Use a tie down that wraps around the item and the rails.
How to attach something to roof of car.
When you are tying things down to the roof of your vehicle each.
Wood says side rails and crossbars are ideal but you can move whatever you you need to.
Step by step instructions for tying items to a car roof follow the directions that come with your products.
Avoid the scraping and gouging with fasteners from the perfect bungee which has an impressive array of cords with tough gentle hooks and loops of molded nylon and polyurethane.
If you have a roof rack the straps ropes can be looped around the side and cross rails.
Tie down the boards lengthwise and widthwise similar to how you d secure a mattress.
Consider a roof rack.
Buy a small sheet of dark gray or black plastic at a hobby shop and cut out about a 6 inch square.
When you have to tie something down to the roof of the car to a wall of the garage you sometimes need a bungee cord without a rough metal hook at either end.
Assess your rack situation.
How to tie things to the roof of your car acquire ropes and straps.
Then on one side stick self adhesive strips of hook and loop fasteners velcro hook side only.
On each side of the roof you ll see a rack that runs the length of the roof of the vehicle.