How much smaller should the stained glass panel be in order to fit a window? 1/8 of an inch on each side?
Yes, 1/8 of an inch smaller each side is perfect. That allows for the silicon or putty and means that you don’t damage the window trying to get it in.
It’s called the ‘Fitting Size’.
I have a page all about measuring, if you have any more questions you might find the answer here:
Good luck, and I hope it fits. It’s always a bit of a ‘heart in the mouth’ moment…
formula for using 1/2″ U Zinc
Using 1/2″ U zinc:
The bite on each size of the 1/2″ U zinc is 3/16″.
Total bite for both sizes is 3/8″
Zinc is 1/2″ + 1/2″ =1″ – 3/8″ = 5/8″
Reduce the pattern size by 5/8″ overall.
If the pattern is computer drawn and printed, cut down the middle of the printed line and you’ll be fine.
If the pattern is hand drawn, then take the additional 1/8″ and use shims to position the finished window just to be safe.
Milly says: Thanks for taking the time to post, that’s really helpful.