The provisions of Section 2407 of IBC are adopted by reference with the following modifications:
1. Revise Section 2407.1 to read:
"2407.1 Materials.
Glass used in a guard or to support a handrail shall be laminated glass constructed of fully tempered or heat- strengthened glass and shall comply with Category II or CPSC 16 CFR Part 1201 or Class A of ANSI Z97.1. Glazing in guard in-fill panels shall be of a recognized safety glazing material that conforms to the provisions of Section 2406.1.1. For all glazing types, the minimum nominal thickness shall be 1/4 inch (6.4 mm).
Exception: Single fully tempered glass complying with Category II of CPSC 16 CFR Part 1201 or Class A of ANSI Z97.1 shall be permitted to be used in guards where there is no walking surface beneath them or the walking surface is permanently protected from the risk of falling glass."
2. Revise Section 2407.1.1 to read:
"2407.1.1 Loads.
The panels and their support system shall be designed to withstand the loads specified in Section 1607.8. Glass guard elements shall be designed using a factor of safety of four in combination with the mean modulus of rupture for the type of glass provided in Table 2407.1.1.
TABLE 2407.1.1
MODULUS OF RUPTURE
MODULUS OF RUPTURE
TYPE OF GLASS |
MEAN MODULUS OF RUPTURE
|
Annealed glass | 6,000 psi |
Heat-strengthened glass | 12,000 psi |
Fully temepered glass | 24,000 psi |
For SI: 1 pound per square inch = 6894.75 N/m
2."
3. Revise Section 2407.1.2 to read:
"2407.1.2 Structural glass baluster panels.
Guards with structural glass baluster panels shall be installed with an attached top rail or handrail. The top rail or handrail shall be supported by not fewer than three glass baluster panels, or shall be otherwise supported to remain in place should one glass baluster panel fail.
Exception: An attached top rail or handrail is not required where the glass baluster panels are laminated glass with two or more glass plies of equal thickness and of the same glass type. The panels shall be tested to remain in place as a barrier following impact or glass breakage in accordance with ASTM E2353."
4. Revise Section 2407.1.3 to read:
"2407.1.3 Parking garages.
Glazing materials shall not be installed in guards in parking garages except for pedestrian areas not exposed to impact from vehicles."
5. Delete Section 2407.1.4 and its subsections.