sparr t1_is67s50 wrote on October 13, 2022 at 4:25 PM

Reply to comment by --Ty-- in 10x20 Shed base materials. by EnuqieuEsur

Random 10x20 plans, first google result I found: https://myoutdoorplans.com/shed/10x20-shed-plans/

No center support. Why would you need a support in the middle of a 10ft span?

CasinoAccountant t1_is6fnk8 wrote on October 13, 2022 at 5:16 PM

well you might consider it, if the goal was to do it right the first time.

--Ty-- t1_is6l8ep wrote on October 13, 2022 at 5:52 PM

Those floor beams are spanning 20 feet, not ten. The joists are spanning ten, but since there's four beams beneath them, the span is reduced to 35 inches. The beams, however, are spanning the full 20 feet. If you just put a concrete block at each end, that's literally 18 feet of span.

In any case, even if it was only 10 feet deep, 4x4's can only span about 6'6" or so. 4x6s can technically span 10', but you'll experience a considerable amount of sag.

sparr t1_is6ner1 wrote on October 13, 2022 at 6:06 PM

You're right, I didn't scroll down far enough. I only saw the higher illustration showing 10ft clear spans. It looks like that style, with four 4x4s under the joists, is really popular today. Every shed around that size I've ever built or owned or rented has had 2x6 or 2x8 for the 10ft span floor joists, without a center support, but they were all built 20+ years ago.