Tie down straps straps with cam buckles can be ideal for this as they have a secure buckle for tightening without needing to tie knots.
How to tie a kayak down on a roof rack.
This can shut down the strap and safeguarded your kayak towards the roof rack club you re focusing on.
Make sure the foam pads are secure.
You will usually need two straps one for each crossbar.
Tie the straps down with cam buckles to secure the kayak.
Ensure the straps are laying flat against the kayak and that they are not crossed.
To tie down a kayak place it right side up on your roof rack and center it.
Run the bare end from the strap from the cam buckle.
The type you use will likely depend on your vehicle and your personal preference but it can be useful to have crossbars to secure your kayak.
To install wrap the pads around your crossbars and secure in place.
Load the canoe onto your crossbars.
Mount the foam pads onto your canoe mount the canoe onto your crossbars.
Then slide each strap so that the buckle lays against the hull of the kayak.
You will need four straps if you also choose to use them for the bow and stern tie downs.
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.
Roof rack roof racks will vary between brands and types.