We installed our FL mobile Certainteed Dutch Lap vinyl siding in 2006 over 30 year old aluminum white siding with 1/2" backing between the two sidings.
In 2009, the siding was warping on the lower half of back side. In 2010 we replaced that side with new same brand and color. Again, the lower half looks wrinkled/melted. The backing was installed correctly. We and the manufacturer are stumped for a solution. Any suggestions, thoughts, solutions?