Oz07

It's just because the valleys are on a lower pitch so the plumb cut is higher on the main plane of the roof.

Much less than masonry in the hole then? What is op worried about? Position in cavity?

32mm is ok round here although the depth you've got isn't good. Are you thinking of a new trench through the garage slab or just a hole to bring it up? Any sketch?

Welcome... If doing ufh in slab, with the ufh stapled to insulation and no mesh, is this ok with concrete and cutting crack control joints in the top 3rd? Would the pipes likely accommodate any movement the concrete could make

That foam will cover the gap. I got a good air score last time and didn't worry too much about this junction. Think I just used the foam as above. I would guess its one of the less crucial airtightness details on traditional construction

Could illbruck foam the gap once boarded if you leave the boards an inch or so off floor gives a good gap to make a nice bead. Cut back flush with board once gone off

Excluding the fact op mentions block of flats do people here really get an SE to design how their windows will be supported in the opening?! For instance if building bog standard building regs you just overhang the cavity by minimum 30mm for part l regs. Nobody worries about whether the masonry will support the glazing. As @FuerteStu says the weight of brickwork in the same opening would be getting on for 250kg plus mortar just on the external skin.

Someone on here recently did a blog post with their place getting sprayed and back rolled i asked a question in the blog. I'd be paying someone I've tried it before with a cheap sprayer, had to pole sand the lot. As it happens a painter I know on site prefers to mist coat them before the skim has fully dried. Says they drink the paint otherwise too much topping up the roller. Can't really see a problem with this for a mist coat watered down anyway. He gets 150 a plot for mist coat whether it be 2 bed or 4 bed. He can finish them by 1pm and get back to the plot he's in. Has a neat corner roller for internals

Is it single storey? Even if its 2 storey if existing is 50mm cavity you might be overthinking this. It's not like the existing building is at passive levels of insulation. It's likely to not be the only cold bridge in the house whats the existing floor insulation? A 4" break should be fine

When does this come into effect?

Search @nodposts with pcc mentioned. On his most recent build I believe he's used a "guarantee " company who effectively just issue you a pcc i think. Not sure what happens between year 6 and 10 maybe it is a more comprehensive scheme than the architect I've used.

I use architect who issues pcc

🤣 I see you've been full black pilled now! I'm not sure whether your plan will work but gotta try I suppose. For anyone digging this thread up in future just do what I did. Fence it off and keep them out.

Insurer - how much in % of you roof is flat You - 100 Insurer - 🤑

"That valleys gonna give me problems down the line"?