https://www.reddit.com/r/howto/comments/xnt8kp/what_is_the_best_way_to_patch_up_the_roof_of_this/
wood glue/adhesive on inside lined up screw together. Waterproof sealer on edges of external one Paint the external one with roofing bitumen ...

https://www.youtube.com/watch?v=gOEdlxEInG4
Comments64 - How to Easily Felt a Shed Roof The Right Way- DIY - Fixed The Leaking Shed Roof | How To Fix A Leaking Shed Roof | Allotment ...

https://www.angi.com/articles/how-much-will-it-cost-replace-roof-my-shed.htm
The average shed roof replacement cost is $800. Most homeowners end up spending between $300 and $1,200 to replace a shed roof, but prices can jump to $4,800, ...