In article ,
"David Harper" wrote:

You might be better off having a local glass company make an insulated glass
unit .

3/16" or 1/4" tempered glass ( outside )
1/4" air space
stained glass
1/4" air space
3/16" or 1/4" tempered glass ( outside )


Then this can be glazed in the window custom frame

I'm not certain about this, but you might have a problem with heat
affecting the stained glass if it's installed in a sealed sandwich. Too
much heat can soften the lead solder joints and cause the stained glass
panel to sag.

--
Owen Lowe and his Fly-by-Night Copper Company
____

"Sure we'll have fascism in America, but it'll come disguised
as 100% Americanism." -- Huey P. Long