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How to Fix a Toilet - Wooden Sub-Flooring Flange Repair - Part 3 of 3

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Uploaded by on Jun 1, 2009

To Purchase the Guide of this video for 99 cents = http://www.homeownerseries.com/xcart/Toilet-Flange-and-Wooden-Sub-Flooring-Gu...

http://www.homeownerseries.com

This is video #3 of a 3-part series. The videos are:

Part 1 = http://www.youtube.com/watch?v=UTNXFkx9oMs
Part 2 = http://www.youtube.com/watch?v=p9uXq2CC5gk
Part 3 = http://www.youtube.com/watch?v=SF471r8BfXw
Flange Part Overview = http://www.youtube.com/watch?v=c8BPxTTsSKc

To watch the Flange Wood Sub-Floor Playlist = http://www.youtube.com/view_play_list?p=E6376D730A087F52

On an inside fitting flange, take an electric drill with a large drill bit and drill holes around the ABS coupling of the flange. Then use the mini hacksaw and cut around the coupling. Unscrew the deck screws holding the flange to the sub-flooring. The metal ring can now be removed. Next, take the mini hacksaw and cut the ABS coupling to the sewer inlet. Several cuts may need to be made. Now, wedge the flathead screwdriver between the ABS coupling and sewer inlet, twisting to break the glue's seal. Again, with some work, the coupling should be able to be removed.

Now that both flange removal scenarios are covered, the next task is to replace the damaged wooden sub-flooring. Mark with a carpenter's square, or straight edge, the area of the floor that needs to be cut out. Make the area large enough so a floor joist on each side of the flange is used for support. Cut out the bad sub-flooring using a power saw set to the sub-flooring's thickness, usually at 3/4's of an inch. Be careful not to cut the floor joists below. When the sub-flooring is removed, supporting struts will need to be installed to give the replacement floor more stability. They must be cut to fit and be mounted between the floor joists, and high enough to support the replacement floor.

With the new support struts in place, screw them in with deck screws and make sure they are secure. Cut and install a new piece of sub-flooring that fits into the desired space with a hole ready, and positioned, for the sewer inlet. Screw down the new piece of replacement sub-flooring, securing it to the struts and structural beams that were just installed. Use enough deck screws so that the floor does not move or squeak.

Now that the sub-flooring has been replaced, glue the new flange to the sewer inlet with ABS glue. When the flange has been placed properly, with the mounting channels even at the 9 and 3 o'clock positions, screw down the flange mounting it tightly to the sub-flooring. Replace any hard flooring to the edge of the sewer inlet, or carpet to the base of the toilet.

Once the flooring is put back, insert the toilet mounting bolts into the channels of the flange, securing them upright with their plastic washers. Finally, place the wax ring over the flange and the toilet is ready to be installed.

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Top Comments

  • carpet underneath a toilet ...... really, thats so gross . But great instructions .

  • yea carpet in a bathroom is disgusting..

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All Comments (14)

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  • Thank you so much for posting this as I need to replace the sub floor of my toilet. Also informing us to measure the waste pipe to buy the right size floor flange.

  • They have come out with a floor flange that fits into 3 inch pipe.It is handy and would work fine on this application if you do not want to get into picking the abs joint that can be a little project if you are not careful. I have picked several abs joints and when doing so just make 2 saw cuts in the pipe about 3/8ths of an inch wide being careful not to cut to deep into the fitting.Then take a hammer and common screwdriver and brake away the 3/8th strip and continue with the pipe.Good luck

  • Wow, I get it!

  • be a man not a kid hit the can not the lid

  • Hugely helpful...I used a Dremmel tool with a 1.5" cutting blade instead of drilling. to remove the flange. If you don't have Dremmel. Go buy one NOW before you start. It only took 7 minutes or so to complete.

  • Excellent detail on all 3 videos. Thank you!

  • 10$ Knees pads are worth every penny for doing this work.

    Great set of videos!

  • Real men don't miss. Damn, that water's cold!

  • Great instructions. My bathroom project is almost exactly what you're doing here, so it's great to see how to fix it. It started with a loose toilet, which turned into a cracked ceramic tile underlayment, which turned into a rotted sub floor, and now I'm deep into the most involved home repair I've ever undertaken.

    I watched all 3 sections of this and learned a lot. Thanks for the great video. I've never been so excited to see the hole under a toilet.

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