I have a 5-story residential multi-family stick-built structure on a concrete podium in the DC Metro area. The building is fully sprinklered including interstitial spaces. The pre-engineered roof trusses are 30" deep with 6" of R-30 rigid insulation above the top chord of the truss.
Based on the image below, can the space be protected with a wet system or would a dry system be necessary?
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