Foil insulation per specification is attached to the existing roof plywood deck and existing wood sub-purlins. The existing wood sub-purlins, sized two-inch by or three-inch per shell drawings, span across existing roof joist purlins spaced eight feet zero inches on center typical, verified with structural drawings. Foil insulation is attached to existing wood sub-purlins, and the roof joist purlins remain exposed from the foil insulation. Existing wood blocking is provided above steel or wood roof joist purlins per shell drawings.
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