Abstract: A generally channel sectioned wall stud 7 which has been cold roll-formed from a sheet metal strip comprises a web 8 and two flanges 9. The web 8 has a substantial central strip that is planar. A nogging clearance hole 10, is provided in the central strip of the web 8 at each point where a nogging 11 is to be affixed thereto. The nogging 11 may be roll-formed from material the same as or similar to that of the stud 7 and is also generally channel sectioned, comprising a web 12, with a flat ended central rib 13 formed therein and flanges 14. The web 12 is pierced by clearance slots 15 arranged in two rows extending longitudinally of the nogging 11. The individual slots 15 are regularly spaced apart along the rows. The nogging clearance hole 10 is shaped to suit the nogging 11. To that end it is partly defined by two tabs 16 projecting from the web 8 and lying in the plane of its central strip 13.