FAQ

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CRI 105 - STANDARD For INSTALLATION of RESIDENTIAL CARPET Copyright © 2015 by The Carpet and Rug Institute, Inc.
Broadloom Carpet
15.0
Carpet on Stairs
The following section covers proper procedures for installing carpet on stairs.
15.1
Preparation
It is required that the stair tread, riser and stair nose should be clean, dry and structurally
sound. The stair nose return should be rounded 3/4 to 1 inch (19 to 25 mm) to prevent
sharp stair edges from cutting carpet and/or cushion, and to provide proper carpet contact
for adhesive installations. When carpet is installed over a separate cushion, extend the
cushion over the stair nose.
15.2
Stretch-in Installation
Tack strip is to be installed on each tread. It is required that pins on the tread point toward
the riser. On a waterfall-type stair installation, tack strip is to be installed on risers also.
Pins on risers point down to the tread. It is required that the gully between strips be
slightly less than double the carpet thickness. Where a turned finish is desired, tack strip
and cushion are about 1½ inches (38 mm) less than the carpet width, to allow for a turn
under on each side of the stairs. Some stairs require tack strip on the sides to maintain the
proper tension. When using a cap-and-band or contoured technique, tack strip is not used
on riser.
NOTE: When staples are used in upholstering carpet on stairs, take care to separate pile
yarns to avoid trapping yarns, resulting in visible distortion. If the edges are exposed, they
must be edge sealed. Upholstery work needs to have no raw edges exposed. Any seams or
joints must be sealed. Carpet seams need to be split in the direction of the balusters/
spindles.
15.3
Glue-down Installation
Install carpet on stair treads and risers using recommended adhesive. Stairs without a
return (nose) can be installed as one piece over the tread and riser. It is required that on
stairs with a return, carpet be cut and installed with the tread and riser being separate
pieces.
15.4
Carpet Direction
It is recommended that machine direction of the carpet be installed in the length direction
of the stairs.
NOTE: Most manufacturers recommend carpet pile direction run down the stairs.