I have vertical redwood siding on one side of my house and I've found
that there's a sizeable gap between the bottom edge and the wall that
mice have been using to get into my house.

The gap was large enough (1") that I wonder if it's supposed to be
there for ventilation.

Here's a pic, but you can hardly tell that there's a gap between the
siding and the wall (and, yes, the previous owner painted over
beautiful redwood):
http://i176.photobucket.com/albums/w...-0757_IMG2.jpg

Mike