Help before building a shed

[Oxymoron]

Hello

I am going to build a shed made of untreated spruce wood, and the instructions show this nice image. What do you recommend I buy? The shed will be painted later, but I am a bit unsure about what the floor should be treated with. Should I also place roofing felt between the floor joists and the concrete slab? All tips are gratefully received.

 

[fribygg]

Tar paper is good; use non-plastic-based paint if you're going to paint the facade. I would recommend slamfärg, but linseed oil paint could also be worth considering for the facade.

 

[Oxymoron]

Syllpapp is good, use non-plastic based paint if you're going to paint the facade. I would recommend Falu red paint, but also linseed oil paint could be worth considering for the facade.

Thanks, I was thinking more about panel and window sealing as shown in the picture above, as well as what the floor inside should be painted in.