Joiner
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They'll have been fited by now, but...
CWatters is right about the drainage. Unit manufacturers will not honour the guarantee if packers haven't been used, although if they don't come on site I don't see how they can know anyway! Use a smear of sealant to hold them in place.
It's good practice to heel and toe units in any hinged component, regardless of size, whether upvc or wood.
All the upvc fitters I know now use the conscrews (screwing directly into a pilot hole in the brickwork/masonry), and I now use them for fitting all my timber windows and doors because they give such a positive fastening. Because they give such a good secure fastening packers are essential to prevent distorting the frame.
(Incidentally, conscrews are perfect for securing joints in timber where you're screwing into the cut end of a section, when normal screws would tend to pull along the grain and fail conscrews hold because they cut their own "thread".)
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