Buy sturdy rope nylon or polyester based.
How to secure a mattress to a roof rack.
I am planning to strap the box springs to the roof rack on my rav4 and tie them down with a bunch of rope.
Center the mattress in the middle and put the rope over the length of the mattress.
Ratcheting straps are much less likely to fail when moving a bulky item like a mattress.
I would say follow a similar process to what ryan said but i would not recommend using rope.
The wind from the roads or highway can easily rip through the plastic if it is not properly secure.
If you purchase a new mattress to take home or are in the process of moving the mattress should be thoroughly tied down to prevent it from flying off the roof of your car and endangering other drivers.
Any item that exceeds the recommended weight limit choose another hauling option like a trailer.
Toss the first long piece of rope over the length of the mattress.
If you do secure your mattress to a roof rack or safely in the bed of a truck strap it down with ratcheting straps.
Place the mattress on the roof making sure it s in the middle.
A simple ratchet strap works best.
I am going to pickup a queen size mattress and box springs and my dad is going to take the mattress part in his van but the box springs won t fit in his van because they don t bend like a mattress does.
Still there is a basic method to follow when tying a mattress to the roof of a car.
This will stress any knot no matter how securely tied.
A ratchet strap ensures that the mattress will not flay away while driving especially if you do not have a roof rack.
Prepare to secure your load to the roof rack.
Mattresses are large bulky and can pick up resistance from the wind.
Secure the front end of the mattress and then the other end of the mattress.
Your owner s manual should say how much weight you can carry on the roof.
Before securing the load to the roof of your car evaluate the item you will haul.
Secure your mattress to the top of the car.
Put a piece of rope on the roof of the car that goes from back bumper to front bumper.
Put the mattress on top of the car and rope so that it goes length wise with the length of the car see pics above.