Building a shed - plywood questions

Hey folks,

I'm building a shed to store my motorcycles in until I have time/money to build a proper garage. The flooring will have to support my 3 bikes, as well as my boyfriend's, so... approximately 2000lbs.

I've designed the subfloor with 3 pressure treated 4x4x12 skids, and then 12 pressure treated 2x6x12 joists. What kind of plywood is best to use for a strong floor? I've been looking at a T&G OSB Subfloor with a 23/32" thickness.

*** Is that good, or is there something better (or that is a better value)?

On the sides: I'm torn between using Plytanium siding and just normal plywood. If I use the Plytanium, do I need to put normal plywood beneath it. (I don't think so, but want to verify.) If I use normal plywood, what is the best kind? I assume A or B grade, but... thickness? OSB or...? Whichever I go with, I will end up painting it.

And, finally, the roof. I plan on putting on a shingled roof. What kind of plywood can I use under that?

I live in AZ, so materials have to be good for hot, dry conditions, if that makes a difference.

Also, what's the best way to cut plywood? For the most part, my design accomodates using the whole 4x8 sheet, but on the front, I'll be having to rip the boards. I have a great circ saw, but... would it be worthwhile to borrow a table saw for this project?

Thank you in advance, everyone, for any assistance you can offer!

 

I would use Advantec or 3/4 in. treated t&g plywood.

1/2 in OSB for the roof sheathing.

Mark the sheet goods with a chalk line and cut with your circular saw.