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I am in process of replacing complete set of outside steps. The tread are 48" long and will have seven.  Do I need a center support. I have two already sawed out, and I don't think I need a center one. They are 2"x12" and are about 7' long.  If I need to, I could nail vertical supports in place instead of third support. 

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44 minutes ago, Danl said:

I believe code in my area would require qty 4 for 2x tread material.  If you are using composite matl for the treads you will have to consult the mfg.  Some matl require spans to be 12" or less for stairs.   Danl

With a 48" span, four would be over kill, I'd think. 

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Stair stringers should be 16" on center just like the deck floor.  Three stringers would be fine for 36" wide stairs.  Hear is a link to decks.com

 

https://www.decks.com/how-to/69/deck-stair-stringer-layout

 

This means you will need to install a minimum of four stringers on any stairway wider than 36”. Always check the maximum span for your decking material as it applies to stair treads. 

 

 

Edited by HandyDan

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Our deck stair treads are 48" wide, each made of two 2x6 redwood decking boards, for a 12" deep tread.  We used 3 stringers and, it's worked well for 11 years. Passed inspection, too. Though, our codes my not be as stringent as some. 

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