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I am cutting some 1/2" Hardibacker into some 2" x 32" sections. I tried using a 6 TPI wood jigsaw blade but the blades are not lasting very long. Does anyone know if a diamond tipped or carbide tipped would last longer?

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    Yes score and break, if you need to cut a lot of angles like i had to, cheap blades is your best bet. I was able to extend the life of the blades by putting a piece of 3/4 inch plywood on top of the hardier board first and then removing it for another cut. The jigsaw blade then gets worn down in 2 places vs. one. – treeNinja Oct 4 '17 at 13:52
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Score with a utility knife, clamp between scraps of wood, and snap.

If you don't have enough extra length to snap with, the best tool I've found is a grinder with a diamond blade. (Use outdoors with appropriate PPE.)

If you have to use a jigsaw blade, then yes, the grit ones will certainly outlast a wood blade, but not by much. (And maybe not enough to justify the added cost.)

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