Bet they didn't pack the frames correctly plus get them truly square and level......yet to see a window fitter do this, they seem to lack the basic understanding with a window as to where the weight transfer is.
Because like anyone paid by piecework, they have figured out how to do it just good enough to keep the boss and customer happy.
And I'd be more concerned about each stay being attached with 3(4 on a big one) self-tapping screws into uPVC than a theoretical weight transfer.
Gav, face drained means that any water that makes it past the gaskets around the sealed-units drains out of slots cut in the lower front face of the door leaf(the bit you open 
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Stainless steel self-cutting screws are used primarily as the majority of "decent" Pvcu windows are reinforced with galvanised steel or aluminium
That will depend on the maunfacturer, as I got several bollockings for buying stainless screws to replace steel ones. Apparently, it messed up their figures, and I was the only one who thought it acceptable to send a service-engineer every couple of years to replace rusty screws on sea facing windows.
It's been a long time, but these things had a grip length of about 6mm, so weren't long enough to usefully penetrate the reinforcement.
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Topic: I like it when workmen do it right (Read 3933 times)