Use a tie down that wraps around the item and the rails.
Tying lumber to roof rack.
Oh and remember to.
With anything you plan on tying down you ll need three preferably four solid points of contact stability.
I use 4 hand clamps at the corners to hold the plywood to the 2 x 4 s.
On each side of the roof you ll see a rack that runs the length of the roof of the vehicle.
Not only that but the cost of a roof rack is easily 5 10 times more expensive than a one day truck rental.
In case you have no idea how much weight your plywood sheet is a sheet of inch plywood is approximately 100.
The second option is the side racks.
It s best to use a thinner piece of rope and go through an open door and then shut the doors on top of it.
For infrequent use though truck rental is a better option.
Ask for help from friends if.
If you have an suv and need to haul lumber often a trailer would be a better option than a roof rack.
Remember to place a distance of about 3 to 3 foot in between.
Then i use the nylon web tie downs i ve got in the photos of below.
Secure it to the roof rack.
Here i have the bicycle s handlebars firmly planted on the roof rack s cross bar in the.