Well, I thought I had found my dream material in Hardie board but I guess not. Their web page says it must be painted. I thought since it was a concrete based product that you could put it up and forget it.
I sheathed my house in clear heart redwood and am pretty happy with that but it does have some drawbacks and has turned out not to be maintenance free either. Close, but not close enough.
I could do my (detached) garage in redwood. I like working with it whereas I don't think I would like working with the Hardie board what with the dust problem. I could go with metal, already have a metal building/barn, but would rather not.
So the question is what is the thinking on leaving hardie board unpainted? What would happen? And more importantly, since I am not in the profession I could use some input on material options I might not be aware of.
Finally, when I built my deck (Ipe, or Brazillian Walnut) I considered using the new (to me) composite decking made out of cedar/plastic composite material. I picked up a piece of this stuff and left it on the ground for six years or so and it is still intact. A little weathered, but not cracked. A piece of pine would be gone in a year from termites, sun damage, etc. Anybody ever try to adapt this stuff to siding? As far as I know it only comes in 1 1/2 inch thicknesses.
Cosmetics is not really a concern, by the way. My place is VERY isolated, a mile from the county road. I just want to put it up and forget it.