Shed build advice needed

[Craftsman_88]

So I'm getting started on a 12x28 shed that will serve as tool and atv storage during a house renovation. I will be building on skids as the shed will move after the renovation to either another house or a different location on this property. My plan is to build up and tamp area with 3/4" minus road base and then add 4-6" of crushed recycled asphalt over that and roll with vibrating dual drum roller. I've used this method for driveways but never to build on. Opinions?

Next I plan on placing 4x4 pt skids 28" apart directly on the asphalt millings with 2x4 floor joists over top @12" oc with a double layer of 3/4" tongue and groove. My main concern is my harbor freight 72" roller loaded with tools. Again opinions? I am worried about the amount on concentrated weight with the box. Should I be? Thanks guys and gals.

 

[couch67]

Craftsman, I would stick with one layer of 3/4 and upgrade the joists to 2x6 @ 16" centers. Probably less $$ overall and stronger floor.

you are right about the tool box - a lot of weight concentrated at 4 points. It could make a sag in the floor over time if it is sitting between joists (but still not sure about this). I'd just make sure there are joists under (or very close) to the wheels where you are going to sit it.

 

[Craftsman_88]

My plan was 2x4 joists on 12" centers. Think 2x6 would still be better overall?

 

[cdestuck]

If you’re going to have a lot of weight in the tool box, I’d put a 3/4” piece of plywood under the box to further spread out the weight.

 

[terry603]

I would also think 2x6 would be a better choice, since you plan on moving it in the future

 

[kwb]

Use 4x6 or taller for your skids It doesn't take much for a 3.5" pile of stuff to build up and be at the floor joists.

Be sure to put the bevel cuts on the bottom side to make it slide when you go to move it.

 

[Kevin54]

Build the underneath out of 4x4's and screw down T&G treated flooring. Our shed is 12x16, been moved 3 or 4 times, dropped on one end twice, and I could park a tank on it. It has never racked in the times it has been moved. It is setting on a bed of gravel about 12" think that has been compacted and leveled out.