I recommend using bailing wire rather than bungee cords. And if you can't get any bailing wire then by all means go to the fall-back of bubble-gum as an adhesive/sealent and bailing twine as your securing material. Have you considered using duct tape?

Okay now that I've gotten the sillies out of me concerning your predicament I should like to offer a bit of serious advice.

In days of old, in those countries where wind played havoc with keeping ones roof on, the locals would place rocks on top of the roof to help in keeping it down. Each rock was usually about 7 to 14 lbs each and there would at least two or three to each roof pitch.

Oh!!! And make sure you put a wedge under them or with vibration the rocks will slide off the roof and knock someone in the head.

Duct tape! Its so obvious i should have thought pf it myself. I will put the rocks on as well and steal one of those falling rocks road signs in order to warn people. I will also need to custom build a "warning low flying shed roofs" sign but i think the neighbours are already used to it.

NC

It's funny how many people forget about duct tape as a solution to lifes problems. :-)

I was thinking some more concerning your predicament and rather than use large stones (which while being far more attractive are also expensive to procure) you could go to your local builders and get some 4 inch concrete cinder blocks. If you paint these the same color as your roof and lay them flat then they will be quite difficult to see unless your really looking. And, laying them flat would preclude having to wedge them as the square area making contact with the roof would provide more than sufficient friction on a normally pitched roof.

Anyway... I hope this helps.