Last windows I fitted had all mitred beading - the only trick was to get top
bottom in first, then the sides.
New windows, every bead is mitred at one end and square cut at the other.
Putting them in looks a bit like the problem where you fold the 4 flaps on a the top of a box so they are all interlocked. In other words, every bead has a neighbour under it whilst itself tucks under the other neighbour.
Fit the shortest (rather than top/bottom) first, then spring the longer pieces in by bending. I usually find reading the instructions that come with the windows helps as well.
I removed 2 old windows, the roofers removed the other 2. They have done little lead cill trays for all 4 and I have mounted the frames - by which time it was 4pm. Luckily I had the foresight to buy a big sheet of 150 micron sheeting just for the occasion of covering unglazed windows :)
Typically, as these things go, I enquired of the roofers how they would like the frames mounted (positioning forward/backwards). They said "frames
18-24mm pround of the outside edge of the timber framed wall would be good, so the verge between the vertical tiles and the frame in minimised".
This led to my pre-drilled holes and thus screws being within 10-15mm of the outside edge of the timbers. I am not 100% happy about that - bit close IMO, so I will add another 4 screws per window (2 each side) set and angled back to get a better bearing, because I am Mr Over-Engineering.
Could do with a little extra stiffness anyway (pre foaming, which will help more) as I have been "forbidden" from sticking screws down through the lead under-cill tray. This is not unreasonable as there was some rot there due to the previous tray not being done properly. Only 1.2m wide frames and they are full of steel so should be OK.
Anyway, should be able to wrap this up tomorrow. 12 DG panels to glaze in.
I did ring windowsanddoors.co.uk about the beading design, but they were a bit unhelpful. Trial and error I suppose.
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