Drilling Holes Into Floor Joists For Plumbing ? - Remodeling - Contractor Talk

Drilling Holes Into Floor Joists For Plumbing ?

 
Thread Tools Search this Thread Display Modes
Old 04-30-2019, 12:23 AM   #1
Registered User
 
Kmbarnin's Avatar
 
Trade: Remodeling
Join Date: Apr 2019
Posts: 1

Drilling Holes Into Floor Joists For Plumbing ?


I’m putting in a half bathroom and I’m having a problem with toilet draining. To get the right flow there’s no way around it we have to drill through the floor joists for the toilet drain pipe. The pipes are 3 inch pvc. We have to drill through 6 or 7 of the joists. The floor joists are a weird 3 inch thick by 6 inches wide. They are roughly 20-22 inches apart and they run 8 ft long to the center giant IBeam that looks like it was meant for a bridge. How can I reinforce these beams or add support so that I can put in the 3 inch holes? There has to be a way but 6 inch wide joists (5.75 inches) does not seem wide enough to accommodate a 3 inch hole. I mean they are 3 inches thick (2.75 actual)

I can attach pictures later if needed.
Kmbarnin is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 04-30-2019, 07:59 AM   #2
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 23,367
Rewards Points: 2,900

Re: Drilling Holes Into Floor Joists For Plumbing ?


Hire an engineer.

Advertisement

hdavis is online now  
The Following User Says Thank You to hdavis For This Useful Post:
greg24k (06-28-2019)
Old 04-30-2019, 08:05 AM   #3
edward trowelhands
 
Golden view's Avatar
 
Trade: Diplomat
Join Date: Feb 2012
Location: PDX
Posts: 4,509
Rewards Points: 6,250

Re: Drilling Holes Into Floor Joists For Plumbing ?


With slope you'll have less than 1" of meat on the joists. You'll have to run under and soffit it in. Very likely no way around it.
__________________
You make something idiot proof and the world invents a better idiot.
Golden view is offline  
The Following User Says Thank You to Golden view For This Useful Post:
Drywallchic (06-27-2019)
Sponsored Links
Advertisement
 
Old 04-30-2019, 08:13 AM   #4
Not a people person
 
Chris Doom's Avatar
 
Trade: Remodel/landscaping/irrigation
Join Date: Mar 2019
Location: Undisclosed location
Posts: 117
Rewards Points: 279

Re: Drilling Holes Into Floor Joists For Plumbing ?


I know where I am there's no way I'm getting a permit to cut that much out of floor joists. With that being said, We did a job where we went through ten inch joists with three inch pipes and we had 1/4 inch steel plates fabbed up with all the holes predrilled for the pipe and bolts that we impacted on either side of the joists. IDK dude, that way too much wood out of a joist. Iirc my local code is no more than a 20 % or something like that.
Chris Doom is offline  
Old 04-30-2019, 08:14 AM   #5
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 23,367
Rewards Points: 2,900

Re: Drilling Holes Into Floor Joists For Plumbing ?


Quote:
Originally Posted by Golden view View Post
With slope you'll have less than 1" of meat on the joists. You'll have to run under and soffit it in. Very likely no way around it.
Engineered steel reinforcers if you have a lot of cash lying around to burn.
hdavis is online now  
Old 04-30-2019, 08:30 AM   #6
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 23,367
Rewards Points: 2,900

Re: Drilling Holes Into Floor Joists For Plumbing ?


It's a basic code question. Holes have to be a minimum of 2" from the top or bottom of the joist, and no more than 1/3 the depth.

Run it above the joists, below the joists, or get an engineered solution for running it through the joists.
hdavis is online now  
Old 04-30-2019, 08:34 AM   #7
Goin' Down in Flames....
 
Seven-Delta-FortyOne's Avatar
 
Trade: Highwayman
Join Date: Mar 2011
Location: Somewhere Between Heaven And Hell
Posts: 3,857
Rewards Points: 2,186

Re: Drilling Holes Into Floor Joists For Plumbing ?


There's all kinds of options. You just need to find one.

Welcome to the world of remodeling.

You can run the pipe between the joists, and down a wall. (Usually the best way)

You can hire an engineer and then a fab shop to make some fancy pieces of steel, if you want to go the expensive route.

You can box it in, as was suggested.

You can drop the entire ceiling.

You can elevate the WC and install a tank and sewage ejector, and run it up through the attic.

You can relocate the bathroom.

Lots of options. But drilling those joists ain't one.
__________________
Get Off My Lawn.

"There are no big projects. There are only small machines". - R. G. LeTourneau
Seven-Delta-FortyOne is online now  
The Following 6 Users Say Thank You to Seven-Delta-FortyOne For This Useful Post:
A&E Exteriors (06-27-2019), greg24k (06-28-2019), hdavis (04-30-2019), ScipioAfricanus (04-30-2019), tang (04-30-2019), TheConstruct (06-27-2019)
Old 04-30-2019, 10:22 AM   #8
Contractor of the Month
 
Inner10's Avatar
 
Trade: Control Systems
Join Date: Mar 2009
Location: Ottawa, ON
Posts: 25,680
Rewards Points: 4,082

Re: Drilling Holes Into Floor Joists For Plumbing ?


You could use one of those janky Saniflo toilets.

Sent from my Pixel 2 using Tapatalk
__________________
The Following User Says Thank You to Inner10 For This Useful Post: Leo G
Inner10 is offline  
Old 04-30-2019, 07:39 PM   #9
edward trowelhands
 
Golden view's Avatar
 
Trade: Diplomat
Join Date: Feb 2012
Location: PDX
Posts: 4,509
Rewards Points: 6,250

Re: Drilling Holes Into Floor Joists For Plumbing ?


