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Old 04-11-2011, 09:45 PM   #1
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1/4 vs 1/2" hardiebacker


i am curious if it is alright to use 1/4" hardiebacker on top of 3/4" subfloor if tile goes on top.

if so is the case, i am curious why anyone would ever need 1/2" because you will use 3/4" subfloor anyway (or is this assumption wrong?).

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Old 04-11-2011, 11:35 PM   #2
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1/4 vs 1/2" hardiebacker


The 1/2" material is used in a wall application without the support the flooring gives the material.
The substrate needs to be adequate for tile. Applying hardiebacker to an inadequate subfloor doesn't make it suitable for tile.
Ron

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Old 04-11-2011, 11:48 PM   #3
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1/4 vs 1/2" hardiebacker


yeah but 3/4" OSB subfloor should be adequate, no?
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Old 04-11-2011, 11:58 PM   #4
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1/4 vs 1/2" hardiebacker


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Originally Posted by amakarevic View Post
yeah but 3/4" OSB subfloor should be adequate, no?
I wouldn't tile over just 3/4" OSB. If the joists were the correct size and the span was within parameters, I would add another 5/8" ply over the OSB. Glued and screwed.
What are the size of the joists, their spacing, and the distance they span?
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Old 04-12-2011, 12:51 AM   #5
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1/4 vs 1/2" hardiebacker


it's an old house so the joists are 2x10 but the original size (meaning really 2"). this is for a boiler/water heater alcove. the joists are about 14-15" apart.
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Old 04-12-2011, 08:28 AM   #6
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1/4 vs 1/2" hardiebacker


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it's an old house so the joists are 2x10 but the original size (meaning really 2"). this is for a boiler/water heater alcove. the joists are about 14-15" apart.
Old house means 1x6 or so subfloor? How do you have OSB?
What is your definition of an old house?
In either case, I wouldn't put tile on a single layer of OSB with hardibacker.
Check out the John Bridges Forum for substrate recommendations.
Ron
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Old 04-12-2011, 04:53 PM   #7
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1/4 vs 1/2" hardiebacker


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Old house means 1x6 or so subfloor? How do you have OSB?
What is your definition of an old house?
it is 102 yrs old and yes, the previous subfloor that i ripped out were 1x3 pine. i had to rip i out to make it cleaner for plumbing works.

trust me, there is no sagging
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Old 04-12-2011, 05:07 PM   #8
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1/4 vs 1/2" hardiebacker


It all depends on the type of the tile you are putting down.
You need to calculate subfloor deflection limit.

http://www.apawood.org/pablog/index....Desk-Question-
Deflection-of-Subfloor-Sheathing-for-Ceramic-Tile-Floor-Assemblies

http://www.awc.org/calculators/span/...rcalcstyle.asp

http://www.johnbridge.com/vbulletin/deflecto.pl

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