LiamJones

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.

Have a look at ubakus, you can model it all out and have a look at u values, interstitial condensation risks and decrement/phase delay. Im in a similar situation to you. Ripped suspended floor out, added 200mm PIR and 100mm concrete. Blocked up air bricks. Current cavity filled with loose EPS beads, will top up with glued EPS beads. Adding 100mm EPS EWI and render.

We went self compacting concrete, no power floating required. £150/m3 for the concrete (TopFlow). £1100 for the install. 100m2 @ 100mm = £2600 ex vat installed.

I have a steal ridge beam, with timber plate bolted above ready for rafters to be birthmouthed into. Should I have a timber ridge board between opposing rafters, or just have them connect into each other? No ridge board is more thermally efficient, less cold bridge, can run insulation all the way through. Ventilation can run eave to eave over the ridge. The reasons I can see to install a ridge board, 1. Don’t need to have rafters symmetrical either side of ridge. 2. Easier to fix into when it comes to ridge tiles.

I’ve just been quoted £1200 solicitors fees. I was thinking £200-300! What are they even doing for that? A couple of forms?! any recommendations for a more reasonable price?

sure, I’ll try and get something written up. But in short. For UKPN, you log on to smart connect (create an account) then follow the form. The most complex part is the line diagram, but that’s way more simple than it sounds, i just did a diagram with the supply head, consumer unit and inverter. Then a line between them. They only care about the AC side.

8kw via g99. Did it myself all went smoothly. Approved after about 3 weeks. UKPN.

I have a grid connection and opted to self install solar because MCS + export makes no financial sense. Install only what you need. Even the octopus non MCS export doesn’t make sense to me with the fees involved.

I’m interested in this too

Density is a variable of decrement delay. A decrement delay of 12hours will average out the highs of day and lows of night for a more stable internal temperature. I don’t think your experiment factors that in? I’m not suggesting chucking more density in to solve the problem, although you could. A more sensible approach would be to consider decrement delay when choosing the insulation material by having a play on ubakus.

Roofs already off. We’ve pretty much started again

I’m not the original poster, but in a similar situation, I have ended up getting a structural engineer involved for £1k to design be a steel ridge beam £2k for the rafter to be hung on. Get full height ceiling upstairs and velux can go wherever we want. Attic trusses were more expensive, less flexible but would have been quicker.

for bits i could ditch it, but the a142 is also providing structural properties over old foundations to help with differential movement. I also like that on mesh (on chairs), it can sit half way up the slab. should be more efficient? by how much i dont know. I think ill probably stick with the mesh, but thanks for the alternative.