Re: Wood sheathing differential weathering reasons

Tony Thompson

Brian Stokes wrote:

I found Andy's post fascinating and very educational. One thing I still don't understand though is how the board weathers in this way when it is painted. How does the paint weather from the softer rings faster - as can be seen clearly in that MOW photo where there is no paint at all on the soft ring sections vs. the harder part of the ring. 

       Some moisture will penetrate through paint, but more importantly no paint layer is ever without pinholes. The wood under that coat of paint is certainly being affected by moisture, just much less than if it was unpainted. As they say in the coatings business, a coating only delays "the evil day" of failure.

Tony Thompson

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