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Old 03-25-2012, 08:49 AM   #1
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Load strength of 6x4 posts


I want to install a firepit on top of a deck. If i use 6x4 posts 3' a part in a square, tie them together with 2x6 runners and joists, how can i calculate how much weight that will hold?

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Old 03-25-2012, 11:07 AM   #2
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Load strength of 6x4 posts


I think I understand, but your question makes me wonder. Are you using the 4x6's in a vertical position, as posts in the corners, then wrapping with 2x6's to form an enclosed box, then installing floor joists on the inside of the top? If that is the case, the load will go into the joists and how they are attached will be the questionable factor. As for the 4x6's, you could stack a car on the ends of them. What is under them will crush or give out. So, what is under them? You said this fire pit is on a deck. Are the joists under that area doubled up or reinforced with a post underneath? That will be your next load factor, not the posts.

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Old 03-25-2012, 10:44 PM   #3
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Load strength of 6x4 posts


Weight of the fire pit? If this sucker is going to flatten a one-ton pickup, then you calculate your loads and needs by writing a check to an engineer. Some things are not entirely diy. Let him/her do the calcs, you do the building. It is often cheaper that way.
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Old 03-29-2012, 11:21 PM   #4
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Load strength of 6x4 posts


Quote:
Originally Posted by TJ Thomas View Post
I want to install a firepit on top of a deck. If i use 6x4 posts 3' a part in a square, tie them together with 2x6 runners and joists, how can i calculate how much weight that will hold?
You need to specify a little more what exactly is going to happen.
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