Local climatic and geographic design criteria for Table R301.2(1) shall be as follows:
TABLE R301.2(1)
CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
GROUND SNOW LOADo: 20 PSF.
Design roof load shall not be less than a uniform snow load of 25 psf.
WIND DESIGN SPEEDd (mph): 90
Wind speed from the basic wind speed map [Figure R301.2(4)A]. Wind exposure category shall be determined in accordance with Section R301.2.1.4
WIND DESIGN TOPOGRAPHIC EFFECTSk: NO
In accordance with Section R301.2.1.5
SEISMIC DESIGN CATEGORYf: C
In accordance with Section R301.2.2.1
WEATHERINGa: Severe
As determined from the Weathering Probability Map [Figure R301.2(3)]. The grade of masonry units shall be determined from ASTM C34, C55, C62, C73, C90, C129, C145, C216 or C652.
FROST LINE DEPTHb: 24 inches
TERMITEc: Slight to Moderate
Based on history of local subterranean termite damage.
WINTER DESIGN TEMPe: 10 degrees F
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 or as determined by the Building Official.
ICE BARRIER UNDER LAYMENT REQUIREDh: NO
In accordance with Sections R905.2.7.1, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1, where there has been a history of local damage from the effects of ice damming.
FLOOD HAZARDSg: First Floodplain Ordinance for the City of Boise City became effective December 12, 1983. Flood Insurance Study (FIS) June 19, 2020. Panel numbers (all with a date of June 19, 2020) are: 0160 J, 0161 J, 0162 J, 0166 J, 0167 J, 0169 J, 0178 J, 0186 J, 0187 J, 0188 J, 0189 J, 0193 J, 0254 J, 0258 J, 0259 J, 0265 J, 0267 J, 0270 J, 0276 J, 0277 J, 0281 J, 0282 J, 0283 J, 0284 J, 0286 J, 0287 J, 0291 J, 0295 J, 0305 J, 0315 J. The adopted flood hazard map and supporting data are hereby adopted by reference and declared to be part of this section.
AIR FREEZING INDEXi: 894
Based on the 100-year return period air freezing index (BF-days) from Figure R403.3(2) or from the 100-year (99%) value on the National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32° Fahrenheit)" at www.ncdc.noaa.gov/fpsf.html.
MEAN ANNUAL TEMPj: 51.1 degrees F
Based on the mean annual temperature from the National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32°F)" at www.ncdc.noaa.gov/fpsf.html.
MANUAL J DESIGN CRITERIAn:
Elevation: 2867 Latitude: 44 deg. N.
Winter heating: 11 deg. Summer cooling: 95 deg.
Altitude correction factor: .98 Indoor design temperature: Heating-70 deg.
Design temperature cooling: 75 deg. Heating temperature difference: 60 deg.
Cooling temperature difference: 20 deg. Wind velocity heating: 15.0
Wind velocity cooling: 7.5 Coincident wet bulb: 63 deg.
Daily range: High Winter humidity: 50%
Summer humidity: 50%
Footnotes published underneath Table R301.2(1) in the code are applicable.
(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)