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Old 10-20-2012, 10:28 AM   #1
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Cutting hole through joist


I am looking to add a 3rd zone to my HVAC system and heat my former attached garage which is now a living room. The easiest thing to do would be to cut a 2 1/4" x 12" hole through the end joist of my house from the basement which would allow me to install the vent. I would need to cut a second hole the same size for the return vent. The joist size is a 2x12. Does this sound like a bad idea or is it acceptable?


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Old 10-20-2012, 10:48 AM   #2
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Cutting hole through joist


shaunz,

here is a link to the code section in regards to notching of floor joists http://publicecodes.cyberregs.com/ic...9_5_par030.htm

and these are the diagrams from the code. I believe you're going to find that is over notching and could weaken your floor.

hope this helps
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Old 10-20-2012, 10:50 AM   #3
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Cutting hole through joist


most of the time if cutting is needed on a structure it will need fortifying in some way or another to accommodate the cutting.
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Old 10-20-2012, 10:51 AM   #4
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Cutting hole through joist


see reply from your post here (Threads merged)
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Old 10-20-2012, 10:54 AM   #5
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Cutting hole through joist


Thanks. And to add a little more detail. The joist I want to cut the two holes in is the one that sits on top of the sill plate on top of the concrete foundation wall.
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Old 10-20-2012, 10:59 AM   #6
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Cutting hole through joist


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Thanks. And to add a little more detail. The joist I want to cut the two holes in is the one that sits on top of the sill plate on top of the concrete foundation wall.

for all of my additions a hole is cut through the foundation and the ducting goes through the foundation wall... a big enough cut for both the return and main. The rim board may need to be doubled above the foundation hole
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Old 10-20-2012, 11:33 AM   #7
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Cutting hole through joist


If he's talking about cutting through a rim joist bearing on the foundation there should be no problem.
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Old 10-20-2012, 11:52 AM   #8
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Cutting hole through joist


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If he's talking about cutting through a rim joist bearing on the foundation there should be no problem.
+1 I agree
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Old 10-20-2012, 01:16 PM   #9
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Cutting hole through joist


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+1 I agree
And I agree with his agreement.
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Old 10-20-2012, 01:59 PM   #10
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Cutting hole through joist


Do you consider the 2x12 that goes all the way around the perimeter on top of the foundation wall to be a rim joist?
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Old 10-20-2012, 02:09 PM   #11
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Cutting hole through joist


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Do you consider the 2x12 that goes all the way around the perimeter on top of the foundation wall to be a rim joist?
Yes…some call it a rim joist others call it a band joist, it’s all the same.

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