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