An average-size room is 12 x 12, but carpet and carpet padding may be cut with a utility knife to fit almost any space. Experts recommend consulting a professional carpet installer when laying carpet on stairs or if the carpet and padding require a seam. This type of carpet padding installation uses staples and therefore, no glue or other adhesive is necessary.
Purchase the padding, wooden tack strip, stapler, staples, hammer, nails and duct tape.
Lay tack strip out at a space equal to the thickness of the carpet. Secure the tack strip to the subfloor with a hammer and nails, the small points facing up. Cut any seams and secure together with duct tape.
Place the carpet padding on the tack strip. Staple it to the subfloor. Trim away any excess padding with a utility knife.
Loosely lay the carpet out in the required position over the padding. Use a carpet kicker and carpet stretcher to stretch the carpet to where it lays over the tack strips.