Insufficient Trusses/rafters?

[Happyg]

Hi,
I just bought a 1941 house and it has a detached garage. I want to finish out the garage, but the trusses (or lack thereof) make me wonder if this is possible or what I need to do to be able to do it. The first picture is of a missing? truss board. The second picture show that the trusses look like they are baseboards?, and you cab see the problem sagging rafter on there, too. The wood on these is all different. The third picture is from the center to the back, the 4th picture is from the center to the front. The trusses look OK in the front, I think. The back 5 feet of the garage are framed up with boards that run perpendicular to the sagging rafter. There is drywall on there already. I don't know who to ask or where to start on this. Please point me in the right direction.

 

[Happyg]

Here is that 4th picture.

 

[nadogail]

I am guessing that the garage has stood for 80 years, witch should tell us something about how well it was built.

The builders of the garage presumably learned their skills in the great depression and very probably built with what they had.

Your house and garage is two years younger than I. Don't try to fix what isn't broken.

P.S. Welcome to the forum.

 

[Happyg]

Thanks for the welcome!
The issue is that I want to finish the garage and insulate it. Since the rafter is already sagging, I don't think that the 80 year old depression era structure was built with the structural integrity to handle a few hundred extra pounds of drywall and/or plywood and insulation.
How do I go about strengthening the existing structure? Do I need to add diagonals to the existing rafters? Jack it up and add a pole(I do not want to do that, but it would solve the problem).
I am looking for solutions to the problem, not someone to pat me on the head and tell me to leave it alone.