Sagging rafters are a sign that a house is in serious trouble.
How to jack up a sagging roof 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.
Prevent this unfortunate series of events by bracing your rafters to make them sturdy and resistant to snow loads and wind.
If required you will need to use something that forces up the roof while you are working the new beams into the right place and fastening them securely.
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.
Jack up until level the frame a wall 16 on center between the 2x4 s that will serve as the top and bottom plate.
Work along the beams gradually taking care to push up the roof while you work.
Then lower the jack down a little at a time so that the metal can take the weight of the roof.
You may do this 1 per day and roof rafters can handle more stress.
Place the jack back underneath the beam but this time under the iron piece.
Drive the remaining carriage bolts into the two by six rafter and tighten them all up.
If these already exist nail a 2x4 to them directly under the 2x4 plate you nailed down before.
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.
Make sure that while you work you push the roof upwards.
Now take your jack and jack up the ridge.
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.
If necessary jack up any sagging at the ridge.
All of the sagging will be lifted up gradually.
When sagging gets too severe it can lead to roof collapse and once the roof goes the house won t last for long.
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