Abstract: Insulation for the roof of a building. The insulation comprises a plurality of distinct layers of flexible insulation blankets with a spacer channel member interposed therebetween. A spacer block can be included to space the top layer of insulation from a roof panel at a location adjacent a purlin. The spacer member is channel-like and is generally U-shaped in transverse cross-section and is adaptable to be used in conjunction with a variety of purlin shapes.

Abstract: An element for sealing end voids of corrugated roof panels. The element is shaped and sized to correspond to the shape and size of the corrugated panel end void, and comprises a flexible body having a flange thereon. The flange is grooved for mastic application. An alignment prong cooperates with alignment means in a building structural element so that the element is properly oriented in the end void, and stiffening ribs produce the desired amount of rigidity for the element.

Abstract: A chain of the type that is used in a reciprocating chain drive. The majority of the chain is constructed of conventional links that mesh with and are driven by rotating sprockets. A specially constructed link is included in the chain to disengage from the sprockets if the reversal controls of the chain drive mechanism malfunction. The special disengaging link is provided with an inclined plate which cams against the sprocket teeth to divert the chain off to the side of the sprocket if the disengaging link reaches the sprocket due to a control malfunction.

Abstract: A roof structure for a building having a non-rigid type frame, in which the roof structure includes roof panels secured to a secondary frame, the secondary frame being secured to a primary frame which is, in turn, secured to the walls of a building, and braces connected to the secondary frame so that lateral forces imposed on the side walls of the building are transmitted through the primary frame to the secondary frame and thence to the roof panels, said panels thus transferring the lateral forces imposed on the side walls of the building to the shear resisting walls or structure at the ends of the building.

Abstract: A fire resistant ceiling for a building having a space grid construction comprised of a plurality of horizontally extending space trusses with bottom chords or bases thereof having oppositely directed flanges supporting fire resistant ceiling panels thereon, and grid protecting fire resistant panels secured to the space truss bottom chords between adjacent edges of the ceiling panels to protect the space trusses from fire.