Nail down another strip of tackless strips next to old tackless strips to help secure the new carpet. One row of tackless strips is often not wide enough to prevent carpeting from bunching or pulling away from the wall over time. The old tackstrip must be 3/8 of an inch away from the wall. Move old tackstrips to set them at 3/8 of an inch from the wall with a pry bar. Hammer nails into the new tackless strips.
Spread carpet pad adhesive in a zigzag 4 inches away from the wall around the perimeters of the room. Cut a piece of extra carpet padding to spread the adhesive out. Wait five minutes for the adhesive to set. Unroll the carpet padding and press on the adhesive. Press tape over the seams to join two pieces of carpet padding.
Unroll the carpeting, so that it rides up the walls 6 inches. Press the carpeting next to the wall and cut to fit the room using a utility knife. To create seams, overlap two pieces of carpet and cut through both pieces so that the edges butt tightly against each other. Lay a piece of seam adhesive underneath the seam and heat up using a seam iron. Press the seams onto the adhesive.
Place a knee kicker in one corner of the room. Press the teeth down, so that it grasps carpet 1 inch away from the wall. Push your knee in to move the teeth and carpeting to the tackless strips. Use a stair chisel to help you push the carpeting down on the tackless strips. Continue using the knee kicker to attach carpeting up the wall and the adjacent wall.
Set a power stretcher 6 inches from the opposite wall. Turn the dial knob on the carpet stretcher, so that it penetrates through the carpet. Press the power stretcher handle down to stretch the carpet. Stretch the carpet every 18 inches along the wall.
Push a carpet roller over the entire floor.
Vacuum the carpet to remove dust.