If your stairs follow the standard dimensions it will be much easier to measure and lay your carpet as carpet runners designed for the standard dimensions will be easy to find.
Carpet corner stairs.
Outdoor carpet stair runner safety bar for stairs.
To make laying carpet.
Once you have brought the carpet around the posts wrap it around the side of the stair and fasten it underneath the side nosing.
Follow these steps to remove old carpeting from stairs.
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Carpeting stair corners is a do it yourself chore that looks harder than it really is.
How to upholster a corner on a bench duration.
Light duty ribbed design black 12 1 4 in.
To contour the 90 degree angle where the side of the stair meets the front of the stair make a slit in the carpet diagonally from the corner to the outside of the carpet.
As tempting as it may be to just grab a loose corner of carpet and start pulling preparing ahead of time and following a proper sequence.
Assuming you have standard sized stairs and allowing for 3 inches on either side to display the wood you need 24 inches for each stair step and riser.