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Old 04-10-2018, 09:38 AM   #1
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Subfloor Prep for Thinset


Do I need to fully remove, scrape or grind, the old glued paper backing of vinyl sheet goods (vinyl layer removed) before I apply thinset to the plywood subfloor? or does a coat or two of primer work ok. This to go under backerboard for tile.

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Old 04-10-2018, 02:13 PM   #2
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Re: Subfloor Prep for Thinset


Yes and you also remove any 1/4" underlayment on which the vinyl was placed.

Note: Answer was made strictly to question asked, no judgment was made whether the subfloor or joist structure is sufficient for tile since no information about either was provided.
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Old 04-10-2018, 03:45 PM   #3
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Re: Subfloor Prep for Thinset


Alright, I am assuming that the joist system is sufficient, though, how do I check it? And I've figured I should reinforce around the toilet drain.

The vinyl was original to the house, so layed over the original subfloor, no other sub floor or underlayment.
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Old 04-10-2018, 06:48 PM   #4
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Re: Subfloor Prep for Thinset


Subfloor is total 1" (3/4" + 1/4")
Joists are 9" x 1 1/2", 16" on center, 11" span between outside wall and center of house supports. Toilet side wall partition sits directly on joist. Opposite side wall partition is 2" from joist. Wide of bathroom is 3 joists wide. Actual dimension of room is 5' x 4 1/2'
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Old 04-11-2018, 10:47 AM   #5
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Re: Subfloor Prep for Thinset


Your joists sound fine but that 1/4" layer in the subfloor needs to come out. Personally, I would replace it with at least another 1/2" if not 3/4" layer of plywood and the 1/4" cbu.
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Old 04-11-2018, 11:46 AM   #6
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Re: Subfloor Prep for Thinset


I see. creates about a 1/4" height difference with hallway. But that is what transitions are for.
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