ABSTRACT
Liquid-applied systems are sometimes the best choice when you must rule out prefabricated-sheet systems. Their self-flashing property and their availability in thixotropic grades suitable for vertical surfaces make liquid-applied systems suitable for projects with complex geometric contours; multiple plane transitions; and numerous pipe, duct, and other penetrations. Determining the precise degree of complexity needed to establish the viability of a liquid-applied membrane for a specific project is a risk-balancing exercise. The tradeoffs of construction convenience versus dependable curing are also exemplified by the few liquid-applied coatings that require jacketed kettles on the jobsite for hot application. Pinholing is a major defect that can impair the waterproofing integrity of liquid-applied coatings, as can thin applications. A low-solids LAM on reinforcing may cause pinholing because the cold-applied liquid tends to flow in between the strands of reinforcing mesh, and the reinforcing may inhibit moisture curing.
