It really depends on who is going to be fixing the roof.
Roof jacks on existing roof.
You can usually feel sheathing nails which are driven into rafters through the underlayment attach a jack by driving two 16d nails never roofing nails into a rafter.
As roof jacks are easy to set up and remove they are ideal to use on various types of roofing project.
Placing the first roof jack.
Determine the best place to fasten your first roof jack.
I came across this steep roof and took this video about installing the roof jacks and the board before installing the roofing materials.
Secure the new roof jack to the roof decking with roofing nails.
Slide a new roof jack sized to fit your vent pipe over the pipe.
For many people out.
Pry up the old jack and remove it by pulling it up over the vent pipe.
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Ideally locate a rafter below the sheathing.
Cut roof shingles to fit around the roof jack and insert them under the existing shingles.
How to use roof jacks on existing roof.
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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