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Hello,

As per my other thread, I'm putting up some fiber cement shingles to replace the original asbestos ones. I'll have to go around some windows, so I'm wondering what's the best way to cut the 90-degree angle that's needed for the corner of each window and/or boxes for outlets.

I've got power nippers, but they seen to mash the shingles (probably better for planks). I've also got everything from a jigsaw, rotatary tool, and even the old guillotine shingles cutters.

Can I just use the jigsaw with carbide blades? I know that dust is a concern.

THANKS!
 

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Yes the dust is a PITA...and you need to protect your self. A couple of things I've used to cut Hardi shingles is a diamond cement blade in a 4" angle grinder and a Rotozip with a tile or drywall bit. For straight cuts I prefer the angle grinder. And yes the dust is horrible...but the cut is fantastic. I usually take a small piece of cut-off and rub along each side of the cut to remove the fuzz.
 
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