This client had leaks coming through their commercial tar and gravel flat roof. The roof itself is in good shape, but was in need of very minor maintenance.
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Inspection: February 13, 2015
The client is experiencing a small leak in the roof 15' away from the front doors, which appears to be originating around an electrical conduit penetration through the roof. The penetration itself is some two feet from the roof edge, which is among the highest points on the roof (drains are in the center). It's believed that the leak could be one of two things. First, it could be leaking around the gum box (which is starting to crack) or second, where the stack is fastened to the roof.
To fix the problem, we could first need to patch the gum box, and tighten up the bolts around the conduit and seal the area with some caulking. Otherwise, the 130' x 160' roof is in good shape, and only ten years old.
Roof Report: February 21, 2015
The crew confirmed the problem area to be the gum box, caused by a few separate issues. First, the steel pipe had moved slightly under the weight of the wire hanging off the pipe itself. Second, the crew that had installed the pipe and/or roof only filled the gum box one-quarter full of gum and three inches of insulation filler. Over time, the gum began to dry, crack, and settle; allowing water ingress and ponding.
The gum box was emptied of the previous solutions and filled 3/4 with pourable sealer, which should now be a permanent solution to the problem. As a precaution, we added a bead of lap sealant around the base of the gum box and a bead of high-quality caulking around the metal support (which had metal bolts going right through the parapet without any sealer at all).
Investigation: March 6, 2015
The client called us to assess the roof once more for three reported leaks in the northwest corner of the building. The roof is an EPDM ballast system, so gravel relocation is necessary to uncover root problems in these types of roofs. We sent out a technician to investigate the causes of these three leaks, for which they found two (need to search under ballast for the third). It would appear that there are two holes in the roof with a near-3" diameter that require patching. The third will be found during repair efforts.
This report will be updated with repair logs as they come in.
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