They re also adjustable very user friendly and best of all stand.
Putting lumber on a subary roof rack.
It s better to use racks.
When i say loop around i mean one full turn around the lumber.
Tie down the boards lengthwise and widthwise similar to how you d secure a mattress.
Last resort if needing lots of whole sheets would be the roof rack.
If i were to need to carry that much regularly i would build a simple rack to make life easier.
Wrap lumber in a tarp to secure it and place a blanket down on the roof under the load to avoid scratching your vehicle s paint.
Wood says side rails and crossbars are ideal but you can move whatever you you need to without them.
One of the things that make the outback so versatile are its retractable roof cross bars.
My car with roof rack with cross bars installed.
I d use some ratchet straps and loop them around your lumber and tie it down to the rack.
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.
Just keep in mind that blankets can mar your vehicle s paint and putting objects directly on the roof can dent it.
A couple 2x4 boards longways with a notched end to prevent sliding in an emergency stop.
A couple boards width ways with a notched end to prevent them from sliding left.
4 web ratchet straps in a pair of x formations to hold down the board to the cross bars.
My car with 4 x8 mdf board on the roof rack.
As someone else suggested putting a piece of scrap lumber infront of and behind the roof bars is a good way of keeping everything secure.
Sans roof racks use a blanket.