Fasten the treads with carpet tacks if your stairs are already carpeted.
Carpet tacks for stairs.
Carpet on stairs usually requires some sort of hardware.
Carpet tackless strips are almost always strips of douglas fir wood usually 4 feet long by 1 inch wide with very sharp nails protruding through them at 60 degree angles and tacks or brads partially sunk in the strip.
Prepare the stairs using tack strips and thin pieces of wood similar to yardsticks with tacks pointing upwardm to hold your carpet in place.
Insert three carpet tacks in the center of each stair tread and another tack in each corner making a total of seven tacks.
For example if the stair is 30 inches wide your carpet runner will measure 26 inches wide so your tackless trips must measure 24 5 inches wide.
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To achieve the right grip you need to.
Carpet tacks for stairs.
Prepare your stairs for carpet installation by installing tack strips thin pieces of wood resembling yardsticks with tacks pointing upward.
These will grip the carpet backing and hold it in place.