JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.

You are watching: How much weight can a 4x4 support vertically


I put up a shed supported by 4x4 posts and noticed a good amount of vertical cracking in the supports. At first this scared me as I thought maybe I had too much weight and these were stress cracks. But then I got to looking at some various decks, fences even went to the lumber yard and noticed the same type cracks in all the dried 4x4s I found.This still got me thinking tho... How much load can a vertical 4x4 support?
If you correct your mind, the rest of your life will fall into place ~Lao TzuSalmonFallsCabinetry.comSalmon Falls Cabinetry on Facebook
What I figured if the weight is distributed evenly is that each 4x4 post is supporting a max of about 420 pounds. Thats about 3 of me and I cant imagine that weight being a threat to a vertical 4x4... even a horizontal one with a decent span.
A 4x4 in good condition, if held in a vertical position, can take thousands of pounds of pressure. The cracks you"re seeing are likely just drying checks.
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
A 4x4 in good condition, if held in a vertical position, can take thousands of pounds of pressure. The cracks you"re seeing are likely just drying checks.
*

It is roughly 4,300 LBS for the entire post. This can vary by species but they can support a lot of weight.
Although "varying by specie" is VERY true and something to be considered when you get outside the "norm" of standard framing product ... the rule of thumb would be 500lbs. per square inch of material = end grain carrying capacity. Thus a 3 1/2" x 3 1/2" piece of material is 12.25 sq. inches of material = 6,125 lbs. of end grain support. I would use this number up till the point that member reached 8" of vertical hold without diagonal bracing. If the 4x4 were used in a shed with rated sheathing on the exterior wall surface ... the original number will hold.

See more: Pa In What Episode Does Naruto Fight Pain, Where Are The Episodes When Naruto Fights Pain

As far as the "cracking" that you view ... it"s called "checking." Very common in all materials 3" thick or thicker. I do a lot of post and beam construction and it"s one of my many headaches trying to explain to HOs that have exposed beams and see this happen. I"ve had them ask "how do you fix it" ... my general response is "that"s lumber ... that"s what it go ... and quite frankly, those that truly "love" timber ... enjoy every bit of character it add to ... speaking of character ... I threw that in for free." Most times they just laugh and understand.