Andeh

It's sad, but I do see it as a tax on stupid people. Better they learn their lessons on a £xx posh fan, and feel cheated, mugged off & embarrassed then when they fall for a dodgy email and take a £xx,xxx hit which the bank then refunds - at the rest of our expense.

Id be looking up if there are any sink hole type construction projects in the wider national area. Surely the approach to resolving those is not dissimilar to what you need to achieve here? Id be looking for engineers or companies which have been involved in those sorts of projects, and see their views on it.

But with batteries, smart grid, vehicle charging, vehicle2load, import/export and smart tariffs.... The peaks and troughs of weather dependant generation can be smoothed out quite easily. Why form a strong judgement, when you only understand part of the topic?

Please let us know how you get on!

I went through the same worry OP, where I wanted full flush and it's about 5mm low floor to sliding doors inside, and 15mm outside. The outside as we added a third slider which added a lip as the door sits over it's track... And I forgot to check. Haven't thought about it in ages....

Especially the pesent isnt dead enough, and has just enough energy to make a run for it. I never wanted the ruddy cats in the first place.

You're already in the top 0.1% of air tight homes, spending £2,000 (and £2,000 of TF money for use elsewhere...) to enter the 0.01% of homes is not worth it IMO. Future sellers won't care, friends and family won't care and realistically you'd never notice the difference even if you really really tried on a really windy day. The second anyone opens a door you've undone several hours of airtightness anyway. Ours is at 2.7 (no sniggering at the back...) as a hugely volumetric bungalow with several sliders everywhere... And despite wibbling about it for years, and being obsessed with trying to seal everywhere that I could.... Its fine...

That is lovely!

Sorry to hear it OP, these houses can be such a massive emotional and physical heavylift.... But the shitshow will be temporary and the satisfaction and enjoyment is a lifetime. I promise you it is all worth it in the end, but you do need to smile and endure.

We did, is just stick 20mm PIR against the external wall, and ??mm at the bottom of the cavity and then back fill with concrete. That way you've mitigated the worst of the thermal bridging and have a strong support throughout. Wish that's what we'd have done, but I was away with work and due to 2.4 x 8m sliders they backfilled entirely with concrete due to worries about the weight and movement destabilising. It's held firm, but we do have a sizable thermal bridge now.

Natural movements between the two supports would be more of a concern then the raw bridging abilit I think. Slight cracking and debonding on one side could be an issue?

Great write up! On my to do list ia find a way of both buttons doing a full flush, and ensuring the full flush is indeed a FULL one. Young kids means they only press the button once/lightly/at random, and the waste never fully goes.

It's coming together well. Don't forget internal lights and cabling for it. Maybe an armoured cable up and over for vehicle charging point in future? When we built our place we did the garage a similar height, so I could get my land rover in the garage, with a roof box on, and so it could be opened inside the garage for loading before and after holidays. I was worried about how much it would impose on the rest of the house (bungalow), and whilst it probably does a bit.... You forget about it amazingly quickly.

We have a Monarch midi system, which 3 years in... Just works well! Id recommend it

"Proper DIY" did a video on YouTube of it, which looked pretty DIYable for a smallish area! Can't find the link as on phone, but will dig it out later if you don't find it.