Andeh

Yep, know the feeling... I was meticulous over the thermal envelope, went away for a week leaving clear instructions for when they installed 8m of sliding doors...they ignored them... Failed to call me and I returned to a massive cold bridge along the entire length, made worse by flush tiles that really conduct the heat. And don't even mention the absolute (expletive deleted)ing asshole lieing dishonest electrician we had to put up with. Lost several grand to his dishonesty. As long as you get it right 85% of the time, you're doing well! OP, can you post up some pics of what you are referring to?

Exactly right, that's how we have it. Then if you find during the coldest period mid january it isn't quite keeping up (does with us in January, as we have a 'good' Insulated and 'good' air tightness.... But not class leading) spralling bungalow, high ceilings and lots of glazing just add an hour or so into the night time tariffs, but even then we pay an average of something like 15p/kWh over the year, and we have an electric hob we use during peak tariff periods due to children and diner time falling into it. We also keep our DHW around 52 degrees a day and go through a solid tank a day, so have it heated morning and afternoon. Edit, we have it so the DHW comes on 5.30-6.30am and 2.30 to 3.30pm)...ie mid cheap period so there is already warmth in the pipes dissipating into the floor when the system swaps over... But not at the end of the cycle where the temp in ASHP is 52degrees vs 35 degrees for UFH... Just my engineering OCD wanting to eek out every degree where I can.

A pressure washer will strip that paint away very quickly (move it to within 6 inches) , just be careful as if you catch your render you risk blasting that off! I'd then just use black masonry paint applied when it's all very dry. All looks to be aesthetics only.

Just FYI though, it's a thin paint so it will show up any imperfections!

Sign up to octopus cosy as a tariff (I can PM a referral for mutual credit for us both if you're interested?) it gives you three super cheap rates spread over the day for people with an ASHP. Then have your ASHP, via the controller timed so that it hits a default temperature you like during those cheap slots (21 degs etc), and leave it as that. We have our DHW via 300L rank timed to come on for an hour morning cheap slot and again afternoon cheap slot... All works very well, and very reasonably priced.

Not sure UFH would work well totally well. Especially with carpet in top. That slab is a helluva thermal mass and with perimeter exposed. Compromise would be going with one that has a thicker insulation bit. In our last place we retrofitted and it was 40mm thick I think? We lost it with a sort of ramp thresholds into the room. Heated skirting boards? Vertical radiators?

2 pack epoxy resin is what I use in the garage. Gives a car dealership sort of finish, but it's easy to clean and hard wearing!

Fair play to them, doesn't happen very often!

With the above in mind, I'd prob do detailing 3 but then aerogel as a thermal break against the block to the screed? Fix it in place prior to screeding so it is sandwiched.

Edit.... Double checked drawings and it might actually be detailing 1, it's been 18 months now and I can't fully remember! Apols Ours doors are sunk flush with the screed though, so we have a flush threshold inside and out to the tiles, and no cill. Means the metal frame sucks up the cold from the thermal bridge and then sends it into the tile/screed, hence my cold feet when I stand next to the frame... But 20cm out it's all lost in the warmth of the slab (hence wife 'well don't stand so close to the door then' comment) Doing it again I should have done a thin layer of aerogel on the inner door frame, between them and the screed and had the tile bridge the 10mm gap... As a crude solution I have retrospectiveky considered. It's the only thermal detail we really messed up tbh (albeit for the top 10% anal self builder, not the buildhub top 0.5% OK insulation detailing).

We were forced to do detail 3 by sliding door company, for flush internal to external floor detailing. It has left a noticable cold bridge of a few inches as the tile butt's up against the door on cold mornings, but with 8m of 2.4m glazing they wouldn't honour warranty unless sat on concrete. Wife tells me to stod standing with my toes up against the glass complaining it's cold under foot. 😁

Tidy job!

Good decision! No way will you regret it with the amount of insulation you've already got!

For that level of extreme air tightness, do what you can with expanding foam then go over it again with silicone and fill the holes that way!

Probably when it was installed 12 months ago! Last resort is ringing out the existing plumber, but he is over 45mins away, and funds are so tight I'd like to try and rule out everything first.

Have a red one and a white one, pressure vessels ! The red one connects via the copper pipe below the immersion switch, and I presume is pressure for the heating circuit.... Where it's plumbed into the ASHP pipework. Not sure where the white one connects, can't follow the pipe behind the cylinder?

