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You can find the 2018 IRC Table R301.2(1), Climatic and Geographic Design Criteria for Island County. This is the Design Criteria that your engineer needs to design your building.
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Island County is reviewing with the requirements of the 2018 code cycle.
Sign up for an account on Island County Planning's Public Portal to review the status of your building permit, review permit information, request inspections, and to get general information about your building permit.
Yes, alternative materials are allowed. It is the owner's responsibility to provide all information for minimum code compliance of proposed alternative materials. This may also include engineering.