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Re: fiber cement siding in cold climates
Here are a couple of photos of cement board siding that suffer clearance problems; too close to roof plane
Hardie started out with a 2" minimum then went to 1" to 2" and is now back to the 2"s
This is caused by the product has the ability to absorb moisture and the fact that it does not dry out that fast gives us a problem when coupled with freezing temperatures.
Moisture expands 9% when it freezes and this will expand the siding allowing it to take on a little more moisture. On a sunny day in the winter you can have multiple freeze, thaw cycles. Let this go on for somewhere in the two to three winters range and you get the problems that my pictures show.
Mark
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