SR-04Fit new gripper rods with the right fixing for your stairsCables and pipes for stair lighting or sockets under the stairs can run through tread edges and risers, so use a cable and pipe detector first, but still treat every fixing point as if something could be there. Before you start, find your stopcock (usually under the kitchen sink) and check it turns, so you can shut the water off fast if you ever hit a pipe. If you're at all unsure, isolate the relevant circuit at the consumer unit before nailing or drilling. For timber treads, nail gripper rods down with the pins angled up towards the riser, about 10mm back from the riser join, and along the base of each riser. For concrete stairs, use concrete-rated gripper rods fixed with masonry nails or a stair adhesive, following the fixing the rod maker recommends, since ordinary nails won't hold in concrete.