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I know that you can only bore a non bearing stud 60%. But what about the sole plate and top plate. If I double the studs, do they also count 60 % of double the wood.I know inspector do not like “Homeowner Permits” or shoul;d I say, like to aggrevate the “HP”. also is a 2×6 calculated as a six inch wall or a 5 1/2 inch wall.
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Remember you are talking about the perscriptive code not the actual code.
The perscriptive code presumes that if you cut out less than 60% the sud is sufficiently strong, if you cut out more than 60% of the stud it is not sufficiently strong. This makes disputes easy to settle.
You can cut 90% of the stud out if you add sufficient material to compensate. Then a dispute becomes one of the inspector's opinion v. your engineer's opinion. These are difficult cases.
The bottom plate can be cut thru. The subfloor it sits on provides all the necessary requirements. The doubled top plate needs to be reinforced.
Of course nail guards may have to be installed.