I am fitting a new external door this weekend and need to buy the glass in
advance. I have measured the glass panels - how much is recommended that I
knock off the exact measurements to give the glass cutters to ensure a good
fit? (I thought 2mm?).
Depends on the size of the rebates - if half inch that gives one inch
overall spare so the glass size could be as measured dead, less say
1/4 inch overall. Check the diagonals - if not square then you might
need more allowance.
Its better to have a loosish fit otherwise shrinkage or other movement
might stress the glass.
You also need toughened or laminated glass for a door.
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