Dave Jones

good luck ever getting close to having a builder complete that. You need a rocket scientist ! You have 6 different types of membranes in that 'detail' Have to keep it much simpler to stand a chance of getting it done correctly.

got it so steeper means less yield ? Could allways hang a bunch on some fencing ?

dont be silly. its a bodge, marmox are designed to eliminate this cold bridge. Nothing stopping using blocks as every house has done for years it will save a few pennies but its wrong and is still a cold bridge.

30 - 35 is optimal pitch for solar we were told ? VERY optimistic expecting to build for less than £3km2 unless all your trades are free and your fees are minimal ? If your not borrowing to build go for it, if you need finance the bank will require real world costings to lend against i.e. £3-5k m2. Just a heads up.

until the aircrete gets slightly damp or even worse wet then they are horriffic.

ask bpc to design you a solution, they dont charge for this.

yeah thats a take down. Why didnt they just lay some damp across the top to protect it ? cowboys.

put a long level on it and take photo. sandstone is cheap for a reason! As its riven it's never flat so water does collect on some slabs. Over very small distances you would need a large fall to clear it which looks crap and your table wont be level etc. its a balance.

dont really have anything to compare with but it was a doddle to install, the controller is not 'that' user friendly but they are all like it. touch wood no issues as yet.

the flashing is really a soaker so should be below the tiles and extend a min on 150 under them.

the big drawback is loss of heat though with this. fresh air is drawn in at outside temp by trickle vents leading to high moisture issues in winter.

not heard of cascade system, could be a cost effective alternative only having to duct the extract rooms.

when you say 300m is that the slab area ? Shame your pipe spacing is for old gas boiler, 100mm is much better. id agree on being oversized, rule of thumb is 30w per m2 on new regs. My aquera when we first ran it in march which was a cold snap, below zero. We had no loft insulation and all the downlighter holes were open upstairs and was getting a cop average of 8.6. flow temp of 25 and this was too hot.

extension regs are a lot softer than new build. I'd still go for 150cav (if it works into existing walls) and 150 dritherm batts.

doesnt work like that.

not really, aircrete are massively poorer than marmox.

if they are structural built off the block and beam yes marmox them for sure.

its width of upstand not height. can you get 100mm celotex +plasterboard on the upstands ?

back to the start. Was the zinc contractor aware of the velux detail hinges when they originally quoted and agreed to the job ? Even if they werent it seems completely unreasonable not to offer a day on site paid with whoever is fitting the velux to get it sorted. You have the ace card as youve not paid him. I'd have one more try to get him onsite if refuses contact his warranty provider and ask for a recomendation of another firm to do the same. Let him know you will be doing this and deducting their costs from his bill. As as side you dont look to have wide enough upstands to get 100mm of insulation into, although the pics could be deceiving.

as seems to be routine with MCS salesman cart before the horse. Before you even think about ASHP, get heat loss calcs done. This will give you the knowledge if its even viable, if you can upgrade some building elements etc It's not hard to do if you take your time or pay someone to do it for you. Only once you have this can you make an informed decision and look at costs.

get some tile and halfs. much easier.

what do you mean by internal walls, the inside skin or walls built inside the thermal envelope ?

there needs to be a goal for price parity between gas and electric. The market would then take care of it. 1 kwh gas = 6p 1 kwh elec = 23p

no its a sealed unit that you feed from the top. They also do chiller drawers exactly the same design. Brilliant warranty from them as well.