Ideally you should find the rafter first underneath the sheathing locate by feeling the nails.
How to install roof jacks.
Roof jacks make it easier to set roofing and increase safety for you by providing stable surface.
Determine placement determine the best place to fasten your first roof jack.
Install middle jacks under planking once they are put down so you can locate the middle for added stability.
How to install roof jacks step 1.
Make sure to examine each driven nail and test each roof jack before placing any planking on top.
Nail the new shingles down with roofing nails so the nails are covered by the shingle above.
Use a hammer to bend the top edge of the soft lead roof jack down into the vent pipe.
Middle jacks will help when extra material is loaded on the roof or when workers need to walk from spot to spot.
The front end of the base goes under the shingle just above it and you drive a 3 inch nail through the hole at that end.
Prepping installation carefully place a ladder by the side of the roof and make sure that it is stable and.
Then attach the tool into rafter by driving couple of 16d nails.
Each jack has a flat base with a series of nail holes.
Cut roof shingles to fit around the roof jack and insert them under the existing shingles.