To install the tackless strips, use a saw or shears to cut the length needed to fit each wall.
Nail the strips around the perimeter of the room using masonry nails, leaving a space between the tackless strip and the wall that equals 2/3 of the thickness of the carpet.
Note: Make sure the tackless strips join together at the corners and the pointed pins in each strip are facing the wall.
Lay out the padding waffle side up, then staple it along its edge every six inches. The padding should not overlap and should form a clean seam. Cover the seams with duct tape.
Measure the room's length and width, then cut the carpet four to six inches longer than the room's dimensions. Use a utility knife to cut the carpet from the backside. Overlap each piece of carpet at the edges to allow for trimming.
Note: Make sure when cutting and laying the carpet, that its pile is facing the same direction.
Overlap the edges of the carpet leaving about two inches of excess carpet at the wall. Use seaming tape to join the seams. Use a seaming iron to melt the adhesive by slowly pulling the iron down the tape. Once the adhesive is melted, immediately press the carpet edges together over the tape. Roll over the seam with a rolling pin.
Adjust the wall trimmer to the carpet thickness and trim the excess carpet at each wall. Use a stair tool to push the edges of the carpet between the wall and the tackless strips.
Trim the carpet at the doorway, centering the end of the carpet under the shut door. Install a gripper edge or nail in a metal strip to hold the carpet in place.