LiamJones

60m2 slab from the 70s is gunna be no thicker than 100mm. That’s 6m3 of concrete to crush. 12 ton maybe. £33ex a ton for type 1. £400. By the time you’ve hired a crusher, you’ll be no better off. £150 for a grab if you need to get rid of it. I’d just buy fresh type 1 in next time for sure

Yes, but it’s far harder to level and compact than type 1. I did the same, but if I did it again I’d get rid of the concrete or use it on the drive and get fresh type 1 for slab

For the OP. GSE trays with the Velux ODL kits for a seamless array. Not finished yet, trays/solar will go round all the velux.

@Nick Laslett I see you’ve ran the gse trays up to the eaves. What flashing/tray did you use to bridge this? Standard eaves trays are too small for the gap specified in the gse manual. 330mm. Considering using lead now. Or custom Ali trays

How long is semi dry?

Have you managed to get installed yet? Im getting confused about the direct to eaves connection detail. they seem to want a 380mm eaves tray, but all standard trays are no more than 200mm. also a bit confused on how to get the ventilation under the panels, where would i put an "over fascia vent", between the two eaves trays? it all starts to look a bit messy if you kick up the last tile.

Any tips for the eaves detail on this build up, do i need ventilation between breather membrane and the tiles (e.g, through the 50mm batten/counter batten void)? i've seen eaves trays with built in ventilation, but to the underside of them, whereas i want the ventilation over the top of the tray?

Hi, welcome to the forum! I can’t answer your original questions, but can provide some observation of your designs. open plan kitchen onto stairs complicates building regs means of fire escape. Certainly the back? Bedroom, the one without a window, will not meet regs. Possibly only the rooms with sliders/bifolds will meet the requirement. best of luck with your project! my one piece of advice is download Sketchup and have a play with design yourself, become familiar with he regs. you’ll learn loads and begin to think further ahead. Every job impacts a job a couple of steps down the line! If you trust trades to plan, they’ll only plan their step.

The warmcel installer said he'd be happy to core through 50mm PIR between every rafter (600c). I do like the idea of PIR here to bring the u val down by 0.06 Rafters are 8x2, dont want to lose too much below as it'll be room in roof. above, less limited, although i dont like the idea of a warm roof. target u val, dont really have one, as good as i can get, whilst still having good decrement delay, good accoustically and good in the real world (e.g not PIR between) Yeah, really want to avoid that! £2313 for 120m2 @ 200mm, that's ex vat, but it should be 0 rated.

6 months later, i'm almost ready to start doing this! Thanks for pushing me towards cellulose @Iceverge. Got a quote back from warmcel cheaper than the PIR. So i'm going this route. I understand i need something to hold it in place above and below. so i'm thinking the following roof buildup. What sort of vapur barrier to i need above? any recommendations on a particular one. How about vapour control below, i understand the foli faced PIR, taped, to achieve all i need in terms of vapour and air tightness? Cheers, Liam

UKPN refuse to install new/moved supplies internally now. Either an external meter box or a kiosk are the options. Your DNO may differ

Yep, the export limit is based on inverter size.

Have a look at spider cranes. I just paid £350 for half a days lifting a 11m ridge beam, 2 posts to sit it on and a ground floor steel. 5 pieces in total. Don’t mess around trying to do it by hand, your brickies are far slower, so will work out way more expensive and more risky.

There was no charge for a g99 with my DNO (UKPN). Did it myself via the smart connect portal, got approval for 8kW.

Need sizes of the items to better help.