Climatic and Geographical Design Criteria 2012 IRC Table R301.2(1)

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Climatic and Geographic Design Criteria:

Roof Snow Load 

Wind Speed (d) (mph)

Seismic Design Category (f) 

Winter Design Temp (e) 

Footnote (h) 

 90

-13 

Ice Barrier
Underlayment
Required (i)
Flood
Hazards
Air
Freezing
Index (j)
Mean
Annual
Temp (k)
yes g 2500     35.4º

Subject to Damage From:

Weathering (a) 

Frost Line Depth (b) 

Termite (c) 

Severe 

40 in. 

Slight 

 For SI:  1 pound per square foot=0.0479 kN/m.0 2, 1 mile per hour=1.609 km/h.

a)  Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code.  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).  This part of the table is filled in depending on whether there has been a history of local damage. Twenty Four (24") inch deep footers are permitted for decks only, which do not support roofs and are less than 30 inches above grade.

c) The part of the table is filled in depending on whether there has been a history of local damage.

d) Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4.

e) Reflects local climates or local weather experience as determined by the Building Official.

f) Seismic Design Category determined from Section R301.2.2.2.

g) See Amendment 1612.3 IBC

h) Snow-loads of 90 lbs. pursuant to square foot are required for construction sites below an elevation of 10,000 feet. For construction sites at an elevation of 10,000 feet or greater, the snow-load shall be one hundred pounds (100) lbs. per square foot. There shall be no reduction in snow-load for pitch or duration. See Building Official, 970-453-3180.

(i) In accordance with R905.1 as amended.

(j) From the 100 year (99%) value on the National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32degrees F)"

(k) From the National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32 degrees F)"