Proper Way Cutting Circle Holes in Hardi Board

This is the manufacturer recommended way to cut holes in Hardi Board concrete backer board. There are of course other ways, but manufacturer recommendations are usually there for a reason.

Link to the classic utility knife $14 for 2:

Fresh utility knife blades $5.50 for 10:

Here's an inexpensive carbide tip scoring blade $16:

[lunarul]

Thank you, I did not want to buy a new tool just for this one hole

[xdually]

The "Proper" the "Longest possible method known to man" way? LMAO

[ChristIsLord]

You can use a grinder with a sponge. But they cannot recommend that method.

[bmcginnis]

Now do it with 1/2 board lol. 1/4 is like cardboard....