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How to seal between sill plate and foundation wall with wide gap?

Here is a picture of the top of my uninsulated basement wall. The foundation is poured and from early 1970s. For orientation to the photo: the white in the lower left corner is the vertical face of ...
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0answers
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Can I cut out the sill plate to pass a duct through a load bearing wall?

I need to pass an HVAC duct through a load bearing wall into the basement below it. I can't seem to find a code reference in IRC for what I am allowed to do with respect to notching or cutting away ...
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Ideal Sill Plate width for new construction on 8" block

I've got an addition with a new 8" cinder block wall. I'm curious if it's better to have a 2x8 or 2x6 sill plate? It will be waterproofed on the outside and covered with 2" foam so there shouldn't ...