For plywood i put two 2 x 4 s on the roof rack and place the plywood on top of those to stiffen the plywood otherwise it flops up and down at highway speeds.
Tying lumber to roof rack.
Use a tie down that wraps around the item and the rails.
In case you have no idea how much weight your plywood sheet is a sheet of inch plywood is approximately 100.
Then i use the nylon web tie downs i ve got in the photos of below.
Oh and remember to.
I use 4 hand clamps at the corners to hold the plywood to the 2 x 4 s.
Here i have the bicycle s handlebars firmly planted on the roof rack s cross bar in the.
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.
Not only that but the cost of a roof rack is easily 5 10 times more expensive than a one day truck rental.
On a roof rack step 1.
The second option is the side racks.
With anything you plan on tying down you ll need three preferably four solid points of contact stability.
If you have an suv and need to haul lumber often a trailer would be a better option than a roof rack.
Ask for help from friends if.
Remember to place a distance of about 3 to 3 foot in between.
For infrequent use though truck rental is a better option.