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I agree with hayZee, now 6x6's they come in 24'
There is very little structurally that will allow a 4x4 @24'
If you need 24' of 4x4 I assume it's for a horizontal placement then why don't you look at an LVL. It would be stronger and I'm thinking you could get it down to 6 x 1 1/2
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