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.
How to tie lumber on roof rack.
Then secure the front and back ends of each lumber bundle with ratchet straps to prevent movement photo 1.
First loop the strap under the roof rack s crossbar and drape the loose ends over your oblong load i e.
Oh and remember to prepare two other pieces of wood for later use.
You may need a pair of extra long straps for that part.
Wood says side rails and crossbars are ideal but you can move whatever you you need to without them.
Secure it to the roof rack.
Remember to place a distance of about 3 to 3 foot in between.
On each side of the roof you ll see a rack that runs the length of the roof of the vehicle.
To avoid contact between the hook and the frame tie a figure 8 loop in the strap two feet from the hook run the hook end through the door frame and hook it onto the loop.
Ask for help from friends if the sheet is too.
Next secure the load to the rack using ratchet straps photo 2.
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.
Load your sheet of plywood on the roof rack.
That prevents the bundle from sliding forward backward or side to side.
Start by loading dimensional lumber onto the rack with the narrow edges resting on the crossbars.
Next pull the long end of the strap under the crossbar on the.
Attach a ratchet strap to a rear anchor point on one side of the bed and lay it across the end of the bundle to the rear anchor on the other side.
If you have a small load of lumber then you won t have to do anything complicated.