Roof Design and Replacement
The Slavin Student Center at Providence College had experienced many years of water infiltration because of deteriorated roof coverings, de-bonded, deteriorated, and blocked flashings, low flashing heights, and inadequate roof slope. The use of a ballasted EPDM overlay roof indicated previous failure of the original built-up roof system; ponding water was caused by the inadequate slope to drain; deteriorated roof overlay membrane seams were observed; moisture was discovered in the existing roof assemblies while performing investigative test cuts. Overlay membrane flashings were unsupported at the roof-to-wall transition and had become de-bonded from the parapet walls; sealant had failed at flashing terminations; overlay membrane flashing was loose, allowing air and moisture into the roof assemblies. The masonry control joint sealant had failed, and the joints were overly compressed; sealant had been applied at the weep point of the masonry through wall flashings.