are there any carpet manufactures that have a stairs warranty other than Shaw??

This is a good question, and one I will be facing soon. Hope someone answers.

Stairs are a particularly tough place to put carpet and get good performance. It has been my experience that the very edge of the step wears faster than any other area of a home.

Just because Shaw has a warranty, it will likely still wear more than other areas. Read all warranty information carefully. Regardless, you don't want to go through a warranty claim, it usually is a frustrating experience.

If you have to put carpet on stairs, pick nylon or triexta (smartstrand) and get one that is short and dense, as close to commercial grade as possible. Stair runners typically do well on stairs and they are short and dense.