A building construction 30 having a cavity wall with inner 31 and outer 33 skins and a cavity, and an opening 35 in the wall, for example for a window or door, a drainage element 37 located at the upper edge of the opening to cover an exposed part of the cavity and having a drainage surface for collecting liquid in the cavity above the opening, and a drainage conduit 10 for conveying liquid from the drainage surface to the outside of the wall without passing out of a front face of the outer skin. The drainage element may be a lintel, damp proof course or cavity tray and the conduit may be a wall weep being a pipe which may be integral with the cavity tray or may have apertures for receiving water from the drainage surface. Also claimed is the wall weep which may be a PVC pipe and have a U-shaped portion for extending around the edge of the drainage surface such that the opening to the pipe is below the surface and may be concealed in a masonry block at the side of the window/door.
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