Abstract: The invention relates to herringbone struts, in particular to such a strut made from a single piece of metal and having a cross-section of generally 'M'-shape in transverse cross-section with end flanges which are inclined at angles of greater than 90.degree. to the longitudinal axis of the strut so that in use the strut is inclined when it is secured between two joists.

Abstract: Elements for forming a frame such as a metal door frame having spring clips by which a head rail and side members are connected, and a spacer or tie bar by which the elements can be stabilized during erection of the frame in a door way.

Abstract: A lintel for a double-skin wall including a first member secured to the inner skin and a second member secured to the outer skin and adapted to be disposed over an aperture or opening formed in said wall. The first member has a downwardly extending flange portion disposed within the cavity between the inner and outer skins and spaced a slight distance from the adjacent surface of the inner skin. The second member is secured to the outer skin, as by having a substantially horizontal flange disposed below a course of blocks or the like. The second member has a sloped plate secured to the inner edge of the horizontal flange and extending upwardly into and across the cavity. The sloped plate has an upwardly extending flange on the upper free edge thereof which extends into a recess defined between the inner skin and the downwardly projecting flange associated with the first member.