WDR-03Confirm your wall type and find the studsLath and plaster walls have timber studs behind narrow wooden laths, under about 15-20mm of horsehair plaster. Tap gently near your marks: a dull thud usually means a stud, a hollow knock means a gap between laths. A stud detector can help, but nails in the laths sometimes give false readings, so also look for a vertical line of old nail or screw heads where plaster has chipped, which often marks a stud edge. If your wall turns out to be plasterboard, brick, block or dot-and-dab instead, the drilling and fixing method changes - see the fixing step below for your type.