Posted by Vic on March 05, 2003 at 08:00:34:
In Reply to: Air Space Between Glass & Window posted by Kristina on March 04, 2003 at 20:05:31:
: I have recently read that the closer the protective exterior sheet of glass is to the stained glass window the better - for prevention of heat pressures & subsequent bowing.
: I am doing numerous copper foiled windows (about 28" square) for a church installation & plan to put double strength glass on the outside, up against the zinc frame of the stained glass panel. Then silicon caulk around the glass (between it & the exterior trim) for weather tight installation in an existing aluminum window frame.
: Do you see any problems with this approach?
: Thank you for your wonderful site & the resource you are.
I don't quite follow what you are doing. Are you installing the stained glass in the window frame, then gluing the clear glass to the stained glass? If so. 1- double strenght window class will only protect the stained glass from the weather. If someone throws a rock or ball hard enough the clear glass will break and maybe the stained glass. To protect the stained glass use laminated or tempered glass.
2- Where did you read about placeing the two glazings together? Most of the best worldwide restoration experts think that you need a space between the two glazings (1/2" to 1") and you should vent the air space to the interior of the building. Heat is only one problem the other is mosture build up.
3- You can do alot to prevent bowing with proper design and rebar.