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I forgot to say Darrellx - I think the waterproofing you are talking about is in my photo where the roll off section meets the fixed roof ection. If it isnt forget everything I am going to say.
What I have done (well in the process of doing really) is I have left the corrugated end of the fixed section of roof on an up (corrugation finishes high) if that makes sense (as opposed to a down (trough)). The roll off section of the roof is just high enough to roll over the fixed secion by about 150 mm (horizontally) and 25 mm higher. I have just got some rubber material about 50 mm wide and 10 mm thick and I am attaching to the 'up' section of the fixed roof so that when the roll on section comes to it it pushes on it and forms like a horizontal U. For such a simple thing it takes some describing.
I also put what they call cats whiskers (ie the stuff on the mudgaurds of semi trailers) around the roll off section to assist in keeping the dust out. Its damn expensive but works really well - also sweeps the channel clean as the roof rolls.
If you got this far in this tome - good luck
MB
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