B ill Hamilton has been in the roofing business for nearly 20 years. During that time he’s worked with a number of different types of roofs. But in the fall of 2002, Hamilton came across a project that just wouldn’t be suited to what he was used to in the past. The 60-year-old home in the East foothills of San Jose, California has four different levels. Three of the sections were tar and gravel and the fourth was covered in spray foam.

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