I was doing a roof inspection the other day and I took these pictures. Black spots are in certain areas. Is this ok? When I run my hand across the spots there is a gritty feeling. They have be...
Possibly mold or mildew which can be removed, but I tend to believe it is the normal sluffing off of the top layer of the EPDM material. It is normal as the material ages and does not compromise the roof. Dicor makes products that work well for recoating the roof if desired.