• Welcome to The Building Code Forum

    Your premier resource for building code knowledge.

    This forum remains free to the public thanks to the generous support of our Sawhorse Members and Corporate Sponsors. Their contributions help keep this community thriving and accessible.

    Want enhanced access to expert discussions and exclusive features? Learn more about the benefits here.

    Ready to upgrade? Log in and upgrade now.

design load for a built up spf wood post

B

bgingras

REGISTERED
Joined
Jan 6, 2010
Messages
184
Location
Massachusetts
Maybe it's somewhere in the book and i'm lost becuase it's the end of the day. I have a project that came in with 7,100lb loads on built up double 2x4 SPF wood posts...seems a bit high. Is there any place in the code that shows the allowable design load for wood posts?
 
You won't find a column table in the codebook. Can anyone explain why? This is an AF&PA publication; check chapter 3 in the right hand column on this page;

http://www.awc.org/standards/wsdd.html

Probably a good bit high. One way of looking at it quickly, the end of the column is 10.5 square inches... 7100/10.5 =676 psi, even if it's mighty short it'll likely crush into whatever is bearing on it.
 
Last edited by a moderator:
Depends on how tall, which way (and if) the sheathing braces it (parallel or perpendicular to grain), a beamcheck program can help with this....I had a homeowner trying to post a huge LVL (24,000#)onto a built up post, called them on it at review, went to the lumber yard and speced a PSL post....I said now what about the sill plate? We really should not have to check compression perp. to the grain on a SYP plate.....thats how I know people have no clue what they are doing!
 
posts are 9' tall, I doubt they planned to nail through the sheathing since this is a dormer addition and the siding will remain. We are talking about transmitting the lods all the way to the basement through 2 stories. I suspect engineered posts and other specs will be needed.
 
Braced in both directions it is close w/ 9' #2 spf 2 ply....would need dead, live, and alot of other info to do it properly....and then the crush of everything in between...
 
I'm giving it back to have a RDP specify everything to the foundation. The lumber yard simply gave him the clacs for the LVL, which was 6" wider than he claimed was needed on the first go at getting a permit.the clacl sheet showed the end loads at 7100 per end with 3 1/2" x 3 1/2" bearing. The LL is 11600, DL is 2600.
 
You must log in or register to reply here.
Back
Top