How much weight will a 4x4 douglas fir post hold?
Other information would be a factor:
How many more 4x4's are also supporting the load, Where it's placement is in relation to the other 4x4's , what is the base (foundation)construction, where is it to be located, how will it be attached, What will it be supporting, what are the dimensions of the area under the load, what are the dimensions of the area to be supported, etc...etc..?
There are alot of factors that would determine the actual structural properties of a 4x4 ....
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