Corrugated Paneling Overlap

enggass

Songster
10 Years
Mar 8, 2010
1,683
64
231
Mid-Coast Maine
When installing, should there be a screw/nail in the crest where 2 panels overlap? I have the Tuftex, but it does not say whether or not there should or should not be a fastener at the overlap.
In the diagram f the directions, it looks as though it does not, but they don't mention it either way... If not, should it be sealed?
Thanks.
 
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