According to Richard J Kinch :
writes:

Should these measures be sufficient in order to prevent damage from ice
dams in the future, or are there other things that I should be doing as
well?

Ice dams are like floods. Eventually a year will come along when the snow
is so thick, you will have them; better construction just raises that
thickness.

On the contrary. Ice dams have _nothing_ to do with snow thickness, and
indeed, most ice dams occur with less snow rather than more.

If the eaves/attic is cold like it's supposed to be, you don't get ice dams.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.