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Design Criteria

What design criteria do I need to meet?

The State of Washington mandates enforcement of the 2012 International Building and Residential Codes. Cowlitz County adopts these codes with the following design criteria:

Basic Wind Speed, for residential structures V: 85 miles per hour, for non-residential structures, reference IBC Section 1609 
Seismic Design Category: D-1
Frost Depth: 12 inches
Winter Design Temp.: 22 F degrees
Mean Annual Temp.: 51.5 F degrees
Ground Snow Load: Per Table
A

                                                                    TABLE A

Elevation

Minimum Snow Load

200 or less

20

201-400

30

401-700

35

701-1000

45

1001-1300

55

1301-1600

65

1601-1900

75

1901 +

80

Minimum snow loads for elevations in excess of 2000 ft shall be approved by the Building Official



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