angle shelf 184 anchored directly to concrete slab 186 supported by joist 140 by anchor 188 and elastic sealant 190 and sealant back up 192 are between upper brick layer 194 and shelf 184 material to be concealed within a wall may be installed to pass between chords of a beam without the need for drilling holes as with solid beams for example insulation not shown may be located between beams 20 and spaced apart chords 22 a and 22 b of beams of the wall frame it will be appreciated that plate clips 24 connecting inner chords 22 a and outer chords 22 b act as a reduced thermal bridge between the outer and inner portions of an external wall than if a unitary metal beam were used beam 20 may be installed as part of an outer wall as illustrated in fig1 in addition to the components detailed above a primary surface 210 such as cement board or plywood may be fixed directly to the outer chord 22 a of beam 20 by any suitable conventional manner rigid insulation 212 may be applied to the primary surface 210 by conventional means insulation 218 may be located between beams 20 and spaced apart chords 22 a.