Or a rear outlet toilet.
__________________
You make something idiot proof and the world invents a better idiot.
Golden view is offline  
The Following User Says Thank You to Golden view For This Useful Post:
TheConstruct (06-27-2019)
Old 06-27-2019, 06:04 PM   #10
Member
 
Drywallchic's Avatar
 
Trade: Home improvements
Join Date: Jul 2017
Location: louisiana
Posts: 35
Rewards Points: 104

Re: Drilling Holes Into Floor Joists For Plumbing ?


Above attached garage bathroom. what would you do? If Golden View could chime in i would like to hear your thoughts. well tried to insert photo but i guess url not working because its not showing

Last edited by Drywallchic; 06-27-2019 at 06:07 PM.
Drywallchic is offline  
Old 06-27-2019, 06:06 PM   #11
Member
 
Drywallchic's Avatar
 
Trade: Home improvements
Join Date: Jul 2017
Location: louisiana
Posts: 35
Rewards Points: 104

Re: Drilling Holes Into Floor Joists For Plumbing ?







trying to upload jpegDrilling holes into floor joists for plumbing ?-img_20190624_161922.jpg

Last edited by Drywallchic; 06-27-2019 at 06:14 PM. Reason: trying to upload pic
Drywallchic is offline  
Old 06-27-2019, 06:16 PM   #12
Member
 
Drywallchic's Avatar
 
Trade: Home improvements
Join Date: Jul 2017
Location: louisiana
Posts: 35
Rewards Points: 104

Re: Drilling Holes Into Floor Joists For Plumbing ?


Maybe i should start another thread. i happen to see this one on the same subject so thought i would tag along. would appreciate input. This is how i found it and before putting up drywall it obviously needs addressing. was going to do a plumber type box but will not work as i see it but i can move shower drain an inch and with offset should clear but then there is the toilet drain that was also hacked out so within a 1/4 inch in spots. shocking

.

Last edited by Drywallchic; 06-27-2019 at 06:24 PM.
Drywallchic is offline  
Old 06-27-2019, 07:42 PM   #13
Eater of sins.
 
ScipioAfricanus's Avatar
 
Trade: Designer/Drafter/General Contractor(again)
Join Date: Sep 2008
Location: Orange County, CA.
Posts: 3,989
Rewards Points: 1,780

Re: Drilling Holes Into Floor Joists For Plumbing ?


F'n plumbers.


Andy.
ScipioAfricanus is online now  
The Following 4 Users Say Thank You to ScipioAfricanus For This Useful Post:
Calidecks (06-27-2019), Drywallchic (06-28-2019), greg24k (06-28-2019), TheConstruct (06-27-2019)
Old 06-27-2019, 08:20 PM   #14
Pro
 
TheConstruct's Avatar
 
Trade: Carpentry
Join Date: Dec 2017
Location: Kamloops BC
Posts: 519
Rewards Points: 1,008

Re: Drilling Holes Into Floor Joists For Plumbing ?


I think the answer to both is get a plumber in to have a look. The joists in the picture should be sistered with new ones to solid bearing on both ends ideally.
TheConstruct is online now  
The Following User Says Thank You to TheConstruct For This Useful Post:
Drywallchic (06-28-2019)
Old 06-27-2019, 08:32 PM   #15
Goin' Down in Flames....
 
Seven-Delta-FortyOne's Avatar
 
Trade: Highwayman
Join Date: Mar 2011
Location: Somewhere Between Heaven And Hell
Posts: 3,857
Rewards Points: 2,186

Re: Drilling Holes Into Floor Joists For Plumbing ?


Framer should have boxed it.
__________________
Get Off My Lawn.

"There are no big projects. There are only small machines". - R. G. LeTourneau
Seven-Delta-FortyOne is online now  
The Following User Says Thank You to Seven-Delta-FortyOne For This Useful Post:
Drywallchic (06-28-2019)
Old 06-27-2019, 08:53 PM   #16
Pro
 
rselectric1's Avatar
 
Trade: Licensed Electrical Contractor and Remodeler
Join Date: Sep 2009
Location: Chicago Suburbs
Posts: 11,780
Rewards Points: 870

Re: Drilling Holes Into Floor Joists For Plumbing ?


Thanks for posting on ContractorTalk.com. The Moderators of this forum would prefer that you post Do It Yourself related topics on our sister site www.DIYChatroom.com

ContractorTalk.com is designed for professional contractors to discuss issues and topics related to the construction and remodeling industries. Many of our professional contractors are also members at DIYChatroom.com and are looking forward to assist you with your needs.

Please take a moment to post your question at www.DIYChatroom.com If you're not already a member of DIYChatroom.com you can sign up for a free account by going to http://www.DIYChatroom.com/register.php/

We apologize for any inconvenience that this may have caused. This thread has been closed.

Advertisement

__________________
220...221...whatever it takes!
rselectric1 is offline  
The Following User Says Thank You to rselectric1 For This Useful Post:
greg24k (06-28-2019)


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Weep holes in a picture window. RiverBG Windows, Siding and Doors 7 01-23-2015 11:41 AM
Pre-finished stair tread nail holes heavy_d Flooring 16 12-02-2014 07:10 AM
Drilling holes in porcelain tile ralphandson Tiling 21 12-25-2012 05:43 PM
HOLES in the Roof dougger222 Roofing 13 10-20-2012 12:05 PM
Drilling question redwood Decks & Fencing 40 09-04-2012 06:46 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?