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I need to build a simple fire wood storage shed with roof, size of shed 8 x 10 ft.. I will use some concrete blocks for footing, and 2x8 for framing. My question is what size of posts I should consider for such shed, 4x4 or 6x6?

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Either will work. They'll both hold up a conventional roof of that size without issue. Your concern is more a matter of diagonal bracing, especially if the posts won't be in the ground.

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  • I agree but I don’t think I would spend the extra for 6x6 .+
    – Ed Beal
    Aug 13 '19 at 14:27
  • @isherwood, thanks for comment. Do you mean I'd need diagonal bracing to support roof or the posts or both?
    – Mark
    Aug 14 '19 at 12:27
  • The sheathing on the roof act as its diagonal bracing. You need to keep the posts upright.
    – isherwood
    Aug 15 '19 at 17:59
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I have built 3 sheds using two 2X4 at each corner ( two were 8' X 12', one was 8' X 16' and 2 stories). I used 2 X 4 on 16" centers and 1/2 " plywood walls. None fell down or blew away. All were set on flat concrete or cement blocks. The compressive strength of southern pine is about 13,000 psi so using a design value of 5000 psi appears safe. As noted you do need some structure/diagonals for stability for loads from various directions.

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  • I was under the impression that there are no walls since you normally wouldn't use posts in that case. It's just a roof. Would you still recommend 2x4s?
    – isherwood
    Aug 15 '19 at 17:58
  • I see , just a roof over firewood. Diagonal bracing is going to be more important than post size. Aug 19 '19 at 14:15

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