Is is OK to bend fiber cement and install on a curved surface like
around a bow window? The Hardie site doesn't have any warnings or
instructions about installing on a surved surface. And I've searched
the internet and not been able to find a thing. The product seems
very flexible and doesn't seem like it's under any great strain for
the curve we are looking at (about 1' out over a 12' width).
Like Sheet Rock, Hardi Plank can bend and when wet will take on any shape
that it is laying on or made to mimic.......
When delivered it is best to support hardi plank the entire length or it
will look/conform to the stickers it was set on.
We also use hardi plank for "curved concrete forms"
I would only think that with such a slight radius, the hardi plank would be
fine and look nice with the application below.
One way to check this is to say go to a supplier and look at the scrap pile
of hardi plank (if any) and see if you can find a "bent one"
the other way is to wet one and bend it, dry it, and look.
The material is fiberous, and like any product when bent the outer curved
surface will be more open "thread" and the inner will be compressed.
I would go for it, with a little test prior to installing....
We had a pro doing the work and it seemed to work fine. The only
catch was you can't angle it (like on a straight lap) and bend it to
the curve at the same time. So you end up stepping out the width of
the plank on each layer. There were about 5-6 reveals under the bow
window sill so by the time you go up to the sill the plank was almost
even with the front edge of the sill.
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