Protective Glass for Stained Glass Windows: Is It Worth It?
/Quick answer: Protective glass for stained glass windows is an exterior layer of clear glass or glazing installed outside the stained glass to shield it from hail, weather and impact. It can be worth it on exposed windows, but it needs proper ventilation so heat and moisture don't get trapped. Steve Downing of The Glass Master in Thornton, CO, can talk through whether it makes sense for your window anywhere in the Denver metro; call (303) 457-1886.
What Is Protective Glass for Stained Glass Windows?
Protective glazing, sometimes called stained glass storm glazing, is a separate pane of exterior glass over a stained glass window. The stained glass stays inside, and the outer layer takes the weather.
The Pros
- Hail and impact protection: the outer layer takes hits that might otherwise crack the art glass.
- Weather protection: less direct exposure to rain, snow and sun.
- Fewer drafts around older windows.
- Added security for ground-floor windows.
The Cons and Cautions
Trapped Heat and Moisture
Without ventilation, the space between the layers can trap heat and condensation, which can stress the lead and frame over time.
Changes to the Outside Look
Exterior glass over stained glass can reflect light and change how the window looks from the street.
It Doesn't Fix Existing Problems
If the stained glass is bowing or has loose pieces, those should be repaired before it's covered.
Why Ventilation Matters
A small gap with venting lets air move between the layers so heat and moisture can escape. How that's done depends on the window and frame, so it's worth discussing for your specific opening.
When Protective Glass Makes the Most Sense
Windows on exposed sides of the house, ground-floor windows and older pieces worth preserving are the most common candidates. For door glass, triple-glazed inserts already sandwich decorative glass between protective layers; see the door conversion page.
Frequently Asked Questions
Does protective glass hurt stained glass?
Not when it's installed with proper ventilation. Poorly vented glazing can trap heat and moisture.
Will protective glass stop hail damage?
It adds an outer layer that takes the impact, which reduces the risk to the stained glass behind it, though no glass is hail-proof.
Should I repair my stained glass before adding protective glass?
Yes. Any bowing, loose pieces or cracks should be addressed first so they aren't sealed in.
Protect Your Stained Glass
About The Glass Master: The Glass Master is a custom stained glass studio owned by Steve Downing in Thornton, Colorado, serving Denver and the north metro, including Westminster, Northglenn, Broomfield, Arvada and Brighton. Phone: (303) 457-1886.
Call Steve at (303) 457-1886, 7am to 5pm daily, or send a message. Browse the windows gallery to see finished work.
