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Construction Design Criteria
Building Codes
The currently adopted building and design codes for the City of Tualatin are:
Oregon Structural Specialty Code (2022 OSSC)
Oregon Residential Specialty Code (2023 ORSC)
Oregon Mechanical Specialty Code (2022 OMSC)
Oregon Plumbing Specialty Code (2023 OPSC)
Oregon Electrical Specialty Code (2021 OESC)
Common Reference Code Standards – See chapter 35 of the 2022 OSSC for an exhaustive list.
ICC A117.1—17: Accessible and Usable Buildings and Facilities ADA
NFPA 13—19: Standard for Installation of Sprinkler Systems
NFPA 13D—19: Standard for the Installation of Sprinkler Systems in One- and Two-family Dwellings and Manufactured Homes
NFPA 13R—19: Standard for the Installation of Sprinkler Systems in Low-rise Residential Occupancies
NFPA 17—21: Standard for Dry Chemical Extinguishing Systems
NFPA 72—19: National Fire Alarm and Signaling Code
ACI 318—19: Building Code Requirements for Structural Concrete
TMS 402—2016: Building Code Requirements for Masonry Structures
ASCE/SEI 24—14: Flood Resistant Design and Construction
ANSI/AWC NDS—2018: National Design Specification (NDS) for Wood Construction—with 2018 NDS Supplement
GA-600—2018: Fire-resistance and Sound Control Design Manual, 22nd Edition
UL263—11: Fire Tests of Building Construction and Materials—with Revisions through March 2018
ANSI/MH16.1—12: Specification for the Design, Testing and Utilization of Industrial Steel Storage Racks
Seismic Zone
The seismic design category for a structure is permitted to be determined in accordance with 2022 OSSC §1613 or ASCE 7-16. All of Tualatin is located in seismic zone D - Default with engineer verified SDS value.
Basic Wind Speed
All of the City of Tualatin is wind speed 97 mph (x1.61 for km/h) for risk category II structures. Modifications to wind speed for other risk categories are determined using the 2022 OSSC §1609, and Table 1609.3.
Wind Exposure Category and Wind Loads
The architect or structural engineer responsible for the design of the structure shall determine the wind exposure and wind loads as defined in the 2022 OSSC §1609.4 and §1609.1.1 respectively.
Soil Bearing - Commercial/Industrial Projects
All new commercial buildings and additions within the flood plain or within the city's Urban Growth Boundary require a geotechnical soils report as part of the permit application submittal.
Soil Bearing - Single Family Dwellings
Default allowable foundation bearing capacity within the City of Tualatin is 1,500 psf (minimum 12” wide footing). Designs specifying greater than 2000psf bearing capacity must provide stamped engineering designs and a geotechnical soils report.
Snow Loads
Design snow loads for commercial buildings/structures shall be determined in accordance with Chapter 7 of ASCE 7-16, as modified by OSSC Section 1608. Ground snow load pg shall be determined using the Structural Engineers Association of Oregon (SEAO) online tool
Frost Depth
Minimum frost depth is 12 inches for elevations less than 400 feet.
Flood Zones
The City of Tualatin has areas that fall within the floodway and the 100-year floodplain of the Tualatin River. To determine if your site is within the flood zone, please contact Engineer Associate Tony Doran. See the 2022 OSSC §1612.
