SC-02Confirm you actually have a solid wallTap the wall across the fixing area. A solid brick or block wall sounds dull and dense everywhere, with no hollow patches. Drill a small pilot hole and check the dust: brick or block gives fine red-brown or grey masonry dust. If instead you get timber dust, steel swarf, a hollow sound between evenly spaced points, or a soft plasterboard feel with no solid backing, you actually have a stud wall, dot-and-dab, or lath and plaster, and this guide's fixings will not work — you'll need a different fixing for that wall type before going any further.