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Old 10-07-2009, 08:23 AM   #1
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Need to drill hole through rim joist for venting


Hey gang,

I plan on installing a fresh air make up vent and have it exit to the outdoors from the basement through the rim joist. My rim joist is a 2 x 8. Is it safe to drill for a 5" vent duct? If not what is the maximum size allowed or what modifications could I do to make it safe/ code complaint?

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Old 04-02-2012, 08:05 AM   #2
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Need to drill hole through rim joist for venting


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Last edited by hammerlane; 04-02-2012 at 08:10 AM.
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Old 04-02-2012, 11:20 AM   #3
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Need to drill hole through rim joist for venting


Your local building inspector should have something like .pdf files on their website with that kind of information. A 5" hole would be far too big for a floor joist without some additional bracing, but a rim joist does not have the span load on it, so you may be able to do more. Also you need to be mindful of what is loaded on the beam at that point, as in from above.

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Old 04-02-2012, 11:21 AM   #4
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Need to drill hole through rim joist for venting


I believe the max hole size for 2x8 joist is 2-3/8 inch diameter
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Old 04-02-2012, 11:26 AM   #5
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Need to drill hole through rim joist for venting


found this:
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Old 04-02-2012, 11:31 AM   #6
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Need to drill hole through rim joist for venting


Quote:
Originally Posted by hammerlane View Post
found this:
This is for floor joists that span empty space. A rim joist is sitting on the foundation and so is supported along it's entire length. A rim joist can have a larger hole in it as long as there isn't a major support post anchored just above that location on the rim.

This is one site that gives structure codes, but it is not searchable.
http://publicecodes.citation.com/st/...0v10/index.htm

I think the easiest thing to do is to call the building department and ask.

LMHmedchem

Last edited by LMHmedchem; 04-02-2012 at 11:34 AM.
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Old 04-02-2012, 11:32 AM   #7
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Need to drill hole through rim joist for venting


Quote:
Originally Posted by LMHmedchem View Post
This is for floor joists that span empty space. A rim joist is sitting on the foundation and so is supported along it's entire length. A rim joist can have a larger hole in it as long as there isn't a major support post anchored just above that location on the rim.

This is one site that gives structure codes, but it is not searchable.
http://publicecodes.citation.com/st/...0v10/index.htm

LMHmedchem

I agree. Just posting the above for spanning joists
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Old 04-02-2012, 11:35 AM   #8
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Need to drill hole through rim joist for venting


Quote:
Originally Posted by hammerlane View Post
I agree. Just posting the above for spanning joists
It would be nice if the building codes were searchable, but I guess that would be a bit too much to ask.

I personally don't worry all the much about the rim joist, but I do make sure that I am going through a place without too much load over top. I would avoid areas of the joist whit a bearing wall above. If I have any reservations, I scab on a 3/4" plywood plate, or two, with adhesive and 3" deck screws like you would if you had to reenforce a large notch in a joist where a trap was run through.

Be aware, this is my opinion and practice, and you asked about code. You probably should contact the building department and ask. Just say you are thinking of doing something and want to know if it's allowed. They will probably say that rim joists are exempted and you are fine. There may not be anything specific in the code if it's exempted. I don't remember doing this for anything larger than a 3/4" copper pipe, so keep that in mind. Isn't there a windows you could use?

LMHmedchem

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Last edited by LMHmedchem; 04-02-2012 at 11:46 AM.
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