ampersand
Structural
- Sep 2, 2005
- 30
Suppose you are calcing some exterior wood stairs, built the traditional way- (2) 2x12 stringers, notched, resulting in a remaining depth of 5-1/2".
I've never been sure what adjustment factors to use, and NDS literature seems to indicate that we are not allowed to notch a bending member more than 1/6 the depth, which would mean we simply cannot build stairs this way. Also, I have spoken to someone at AWC about ripping members, and he informed me that once a member is ripped, it must be regraded before we can know what allowable stress to use. Our notched stringer is quite similar to a 2x12 ripped down to 2x6 dimensions, but with some extra bits above which hold our treads where we want them...
But contractors always build stairs this way, and I would like to accomodate them... so any advice would be appreciated.
Cheers!
I've never been sure what adjustment factors to use, and NDS literature seems to indicate that we are not allowed to notch a bending member more than 1/6 the depth, which would mean we simply cannot build stairs this way. Also, I have spoken to someone at AWC about ripping members, and he informed me that once a member is ripped, it must be regraded before we can know what allowable stress to use. Our notched stringer is quite similar to a 2x12 ripped down to 2x6 dimensions, but with some extra bits above which hold our treads where we want them...
But contractors always build stairs this way, and I would like to accomodate them... so any advice would be appreciated.
Cheers!