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Thurston County Climatic and Geographic Design Criteria
| Ground Snow Load | 20 pounds per square foot |
| Wind Speed | IRC = ultimate wind speed 110 mph Figures
R301.2(5)A IBC Table 1609.3.1& ASCE-07-16 = V basic 100 mph |
| Topgraphic Effects | No |
| Seismic Design Category | D2 unless information that demonstrates that the site Sds is less than or equal to .83g on the United States Geological Survey Seismic Design Maps. |
| Weathering | Slight to moderate |
| Frost Depth | 12 inches |
| Termites | Slight to moderate |
| Decay | Slight to moderate |
| Winter Design Temperature | 17° Fahrenheit |
| Ice Shield Required | No |
| Flood Hazard | For information about your specific property, contact the Building Development Center. For general information about Special Flood Hazard Areas, click here. |
| Air Freezing Temperature and Mean Annual Temperature | See the Washington State Energy Code. |
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Contact Us
Questions can be emailed to staff at the email addresses below. Just click on the e-mail address and send your questions. We would be glad to help answer any question you have about your construction plans.
Commercial and Residential plan review: Available Monday through Friday, 8 a.m. - 4:00 p.m. at the Building Development Center. Tim Rubert: tim.rubert@co.thurston.wa.us; Patrick Carnahan: patrick.carnahan@co.thurston.wa.us (360) 754-3355 ext. 7289.
Building inspections: Available Monday through Friday, 7 a.m. - 8 a.m. at (360) 786-5489. Requests for permit extensions: permit@co.thurston.wa.us. To request an extension of a building permit, submit a request prior to the expiration of the building permit. Click here for the building permit extension request form.
Fire marshal and fire annual safety inspection: Bobby May: bobby.may@co.thurston.wa.us.
All other building or fire code questions can be directed to the Building Services Supervisor, Chris Edmark: chris.edmark@co.thurston.wa.us or by calling (360) 786-5466.
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