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Old 02-02-2009, 10:35 PM   #1
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Drilling 2x10 for 3 inch pipe


I am doing a bathroom remodel and need do drill some holes in a couple floor joists for the new route for the toilet pipe. I will be using 3" for the toilet drilling thru 2x10's. I would like to add some re-enforcement around the cut area so do you think a section of 2x10 glued and nailed next to it would be good or should I use 3/4 plywood ripped to 10 inches and then glued and nailed?? Also how long should I extend past the hole on either side?? Thanks Don

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Old 02-03-2009, 06:36 AM   #2
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Drilling 2x10 for 3 inch pipe


Be sure to drill the hole in the middle of the joist and within 24" of the bearing point. Strap with a steel strap that is fastened with teco nails. Strapping with lumber will do little good. Simpson makes a good one about 18" long
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Old 02-03-2009, 08:07 AM   #3
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Drilling 2x10 for 3 inch pipe


Just a question... Can you drill a hole for a 3" pipe (3" OD) in a 2x10 (1"x 9")? Wouldn't this exceed the 1/3 rule? Or will these Simpson straps maintain the strength of the joist? This is for my own info.
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Old 02-03-2009, 08:23 AM   #4
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Drilling 2x10 for 3 inch pipe


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Just a question... Can you drill a hole for a 3" pipe (3" OD) in a 2x10 (1"x 9")? Wouldn't this exceed the 1/3 rule? Or will these Simpson straps maintain the strength of the joist? This is for my own info.
Another solution would be to box the path to the stack pipe. Cut the joists out, structurally box out the space and use joist hangers to reattach the cut members. You also avoid small pieces of pipes and a series of couplings.
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Old 02-03-2009, 08:48 AM   #5
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Drilling 2x10 for 3 inch pipe


How would you drill all the holes in the center if you need to have a slope for the drain? Just curious.
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Old 02-03-2009, 09:17 AM   #6
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Drilling 2x10 for 3 inch pipe


You're probably going to end up running your pipe underneath the joists.

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Old 02-03-2009, 09:21 AM   #7
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Drilling 2x10 for 3 inch pipe


All good posts, but we need to know more.... What distance are you going through the joists? Yes 3 1/2" would be okay. Boxing would work for only a short distance. Anything longer than two joists and you should plan on running below the joists and making a soffit.
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Old 02-03-2009, 09:08 PM   #8
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Drilling 2x10 for 3 inch pipe


The run is going to be 8 feet. Boxing out the run is not a practical option. The floor under bathroom is under our kitchen.
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Old 02-03-2009, 09:10 PM   #9
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Drilling 2x10 for 3 inch pipe


Box out for that long of a run?? Is that allowed per code?? I don't know.
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Another solution would be to box the path to the stack pipe. Cut the joists out, structurally box out the space and use joist hangers to reattach the cut members. You also avoid small pieces of pipes and a series of couplings.
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Old 02-03-2009, 09:18 PM   #10
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Drilling 2x10 for 3 inch pipe


no, you cannot box it. Run it below the joists. you need 1/8" per foot slope. You may have enough to drill it. Use Simpson straps to reinforce each joist. You also need a steel plate when the pipe is closer than 1 1/4" in.
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Old 02-04-2009, 10:57 AM   #11
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Drilling 2x10 for 3 inch pipe


Won't fly by the man in NC. Remember the 1/3 rule. You could get by with one joist, but the slope is the show stopper. If your slope is 1/8 per foot, sounds like a lot to for a drain but I'm not a plumber, then at the end of the 8 foot run you will have to have a 1 inch drop. That will exceed the 1/3 rule. Besides, if your house is already finished, how are you going to put a non-coupled piece of pipe in that length. Sounds like boxing is your only alternitive.
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Old 02-04-2009, 11:34 AM   #12
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Drilling 2x10 for 3 inch pipe


Real word, those holes rarely get drilled exactly where you plan them to go, either - mess up, then you have enlarge one or more holes to maintain slope... you could sister the joists, but the modification needs to be engineered, when I researched this a while back (as the result of a similar situation at a home inspection) I found this discussion informative: http://www.iccsafe.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=10;t=001699 with regard to the problems this sort of joist boring can create for a builder, contractor or homeowner.

Last edited by Michael Thomas; 02-04-2009 at 11:42 AM.
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Old 02-04-2009, 04:31 PM   #13
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Drilling 2x10 for 3 inch pipe


Like that pic.
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Old 02-04-2009, 05:04 PM   #14
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Drilling 2x10 for 3 inch pipe


Quote:
Originally Posted by Michael Thomas View Post
Real word, those holes rarely get drilled exactly where you plan them to go, either - mess up, then you have enlarge one or more holes to maintain slope... you could sister the joists, but the modification needs to be engineered, when I researched this a while back (as the result of a similar situation at a home inspection) I found this discussion informative: http://www.iccsafe.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=10;t=001699 with regard to the problems this sort of joist boring can create for a builder, contractor or homeowner.

Great read....thanks.

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