is shown at a gable end for a lean to type conservatory the arrangement is substantially the same as shown in fig4 except for the shape of glazing bar used and provision for variations in alignment of supporting windows relative to the glazing bar like components in fig4 and 5 have been given the same reference numbers the glazing bar 200 has a first side 202 which has the same formation as the first side 74 of the glazing bar of fig4 the glazing bar has a second side wall 204 which is stepped to provide a sloping face 206 which has a groove 208 to locate fixing screws 209 through the glazing bar into the top of the windows 210 to fix the glazing bar down extending outwardly from the screw face 206 is an upwardly stepped flange 212 having a serrated top surface bottom end 216 of the second side 204 of the glazing bar has a foot 218 extending laterally to both sides a position adjustable plate 220 is situated on the top of the windows the plate 220 has on its outer edge a slotted upstand 222 an inverted l shaped cover piece 224 the top limb 226 of which has a serrated bottom surface to engage the top surface of the flange 212 of the glazing bar and depending limb 230 thereof has a notched rib 232 that locates in the slot 222 which itself has a lip 234 to retain the notched rib 232 the plate.