How To Measure Glass!
In the glass trade we use the following terminology and criteria for measuring glass.
The first being a TIGHT SIZE this is obtained by measuring from wood to wood on your window or door frame.
The second being a GLAZING SIZE which you obtain by knocking off 4mm to 6mm tolerance from the tight size.
We recommend allowing 4mm tolerance on small squares up to 250mmx300mm, any sizes above this we would allow 5mm-6mm tolerance.
Please note these guides are based on standard 12mm rebates/beading! If your rebates/beading are smaller you will have to make special tolerances.
When ordering the glass you must state the GLAZING SIZE on your order.