proper services void, cavity etc with or without some European ducting is the way forward IMO.

>>> they should move to make them safe. The game the DNOs often play is 'yes we have to do it, we'll do it when we get round to it (expect 3 years)'. Usually you need it done quicker and you therefore end up paying for it. You may get a better result if you're lucky, but you might want to get some back-stop cost estimates. If you achieve a final result better than those estimates, consider it a win. Of course, if you have all the time in the world and a lawyer's mind you may eventually be able to get them to do it for free. For UKPN the two departments involved are 'Projects' who do the quotes and organise the work and 'Wayleaves' who deal with the legals. If you can convince Wayleaves that your case has merit and urgency you may be able to get them to 'make a contribution' to the project cost as decided by Projects. You can save a bit of cost, of course, by doing some of the 'contestable' work e.g. trenching yourself. The UKPN admin is BS and super-slow, but the engineers on the ground are usually friendly and reasonably sensible. Having said that, they did get a geezer to put safety barriers around the trenching work they were doing which was about 0.5m deep. This was in a field and only them (doing the work) and us (keeping an eye on it) were around. Anyone else there would have been trespassing. Be aware that they may bring up some last minute BS like road closures (yeah, UKPN you had about 6 months to think about that) and want to do a different cable route at the last minute. Again, they assume you want the work done pronto and are in no place to argue.

>>> The art in it is to always be shifting your tone words body language to match/mirror the other person, identify their primary concern, determine if it’s reasonable and come up with a mitigation. In your case I’d tell them to eff off. (my highlighting) Well that started my day with a smile.

>>> refused to chase the walls or work in the ceiling. And IMO they're generally not too good / careful / skilled at the things not involving wire / connections / testing. That was probably a 'I don't really want to do this job price'.

You don't say whether you have a vented or unvented set-up. The latter will have a pressure vessel which will partly cushion the hammer when a hot tap is turned off. That's if it's pressures are set correctly and if the tank hasn't failed. If it's a new fault on a system that has been working fine (and it's an unvented system), then I would suspect the pressure vessel.

I don't want to be a smarta55 - but 20 year economic calcs probably don't want to rely on today's grid conditions or supplier pricing schemes ...

Ah double glazed

Thanks Craig

I just noticed this old thread re getting the right silicone for untaped glazing units: Does anyone have a recommendation for the best silicone for untaped units? Glazing silicones in general? This is for installation into black Crittall frames if it makes a difference.

Thanks Gus, for another of your generously detailed answers.

>>> what's the best way of getting a soil investigation done? I realise I was not very clear - I'm really asking 'how do I get the soil investigation specified exactly right given I'm not ready to instruct an SE yet'? I appreciate that once I have it specified I can go out and contract someone to do it.

For interest, here are a couple of old BGS borehole logs each about 90 year's old and within about a mile of the site - the land is all fairly level around here, so I'm not expecting a wild variation from these.

OK so we just put in for planning with two alternative designs and specified for each that 'we would include a basement if soil conditions allow'. I would like to answer the 'if soil conditions allow' question nice and early. The site is rural meadow on clay. The designs are both oak frame with timber cladding and pantiles - so reasonably light. One design is single storey, one is 1 and a half. The basements would both be simple oblong concrete boxes the whole area of a floor, maybe with light pipes, but almost certainly with an outside pit / stairs / entrance. Mostly 'non-habitable' and used mainly for storage, plant room, workbench etc. Given that we don't know which (if either) design will be allowed and are therefore we're not ready to actually have the basement designed by an SE ... what's the best way of getting a soil investigation done? I guess I want to include ground strength / chemical analysis for muckaway and concrete / permeability for drainage and/or soakaway / water table for ease of build. I'm hoping to actually get the basement built winter '23 / spring '24

Well it would be very interesting to compare PH building methods between the US & UK. And I use my real name here too, as I take the view that anything I say on here I would be happy to repeat in a court of law. For me, life is too complicated to pretend to be several kinds of separate digital beings as well as one organic one.

>>> the detonated yield turned out to be 50,000 times greater than anticipated That's often what happens when you calculate in imperial.

Add a smoke detector maybe?

Thanks Phil, Interesting re B&B and basements - to be honest, we've just done the 'look and feel' so far for the planning application together with the overall oak frame sketch, and I've yet to get into the detailed build stack-up. I'll look into that. Alan