Building 4 sections would result in double joists, which would be overkill. Just build the floor as one unit and properly support it at your intervals.

I always screw joists together using quality square head screws, such as McFeeleys.

How do you recommend supporting the 12' span of joists from the bottom? Toenail a 2" x 8" sill plate underneath that is resting on the middle row running the length of the shed?

Thanks for the advice.

So you are going to have the floor unsupported by stone in the middle? Your idea of a 2x8 sill running perpendicular is a good one. You could support the sill by block or stones.

Maybe you already are doing this, but I would lay 4 mil plastic on top of the soil before doing any work. Then cover it with stone.

Well, I didn't end up getting to start the shed project last fall, so I'm gearing up to get started.

Some people are telling me that I'm crazy to not go with a concrete floor/slab. I checked into pricing with a place that does all of the concrete work and it would cost $4,800! That's beyond my budget, but I'm wondering how difficult it would be to make some forms for the slab and have the concrete poured and smooth it out myself.

Is this type of thing feasible for someone that doesn't have experience with concrete? From the highest point of the ground to the lowest point is about a 20" difference (gradual slope diaganolly). I was thinking I could build the form up about 4" from the highest point and then of course make it level all the way around.

Would there be frost heave concerns having part of a concrete slab be thicker than the rest of it? Should I just stick with the blocks and the wood floor?

Thanks for the guidance!

One other thing I noticed is that if I feather the throttle I can keep it running longer...but it does eventually die.