Due to the roof being enclosed on four (4) sides, the new overflow drainage system will prevent potential ponding and water infiltration in the event of a primary roof drain failure. The proposed roof system will improve drainage by providing a slope of ¼” per linear foot, and by providing crickets to prevent ponding around mechanical units. New roof access doors will facilitate increased flashing heights and improved the slope-to-drain. Structural modifications of the HVAC duct supports will allow the structural members to be anchored to the roof deck, and will allow the members to be flashed with a conventional EPDM flashing boot, eliminating the fasteners through the roof membrane. Modification of the masonry through-wall flashing will provide increased flashing heights and improved slope-to-drain. New protective masonry coating will control moisture infiltration, deterioration and freeze-thaw cyclic effects on the masonry penthouse walls.
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