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Old 02-11-2008, 08:22 PM   #1
Risch
 
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Maximum hole in floor joist


Hi. I need to re-route a 6" vent run through a 10" joist, and continue the run to an outside vent. I understand it can be done. I need to know what size hole through the joist would be best to maintain joist strength integrity' i.e.: a 6" hole with two 90 degree vent turns, or two 10"x3"x6" register boots? I appreciate any help and suggestions

Risch

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Last edited by Risch; 02-11-2008 at 08:23 PM. Reason: Sp.
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Old 02-11-2008, 09:40 PM   #2
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Maximum hole in floor joist


A 6 inch hole in a 10 joist is too big. Don't do it. I believe the maximum allowed size is near 2-1/2 inch's. A carpenter should be along soon who will give the exact size on a 10 inch joist and other details.
You will have to run the duct under the joists.

I just found this on a search, go to:
http://tileyourworld.com/constructio...oringGuide.pdf
Its everthing you need to know on boring and notching joists.

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Last edited by rjordan392; 02-11-2008 at 10:00 PM.
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Old 02-11-2008, 10:18 PM   #3
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Maximum hole in floor joist


You'll have to come up with another route for that vent.

The previous link does a good job at explaining the "concept" of putting holes in joist, and maximum allowed bore size.
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Last edited by AtlanticWBConst.; 02-11-2008 at 10:28 PM.
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Old 02-12-2008, 03:57 PM   #4
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Maximum hole in floor joist


Quote:
Originally Posted by Risch View Post
Hi. I need to re-route a 6" vent run through a 10" joist, and continue the run to an outside vent. I understand it can be done. I need to know what size hole through the joist would be best to maintain joist strength integrity' i.e.: a 6" hole with two 90 degree vent turns, or two 10"x3"x6" register boots? I appreciate any help and suggestions

Risch
Who told you that you can cut a 6" hole in a 2x10?
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Old 02-12-2008, 04:51 PM   #5
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Maximum hole in floor joist


You can drill holes in joist no closer than 2 1/2 from the outside edge of the joist, but, the hole cannot be any larger than 1/3 the floor joist...3 1/3 inches at least in NC.
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