I just bought a home built in 1922, and the first thing I need to do is repair a sagging roof, which is sagging due to a cracked ridge beam. I use the word "beam" tongue in cheek, as the thing is just a 1 by - not much of a beam. After reading my initial thoughts, I'd really appreciate any help I can get - advise away!
My initial thoughts are to slowly jack the ridge board up until all is level (looks to be a 3" to 4" sag). I'm thinking I should do it slowly, say a inch or so per day, so I don't cause other problems with the sheeting and rafters. After getting it jacked up and level (using a 2x6 under the ridge beam and a 4 ton hydraulic jack), I'm thinking I will permanently support this area with posts from the 2x6 to the ceiling beam beneath it. Then I think I should sandwich the cracked area with glued and nailed plywood patches between the rafters. Then I think I should probably add ties on the rafters - will 2x4 ties work? I welcome all thoughts and suggestions.