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drilling through studs to install a drain line- header needed?

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My plumber is adding a drain line for a kitchen and bath in my new carriage house and the plumber has drilled through numerous studs (about 5) on the exterior wall to run the drain line (from the kitchen to connect with the bathroom) through the wall. That drain line looks like nearly 3 inches round, going through 2x4 studs. Common sense tells me that when you cut a hole that large through such a small space (basically leaving approx. 1/2 inch for the actual support) they should be build a supporting header above the area to become the new support system for the studs/exterior wall. He has also cut into 2 studs in the washer/dryer closet for that drain line too.

questions:

1.) is it ok to run the kitchen drain line into the bathroom one (shouldn't it be the other way around?!)

2.) is there a hole size going through a 2x4 stud (and/or a number of cut studs) that dictates the need for a supportive header to be built?

3.) if no header is built will this create problems down the line? like shifting in my walls/ cracked drywall, etc?

I feel like my plumber is blowing smoke up my ass when I ask these questions and I've been around construction enough to have a strong feeling that his methods are lazy and incorrect- help!

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