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It is unfortunately common to have river rock ballast on EPDM around here.
Agreed that this area is susceptible to further damage. Any idea as to what the underlying cause for the membrane pulling away from the parapet wall is? Or more specifically what it is called?
The photos are only a couple of several concerns with this roof.
My client was with me (or at least their maintenance supervisor who by the way was an excellent second set of eyes during the entire inspection) and concurred that the roof covering was a severe concern requiring immediate replacement. We were both surprised to find little evidence of problems in ceilings below this roof. But we both suspected the spongy insulation was soaking up the majority of the evidence.
We find gravel ballast on EPDM roofs around here constantly. The main reasons for it here is 1) UV protection as we have some really intense sun around here especially being a mile high. 2) Hail protection. As far as the delaminating is concerned I would consider the fact that the picture of the corner appears to have the improper type of sealant on it so they may have run low on the proper adhesive and used the same product. More likely it was either a lack of the proper amount of adhesive or possibly adhesive applied to a surface that was not prepared properly. Just my 2 cents worth. Either way you are correct in the fact that it requires attention.