This step can be done for both the front and back strap of the canoe one for each roof rack bar.
How wrap a suv roof rack.
Open the rear doors and run a ratchet strap over the top of the rack and through the rear seat area of the passenger compartment.
In the case of a naked roof you should be looping the rope through the car through the doors not the windows and around the object on the roof and a towel or blanket should be used to protect the roof of your car from the object.
Wrap lumber in a tarp to secure it and place a blanket down on the roof under the load to avoid scratching your vehicle s paint.
If you have side rails and crossbars the straps can be looped around those.
Then wrap this strap around both crossbars and tighten.
Hook a ratchet strap to the front bundle strap.
Tie down the boards lengthwise and widthwise similar to how you d secure a mattress.
Do this for both the front and back strap.
Secure the rack to the vehicle.