It's been discussed that ply is a cheap shed covering (if you don't mind the look), but I've seen few guides on how to do it. I've put ply in the garden and it's peeled, so I'm pretty certain it needs treating, but with what? Also, are there any rules I need to follow in construction? I'm intending to nog the joins, should I place the sheets vertically or horizontally? Do I need to do something special where two sheets butt up against each other? Should I cap the corners in any way? Or is it just a case of plenty of treatment and hope for the best? Also, what fixings should I use? Thanks.