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Staff recommends adding structural sheathing with foam-board exteriors to Marion building code
Summary
City staff recommended amending the building code to require structural sheathing behind foam‑board exterior insulation, citing resilience and firefighter safety; staff gave cost estimates and said comparable cities allow foam board but perform extra inspections.
City building‑code staff briefed the council on April 15 about a proposed change to require structural sheathing when foam‑board insulation is used on exterior walls, recommending adoption to improve resiliency and reduce downstream repair exposure.
The presenter reported outreach to comparable cities and contractors and said staff found that other jurisdictions permit foam‑board exterior insulation but generally perform extra inspections rather than require structural sheathing. Staff provided construction-cost estimates for the added requirement: approximately $1,650 for a roughly 1,464‑square‑foot single‑family home, about $2,400 for a larger single‑family house and roughly $3,500 for a two‑unit townhouse.
Staff recommended adoption based on concerns about wind damage, fire performance and long‑term durability; presenters and some councilmembers framed the proposed change as a modest upfront cost that could reduce more extensive repair costs after severe wind or fire events. Members of the council and attendees discussed construction‑quality variables (framing connection, proper siding attachment and bracing) and whether insurance premiums or builder pushback might follow; staff said insurance carriers are reviewing loss patterns and that some carriers may view insulated‑board exteriors as higher risk.
No formal ordinance vote occurred at the work session; staff recommended council adopt the written change and said they had limited feedback from builders so far but had received cost estimates from an industry contact. Council discussion emphasized durability and doing the job “right the first time,” and staff said they will return with whatever additional information council requests.
