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AAMA Guidelines for Overhead Glazing |
Designation in
inches |
Glass
Type |
Outboard
Lite in
inches |
Air
Space in
inches |
Inboard Construction
Glass-PVB-Glass in
inches |
Maximum
Size
sq. ft. |
Weight
lbs/ft2
|
| 1/4 | Annealed | – | – | 1/8-0.030-1/8 | 12 | 3.42 |
| 3/8 | Annealed | – | – | 3/16-0.030-3/16 | 18 | 5.05 |
| 1/2 | Annealed | – | – | 1/4-0.030-1/4 | 24 | 6.67 |
| |
| 5/16 | Heat-strengthened | – | – | 1/8-0.060-1/8 | 25 | 3.58 |
| 7/16 | Heat-strengthened | – | – | 3/16-0.060-3/16 | 40 | 5.21 |
| 9/16(1) | Heat-strengthened | – | – | 1/4-0.060-1/4 | 40 | 6.83 |
| 13/16(1) | Heat-strengthened | – | – | 3/8–0.060–3/8 | 40 | 10.09 |
| 1 1/16(1) | Heat-strengthened | – | – | 1/2–0.060–1/2 | 40 | 13.33 |
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| 7/8 | Annealed | 1/8 | 1/2 | 1/8-0.030-1/8 | 12 | 5.05 |
| 1 1/16 | Annealed | 3/16 | 1/2 | 3/16-0.030-3/16 | 18 | 6.67 |
| 1 1/4 | Annealed | 1/4 | 1/2 | 1/4-0.030-1/4 | 24 | 8.29 |
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| 15/16 | Heat-strengthened | 1/8 | 1/2 | 1/8-0.060-1/8 | 25 | 5.21 |
| 1 1/8 | Heat-strengthened | 3/16 | 1/2 | 3/16-0.060-3/16 | 40 | 6.83 |
| 1 5/16 | Heat-strengthened | 1/4 | 1/2 | 1/4-0.060-1/4 | 40 | 8.45 |
These are conservative designs assuming the glass is horizontal with maximum snow load.
Detailed engineering design particularly on sloped glazing can often increase the maximum allowable size.
(1) These products are recommended for point-supported canopies.
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