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--Ty-- t1_is6l8ep wrote

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

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.

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sparr t1_is6ner1 wrote

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.

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