Relocating Toilet - Plumbing - DIY Home Improvement | DIYChatroom

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing


Thread Tools Display Modes
Old 12-13-2009, 09:14 PM   #1
Join Date: Dec 2009
Posts: 1
Rewards Points: 10

relocating toilet

Hi there. I'm in the process of moving and attic bathroom several feet for some better head room, and so I don't hit my head when I use the toilet. Anyways, the one dilemma I'm having is the toilet drain. I have to move the closet flange approximately 8 feet, and the joists are 2x8. Also, I'm dealing with 3" pvc. Would this be able to be done with the correct pitch, and still be able to fit the connection under the subfloor? The drain pipe would have to go through one joist, but for the most part the drain will run parallel with the joist. I am hiring a plumber, but just wanted to get some other thoughts.

Thank you


exdrocca is offline   Reply With Quote
Old 12-13-2009, 10:39 PM   #2
Join Date: Apr 2007
Posts: 558
Rewards Points: 500

You're only supposed to drill the middle one third of a joist, so you shouldn't be drilling a 3 5/8" hole (O.D. of a 3" PVC pipe) through a 2" x 8" joist. The highest up into a joist bay you can get the bottom of a 3" pipe where it picks up a toilet is about 5 7/8" (from the bottom of the subfloor). It can be higher if you're laying durock and tiling the floor of the bathroom, but if it's linoleum, the 5 7/8" measurement will be about right. By the time you run 8 feet at 1/4" per foot, the bottom of the pipe will hang 7 7/8" from the bottom of the subfloor.

The problem with that is the hub of the 3" 90 (where the pipe goes from horizontal to vertical) will have to be drilled through the top plate of the wall; you may even have to notch the plate to get that 90 in (another structural consideration - especially if it's an outside wall).

So given the first consideration (drilling a large hole through a 2x8, you should probably consult an engineer (if there's no builder involved) to see what you could do to remediate the structural integrity.

I had a similar situation a couple of years ago where they ended up fabricating a steel plate with a pre-drilled 4" hole (I told them where to cut the hole). The builder sistered it to the joist, and then I was able to drill the joist and complete the piping.


Last edited by Ishmael; 12-13-2009 at 10:47 PM.
Ishmael is offline   Reply With Quote

Thread Tools
Display Modes

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
Toilet issue: Shims, wax, general disarray. dawho1 Plumbing 8 01-23-2010 07:38 PM
Help me check my logic on clogged drain and overflowing toilet Southlake_Ed Plumbing 10 01-05-2010 07:52 PM
Leaky toilet drain secutanudu Plumbing 0 08-17-2009 10:14 AM
relocating toilet lindapalmbay Plumbing 9 04-10-2009 10:11 AM
Where is the toilet vent?!?!? domgbrown Plumbing 4 01-11-2008 06:33 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1