Ideally locate a rafter below the sheathing.
Roof jacks on existing roof.
I came across this steep roof and took this video about installing the roof jacks and the board before installing the roofing materials.
Slide a new roof jack sized to fit your vent pipe over the pipe.
For many people out.
Secure the new roof jack to the roof decking with roofing nails.
Roof jacks provide a stable surface to work increasing safety and making it easier to apply roofing.
Here is the list of steps on how to use roof jacks in order to get it installed and worked properly while you work.
Others often prefer to place the first one at the edge of the roof.
Placing the first roof jack.
How to use roof jacks on existing roof.
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It is usually placed on the fourth or fifth level of the rows of shingles depending on how comfortable you feel on either.
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It really depends on who is going to be fixing the roof.
Determine the best place to fasten your first roof jack.
Pry up the old jack and remove it by pulling it up over the vent pipe.