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-   -   Best blade for circular saw to cut multiple layers. (http://www.diychatroom.com/f19/best-blade-circular-saw-cut-multiple-layers-58299/)

Clutchcargo 12-01-2009 04:30 PM

Best blade for circular saw to cut multiple layers.
 
I'm adding a beam and hangers to remove a load bearing wall.
I need to cut a path in my ceiling using my dust collecting circular saw to gain access. I'm hoping that someone has a suggestion for a wrecking blade.
I don't want to go at it with the sawzall because I need to live in the area that I'm working in and it tends to throw dust and grit everywhere.
The ceiling had been redone many years ago and now there are 4 layers that I need to cut through… newer plaster, metal lath, old plaster, and finally wooden lath.
What is best blade for this?
I was thinking of using a diamond coated tile blade but I’m worried the metal lath will dull it pretty quick.
TIA

Clutchcargo 12-02-2009 07:57 AM

It looks like I may just have to suck it up and make a mess with a sawzall. That metal lath is not easy to remove especially when you can't fully plunge the blade because I'm cutting perpendicular to the joists.

Scuba_Dave 12-02-2009 08:09 AM

I've used a reg wood cutting blade on junk wood w/nails
Not sure how that would stand up to metal lathe
Used a hatchet on metal lathe at my mom's years ago before I had any tools
It was a mess

stadry 12-02-2009 09:17 AM

carbide OR diamond-tipp'd rip blade,,, might be more than you care to invest but it'll last 1/2way to forever

Thurman 12-02-2009 10:16 AM

I'm with IRC on this. I've used like, maybe a new 40T carbide tipped blade to cut out plaster/metal lath ceilings and the old wood lumber joists. Plan your cut! We hung plastic to the ceiling of the room on four sides of the cut area to create a work room, then placed a shop vac hose in there for dust control and carefully cut away. My first attempt with a 24T blade resulted in the metal lath hanging up in the teeth, the 40T (I'm pretty sure of the count), and moving a little slower worked much better. Please wear a good respirator. Good Luck, David

Paulie 12-02-2009 08:27 PM

Remember that respirator, that dust will take years off your life, not to mention the potential lead paint hazard.


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