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Old 03-10-2008, 07:58 PM   #1
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cutting Durock


What is the best and easiest way to cut Durock? Is it like drywall where you score and snap, or is there more to it than that? Thanks.

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Old 03-10-2008, 08:09 PM   #2
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cutting Durock


I use a 4" grinder with a dry diamond blade. Makes a mess but it's very quick. And, as with Atlantic's post, the dust is some nasty stuff, so I always try to cut it outside and wear a mask. I too have one of those carbide knives, but I find it too slow to use. But, if you only have a few sheets to cut it may be better to use.

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Last edited by jerryh3; 03-11-2008 at 04:14 AM. Reason: Additional info.
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Old 03-10-2008, 08:28 PM   #3
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cutting Durock


We use a razor knife, score and snap. We also use a 4" grinder with a masonry wheel when we need smooth cuts, but like the last jerry3 said, it gets dusty
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Old 03-10-2008, 10:30 PM   #4
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cutting Durock


Use a cement board cutting knife. It has a some-what "T" shape to it. The "T" ends are carbide tipped and look like a circular saw carbide tip.
Example: http://www.askthebuilder.com/Cutting...rd_Video.shtml

You want to keep the dust down, as much as possible, when cutting, due to the silica dust.

MSDS Sheet (Material Safety Data Sheet):
http://www.usg.com/navigate.do?resou...ment_Board.htm:
CARCINOGENICITY CLASSIFICATION OF INGREDIENT(S)
"All substances listed are associated with the nature of the raw materials used in the manufacture of this product and are not independent components of the product formulation. All substances, if present, are at levels well below regulatory limits. Portland cement is not listed as a carcinogen by NTP, OSHA, or IARC. It may, however, contain trace amounts of substances listed as carcinogens by these organizations: crystalline silica, hexavalent chromium, lead compounds, mercury compounds, nickel compounds, and possibly other chemicals. See Section 11 : Toxicology Information for detailed information"

Silica (Health Effects): http://en.wikipedia.org/wiki/Silica

More installation instructions: http://www.askthebuilder.com/Cutting...rd_Video.shtml
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Old 03-11-2008, 02:54 PM   #5
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cutting Durock


never event thought using a tile scribe as we've always got 4" grinders on the job,,, THANKS, bud ! ! !
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Old 03-11-2008, 04:39 PM   #6
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cutting Durock


Personally, If I have to install it.
I use:

Strong Fan ventilation to the outside.
Very good cannister-type dust masks &safety glasses.
A carbide tip skill saw blade, that gets tossed after the job.
A carbide-dusted jig saw blade, for detailed cuts.
Some saw horses.
A chalk pen for marking.
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Old 03-11-2008, 05:52 PM   #7
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cutting Durock


for dec conc engraving, etc, they're often equipp'd w/dust muzzles hook'd up to wet/dry vacs,,, no dust.

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