need to reinforce stair stringers?

Old 06-14-06, 11:50 AM
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need to reinforce stair stringers?

I just put in three stair stringers - about 16 inches apart for a 38 inch wide set of stairs - 5 steps in total.

I used 2x12 and cut the risers and runs out. Riser=7 and run=10.

I know this is the wayto do it (right?) But I just want to check and make sure thatthe 2x12 will still be strong eno0ugh. There is approx. 5 inches of wood atthe lowest point of each rise/run point. This wouldnt break, would it? I didnt overcut, sostrength wasnt compromised there.

Im just wondering if I should glue/screw a 2x4 along the side of the stringer, belwo the cuts and on the inside where it would not be seen, as reinforcement.

Is this just overkill?
Old 06-14-06, 03:23 PM
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You don't need to reinforce it with only 5 steps. If you had more than about 7 steps, you would simply add a post at mid-span under each of the outside stringers and a beam across to support the center stringers.
Old 06-14-06, 05:26 PM
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Cut-out stingers sometimes can have one more drawback than simply weakening the stringer. I have seen the triangles fall off, due to straight line grain connecting the two ends of the cut.

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