PB-01Confirm your wall is solid brick or blockTap the wall where you plan to fix the bar. A dull, solid knock all the way across means solid masonry. A hollow sound, or a change from solid to hollow as you move along, means you may have dot-and-dab plasterboard over masonry, or a stud wall. Drill a small 3mm pilot hole and check what comes out: brick or block gives fine red or grey dust; a stud wall gives timber dust or fine steel swarf and the drill will feel like it hits nothing solid for 10-12mm first. A pull-up bar puts a strong, repeated pulling force on the wall, so plasterboard on timber studs, metal studs, dot-and-dab, or lath and plaster on their own will not hold it — only solid masonry, or a fixing that goes right through to the masonry behind, is safe for this job.