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Old 11-09-2012, 07:43 AM   #1
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cutting cement board


I'm replacing linoleum in our bathroom with tile, and am planning to install 1/4 cement board underneath. Our bathroom is really small and has small sections/walls that protrude, and I was wondering if anyone has any tips for cutting notches into cement board. Everything I can find on cement board seems to assume that every room is built for perfectly straight cuts!

Thanks!

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Old 11-09-2012, 07:50 AM   #2
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cutting cement board


http://www.contractorsdirect.com/Til...Scoring-Cutter

I make the long cuts with a carbite tipped ciruler saw.

Make sure to wear a dust mask.

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Old 11-09-2012, 07:51 AM   #3
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Unfortunately I don't think that will work in my case, as some of the parts that are protruding are only 4 to 5 inches across and a couple inches deep.
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Old 11-09-2012, 08:01 AM   #4
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http://www.bing.com/images/search?q=...cutting+shears
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Old 11-09-2012, 04:58 PM   #5
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cutting cement board


I have this strange feeling that Cjohn is not interested in buying a CBU shears ($200-300) to do his tiny bath floor. Just a feeling though.

You can make small "U" cuts into concrete board with even just a razor knife and a few other regular tools, but it can take some time. Alternatively you can cut the larger sheet into smaller pieces so you'd be making "L" instead of "U" cuts. A carborundum blade on a sabre saw is available too.

The easiest and cheap way is to use a side grinder like this.http://www.google.com/imgres?q=side+...9,r:0,s:0,i:88

Some are available for under $40 and Harbor Freight should have one for under $20. It's a tool you'l use many time including to score the concrete board & certain tile cuts maybe.

It does produce dust so use it outside with a fan behind you blowing the dust away. A mask is smart.

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Old 11-10-2012, 11:12 AM   #6
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Sawz-all with a metal blade, no dust no fuss

Last edited by Hardwood Head; 11-10-2012 at 11:14 AM.
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Old 11-12-2012, 08:37 AM   #7
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You nailed it Jazman--lot looking to spend that much on a $200 bathroom tile job . Thanks for the tips, it looks like that grinder is probably the best option. Thank you all for your advice!
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Old 11-12-2012, 08:54 AM   #8
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cutting cement board


I used my RotoZip with a cement blade on it. Very easy to use and really precise because it's small and light.
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Old 11-12-2012, 05:39 PM   #9
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Drill about a million holes it and connect the dots with a chisel . Tinme consuming , But the least of buying a bunch of tools , Also a scribe will work , Just scribe it about 20 times till you work a weak spot , Drill the corners tacomahardwoodfloors.com
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Old 11-12-2012, 11:32 PM   #10
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cutting cement board


I just finished a huge siding/trim project with 1/4 hardi plank. we used a simple diamond cement 7.5" circular blade for our miter and table saw. Works just fine.
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Old 11-13-2012, 07:18 AM   #11
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TacomaHardwood--Did you use a special drill bit?
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Old 11-13-2012, 08:17 PM   #12
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Quote:
Originally Posted by Cjohn View Post
TacomaHardwood--Did you use a special drill bit?
Yes, he probably uses one that will last long enough to make a million holes.

You're not actually thinking of doing that are you?

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Old 11-14-2012, 07:10 AM   #13
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I have to cut out a hole for the toilet flange as well, and I was thinking some drill holes would work best for that, unless there's a better option?
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Old 11-14-2012, 08:38 PM   #14
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Quote:
I have to cut out a hole for the toilet flange as well, and I was thinking some drill holes would work best for that, unless there's a better option?
I already gave you the answer in post #5 above. Use a grinder if you have one. Of course drilling a bunch of holes will work too.

In the old days when Wonderboard first came out we didn't use or know of all these many tools available today. We made a hole by first scoring the surface and embedded mesh with a regular utility knife or laminate scriber, and then tap with a hammer to complete the hole. So, I recommend the grinder with a fan blowing or a jig saw with appropriate blade.

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Old 11-14-2012, 08:52 PM   #15
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Instead of Cement Board, the better option is Georgia-Pacific's DensGuard http://gp.com/build/product.aspx?pid=6388 or DensShield http://gp.com/build/densshield-tilebacker-board I used DensShield for our bath floor, and it is easy to work with, and holds up as good as Cement Board.

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