Building defects database - Poor detailing

Record details

	No matter how high the specification of RBM, it will be let down by poor attention to detail. Here, a membrane has been bonded over an older, asphalt membrane. The detailing of felt is almost impossible to achieve properly in these circumstances with the result that attempts have been made to seal the top edge of the felt using an incompatible mastic sealant.
	One of the benefits of liquid roofing is its ability to accommodate difficult detailing. However, it is no substitute for a failure to design details properly in the first place.