Hello Wondered if someone can help me I have a shed that needs a new roof as the felt started leaking and was going to use galvanised sheets. The run of the roof the direction the sheets will lay is 8’ and it’s a pent roof. I gather the guttering needs 70mm overhang but does the higher side need an overhang also? The sheets need to be cut to size and they are expensive so don’t want to find they are the wrong size ♀️ I’m not going to be installing it myself but do need to get all the materials for the job. Pic of shed for reference Thank you!