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Stained Glass/Venting double glazed protection


We previously had some of our church windows restored & covered with double glazing. The company we used removed each window and somehow fused the stained glass & thermal protection into a new aluminum frame with no ventilation in between. Now we need to protect some more windows from possible vandalism. We asked other companies to inspect the windows & give us a quote. None of them like the previous double glazed method used. They all use a single glaze protection with adequate external ventilation. The original company said there was no need for ventilation as there would be no heat gain or condensation from the thermopane protection.
Now we are worried that the protected windows may be in danger of damage & don't want to go ahead with that company until we know it's a safe method of protection. Help!

Hello Joanna,

Please accept my apology for the delay in answering your question, I have been working out of town.

I understand your concern. There are a few things I will need to know prior to providing an answer.
Are the stained glass panels inside of the thermal pane (clear glass on both interior and exterior)?
Are the new frames thermally broken?
Do you have a diagram or detail photo of the frame (whats between the stained glass and the thermal unit)?

It might be easiest to e-mail me directly at, so if necessary we can create a dialog of questions and answers.

My last question is why do you feel you need protective glazing on your stained glass windows? Have you had problems with vandalism? In the past 28 years, we have worked on hundreds of Church windows to varying degrees. Very few have had damage from vandalism.

I look forward to hearing from you.


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Valerie McCartney


Visit our web site at I can answer questions about restoration and repair of stained glass windows and their surrounds. I can, also, answer technical questions regarding matching old glass, glass painting (kiln-fired), waterproofing panels (cementing), re-inforcing, removal, and installation. I can not answer questions on glass casting, Dalle de Verre, or glass blowing.


Past/Present partial client list
Aboite Baptist Church, Ft. Wayne, IN; Immaculate Conception Church, Three Rivers, MI; St. Monica Church, Kalamazoo, MI; St. Charles Catholic Church, Coldwater, MI; St. Clair Catholic Church, Centreville, MI; St. Mary's Church, West Phalia, MI; Pleasant View Church of Christ, Angola, IN; St. Paul United Church of Christ, LaPorte, IN; First Congregational United Church of Christ, Olivet College, Olivet, MI; First Congregational Church United Church of Christ, Kalamazoo, MI; Trinity Lutheran Church, Culver, IN; St. Paul's Lutheran Church, Breman, IN; Grace Lutheran Church, Germfaske, MI; St. Michael's Lutheran Church, Rogers City, MI; United Methodist Church, Bellevue, MI; Augusta Fellowship United Methodist Church, Augusta, MI; United Methodist Church, Galena, IL; Metropolitan United Methodist Church, Detroit, MI; University United Methodist Church, Lansing, MI; Believer's Bible Fellowship Church, Churubusco, IN; St. Elias Eastern Orthodox Church, Battle Creek, MI; First Presbyterian Church, Allegan, MI; First Reformed Church, Grand Haven, MI; Bellmor House, Grosse Pointe, MI; Milwood Middle School, Kalamazoo, MI;

Experience in the area
I have owned and operated Full Spectrum Stained Glass, Inc. since 1988. (

The Stained Glass Association of America, The American Glass Guild, National Trust for Historic Preservation, Better Business Bureau of Western Michigan

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