TABLE R301.2(1)
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CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
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Ground Snow Loado
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Wind Design
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Seismic Design Cate-goryg
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Subject To Damage From
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Winter Design Tempc
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Ice Barrier Under-lay-ment Re-quiredb
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Flood Haz-ardse
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Air Freez-ing Indexl
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Mean Annual Tempj
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Speedd
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Topo-graphic Effectsk
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Special Wind Regionl
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Wind-born Debris Zonem
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Weath-eringa
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Front Fine Depthb
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Ter-mitec
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15PSF
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115
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NO
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NO
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NO
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E
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SEV-ERE
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15
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MD-HVY
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90
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YES
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P
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<1500
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57.7
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MANUAL J DESIGN CRITERIAn
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Elevation
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Latitude
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Winter heating
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Summer cooling
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Attitude correction factor
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Indoor design temperature
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Design temperature cooling
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Heating temperature difference
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5151
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56o
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15
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95o
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1.00
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75o
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70c
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5o
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Cooling temperature difference
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Wind velocity heating
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Wind velocity cooling
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Coincident wet bulb
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Daily range
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Winter humidity
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Summer humidity
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20o
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+3o
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-2o
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76o
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M
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50%
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40%
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For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour
= 0.447 m/s
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a.
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Where weathering requires a higher strength concrete or grade
of masonry than necessary to satisfy the structural requirements of
this code, the frost line depth strength required for weathering shall
govern. The weathering column shall be filled in with the weathering
index, "negligible," "moderate" or "severe" for concrete as determined
from Figure R301.2(4). The grade of masonry units shall be determined
from ASTM C34, C55, C62, C73, C90, c129. C145, C216, or C652.
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b.
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Where the frost line depth requires deeper footings than indicated
in Figure R403.10, the frost line depth strength required for weathering
shall govern. The jurisdiction shall fill in the frost line depth
column with minimum depth of footing below finish grade.
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c.
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The jurisdiction shall fill in this part of the table to indicate
the need for protection depending on whether there has been a history
of local subterranean termite damage.
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d.
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The jurisdiction shall fill in this part of the table with the
wind speed from the basic wind speed map [Figure R301.2(5)A]. Wind
exposure category shall be determined on a site-specific basis in
accordance with Section R301.2.1.4.
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e.
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The outdoor design dry-bulb temperature shall be selected from
the columns of 97 1/2 - percent values for winter from Appendix
D of the International Plumbing Code. Deviations from the Appendix
D temperatures shall be permitted to reflect local climates or local
weather experience as determined by the building official. [Also see
Figure R301.2(1).]
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f.
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The jurisdiction shall fill in this part of the table with the
seismic design category determined from Section R301.2.2.1.
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g.
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The jurisdiction shall fill in this part of the table with (a)
the date of the jurisdiction's entry into the Flood Insurance Program
(date of adoption of the first code or ordinance for management of
flood hazard areas), (b) the date(s) of the Flood Insurance Study
and (c) the panel numbers and dates of the currently effective FIRMs
and FBFMs or other flood hazard map adopted by the authority having
jurisdiction, as amended.
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h.
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In accordance with Sections R905.1.2, R905.5.1.1, R905.6.1.1,
R905.7.3.1 and R905.8.1.1, where there has been a history of local
damage from the effects of ice damming, the jurisdiction shall fill
in the part for the table with "YES." Otherwise, the jurisdiction
shall fill in the part for the table with "NO."
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i.
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The jurisdiction shall fill in the part of the table with 100-year
return period air freezing index (BF-days) from Figure R403.3(2) or
from the 100-year (ninety-nine percent (99%)) value on the National
Climatic Data
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Center data table "Air Freezing Index-USA Method (Base 32°
F.)."
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j.
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The jurisdiction shall fill in this part of the table with the
mean annual temperature from the National Climatic Data Center data
table "Air Freezing Index- USA Method (Base thirty-two degrees Fahrenheit
(32° F.))."
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k.
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In accordance with Section R301.2.1.5, where there is local
historical data documenting structural damage to buildings due to
topographic wind speed-up effects, the jurisdiction shall fill in
this part of the requirements. Otherwise, the jurisdiction shall indicate
"NO" in this part of the table.
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l.
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In accordance with Section R301.2(5)A, where there are local
historical data documenting unusual wind conditions, the jurisdiction
shall fill in this part of the table with "YES" and identify any specific
requirements. Otherwise, the jurisdiction shall indicate "NO" in this
part of the table.
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m.
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In accordance with Section R301.2.1.2 the jurisdiction shall
indicate the wind-borne debris wind zone(s). Otherwise, the jurisdiction
shall indicate "NO" in this part of the table.
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n.
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The jurisdiction shall fill in these sections of the table to
establish the design criteria using Table 1a or lb from ACCA Manual
J or established criteria determined by the jurisdiction.
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o.
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The jurisdiction shall fill in this Section of the table using
the Ground Snow Loads in Figure R301.2(6).
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p.
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See Floodplain Manager of Jurisdiction.
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