Purchase new carpeting and padding. Look on the back of the labels of several carpet samples to make sure the type you choose meets the requirements of the Carpet and Rug Institute for chemical emissions, which contribute to allergy problems.
Peel back the old carpet that is causing the allergy issues. Use pliers to peel back one corner until you are able to peel back the entire carpet, exposing the tack strips underneath. Peel up the carpet pad that was beneath the carpeting in the same way. However, first use the claw of a hammer to remove all staples originally used to attach the pad to the subfloor. This allows you to pull the pad up in one piece.
Pull up the old tack strips to make room for new ones. To do this, insert the edge of a flat bar underneath each tack strip and force the bar farther under the strip by tapping it with a hammer. Pull the tack strips up with the flat bar, and finish yanking them out with your hands. Place new tack strips along the perimeter of the room and nail them down.
Clean off the subfloor using a vacuum cleaner as well as a wet mop with a household cleaner. Apply new padding to this area. Tape the seams of the carpet pad together using duct tape.
Lay the new carpeting on top of the carpet pad. Use a power stretcher, following the manufacturer’s instructions, by digging the device’s teeth into the carpet and dragging the carpet onto the tack strips. Use a knee kicker to finish engaging the carpet on the tack strips in tight areas.
Vacuum your new carpet twice a week. Hire a professional carpet cleaning company to clean it every year to year and a half to reduce allergy issues that stem from pollen and dust.