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Slight dredge but just popping back to say thanks for your input.
In the end we have sacked the builders who were sub contracted by the window firm, and the window firm are sending their in house guys to sort everything out on Friday. With any luck it will be done by the weekend.
On track vs circular - I have the macallister (or however you spell it) with makita guide rails for long cuts, and an upgraded blade. It is only a 48t erbauer blade (iirc) but worked very well for cutting birch ply kitchen doors etc.
ILb
BrickMan
Could do something like cut + lay a piece of stainless or polished alloy sheet over it? Or go mid century style with some formica sheet or lino cut to perfection and bonded down onto it?
Your Bifold looks a bit gappy for sure, never fitted one but I would treat it like a window or regular patio doors..... Concrete, brick or timber for it to sit on, a DPC sheet, ideally continuous and extending into either side of the wall so that it ties in with any other DPC or membrane. Ideally it should sit on that super neat, inevitably going to need some kind of sealant, but given its a weighty beast and likely folk are going to stand on the bifolds' threshold and it'll maybe sag over time, you want whatever sealant or gap fill to be strong and not shrink or sag itself.
As I say, never fitted one myself but would assume you'd get the lower seal/ contact patchs pretty damn bang on before bothering tieing it into the building anywhere else, not come back on the last day and bung a few tubes of sealant in there. If there are two pieces of DPC, should be jointed/overlapped by x amount and then taped together with that magic bitumen tape.