Roof failures are usually design failures and nobody wants to admit it

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Photo taken from an architect who's seen too many roof failures everyone blames materials or installation but like 80% of the time it's a design problem that made failure inevitable converging valleys with no drainage plan? design failure 1:12 slope in a region that gets 40" of rain? design failure metal roof with zero expansion joints? design failure ventilation slapped on as afterthought? design failure saw a roof leak at 18 months, homeowner blamed "cheap materials" actual issue - multiple...