For the letter "Getting Things Right" (12/06), you show a picture of fiber-cement lap siding (reprinted at left). Looking closely, I see what looks to be a J-clip of some sort — it's at the bottom of the butt joint in the siding. I'd like to know what this is. We've been having problems with buckling of fiber-cement siding, and I wonder if the clips might provide a more secure attachment.

T.J. Parent Queen Creek, Ariz.

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