Cutting hardibacker

[Zach England]

roto zip

[Rich Engelhardt]

Hello,
+1 on the Roto -Zip.

[Bob Lloyd]

James

A carbide tipped scoring tool is made for that, works great and much less dust than cutting with a power tool and costs about $10. Lowes or Home Depot should have them.

Bob

[matt swiderski]

I've used both the carbide scoring tool and an angle grinder. If your not cutting too much then the carbide scoring tool works great, but if cutting a lot of boards then your hands can get tired (the scoring tool I used didn't have a very large handle). The angle grinder created alot of dust, so if you use one, or any power tools, make sure to wear a mask. Hope this helps.

[Rich Tesoroni]

Hitachi hardiboard blade from Amazon too.

This is an outdoor project on a windy day. I've never seen such a cloud of dust.

Rich

[James Hart]

Thanks for all the help.

I wound up using the carbide scoring tool. It worked pretty well. I only trashed one board when it didn't snap cleanly along the score.

I did use a fortified thinset mortar and fiberglass seam tape where the boards met. Probably a little overkill, but I didn't want to wind up pulling it out.

Jim

[Gary Curtis]

The contractor and crew that built my new house used a Marathon-brand blade in skillsaws. Be sure to wear a dust mask.

Gary Curtis
Northern California