Abstract: A mold especially adapted for forming precast, waffle-shaped concrete panels employs a one-piece mold body of flexible plastic sheet material to which rigid side rails are secured by tongue and groove longitudinal joints. The mold may be rapidly stripped and reset due to a hinge action provided by partial sides of the flexible body to which the rigid side rails are joined. The side rails and other structural features provide a simple mold structure that may be readily and efficiently employed for on-site production of panels. The configuration of the side rails and associated joints facilitates the replacement of a wornout mold body.

Abstract: A mold especially adapted for forming precast, waffle-shaped concrete panels employs a one-piece mold body of flexible plastic sheet material to which rigid side rails are secured by tongue and groove longitudinal joints. The mold may be rapidly stripped and reset due to a hinge action provided by partial sides of the flexible body to which the rigid side rails are joined. The side rails and other structural features provide a simple mold structure that may be readily and efficiently employed for on-site production of panels. The configuration of the side rails and associated joints facilitates the replacement of a wornout mold body. A cover may be placed over the mold body while the concrete cures and automatically lifted therefrom after a predetermined time to allow the concrete to cool. Recess formers and connector covers for the panels are provided for appearance and security.

Abstract: A precast concrete roof trim system comprising linear edge segments installed in the side edges of a roof and corner segments installed on the corners of the roof. The corner segments each have free ends engaging the corresponding ends of a spaced pair of the edge segments. Each edge and corner segment has a roof engaging portion with a first surface and a second surface. The first surface engages the roof when the segment is in a first position, and the second surface, which is transverse to the first surface, engages the roof when the segment is in a second position. Each segment has an extension which overhangs the roof when the segment is in the first position and extends upwardly from the roof when the segment is in the second position.