Abstract: A top chord for a roof truss, the top chord has a cross section so that the chord has a top web joining to side flanges. The side flanges have converging flange portions which are corrugated so as to have corrugations extending away from the web.

Abstract: A wall frame for building. The wall frame includes a generally horizontally extending plate which is engaged by a stud. Relative movement between the plate and stud are inhibited by the use of clips or brackets and deformations formed in the plate. In one embodiment, the plate is provided with eyelets which project through the stud, with the eyelets being engaged by a clip. In another embodiment, a bracket surrounds the stud and engages the plate side walls to secure the stud in position.

Abstract: The upper chord of a metal roof truss which comprises an elongated beam (10) formed of rolled form metal strip which is of a constant cross-section having longitudinally extending portions (13, 14, 15 and 16) providing flat surfaces of such dimensions that with the application of excessive load upon the beam breakdown of substantially all of said portions occurs simultaneously, and wherein most of the flat surfaced portions are of a width not exceeding that which will comply with following formula (I), where: F.sub.a =maximum permissible compression stress expressed in Mpa, .OMEGA.=load factor, Q=form factor which allows for the effective cross-sectional area, F.sub.oc =elastic buckling stress expressed in Mpa, F.sub.y =yield stress expressed in Mpa.