I transport 4x8 plywood on my roof racks i usually run a couple of 2x4s under the roof racks the full length of the ply and strap to those at the front and back as well as strapping to the actual roof racks.
How to attach wood to a roof rack.
On a roof rack step 1.
What types of tie downs work best.
Oh and remember to.
A pair of 20 web ratchets used as a fail safe in case the board slides to the rear of the vehicle.
To attach the metal braces to these blocks i cut a section out of each side of the blocking a curved fashion using the same method of incremental 1 8 cuts using the table saw fence.
4 web ratchet straps in a pair of x formations to hold down the board to the cross bars.
Remember to place a distance of about 3 to 3 foot in between.
Second trip 16 2 x4 x6 boards on my roof rack.
Ask for help from friends if.
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.
To attach the four saddles to the rails i again used blocks of oak similar in size to the roof rack blocks.
Makes it a lot harder for the winds to lift it up.
Secure it to the roof rack.
It will be adjustable to a range of angles depending on the shape of the kayak bottom.
Rusticdavid woodworklessons woodworkingforbeginners david shows how to tie wood boards and sheets of plywood safely and securely to your cars roof rack dav.
My car with roof rack with cross bars installed.