Jack up until level the frame a wall 16 on center between the 2x4 s that will serve as the top and bottom plate.
How to jack up a sagging roof ridge.
Now take your jack and jack up the ridge.
Prevent this unfortunate series of events by bracing your rafters to make them sturdy and resistant to snow loads and wind.
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Work along the beams gradually taking care to push up the roof while you work.
Make sure that while you work you push the roof upwards.
All of the sagging will be lifted up gradually.
I actually reinforced the ridge board with angled 2x10 s sandwiching each opposing pair of rafters held about an inch low of the sheathing and running just under the ridge board.
Drive the remaining carriage bolts into the two by six rafter and tighten them all up.
Seems to me the dormer rafters should have gone to the rige instead of having that small amount of roof coming down to that beam.
Then lower the jack down a little at a time so that the metal can take the weight of the roof.
When sagging gets too severe it can lead to roof collapse and once the roof goes the house won t last for long.
Place the jack back underneath the beam but this time under the iron piece.
If necessary jack up any sagging at the ridge.
To permit mounting of the roof sag expander first bolt holes are drilled in corresponding positions near mid span for each pair of sagged rafters that are to be pushed apart and back to a more nearly straight position.
Best approach to jack up a sagging ridge i have pushed a few ridges back up by jamming 2x6s under the ridge at 4 to 6 foot centers.
Remove the jack quickly and set the iron onto the entire beam.
I through bolted them with only one bolt on each rafter so they could pivot a tiny bit as the roof lifted over the weeks of 1 4 per day jacking.
I assume the steel you put in is the length of the house.
If these already exist nail a 2x4 to them directly under the 2x4 plate you nailed down before.
