Abstract: A drywall furring system comprises a plurality of longitudinal carrying channels having congruent tongues co-planar with, spaced apart along and depending from the opposite flanges of the channels and a plurality of furring channels having pairs of slots spaced apart along the opposite flanges thereof. On opposite edges of the tongues there are tabs tapering upwardly from the rounded corners thereof and elongated, narrow fingers whose lower margins angle up from a point space apart from the distal edges of the tongues. The tabs and fingers have seats in the same horizontal plane and the fingers have retaining hooks extending up beyond the seats. A gridwork of the carrying channels and furring channels is constructed by aligning opposed congruent fingers of the former with a pair of slots in the latter and passing the fingers through the slots and pushing the opposite flanges of the furring channel over the rounded corners of the tongues so that the furring strips rest on the seats of the fingers and tabs.

Abstract: A base trim system for partition corners comprises a base trim and a mounting bracket for the base trim. The base trim piece for the corner of intersecting walls has two upright wings angularly joined at a first edge of each, a recessed flange joined to the opposite edge of each wing, and a planar hook projecting upwardly from each such flange to lie in a plane between the vertical planes of the corresponding wings and flanges. The hook acts as a fastener for an abutting planar base trim piece. The mounting bracket has two planar upright wings, a recessed attachment flange connected to each wing, and an upwardly oriented planar hook extending above each attachment flange. The attachment flanges of this mounting bracket extend laterally beyond the lower flanges of the base trim.

Abstract: A base trim piece for the corner of intersecting walls has two upright wings angularly joined at a first edge of each, a recessed flange joined to the opposite edge of each wing, and a planar hook projecting upwardly from each such flange to lie in a plane between the vertical planes of the corresponding wings and flanges. The hook acts as a fastener for an abutting planar base trim piece.

Abstract: A suspended ceiling system comprising a plurality of inverted-T runners. Kerfed edge ceiling tile supported by runners and concealing the bottom of the runners. At least one ceiling tile having a central portion removable therefrom by being separable along a substantially vertical fine cut made by high pressure fluid jet cutting.

Abstract: A decorative soffit system for mounting on the bottom of vertically disposed ceiling tile to enclose a projection depending from the ceiling as disclosed. The soffit system having a U-shaped channel member adapted to rest on an inverted-T runner and said U-shaped channel member having a resilient spacer therein to hold a vertically disposed ceiling tile against one side thereof.

Abstract: An attachment system for suspended drywall ceiling panels is disclosed. The attachment system comprises a panel support grid having a series of main-runners and cross-runners disposed with lower panel attachment surfaces in generally co-planar relationship and said grid having intersection points at main-runner and cross-runner crossings. The attachment system has attachment clips positioned at said intersection points interconnecting cross-runners and main-runners. The attachment clips being integrally constructed from light-gauge steel and having a box-like configuration with two opposing vertical walls and opposing upper and lower horizontal walls wherein the upper wall centrally separates into halves. The upper wall halves include upwardly extending tabs with tab connecting means releasably connectiing both halves. The opposing vertical walls of the attachment clip each having an oppositely extending cross-runner attachment flange.

Abstract: A modular ceiling panel unit adapted for use with conventional air distribution mechanisms in suspended ceiling grid systems utilizing inverted-T runners suspended from upper support structures is disclosed. The panel unit has a body portion having a rectangular configuration with opposite parallel panel faces and four edges. At least two of the opposite panel edges have generally H-shaped integral air distribution strips, having an inner, an outer, and cross-web portion therebetween, fixedly engaged thereto for substantially the full length of the edge. The air distribution strips comprise means along the inner leg of the H-shape engaging the panel body portion edge and means at the outer leg of the H-shape supportively associated with an arm of an inverted-T runner. The cross-web of the H-shaped air distribution strip is adapted to supportively associate with a mounting portion of a conventional air distribution mechanism positioned in the plenum between the ceiling grid system and upper support structure.

Abstract: A ceiling runner and panel assembly is disclosed for a suspended concealed ceiling system. The assembly provides sliding lockability and comprises vertically adjustable hanger brackets supporting inverted-T runners concealed within ceiling tile kerfed marginal edges. The ceiling tile edges have upper portions removed at periodic intervals corresponding to tab portions on the arms of the runners. The assembly provides simplified installation and accessibility of facilitating tile engagement with the inverted-T runners by lifting and shifting to slidably lock the tap portions within the kerfed edges. The ceiling is leveled by means of vertically adjustable hanger brackets rigidly supporting the runners from fixed upper support structures.

Abstract: An apparatus is disclosed for leveling suspended ceilings while attaching them to supporting structures. The apparatus has an upper body portion having a backplate, a top plate, and a side plate with each of the plates lying in a plane substantially perpendicular to the plane of the other two plates and each of the plates having means for connection to a supporting structure. A flange extends downwardly from one of the plates and includes means for engaging the supporting portion of a suspended ceiling.

Abstract: A structural sheeting unit, such as fiberous ceiling tile, is disclosed comprising a panel kerfed around the edge thereof and having an extended edge portion provided on one side of said kerf, thereby protecting the remaining edge portion from damage during handling, said extended edge portion being weakened along a line corresponding to the remaining edge portion thereby enabling the extended portion to be easily broken away for installation.