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Old 04-08-2012, 03:04 PM   #1
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max hole size on 2x4 top and bottom plate


I need to run some DWV vent through 2x4 walls that are non-load bearing walls.. what is the max hole size for this situation? just trying to figure out if i can retro fit 1 1/2 or 2" PVC vertically through that space...thanks!

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Old 04-08-2012, 03:42 PM   #2
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max hole size on 2x4 top and bottom plate


Quote:
Originally Posted by BlueBSH View Post
I need to run some DWV vent through 2x4 walls that are non-load bearing walls.. what is the max hole size for this situation? just trying to figure out if i can retro fit 1 1/2 or 2" PVC vertically through that space...thanks!
Quote:
Originally Posted by IPC
F101.3 Bored holes. A hole not greater in diameter than 40
per-cent of the stud width is permitted to be bored in any wood
stud. Bored holes not greater than 60 percent of the width of the
stud is permitted in non-bearing
partitions or in any wall where
each bored stud is doubled, provided not more than two such
successive doubled studs are so bored. In no case shall the edge
of the bored hole be nearer than 0.625 inch (15.9 mm) to the
edge of the stud. Bored holes shall not be located at the same
section of stud as a cut or notch.
3.5 x 60% = 2.1"
3.5 x 40% = 1.4"

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Old 04-08-2012, 03:50 PM   #3
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max hole size on 2x4 top and bottom plate


Looks like your good to go!
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Old 04-08-2012, 05:20 PM   #4
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max hole size on 2x4 top and bottom plate


Just a question. The 60%/40% is that for vertical studs? I beleive the OP is boring the top plate and bottom plate. Could you completely bore the top and bottom plate in a non load bearing wall?
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Old 04-08-2012, 05:40 PM   #5
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max hole size on 2x4 top and bottom plate


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Originally Posted by bcgfdc3 View Post
Just a question. The 60%/40% is that for vertical studs? I beleive the OP is boring the top plate and bottom plate. Could you completely bore the top and bottom plate in a non load bearing wall?
thats actually one of the reasons i was asking.. ive seen examples online where they cut the plates out completely and just put nail guards across.. but wasn't sure if that is allowed now or not
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Old 04-08-2012, 06:09 PM   #6
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max hole size on 2x4 top and bottom plate


The calculation applys be it vertical or horizontal. Metal plates are recommended .

Last edited by sublime2; 04-08-2012 at 06:17 PM.
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Old 04-08-2012, 07:01 PM   #7
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max hole size on 2x4 top and bottom plate


If it wasn't allowed, how would any bathrooms be vented?
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Old 04-08-2012, 11:19 PM   #8
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max hole size on 2x4 top and bottom plate


This should help.

Taken from the 2009 IRC.

Andy.
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Old 04-09-2012, 01:14 PM   #9
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max hole size on 2x4 top and bottom plate


Assuming the framing is done correctly, it is not uncommon to see a section of top or bottom plate completely cut out even in a load bearing wall. Happens all the time.
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Old 04-09-2012, 02:42 PM   #10
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max hole size on 2x4 top and bottom plate


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Originally Posted by AndyGump View Post
This should help.

Taken from the 2009 IRC.

Andy.

so... this is allowed if im reading the picture right as long as its strapped and fireblocked

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