House & everything operates as normal, we have lived with this 'condition' for a few weeks now, without leak being visible. If I leave it alone - stop cocks open, all valves open..... all is well, and the pressure 'loss'' is topped up by mains incoming I guess, but technically we loose 0.1bar an hour Yes, seems the total water loss is a 1/2 a cup per 24 hours I guess, but over a few weeks that does add up to bucket of water mysteriously disappearing.... We have two expansion vessels below, pictures below? The toilets are plumbed into the 'non softened' side of the water works...which holds pressure fine! No water meter. Nothing via the tundish, even slid a bit of paper in to see if any drips. --------- Over night I turned off everything, all room valves hot & cold just as something I hadn't tried, pressure held fine (because stop cock --> Pressure gauge --> water softener --> several valves turned off). The next thing I opened up was the softened water feed to the heating systems (ie run a hot tap, this back fills the tank) and the pressure dropped to 1.5bar?? This makes me feel that something around the cylinder area lost some water - but with the valves closed leaving it to the taps, that its not them. I will try testing this again when we go out this afternoon. All departing hot valves closed, so stopcock --> Pressure valve --> Water softener --> DHW tank system --> hot valves closed). If there is indeed a leak in & around cylinder this would show with the Pressure valve dropping I think. We do have a very slight drip from one coupling on the ASHP closed loop, with the glycol in it, few drips a day & about 1 bar loss every other month. Small blue stain where the water evaporates off the floor. Seeing as this is a sealed loop, which I need to open 2 valves to top up every other months I presume its nothing to do with my mains water leak?

Mains water. Master stop cock is out of picture, but as the water comes down it goes via the pressure valve and diverts, one to untreated cold water to house (no leak) other one to the water softener (leak). Every room has its own isolation valves, which should make it simple to identify which room... But the readings have been indecisive so far. Turns out it's hard work isolating the water to the house and rooms with 5 people in the house!!

Few pics here....

We have been in the house for about a year now. Brick & block, block & beam bungalow. Due to irrational fears I turn the stopcock off when we go on Holiday. Our plumber also left us a pressure gauge on the main incoming feed after stop cock. We went away a few weeks ago, and I did my routine of turning off the stop cock...and came home to house with no pressure. I am 99% sure previous holidays (many months ago) never showed this level of pressure drop, maybe a slight one which I put down to change in temps or slowest of dripping taps. Over the last few weeks I have been going mad trying to figure out where we are loosing pressure. We seem to be dropping 0.1 per 30-60mins ish? 2.5 bar over night. We have no visible leaks anywhere, and I have used a damp meter to poke around everywhere inc through the carpets, through render, grout lines - all to nout. I am pretty sure I know where 90% of the pipe joints are in the ceiling (john guest) and there is no sign of anything damp. The drains show no trickle of water going through them, checked them all. We have no dripping taps anywhere. We have a water softener, but it isnt passing water through/no leaks near it. The pressure loss is on the water softener side of the house (so toilets, kitchen tap, utility tap and outside taps - all fine) I am really struggling with ideas now...all I can do is disable the water softener loop & the pressure holds fine. Pic below of the complicated , very sensible, plumbing layout. Disable individual zones seems to sometimes show a potential 'starting point' of leak on a section...but then retesting it later gives mixed results. Any technical people that could advise if any of our appliance connected to the Water Softener side of the water- ASHP, Pressure Vessels, washing machine, dish washer, etc could consistently, but unpredictable, influence the mains pressure after our stop cock? I'm all out of ideas

1.2 or 1.3u I think it was? Ill have to look it up

We have some high end Sunflex sliders, large triple track design about 18 months old. The leading slider thought has started to noticeably 'grind' when opening & closing, definitely on one set of the wheels only. I have tried everything from hoovering through to pressure washing without making any difference. I have also managed to ''lift'' the back of the door up slightly and move it in case it was a stone stuck between wheels. There is no obvious adjustment on the door, and I am all out of ideas. I also think there are some tiny metal shavings being deposited after using it. Anyone ever comes across this sort of thing on large ally sliders? Have reached back out to the installers, so we'll wait and see! Thanks,

To update things here, the installers did come back to resolve, very apologetic over the delays & were very good about it, so back in my good books! Would recommend them if anyone needed help ref Sunflex

Still fit air con! Small price for very effective 'feel good feeling' for those few weeks of the year. Never be able to retrofit it properly after the fact. Paperwork no overheating risk is always optimistic IMO. Also acts as a warm boost on a cold winter night! Never hurts resale value as a premium feature as well.

You want cooling? Fit air con, nothing else works as effectively, and a well Insulated house does risk over warming! MVHR and ashp is a good base line, don't rule out the Grant just watch for cowboys artificially inflating the price to take advantage of it.