According to Dan Espen :
"John Richards" writes:

A piece of siding in one of the two areas pulled loose within a year of the
installation and the contractor nailed it back up.

I think the simple answer to your problem is
in places where the siding has come lose, use
screws instead of nails. Deck screws should do.

I'd avoid deck screws, the underside of the flat head (cone shaped)
tends to cause the vinyl to distort and the head may slip out thru
the slot. Secondly, most deck screws have at least 1/2" of no-thread,
near the head, which means it won't grip sheathing that well.

There's a variety of screw that consists of a hex (not socket!) head,
with integral washer. One variety (self-drilling/tapping with a rubber
washer) is used for sheet steel roofing.

IIRC, you need a 5/16" socket driver and you can buy the screws by the
pound from many places. They're a bit more expensive than deck screws,
but, they don't need to be anywhere near as long. You just want 'em
galvanized.

I think they're called "self-tapping screws" if you buy them as blister
packs.

Or, they may be called sheet metal roofing screws (you don't need the washer type)

Use those instead of flat heads.

They're _great_ for siding.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.