On 2005-07-29, Dave wrote:

I'm assuming worst-case scenario where the pipe will have to pass
right through the middle of a piece of siding, and not close to a
siding edge where I can just cut a notch in the siding.

Hello,

My suggestion, based on absolutely no experience whatsoever, is this:
It seems simplest to arrange that you have a seam where the pipe is,
so you can notch the horizontal siding. For example, instead of
starting the row at one end as usual, start that row at the pipe and
work outward towards both ends.

Cheers, Wayne