Design Criteria

These are only general criteria for Grand County. Specific locations or a change in elevation can cause variations in these criteria.  See the table below for more information.

Ground Snow Load 
WIND SPEED (MPH)
Seismic Design Category SUBJECT TO DAMAGE FROM Ice Barrier Underlayment Required Flood Hazard Air Freezing IndexMean Annual Temp 
Speed (mph)
Topographic Effects
Special Wind Region
Wind-born Debris Zone
WeatheringFrost line depthTermite



21105NONONOB
20"YES8
85056.6
MANUAL J DESIGN CRITERIA
Elevation
Altitude Correction Factor 
Coincident Wet-bulb 
Indoor Winter Design Dry-bulb Temperature 
Indoor Winter Design Dry-bulb Temperature
Outdoor Winter Design Dry-blub Temperature 
Heating Temperature Difference
Latitude
Daily Range
Indoor Summer Design Relative Humidity
Summer Design Gains
Indoor Summer Design Dry-bulb Temperature 
Outdoor Summer Design Dry-blub Temperature
Cooling Temperature Difference


Ground Snow Load = 21 psf     Wind Speed=115 mph     Frost Depth=20"     Winter Design Temp=8º     

Flood Hazards=4/2/2020     Air Freezing Index=850     Mean Annual Temp=56.6º

Utah State Construction Code


For more information regarding Utah State Construction Code

  

Grand County Design Criteria

GROUND SNOW LOAD 21 psf if less than 5,000', if greater, go here:Snow Load Map
WIND DESIGN
Speedd(mph)
115 Exposure C
Topographic effectsk
NO
Special Wind Regionl
NO
Wind-borne debris zonem
NO
SEISMIC DESIGN CATEGORYf B
SUBJECT TO DAMAGE FROM
Weatheringa
Negligible
Frost line depthb
20" if less than 5,000', if greater then contact the Building Department
Termitec
YES
WINTER DESIGN TEMPe 8°
ICE BARRIER UNDERLAYMENT REQUIREDh NO
FLOOD HAZARDSg See current flood map here: Grand County Flood Maps
AIR FREEZING INDEXi 850
MEAN ANNUAL TEMPj 56.6°
For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s.
a. Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code. The weathering column shall be filled in with the weathering index,“negligible,” “moderate” or “severe” for concrete as determined from Figure R301.2(3). The grade of masonry units shall be determined from ASTM C 34, C 55, C 62, C 73, C 90, C 129, C 145, C 216 or C 652.
b. The frost line depth may require deeper footings than indicated in Figure R403.1(1). The jurisdiction shall fill in the frost line depth column with the minimum depth of footing below finish grade.
c. 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.
d. The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed map [Figure R301.2(4)A]. Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4.
e. 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.
f. The jurisdiction shall fill in this part of the table with the seismic design category determined from Section R301.2.2.1.
g. The jurisdiction shall fill in this part of the table with (a) the date of the jurisdiction’s entry into the National 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.
h. In accordance with Sections R905.1.2, 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, the jurisdiction shall fill in this part of the table with “YES.” Otherwise, the jurisdiction shall fill in this part of the table with “NO.”
i. The jurisdiction shall fill in this part of the table with the 100-year return period air freezing index (BF-days) from Figure R403.3(2) or from the 100-year (99 percent) value on the National Climatic Data Center data table “Air Freezing Index-USA Method (Base 32°F).”
j. 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 32°F).”
k. 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 table with “YES.” Otherwise, the jurisdiction shall indicate “NO” in this part of the table.
l. In accordance with Figure R301.2(4)A, where there is 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.
m. In accordance with Section R301.2.1.2.1, 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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