(1)
Except as provided in Sentence (2), glass shall be designed in conformance with Article 4.3.6.1.
(2)
Where the building has an essentially uniform distribution of paths for air leakage, including operable openings, but no large openings that would permit wind gusts to rapidly enter the building and the building is not in an exceptionally exposed location such as a hilltop, the maximum area of individual panes of glass for windows shall conform to
(a)
Tables 9.6.1.3.-A to 9.6.1.3.-C, where the building has a height from grade to the uppermost roof of 12 m or less, and is located in a built-up area, no less than 120 m away from the boundary between this area and open terrain, or
(b)
Tables 9.6.1.3.-D to 9.6.1.3.-F. (See Note A-9.6.1.3.(2))
(3)
The maximum area of individual panes of glass for doors shall conform to Table 9.6.1.3.-G.
Table 9.6.1.3.-A Maximum Glass Area for Windows in Areas for which the 1-in-50 Hourly Wind Pressure (HWP) is Less than 0.55 kPa(1)
Forming Part of Clause 9.6.1.3.(2)(a)
Notes to Table 9.6.1.3.-A:
(1) The maximum hourly wind pressure with one chance in fifty of being exceeded in any one year, as provided in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data.”
(2) Maximum glass area values apply to IG units of two identical lites (annealed, heat-strengthened or tempered) spaced at 12.7 mm.
Table 9.6.1.3.-B Maximum Glass Area for Windows in Areas for which the 1-in-50 Hourly Wind Pressure (HWP) is Less than 0.75 kPa(1)
Forming Part of Clause 9.6.1.3.(2)(a)
Notes to Table 9.6.1.3.-B:
(1) The maximum hourly wind pressure with one chance in fifty of being exceeded in any one year, as provided in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data.”
(2) Maximum glass area values apply to IG units of two identical lites (annealed, heat-strengthened or tempered) spaced at 12.7 mm.
Table 9.6.1.3.-C Maximum Glass Area for Windows in Areas for which the 1-in-50 Hourly Wind Pressure (HWP) is Less than 1.00 kPa(1)
Forming Part of Clause 9.6.1.3.(2)(a)
Notes to Table 9.6.1.3.-C:
(1) The maximum hourly wind pressure with one chance in fifty of being exceeded in any one year, as provided in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data.”
(2) Maximum glass area values apply to IG units of two identical lites (annealed, heat-strengthened or tempered) spaced at 12.7 mm.
Table 9.6.1.3.-D Maximum Glass Area for Windows in Areas for which the 1-in-50 Hourly Wind Pressure (HWP) is Less than 0.55 kPa – Open Terrain(1)
Forming Part of Clause 9.6.1.3.(2)(b)
Notes to Table 9.6.1.3.-D:
(1) The maximum hourly wind pressure with one chance in fifty of being exceeded in any one year, as provided in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data.”
(2) Maximum glass area values apply to IG units of two identical lites (annealed, heat-strengthened or tempered) spaced at 12.7 mm.
Table 9.6.1.3.-E Maximum Glass Area for Windows in Areas for which the 1-in-50 Hourly Wind Pressure (HWP) is Less than 0.75 kPa – Open Terrain(1)
Forming Part of Clause 9.6.1.3.(2)(b)
Notes to Table 9.6.1.3.-E:
(1) The maximum hourly wind pressure with one chance in fifty of being exceeded in any one year, as provided in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data.”
(2) Maximum glass area values apply to IG units of two identical lites (annealed, heat-strengthened or tempered) spaced at 12.7 mm.
Table 9.6.1.3.-F Maximum Glass Area for Windows in Areas for which the 1-in-50 Hourly Wind Pressure (HWP) is Less than 1.00 kPa – Open Terrain(1)
Forming Part of Clause 9.6.1.3.(2)(b)
Notes to Table 9.6.1.3.-F:
(1) The maximum hourly wind pressure with one chance in fifty of being exceeded in any one year, as provided in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data.”
(2) Maximum glass area values apply to IG units of two identical lites (annealed, heat-strengthened or tempered) spaced at 12.7 mm.
Table 9.6.1.3.-G Glass Area for Doors
Forming Part of Sentence 9.6.1.3.(3)
Notes to Table 9.6.1.3.-G:
(1) See Note A-Table 9.6.1.3.-G.
(2) Not generally available.