PR-01Check the picture rail's conditionPicture rails are usually fixed into masonry or timber studs behind the plaster, so a sound one can take real weight, but old paint and age can hide a weak fixing. Press firmly along the rail near where you plan to hang the picture. Look for cracks, gaps or flex, and make sure it's a real picture rail with a proper lip, not just decorative moulding. If it moves or sounds hollow and loose along its length, do not hang anything heavy there.