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Why are 1/2" corcrete backer boards less than 1/2"?

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Why are 1/2" corcrete backer boards less than 1/2"? Jack 01-31-2007
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Posted by Jack on January 31, 2007, 2:53 pm


I'm about to put some granite tiles down on my bathroom floor but it never
occurred to me to look at the concrete backer boards more closely. I
purchased 1/2" and it didn't look right so I took my tape and measured it
somewhere between 1/4" and 1/2".

I know with wood, a 2x4 is less because it was planed down at the factory to
the smaller finished dimension. But what's the excuse for concrete backer
boards?



Real Goods Solar, Inc.
Posted by Richard J Kinch on January 31, 2007, 4:14 pm


Jack writes:

> But what's the excuse for concrete backer boards?

I believe plywood comes in off-fraction inch thicknesses, because it is
actually manufactured to even millimeter thicknesses. Perhaps that is the
case with this product, too.


Posted by Jeff Wisnia on January 31, 2007, 5:47 pm


Richard J Kinch wrote:
> Jack writes:
>
>
>>But what's the excuse for concrete backer boards?
>
>
> I believe plywood comes in off-fraction inch thicknesses, because it is
> actually manufactured to even millimeter thicknesses. Perhaps that is the
> case with this product, too.
>


To allow some room for a layer of thin-set tile mortar of course. <G>

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.


Posted by DanG on January 31, 2007, 8:18 pm


I don't know what brand you bought.

Wonderboard by Custom is 1/4 " and 1/2". Usually stocked as 3x5.
Durock by USG comes in 5/16, 1/2, 5/8. Usually stocked as 4x8.

--
~~~~~~~~~~~~~~~~~~~~
DanG
A live Singing Valentine quartet,
a sophisticated and elegant way to say I LOVE YOU!
valentine@okchorale.org (local)
http://www.singingvalentines.com/ (national)


> I'm about to put some granite tiles down on my bathroom floor
> but it never occurred to me to look at the concrete backer
> boards more closely. I purchased 1/2" and it didn't look right
> so I took my tape and measured it somewhere between 1/4" and
> 1/2".
>
> I know with wood, a 2x4 is less because it was planed down at
> the factory to the smaller finished dimension. But what's the
> excuse for concrete backer boards?
>



Posted by Jack on February 1, 2007, 10:13 am




>I don't know what brand you bought.
>

It was 1/2" HardiBacker.




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