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Author Topic: PT Lumber suggestions  (Read 1018 times)

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Offline John Mc

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Re: PT Lumber suggestions
« Reply #20 on: March 22, 2019, 09:27:12 AM »
This is a structure I put up this last fall. The posts are 6x6s built up from full size 2x6s. I had the treated 2x lumber (.60 CCA ) done quite a few years ago. One of the nice things of doing it this way, is the posts are able to be made to any needed length.


(Image hidden from quote, click to view.)


I have a couple structures built this way that are over 35 years old, with no signs of twisting or racking.
What did you do at/in the ground? I can't quite see it in your picture.
Building up from 2x6s is supposed to be stronger than using a 6x6 (other than perhaps at the joints)
If the only tool you have is a hammer, you tend to see every problem as a nail.   - Abraham Maslow

Offline Don P

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Re: PT Lumber suggestions
« Reply #21 on: March 22, 2019, 09:49:27 AM »
better qualify that. In the strength direction of the nail laminated plies the wood is stronger because of the distribution of defects, repetitive member increase and dimensional vs heavy timber strength. The nailing, splices and splice length factor into the actual post strength of a spliced post vs an unspliced post. But, nail lam was developed for sheathed buildings. When you use it for a post in an open building now the flatways plies are bending out of plane. That is substantially weaker. So they suggest well nailed cover boards over the ply edges to put wood in bending across its strong axis when the posts are used in an open building or for internal posts. The nailing pattern is tight in all of this. Google David Bohnoff, nail laminated posts, for more than you ever wanted to know. He has been making and breaking these posts for about 30 years.
A laborer works with his hands
A craftsman uses his brain and his hands
An artist uses his brain, his hands, and his heart

Offline John Mc

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Re: PT Lumber suggestions
« Reply #22 on: March 22, 2019, 11:12:33 AM »
Good point, @Don P 
If the only tool you have is a hammer, you tend to see every problem as a nail.   - Abraham Maslow


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