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Old 09-05-2013, 04:41 PM   #1
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Cement Board


I am finishing a wall behind a wood stove with rock wool, steel framing and tile so it will be insulated and completely non combustible.



1. What is the best way to the cut cement board?

2. What is the best way to fasten the cement board to the steel studs?

3. What should my nail/screw pattern be for the cement board?

Thanks!

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Old 09-06-2013, 01:42 PM   #2
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Depends on the board. Some can be scored and snapped.
I prefer use a hardi blade in my circ saw. Make
sure you use a mask and cut upwind.

As for screws check the board manufacturers web site
for their recommendation. Drywalls screws won't work.
Cement board screws might, but that will depend on the
thickness of your steel studs. Heavier gauge is better.

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Old 09-06-2013, 04:04 PM   #3
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Durrock and wonder board can be scored and snapped like drywall---or cut with a diamond blade on a grinder or wet cutting circular saw--I slap a wet sponge against the blade and dust becomes mud instead.

Hardie needs a V shaped carbide scorer---and is snapped by bending it upward on the side of the score---diamond cutter as above.

You can cut curves with a jig saw and a carbide blade on either product.
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Old 09-06-2013, 05:23 PM   #4
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They have a hardi board type now that cuts like drywall.Regular durrock is a pain it dont cut smooth with a knife and useing a powersaw the dust is brutal.There is a durrock screw that you shoud use but iam not sure you can get the cutter type to go thru them metal studs so you may have to pre drill..As far as the screw pattern,the board i have seen has dots on it showing you where to put the screws.
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Old 09-06-2013, 05:36 PM   #5
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Could have just used 5/8 fire rock and be a whole lot easier. And no dust to deal with.
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Old 09-06-2013, 06:37 PM   #6
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Quote:
Originally Posted by joecaption View Post
Could have just used 5/8 fire rock and be a whole lot easier. And no dust to deal with.
@joecaption is fire rock fire rated drywall? what is a brand so I can look at a MDS sheet.
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Old 09-06-2013, 06:48 PM   #7
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Here's just one of the many products.
http://www.nationalgypsum.com/produc...ProductID=2346
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Old 09-06-2013, 06:58 PM   #8
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@joecaption - Thanks but isn't cement board a better backer for the tile I plan to put behind the wood stove since it is super rigid?
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Old 09-06-2013, 07:29 PM   #9
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Cement boars is not 'super rigid'----rather floppy actually---but just fine for wall tile----and a good choice for the area behind a stove.
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Old 09-06-2013, 07:45 PM   #10
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@oh'mike - cement board is more rigid and durable than sheetrock though?
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Old 09-06-2013, 07:59 PM   #11
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You never mentioned you where installing tile.
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Old 09-06-2013, 08:10 PM   #12
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Quote:
Originally Posted by joecaption View Post
You never mentioned you where installing tile.
He said rok wool,steel framing and tile.Thats why i said use hardi backing sheets and be done with it.Alot eaiser to cut than durock.
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Old 09-06-2013, 09:15 PM   #13
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Hardie backer is stiffer than drywall---Durrock is not---but either one will do what you want.

A note on wood stoves---they will get the wall really hot if you install the stove closer than the recommended distance.--

If that is your intention---add a heat diverter between the stove and the wall---this could be sheet metal--or masonry---

I heat with a wood stove---

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