I'm new to these forums and I'm a new home owner. I've been in this home for ~6 months. It has a shop/shed in the backyard that is at least 10 years old (couldn't find the records) that is in need of some repairs; mainly, replacing the siding, the door (bottom is rotted), and the roof. I have some ideas on how to fix the first two but am seeking advice on the roof.
As you can tell, the roof sags in the middle and the two long walls (the structure is ~20 ft x 40 ft) are being pushed out slightly so they are out of plumb. The reason is obvious in that the roof has rafters but no horizontal joists, as seen from these images:
Here are some additional pictures of the rafters:
I figure the roof structure needs horizontal joists to keep the roof level and to keep the roof from pushing the walls out.
My question is is there some way to "jack" up the roof and install horizontal joists to repair the above problem? If so, is this something an individual can do with limited experience or do I need to hire a roof contractor?
Thanks for any help,