On Thu, 20 May 2021 04:34:57 -0700 (PDT), trader_4
wrote:

On Thursday, May 20, 2021 at 12:15:08 AM UTC-4, Jannes wrote:
do you need to cut up 2' of siding to install ice and water shield?

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For what purpose? Around here it's installed on roofs to protect against ice damming.
And per code it has to be installed up the roof plane from the lower edge until
it's 2 feet past the inside heated space below. Maybe that's where your 2 feet is
coming from?

Here they want the membrane to cover the entire roof.
This is what I needed on my addition.
http://gfretwell.com/electrical/addition/dry%20in.jpg

It is so, when the hurricane blows the shingles off, you still have a
roof.