Ideally you should find the rafter first underneath the sheathing locate by feeling the nails.
How to install roof jacks.
Middle jacks will help when extra material is loaded on the roof or when workers need to walk from spot to spot.
Make sure they are on the joists and not just into the sheeting.
With these instructions you will soon be a pro at installing roof jacks and get your roof done in no time.
Then attach the tool into rafter by driving couple of 16d nails.
A ladder jack scaffold is a cost effective and portable temporary scaffold system.
You can fastenen them with with nails or heavy deck screws but 16p nails is what i use.
When i m done i just drive the nails down flush tar over them with roofing cement.
Slowly go up the ladder to check if you are able to reach the sloping portion of the roof.
Install middle jacks under planking once they are put down so you can locate the middle for added stability.
Make sure to examine each driven nail and test each roof jack before placing any planking on top.
It is often used to perform a variety of activities such as installing building exteriors or painting exterior trim.
Roof jacks make it easier to set roofing and increase safety for you by providing stable surface.