More in Floors
Cut the non-slip carpet pad to widths two inches less than the width of the carpet runner and one inch less than the depth of the tread. Center the pad on each step and staple it in place.
Staple the bottom of the runner to the bottom of the first riser and also under the lip of the tread.
Use a carpet knee kicker to stretch the carpet to the corner between the tread and riser of the next step and staple it in place. Make sure the carpet is taut. Continue up the stairs until done.
At the corner of each tread and riser, use a carpet stair tool with a hammer to push the carpet into the corner.