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Old 04-11-2011, 11:56 PM   #1
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"smooth" side on hardie backer


i am sort of frustrated a little that things like OSB and hardie backer do not come with a clear writing "this side up", instead one has to know... i know it's very rudimentary knowledge but it helps first timers.

so i saw online that THE SMOOTH SIDE goes up ... but what exactly is the smooth side? the side that has the relief with letters and a grid around is smoother when you touch the squares inside the grid but when you go across the whole surface, it feels coarser because you go over the letters. on the other side, that has no letters, the surface is coarser than the squares on the other side but is consistent...

so you can see my frustration. what gives, which side goes up? to avoid the smoothness confusion, i will give two choices:

A. the side with letters/relief
B. the side with nothing on it, i.e. the simple side
this illustration on this page implies A. but i just want to confirm:

http://www.jameshardie.com/homeowner...rterInch.shtml


Last edited by amakarevic; 04-11-2011 at 11:58 PM.
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Old 04-12-2011, 12:52 AM   #2
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"smooth" side on hardie backer


The 1/4" hardie backer will have the grid that may be used in placing tile or screws. The 1/2" will have a series of dots which may be helpful in placing screws. So you want to install them so these indicators are visible.

They go up as they are shown in the pic/link you provided.

Not an expert, but from what I've read, its not a big deal to install the wrong way. It won't cause a project to fail.


Last edited by Blondesense; 04-12-2011 at 12:56 AM.
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Old 04-12-2011, 10:43 AM   #3
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"smooth" side on hardie backer


I don't know anything about Hardibacker, but Durock cement board has a rough side and a smooth side too. From what I have read, you put the smooth side up if you're using mastic, and the rough side up if you're using thinset mortar.
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