Abstract: A back blocking device comprising an elongated member having a longitudinal axis and a first and second side. The first side of the elongated member has a first outer surface and a second outer surface that converge at the longitudinal axis. The first side has first raised portions and first recessed portions. The second side has a first inner surface and a second inner surface converging at the longitudinal axis, and second raised and recessed portions inverse to the first raised and recessed portions on the first side. First and second pieces of wallboard are positioned on either the first or second raised portions on either the first side or the second side and converge for attachment to the first or second side of the elongated member substantially near the longitudinal axis to form a butt joint.

Abstract: The invention relates to a back blocking device comprising an elongated member having a longitudinal axis and a first and second side. The first side of the elongated member has a first outer surface and a second outer surface that converge at the longitudinal axis. The first side has first raised portions and first recessed portions. The second side has a first inner surface and a second inner surface converging at the longitudinal axis, and second raised and recessed portions inverse to the first raised and recessed portions on the first side. First and second pieces of wallboard are positioned on either the first or second raised portions on either the first side or the second side and converge for attachment to the first or second side of the elongated member substantially near the longitudinal axis to form a butt joint.

Abstract: A butt joint hanger (30) includes a central elongated rail (32) and two support elongated rails (34, 36) positioned on either side of the central rail (32). One or more U-channels (38) interconnect the three rails (32, 34, 36) at pivoting attachment points (40). The butt joint hanger (30) is inserted between two construction beams (94, 96) and the butt ends (108, 114) of two sheets of wallboard (104, 112) are attached to the central rail (32) by means of drywall screws (110). The two support rails (34, 36) abut against the surfaces of the wallboard flush with the nailing surfaces (98, 100) of the construction beams (94, 96) and the drywall screws (110) force the butt ends (108, 114) of the wallboard out of the plane (102) of the wallboard and into engagement with the central rail (32). This results in a depression area (116) adjacent both butt ends (108, 114) which can be easily filled with plaster (122) to produce a flat smooth butt joint (126).