Maximum hole size in stud

[Brian2147]

What’s the maximum size Bore a hole in a stud, load and non bearing wall. The maximum hole size in a top plate, what about a window header. I’ve browsed around and gotten a few numbers. Would like to hear what is said hear before I move forward.

Kitchen remodel, sink is basically staying in the same spot, new cabinets, floor, window etc.. The new window Is about 55 inch’s in length, what’s there now is two windows with the vent going between them through the header and out the roof. Gonna have to move the vent about 2-3 feet to the left and bore through the header and top plates and drill through a few studs for the drain. Any advice would be greatly appreciated.

I’ll try to post more pics

 

[Jadziedzic]

An online search for "notching and boring guide" will turn up a copy of the Western Wood Products Association's guide, the contents of which may be subject to interpretation by your local AHJ - but a good resource nevertheless. The Family Handyman magazine has an article available on their Web site which gives an abbreviated version of the n&b guide.

 

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[Djarchow]

It depends on what building codes you are under. You have to look at both the plumbing code and the building codes for your area as they may not agree. Also your local inspector may have different views.

Here is a good document I found while finishing my basement that tries to pull together all the different codes and the code approved repair/reinforcement methods:

https://www.madison-heights.org/DocumentCenter/View/186/Simpson-Repair-and-Protection-Flyer-PDF