Dave Jones

They have done a nice job off the edpm in fairness it looks smart. How far under the tiles have they lapped it up and did they osb under the tiles ? I think abutment vent's will be hard to get working right as they will push the bottom tiles up. Easiest and cheapest is to use some mushroom vents. I'd do 4 along either side of the lantern and 2 behind it They really easy to flash in with the edpm tape. Lastly i also think you need more airflow in the pitched roof, assuming its not a warm roof. There doesn't appear to be any eaves vents where the 3 faces join the flat roof. You need air to flow up and over to take out the moisture that will inevitably collect in there when it gets cold. I would put in 9ish tile vents while you have niece easy access, they are cheap and you will have no worries come the winter. https://www.roofingsuperstore.co.uk/browse/ventilation/flat-roof-vents-extraction/flat-roof-ventilation.html

you need professional planning advice, soo many variables some minor that can swing things. Will need to drop around £5k on them but if its gets you planning its cheap.

minor drying out, completely normal. Was the house built to your design or just bought it ?

if you need to 'move' your DPC level up to accommodate for level threshold for example then a tray 1 block up from DPC (with weeps at youf FFL) will allow you to breach the normal 150mm that has to be maintained below FFL. Just make sure the brickie adds a second 4" dpc 1 block up on the outer brickwork as well. Costs peanuts to do and gives really good flexibility for patio's, sloping approaches etc

If the adjoining walls aren't insulated to the same level not sure theres any point ? Same with triple glazed, save the money you will never get a return from it.

all the BCO I've ever had over last 10 years accept NHBC specs without question as the industry standard. maybe you know different... design stage ? not sure what you on about, in the real world BCO regs plans are produced and built too. Still waiting for you to provide evidence of where NHBC specs are wrong. Be good to advise them you know better than them.

EPS miles better than celotex for floor, yes you have a little more buildup to allow for but you can get 300mm of xps for same price as 100mm celotex.

this. you have a cold roof with no ventilation. will rot out in no time unless its addressed. Photo of the outside ? eaves and abutment vents, min 50mm gap maintained to allow an airflow etc The lantern upstand needs the same amount of U value insulation as the rest but doesn't look like they have been designed deep enough (they never are). Best stop and correct it now rather than have to rip it all out when the mould patches start appearing.

maybe. nothing guaranteed. until china stops with its coal powered fire stations we should be pausing everything anyway as its pointless.

err no. BCO applies NHBC rules, never seen them go against NHBC ever. Have you ?

more dodgy math. according to your chart 2021 price is $0.21/w. show me where I can buy a 400w panel for £68 ? lala land.

had exactly the same experience. Not found any of the firms who will go less than 12k for a 3k heatpump and 2k of cylinder and fittings. Ask them to breakdown the costs and they wont or you never hear back as its easier for them to scam the next unsuspecting punter. Going direct with city plumbing and plumber used before, may be a bit trial and error but at least not being ripped off by supposed 'MCS'. Solar was exactly the same when it came out, now there is no FIT and MCS its cheap.

i am but working round all its limitations to minimise the negatives as much as possible. looking to be 10 - 15x more expensive to install than a gas boiler.

its just not for a family with 3 teens. Not interested in micro showers and cold water!

just to correct you, 45 degree is allowed for by NHBC. Not sure why you getting so prim about it.

technically chambers are needed at changes in direction. could be installed correctly with a couple 45degree elbows on the in and out. main run is lower for a reason no sure what you dont understand about that.

10l flow is pathetic. may as well use a bucket and cloth! double that. very expensive to heat on demand in daytime so not a good idea, you want to aim for overnight heating at cheap rate and have enough hot water to last through the day at a realistic usage. No way would a single tank be enough for a family with teenagers. remember ASHP cant do heating and hot water at same time either. The only thing going for ASHP over a gas boiler is its cheaper to run, everything else is a negative.

be good in the summer though for AC mode.

be surprised if you dont get pushback from planning as its massive compared to either side, sticks out like a sore thumb.

may get away with it not blocking over time if a bath/shower/mwashing machine is connected but if just a bog the turds will drop in the middle back and wont get washed away. BCO should fail it....

30k! What's it made out of ?

concrete it in place. you can use bends to drop into it if you really have too. It's currently connected up incorrectly as well, the main flow needs to connect to the middle (middle is lower)not the sides, will then need a 45 i suspect to connect the outlet.

make room for at least 2 tanks unless you enjoy cold showers.

your pissing heat out the building somewhere. arent you curious where ?

Air test result ?