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.
Strapping lumber to roof rack.
Use a tie down that wraps around the item and the rails.
4 web ratchet straps in a pair of x formations to hold down the board to the cross bars.
Then secure the front and back ends of each lumber bundle with ratchet straps to prevent movement photo 1.
Which is why we spoke with jonny wood one of yakima s four road warriors who travel around the us educating the masses on how to properly rack up their vehicles and asked for some advice on how to properly secure a load to a car s roof.
Tie the load to the roof racks with nylon straps that have self clinching buckles.
Next secure the load to the rack using ratchet straps photo 2.
That prevents the bundle from sliding forward backward or side to side.
Thread the strap end through the buckle and pull.
Second trip 16 2 x4 x6 boards on my roof rack.
On each side of the roof you ll see a rack that runs the length of the roof of the vehicle.
My car with 4 x8 mdf board on the roof rack.
A pair of 20 web ratchets used as a fail safe in case the board slides to the rear of the vehicle.
Acquire ropes and straps.
Wrap the strap around the load and under and around each rack.
The second option is the side racks.