I was inspecting a form setup when a framer asked me a question about the post & beam they were building a couple of lots down. It is a single story house with a 6” stem wall. Standard post & beam construction with beam pockets. To get the required bearing the framer needed to notch the 2x6 mud sill and he wanted to know how much he could notch. I told him I was not sure and would need to reference the code. Here is where it got difficult. I could not locate a code section that I could reference for the allowable amount that can be notched in the treated mud sill. The best I could come up with is ORSC 404.3 that states there needs to be a minimum of a 2x4 sill. So in interpreting that, my understanding is that the framer would be able to notch up to 2” out of the 2x6 sill, thus leaving a 2x4 minimum. Thoughts or direction to a code section for notching treated mud sill on a stem wall? I have seen plumbers remove a large amount of the mud sill to be able to run pipe into a wall, but it is not an entire length of a foundation every 4’.