On 31 Dec 2004 16:47:52 -0800, someone wrote:

rot would be the only reason to replace the plywood. This could be due
to water damage. The roofer would have replaced any wood that he could
not nail to.

Not they they wait until they are nailing 'em on to say "gee this spot
doesn't hold nails". When the tear off the old shingles, the step-on
(does it seem "soft" when stepped on) and visual check will tell them
where they want to replace, before they are actually nailing shingles
to it.




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