The structural requirements for residential projects may be either prescriptive or engineered. In prescriptive design, the Code defines a conservative method of construction to resist vertical and lateral loads. In engineered design, an engineer licensed in the State of Oregon prepares engineering calculations and drawings that demonstrate how the structure resists vertical and lateral loads.
View the current State Building Codes and Rules. Refer to Commercial Permits, above, for information regarding engineered residential design.
The following are design values may be used for prescriptive residential design:
Wind: Applicable design wind pressure is 18 psf.
Seismic: Applicable Seismic Design Category is D1.
Transmission and Cell Towers
Design loads shall be determined per Structural Standards for Steel Antennae Towers and Antennae Supporting Structures (TIA/EIA-222 F-96). The structural design must account for atmospheric ice loads and increased wind load on ice covered sections
Signs and Fabric Covered Awnings
Signs and fabric covered awnings are governed by City of Portland Title 32.
Signs: Structural design per Title 32.42.010.
Fabric Covered Awnings: Structural design per Title 32.52.010.
Floating Structures are governed by the City of Portland Title 28.