Use a tie down that wraps around the item and the rails.
How to attach something to a roof.
This video is about all surface roofing construction.
What types of tie downs work best.
If you still want to attach something to your roof call exterior remodel design for our team of roofing professionals to help you with your projects.
On each side of the roof you ll see a rack that runs the length of the roof of the vehicle.
A professional will attach your shade sail to your roof at the soffit under the lower structural edge where it is safe.
If you plan to install a camera on your roof or install a dish on a shingled roof surface you may need to use nails which create holes in an otherwise waterproof surface exposing the entire structure to moisture problems.
With the third option crossbars with side rails you can secure an item to the side rails and run tie downs from front to back securing them to the crossbars.
It s a much better idea to attach a shade sail to your other backyard structures such as your gazebo or trellis.
If you have side rails and crossbars the straps can be looped around those.
While this might work in some situations unless you keep the shingle flat against the roof and ensure the nails are at the correct depth there may not be enough support to hold the weight of your item.