So I've gotten myself a tin shed. Right now Im keeping tools, straw and my chicken feed in it, however I'm Hoping to make it into a hen house for my chickens sometime soon before the winter settles in so they have more room. I've gotten it up & cemented in but theres one problem, It has a flat roof and water leaks through! So I'm looking for a cheap and easy way making the roof somehow slope or another way of keeping the water out WITHOUT letting too much draft in. Heres a couple of pictures of my shed---- Any suggestions? Thank you.