Jacking Up Roof Rafters

Use the link below for wall framing instructions.

Jacking up roof rafters.

Move the jack in increments of one inch to allow for the roof to be able to move with it without cracking. A rather simple method of jacking up ceiling joists to take sag out and putting in support lumber. While some of the issues can be fixed easily by adding struts jacking up some loose rafters or replacing shingles and sheathing other problems will require a much more serious solution which will require an experienced expert to work on it. To install the new rafters i will have to remove the deflection of the existing rafters so the new ones will fit and properly carry the roof load.

Now take your jack and jack up the ridge. Jack up until level the frame a wall 16 on center between the 2x4 s that will serve as the top and bottom plate. However the trick to this process is to do it very slowly so it may take a few weeks before you get the rafter into a position where it is straight again. I can jack against the ceiling joists over a bearing wall below.

I am tempted to install the new rafters with the crown down to reduce the jacking required. However this should be done very slowly and carefully. Straighten rafters can be done easily by jacking them one over the other. You may do this 1 per day and roof rafters can handle more stress.

The easiest way to straighten rafters is to jack them into position.