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How big of a hole can I drill through a double top plate for plumbing?

How big of a hole can I drill through a double top plate for plumbing?

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  #1  
Old 01-21-14, 08:37 PM
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How big of a hole can I drill through a double top plate for plumbing?

I have a little bit of a plumbing problem. I am trying to run a vent for a washing machine up and through a double top plate (i.e., two 2x4 horizontal studs). I am pretty sure that the double top plate I am trying to drill through is load-bearing. The vent pipe is 2" which means that the hole is going to be really big.

I'm not sure what to do. Does anyone know what the maximum hole size I can drill in this double top plate?
 
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Old 01-22-14, 04:26 AM
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You can drill the 2 1/8" hole through both top plates, as long as you install two no-nail plates or a 3" mending plate across where the hole is. This will keep you from driving screws into the pipe later on. This is assuming you have standard 16" oc studs.
 
 

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