Replies

1. 
   bing0328 | Apr 04, 2024 10:24am | #1

   I've tried to cut Hardie on a bevel, not particularly successful. Hardie really only recommends their 1x4 for o/s corners and 1x1 for i/s corners. Plus cement does not like aluminum; after a couple of years you won't have any aluminum left.

1. 
   beechlandfurniture | Apr 04, 2024 08:36pm | #2

   Good to know. I didn’t realize cement board deteriorated aluminum

2. 
   Oli191 | Apr 05, 2024 05:50pm | #4

   What if you have a mixture of cement with gravel / sand? Would that also affect the aluminium? or at least make it last a few more years?

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   finefinish | Apr 04, 2024 09:19pm | #3

   We have had success mitering Hardie claps, but I wouldn't recommend it as it is extremely time-consuming, not a great weather detail, and fragile when done. If you want a nice low profile outside corner look at Tamlyn online. They make aluminum extrusions of all types specifically for Hardie. Bing correctly noted that light gauge raw aluminum will quickly corrode in contact with cementitious products, especially when water is present. The Tamlyn and Hardie flashings and extrusions are heavier and coated, and the Hardie should all be coated as well so no raw cement meets any raw aluminum. These products will give you a more modern look. If that's not necessarily what you want you could get a fir outside corner profile that was very commonly used in New England to receive cedar shingle and clapboard siding. It was basically a rounded over 2" x 2" with a rabbet on the inside. It was installed first as a 1 pc cornerboard and siding on adjacent walls would butt to it.. it's a nice lighter look than typical 1x 5 or 6.. If you are going for lower maintenance you could make a PVC version too.

1. 
   beechlandfurniture | Apr 05, 2024 09:29pm | #5

   Thanks for the tips. I’ll look into the Tamlyn. We are going for more of a modern clean look without all of the bulky corner boards.