Laminated gypsum partition

Claim 1

A corewall comprising a plurality of corewall panels comprising two coreboards of a composition unsuitable for retention of screws, said coreboards being of substantially equal length and also of equal width and adhesively laminated together with the respective ends of said boards substantially aligned and the respective side edges of said boards offset at least about 2 inches forming offset portions of the portion of each said board which extends beyond the side edge of the other said board, elongate screwable metal channels disposed on each of the four coreboard side edges of said penel extending substantially the complete length of said side edges, said channels including an elongate base of a width equal to the coreboard thickness and two flanges extending perpendicular to said base and disposed on opposite face of said coreboards, each said panel being affixed at one end to a metal floor runner and at the other end to a metal ceiling runner, each pair of adjacent corewall panels having overlapping offset portions consisting of one offset portion of each of said panels of said pair, and a plurality of screws extending through at least one of said offset portions and into one of the flanges of the channel on the opposite offset portion.