Replacing Linoleum with Tile Floor Height Concern

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Old 07-12-19, 10:15 AM
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Replacing Linoleum with Tile Floor Height Concern

Hello everyone,
I am replacing old linoleum with tile in an upstairs bathroom. I took up the lino and found it was glue directly to the 3/4" OSB subfloor. My concern is once I put down 1/4" backer board on the subfloor and then the tile, the floor will be raised about an 1". This is a huge amount and would result in the adjoining hall carpet being below the tile. Plus the toilet fitting will end up below the tile as well. Is there any thoughts on what I can do? Sorry if this has already been asked in a previous thread. Thanks for your help,

Ramon
 
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Old 07-12-19, 11:43 AM
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If you want tile that is what you have to do and the floor will end up at a higher elevation. Tile should not be installed directly onto wood so you need a proper backing material like Hardie or cement board... which adds thickness in addition to the tile and thinset thickness. There are extenders for the toilet flange but about the only thing you can do for the difference in elevation with the carpet is get a threshold plate to help with the transition though it will still be a toe stubber.
 
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Old 07-12-19, 08:34 PM
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Thank you for your response. I'm hearing mixed responses about using 1/4" or 1/2" backer board. I figured with a 3/4" OSB subfloor, 1/4" backer board would be fine. Agree?
Also, for a bathroom floor would you red guard the backer board or is that not necessary since I'm using hardi board and porcelain tiles?
Thanks,

Ramon
 
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Old 07-13-19, 03:21 AM
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If your floor joists are 16" center to center then 3/4" OSB should be adequate. Cement board and Hardie Backer technically aren't there for structural strength though the thicker is stronger. I don't know if you can stand another 1/4" of floor thickness so I don't know if you really have a choice.

Red Guard is a waterproofing membrane material intended for showers. It is traditionally not used under tile floors.
 
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Old 07-13-19, 03:29 AM
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We always get into discussions regarding CBU thickness, it's acceptable for 1/4" on floors but personally if Im going to all the trouble to tile a floor the last thing I want is any kind of issue with that floor moving, I always install 1/2"!
 
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