Planning and special tools
While the techniques we show are similar to the ones used for installing new carpeting, we don't recommend installing large tracts of new carpeting. Seaming, layout and hauling are best left to the pros. And compared with the price of new pad and carpet, pro installation fees are relatively cheap.
If you only need to remove wrinkles, skip all of the business on tacking and re-laying the carpet just use the techniques shown in Photo 8 and the stretching sequences we show.
You may be tempted to build a new bookcase or other project on top of your carpet. Resist the urge! It'll just make your construction work and future carpet replacement harder, not to mention the risk of damaging the carpet while you're working.
The most important tool to rent is a “power” stretcher (Photo 8). It does the lion's share of the stretching. If you have tight areas where the power stretcher won't fit (spaces less than 3 ft. from adjoining walls), you'll also need to rent a “knee kicker.” If a carpet cutter is available, rent it, too (Photo 10). It'll cut off carpet edges more cleanly and accurately than a utility knife. In addition to these tools, you'll need a pry bar to remove the tack strip (Photo 3), a stapler with 5/16-in. staples to reinstall the pad, and a tin snips or a chisel to cut the new tack strips to length (Photo 4).
Tip: Before you run to the rental store to pick up your carpet stretching tools, have the tack strips installed and the pad stapled down. Chances are you'll only need the tools for a few hours, so you want to be ready to use them right away to save on rental fees.
Step 1: Pull back the carpet and pad
Lift one corner of the carpet with a pair of pliers and gently tease it free of the tack strip (Photo 1). But be careful; it's easy to unravel the fibers. Then you'll be able to grab hold of the carpet and pull it away from all the tack strips like a zipper. Also be careful not to pull the carpet past doorways where you might break a seam. You'll have to hire a pro to come and fix it.
Before you pull back the pad, pull out all of the staples with a screwdriver and pliers (Photo 2). Don't pull the pad through the staples, or it will rip. If you have any pesky floor squeaks, this is the perfect time to take care of them. Walk around the room with a keen ear and mark the squeaks on the floor. Fix them by screwing the subfloor to underlying floor joists with 2-1/2 in. screws. Now go ahead and install that new bookcase and we'll show you how to reinstall the carpet.
Step 2: Remove old tack strips and replace with new ones
Tack strips have prestarted setting nails that secure them to the floor and needle-sharp nails driven at slight angles that grip the carpet after it's stretched (Photo 3). Wear gloves when handling them or I guarantee you'll have blood on your hands! If you have a wooden floor, pull up and discard as many 4 ft. tack strip sections as needed to clear the base of your project. It's easiest to pry them up by pounding a pry bar under the setting nails (Photo 3).
If you have tack strips in a concrete floor, carefully lay out your project's footprint on the floor and chisel through the tack strips just outside the layout marks. Then pry out the wood through the concrete nails (they won't pull out) and break off the nails by hitting them sideways with a hammer. Breaking off the concrete nails will probably leave craters in the concrete, which makes it hard to drive in new ones.
Make sure to point the carpet-gripping nail tips toward the wall when you install them (Photo 5) or they won't hold the carpet in place during stretching. Position them half the thickness of the carpet away from the wall (e.g., 3/4-in. thick carpet, 3/8 in. away from wall). Installing them is simply a matter of driving the prestarted setting nails into the floor with a hammer. Don't leave any gaps at corners or between lengths.
Tack strips always come in 4 ft. lengths and are available with concrete nails for slabs or standard nails for wooden floors, so be sure to get the right kind. Cut the strips to length with a tin snips (Photo 4). If you can't get at the setting nails because of an overlying toekick or an overhang, pull them out and set the tack strip in a bed of construction adhesive. But wait overnight for the glue to set before stretching the carpet. Or use a cold chisel or flat bar as we show in Photo 5.
Step 3: Reset the carpet and stretch it
When you're ready to reinstall the carpet, trim the pad so it rests right next to the tack strips and staple it every 3 in. or so along the seams and the tack strip (Photo 6). Then roll the carpet against the new built-in and make diagonal cuts away from the corner (Photo 7). Then cut off all but 3 in. of the excess with a utility knife. Work from the underside to make cutting easier. You'll cut off the 3-in. overlap after stretching, as we show in Photo 10.
The power stretcher kit comes with extension sections so you can adjust the shaft length to the room dimensions. It works by bracing one end against a wall while you embed the teeth of the head in the carpet about 6 in. away from the unanchored edge. As you force the lever down, the teeth dig through the surface fibers, grip the carpet backing and stretch the carpet. Before you release the handle, push the carpet into the tack strip directly in front of the head. Protect the wall or woodwork by resting the “pushing” end against a short length of 2x4 (see the stretching sequence below).
The dial on the power head determines how deep the teeth dig into the carpet. The deepest setting works best for most carpets. Push down on the lever firmly to get a good stretch. You should feel the carpet stretch and see wrinkles disappear. Smaller spans require less pressure. If it takes all your strength to push down the lever, you're overstretching, and if it pushes down with little effort, the carpet isn't tight enough. To increase the force, lift the head free of the carpet, raise the handle, embed the head and try again.
After stretching the length, use the knee kicker to set one side (the door side; Photo 9C). Also use the knee kicker to stretch confined areas where the power stretcher won't fit (Photo 9D). Set the teeth of the knee kicker into the carpet about 6 in. away from the wall and kick against it with the area above your kneecap (Photo 9). Immediately after kicking, embed the carpet in the tack strip with your hand to hold it in place. With more or harder kicks, you can “ratchet” the carpet tighter
Step 4: Carpet stretching sequence
Photo 9A: Power stretch the length
Power-stretch the length first, following the numbered sequence shown. Beginning at one end of the built-in, stretch the carpet and then push the carpet backing into the tack strip with your hand. Stretch in 18-in. increments, moving first toward any side wall that has a door. Then finish stretching against the built-in and the wall at the other end.
Follow Photos 9A — 9D for proper stretching technique.
Step 5: Finish with the carpet cutter
Using a carpet cutter and a utility knife (Photos 10 and 11), cut off the excess after the carpet is completely stretched. Cut an entry point for the cutter with the utility knife from the back. The cutter is designed to trap the carpet against the woodwork and cut it accurately. You'll have to push hard to force the carpet against the wood, otherwise you may cut it too short or long. If you don't cut enough, make another pass in both directions. If the rental store doesn't rent carpet cutters, you'll have to make all of your cuts with a utility knife, working from the backside. Be careful and work slowly to keep your cut accurate.