How to build a wooden shed?

[mikebarker]

Hi all, I am about to build a small wooden garden storage shed (3m wide x 2.4m deep) on a gravel base. I have been soaking up tutorials, reading the various excellent posts on this forum and on wooden framing and feel fairly confident about most stages but there are a few grey areas that I would love the community guidance on (and will likely lean on you for tips along the way!).

I previously prepped the ground and laid a gravel pad. The plan is to put 2 x 6 treated joists directly into TuffBlocks as the base of the shed and build on top of that.

So my questions are:

Flooring

1. I am looking at treated yellow tongue STRUCAflor is this suitable or is there a better alternative? Treated plywood looks very expensive but I don't mind paying if it means increased longevity.

2. Silly question, but given the fact an exposed tongue in these boards will be at one edge of the shed. Do you just cut these off or just fill the gap with sealant?

Walls

1. What options do I have for external wooden wall panels? I would like something that looks nicer than particleboard or OSB. Is there an outdoor option of these slotted panels? I guess I could use weatherboards but curious at alternatives.

2. Should I use building wrap?

Roofing

1. What are my options here? Just colourbond sheets? If yes, should I still put a plywood/OSB roof on and apply the colourbond to that or just attach it straight to the rafters? I assume I would have lots of gaps if I attach directly to the rafters.

2. If colourbond is the way to go, I'm curious to know what you use so that you don't just have sharp raw edges and what to use for the apex of a pitched roof?

Fasteners

I'm going to use screws instead of nails for framing (Personal preference, if I had a nailgun it might be different 😄). So I don't want to have to pre-drill or anything. What gauge is best, 12g? or thicker? Something like these Buildex RapidDrive Treated Pine Screws 12g x 75mm?

I think that's all I need to know at the moment, once I have these answers I can make my materials order and get stuck in!

Thanks so much

[mikebarker]

Thanks @MitchellMc that tread looks good also.

@Dave-1 Ha ok, I'll do eves 😅 where do you attach soffits? To the rafters on a diagonal? I have those fascia boards with the indentation at the top and bottom for (I assume) soffits but then:

A. What do I attach them to?

B. There is a huge void left as the soffit is so low down, or is that ok?

See here

Soffit diagonal

Soffit using slot in fascia

[Dave-1]

Afternoon @mikebarker 

Id attach to the rafters, I do know of the slots on the facia but not sure what theyare for. The way I figure it is the facia boards are what the gutters are attached to so factor that in when putting the tin sheet on the roof (I didnt when I built my deck and kinda nervous about when I do)

Also the second photo woul mean you need to install another piece of timber on the wall to support that side of the facia board.

Dave