Get information about structural requirements for residential projects in the City of Portland.
The structural requirements for residential projects may be either prescriptive or engineered. In prescriptive design, the ORSC (Oregon Residential Specialty 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.
The following are design values that may be used for prescriptive residential design:
Wind: Applicable design wind pressure is 18 psf (ASD).
Seismic: Applicable Seismic Design Category is D1.
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