Installing carpet is a multilayered process. Once the carpet has been laid, you must finish your edges. The carpet can be covered at the walls with trim or moulding, but an open spot will still exist in each doorway where the carpeting ends. Installing a slim piece of metal -- called a carpet gripper -- over the edge of the carpet in these openings will hold the carpet down, prevent fraying and remove the tripping hazard posed by loose edges.
Use a razor knife to trim carpet in the centre of the door frame. Use the side of the 2-foot level as a straightedge to get a perfect cut.
Cut the carpet gripper with tin snips to fit the door frame. Making one clean cut across the metal instead of several small cuts will eliminate uneven edges.
Drill 1/8-inch holes in the carpet gripper, 1 inch from each end. Make a series of holes between the first two, spacing each hole no more than 8 inches from the last.
Place the carpet gripper over the edge of the carpet. Move the metal strip so it rests evenly between the carpet and the adjoining floor.
Use a hammer to drive a 4d finishing nail through each of the holes and secure the gripper to the floor. Be careful when driving the nails, paying particular attention not to bend the carpet gripper.
Work gloves and eye protection are recommended when using hand and power tools.