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Old 03-03-2019, 04:37 PM   #1
JamesOlson
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I am going to start tiling a laundry room with sub OSB floor
in a new addition recommendations for sub floor
over OSB durrock/1/2" plywood subfloor or schluter system
any suggestions would be appreciated James
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Old 03-03-2019, 05:35 PM   #2
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Have you checked your deflection?
Is it tounge and groove?
How thick?
True osb or something like advantec?
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Old 03-03-2019, 07:20 PM   #3
JamesOlson
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The sub floor is 3/4 OSB tongue and groove
i cannot detect any deflection or the best way to check
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Old 03-03-2019, 08:33 PM   #4
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Do you have access to the joists underneath?
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Old 03-04-2019, 06:25 PM   #5
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If you look above in the blue boxes there is a deflecto calculator that allows you to enter your info and calculate deflection.
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Old 03-06-2019, 08:30 PM   #6
JamesOlson
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Yes I have access to underneath
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Old 03-10-2019, 11:50 AM   #7
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From prior post I calculated deflection with Deflecto to L 1073
my 9" joists are the engineered type the OSB sub floor is 3/4" lower than
the hallway leading into the planned laundry room should I install 1/2"
durrock on top of the OSB before tiling? Any suggestions would be greatly appreciated
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Old 03-10-2019, 12:03 PM   #8
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Welcome, James.

Please don't start new threads with the same questions. If you don't feel you're getting adequate response, make another post to your thread and bump it to the top of the queue for attention.

Our Deflectolator is not, as the "NOTE" above the entry boxes indicates, useful for engineered joists, but only for dimension lumber. For your engineered joists you'll need to consult the manufacturer for the design deflection. The manufacturer's name will usually be displayed on the members along with a model identification and the deflection data is usually available online. Such joist structures usually exceed building code, but that's not a guarantee.

Without the joist spacing we can't help you evaluate the subflooring (a separate deflection issue), but regardless whether you require a second layer of subflooring, you still must install some sort of tiling substrate such as a CBU or a tiling membrane of some sort before tiling.

My opinion; worth price charged.
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Old 04-15-2019, 08:17 PM   #9
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suggestions for sub floor 3/4 OSB engineered beam rating L480
need 1.250" subfloor for tile possible noble seal over OSB and 1/2"
Durrock any suggestions would be greatly appreciated
Thanks James
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Old 04-18-2019, 02:38 PM   #10
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tiling laundry room 3/4 OSB subfloor 1"1/4 sub floor needed
any suggestions would 1/4" birch sub floor than 1/2 " durrock
than tile work ?
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Old 04-18-2019, 03:48 PM   #11
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You don't want any plywood of 1/4" thickness in a tile installation. 3/8" is the bare minimum.

What is the spacing on the joists? (How far apart are they?)
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Old 04-18-2019, 07:08 PM   #12
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Unless desired for the thickness, all you need on a floor is 1/4” stuff. More does not buy you more strength. The tile industry says 5/8” subflooring is adequate for tile with spacing of 16”. More, especially if things aren’t pristine is useful.
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Old 04-19-2019, 05:58 AM   #13
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the spacing is 16" on center withe engineered beams with load rating of L480
sub floor is 3/4 OSB is it necessary to cover the OSB before installing
1/2" durrock than tile thanks James
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Old 04-19-2019, 10:31 AM   #14
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If it's in good shape and attached well to the joists, you can get by with 3/4" OSB.

Unless you're just wanting the extra 1/2" of height, I would use 1/4" cement board over the OSB. Using 1/2" will just make the floor higher, but will not add any strength to it.
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