Abstract: Novel, curable polyurethane polymers in which a proportion of the NCO terminations are reacted with certain amino silanes, or with the residual on reaction of a mercaptosilane with a monoepoxide, or with the residual on reaction of an epoxysilane with a secondary amine.Sealant compositions formed with the novel polymers are stable in storage, moisture curable and adhere well to various substrates, obviating the need for a primer.

Abstract: A flashing system for weatherproofing the areas between adjoining structural surfaces which are continually exposed to ambient conditions. A longitudinally extending bracket member is adapted to be secured to a structural surface such as a building parapet or the like. The bracket includes a longitudinally extending opening. A sheet of flexible material (preferably elastomeric) material is supported by the bracket member and covers selected areas between the adjoining surfaces. The sheet of flexible material extends through the opening in the bracket, and a stiffening member in the form of a longitudinally extending planar member has a portion secured to the sheet of flexible material. Part of the bracket member defines a longitudinally extending track portion designed to slidably engage a longitudinal edge of the stiffening member.