Abstract: A waterstop/mechanical seal for use with an expansion board providing a watertight seal between adjacent concrete sections. The waterstop/mechanical seal comprises a continuous diaphragm element for covering one end area of the expansion board when positioned between the adjacent concrete sections. The waterstop/mechanical seal includes a top portion adapted to lie in general co-planar relationship with an upper surface of the adjacent concrete sections. Spaced sidewalls are integrally connected to and extend a predetermined distance downwardly from the top portion along an outside surface adjacent to one end area of the expansion board. Each of the sidewalls include at least one arm projecting laterally outwardly and spaced below the top portion, which arms are provided with a plurality of waterstop means for channeling liquid away from the expansion board.

Abstract: A porous, filamentary mat has a plurality of layers that are in intimate face-to-face relation and that have portions of the confronting faces thereof bonded together to enable those layers to constitute a unitary, porous, filamentary mat. Each of the layers has a plurality of elongated filaments of thermoplastic material; and each of those filaments is arranged in an essentially horizontal attitude and is longer than the mat. Each of those filaments has a number of bends therein which cause portions of each filament to cross and to engage other portions of that filament; and those bends also cause portions of each filament to cross and to engage portions of one or more adjacent filaments.

Abstract: A roof ridge ventilator for an open roof ridge has a one-piece molded plastic elongated body having a hinged area to facilitate bending along the open roof ridge and mounting to adjacent sloping roof surfaces in proximity to the open roof ridge. Integral underlying supporting structure supports the roof ridge ventilator above the sloping roof surfaces and includes an end wall on opposite sides of the roof ridge ventilator. A series of upwardly facing vents are provided in the vicinity of each end wall for ventilating air from beneath the roof through the open roof ridge and through the upwardly facing vents to atmosphere. An air deflector extends between each end wall and the upwardly facing vents to direct wind and wind driven water flowing upwardly along a sloping roof surface to follow a path above and over the upwardly facing vents, while also creating a negative pressure differential above the upwardly facing vents to assist in ventilating air beneath the roof.

Abstract: The present invention provides a batten bar of plastic, corrosion-resistant, material which has thick side portions that resist curling, kinking, looping and distorting of that bar, even when the fasteners that are used to secure that bar and the underlying membrane to a roof are overdriven. That batten bar has a connecting or bridging portion between the thick side portions thereof; and the upper surface of that bridging portion is displaced below the upper surfaces of the thick side portions to form an elongated groove which is at least as deep as the head of a fastener which is used to secure that bar and the underlying membrane to a roof.