Most include the necessary tie downs as well.
How to tie a canoe to a roof rack with rope.
You might need somebody to assist you to pick it up.
Run 2 boat straps over the top of the kayak and them under the roof rack bars then bring the straps to the other side of the kayak and loop them under the roof rack bars on that side.
To tie down a kayak place it right side up on your roof rack and center it.
Using rope or another set of cam straps loop one end of the rope or strap through the carrying handle or a suitable loop on the bow or your kayak and the other end through a tow hook on your car.
There are multiple styles of carriers available.
Tying your kayak for the roof rack.
If it is slightly off line the wind will be putting uneven pressure on one side of your boat the entire drive.
Tie the straps down with cam buckles to secure the kayak.
Pick up your kayak onto the roof rack on your car so it is right side upwards.
For added safety it can be a good idea to tie down your boat at the front and back of your vehicle to help prevent it from becoming a projectile while on the road.
To carry your canoe on a roof rack you ll need a carrier designed for this use.