A type of inexpensive siding widely used in the early 2000s, paired with the rainy Pacific Northwest, created a storm of construction claims, contractors board administrator Craig Smith said. Liability insurance costs increased 165 percent between 2003 and 2004. Something had to be done, he said.
The Oregon Legislature in 2007 directed the board to create a series of classes for residential contractors, specifically addressing the construction defects. Commercial contractors are subject to a different set of requirements outlined in the state statute.

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References http://www.oregonlive.com/small-busi...dont_need.html

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