PDA

View Full Version : Cutting help - Cement board??


Philphoto
05-27-2012, 07:06 PM
I have to cut some cement board --like is used in shower enclosures. I have a circular saw or jig (sabre)saw. I need to know what type of blade to use. I have never cut this stuff before, so am at a loss at to what blade type.

Phil

toollovingschultz
05-27-2012, 07:23 PM
I have to cut some cement board --like is used in shower enclosures. I have a circular saw or jig (sabre)saw. I need to know what type of blade to use. I have never cut this stuff before, so am at a loss at to what blade type.

Phil

phil there are special blades for cutting cement board called fiber cement blades here is a linkhttp://www.amazon.com/Irwin-4935473-Polycrystalline-Diamond-Circular/dp/B003A3O884/ref=sr_1_8?s=power-hand-tools&ie=UTF8&qid=1338153657&sr=1-8
Andy

Gabe O
05-27-2012, 09:53 PM
Hi Phil,
I install this stuff very often and have used the (special) backer board (less dust) blades. Don't waste your money on them. They are expensive and don't last very long. You are better off buying 4 cheap framing blades than one backer board blade. Same with the jigsaw just buy some cheap woodcutting blades, they work fine for a while then just throw away as they wear out.

I now install backer board with a shear and jigsaw to do the cutting. Also don't buy cement board screws, GRK screws are way better and never slip.

I can offer many other tips, have installed 30 or so showers and have a pretty good system down.

G

Philphoto
05-27-2012, 10:37 PM
I had the special blade that I got at a garage sale -- 8" and my saw is 7 1/4".
Oh well!
Anyway I have a Bosch Jig Saw and lots of blades. Tried it out and seems only the name -- cement board -- is different. Cuts like wood -- maybe dustier. I have a few parts to cut for this project. Got the cement board at our salvage store for $1. about 2 each 2' X 4' pieces. Did not want to spend a bunch of cash on a small project.
I will post some photos when I get done. I am building a clipper blade sharpening unit. Need something that does not catch fire. Thus the cement board.
Thanks again!
Phil

Art Rudi
05-28-2012, 06:41 PM
Phil,
I have saved a lot of 7 1/4 blades (40 & 60) over time. I used them for cutting materials such as the cement board, saving a lot of money. Of course, the EZ track is always there to keep my cutting straight. Just make sure you clean the cement dust off the track before its use.
Art

DrJack
05-29-2012, 11:30 PM
I'm doing a bathroom remodel, and have framed in a new shower. From my discussions elsewhere, I have the impression that Hardibacker will cut easily with a score and break approach. That is probably the next step. I hadn't planed on using a circular saw as the tile experts all say it makes too much dust. Kerdi will be applied over top, so I'm not worried about 'perfect' cuts on the backer board (this will be a steam shower).

sean9c
05-30-2012, 12:13 AM
I'm doing a bathroom remodel, and have framed in a new shower. From my discussions elsewhere, I have the impression that Hardibacker will cut easily with a score and break approach. That is probably the next step. I hadn't planed on using a circular saw as the tile experts all say it makes too much dust. Kerdi will be applied over top, so I'm not worried about 'perfect' cuts on the backer board (this will be a steam shower).

You can score and break the 1/4" Hardi pretty easily. The 1/2" takes an awful lot of scoring to make it work, really not practical. I used a grit edge blade in my jig saw, was cheap and worked well. Using a CS makes too
Also used Schluter stuff, also works well.

Lex
05-30-2012, 08:53 AM
I'm doing a bathroom remodel, and have framed in a new shower. From my discussions elsewhere, I have the impression that Hardibacker will cut easily with a score and break approach. That is probably the next step. I hadn't planed on using a circular saw as the tile experts all say it makes too much dust. Kerdi will be applied over top, so I'm not worried about 'perfect' cuts on the backer board (this will be a steam shower).

FYI: If you're using Kerdi, you don't need cement board. It's meant to be applied directly to drywall.

bumpnstump
05-30-2012, 11:15 AM
FYI: If you're using Kerdi, you don't need cement board. It's meant to be applied directly to drywall.

+1
With Kerdi, backer board offers no advantage; regular ol' sheetrock is adequate, and, passes most building codes.
Kerdi is kool....
http://www.schluter.com/143.aspx
Rick

Bryan Parlor
05-30-2012, 02:22 PM
Get a decent dust mask for cutting cement fiber board with a circular saw, paper masks are not recommended for use with silica dust.

http://www.silicosis.com/warnings/index.php.

I score Hardie shingle side (1/4in) with a utility blade, snap it in a workmate and clean the rough edge with the same blade. It also works with the thicker Hardie plank. There is a carbide tipped scriber available. I got mine from Princess Auto for about $10.

Bryan

DrJack
05-30-2012, 11:34 PM
Although Kerdi over sheetrock is approved for steam shower use, there seems to be a thought that doing the backer board is worth it to make it more bullet proof. Just wet the backer first, so the thinset doesn't dry too quickly to get the Kerdi on.

BTW: any good online sources for the Kerdi? It seems that they are working hard to control pricing (which I find irritating).

bumpnstump
05-31-2012, 11:25 AM
Although Kerdi over sheetrock is approved for steam shower use, there seems to be a thought that doing the backer board is worth it to make it more bullet proof. Just wet the backer first, so the thinset doesn't dry too quickly to get the Kerdi on.

BTW: any good online sources for the Kerdi? It seems that they are working hard to control pricing (which I find irritating).

Might dredge up something by searching this forum, or, by asking the question there:

http://www.johnbridge.com/vbulletin/index.php

A great forum for anything tile related.
Also, there are other makers of 'Kerdi' type waterproofing membrane. 'Blanke' comes to mind. The posters on the above mentioned forum can direct you.
Rick

sean9c
05-31-2012, 03:07 PM
I've used the Schluter products including Kerdi, if I was doing it again I'd consider these guys.
http://wedicorp.com/
Daltile is a distribtor, in my area anyway

Gabe O
05-31-2012, 10:16 PM
I now use these to cut hardiboard. They are the best way to go,and I have tried all of them. The only downside is cleaning up the curly waste, and you have to cut from the backside on prestained/painted siding.

http://www.dewalt.com/tools/metalworking-shears-d28605.aspx

Also I use this to seal a shower. One bucket goes a long way.

http://www.laticrete.com/architects/products/waterproofing.aspx

Glue all joints with pl4000 adhesive, for a crack free shower.