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It depends on which type of finish that you have, bare, painted or granular and where you are wanting to hang them. If you intend to do this annually, you should get some stainless steel straps which can be painted to match the roof colour and then stich screw them to the metal in a uniform out of the way place. Use a butyl tape to isolate the strap from the metal and install the screw through this. Stich screws are designed especially for this purpose and are usually #14 or bigger in diameter with low angle threads. Check with the manufaturer of the roofing or go to a commercial metal supply and they should have them.
9/28/2005
Dura-Loc Roofing Systems, Inc.
9/29/2005