Top States. Bureau of Labor Statistics data show that forensic science technicians in the District of Columbia lead the nation, with $74,050 in average annual earnings in May 2011. Workers in Illinois made $73,290 on average, crime scene investigators in Virginia earned $71,140 and workers in California made $68,880.alifornia employed the greatest number of forensic science technicians of any state, followed by Florida, where workers earned $46,820 on average. Arizona had the highest concentration of investigators after the District of Columbia, and workers in Arizona earned $55,110 a year on average.
While more expensive than asphalt, metal roofing lasts longer and is more wind resistant. Materials: May be composed of steel, aluminum, copper, or zinc alloy. Steel roofs come with either a zinc coating or painted finish. Copper roofs are installed unfinished and acquire a protective green patina with age.
Depending on budget constraints and the shape and slope of roof that needs to be worked on, options vary. One type of roofing material commonly used is roll roofing. Roll roofing works like traditional shingle-clad roofing to protect the underlayment of the roof's structure. There are many reasons why contractors choose roll roofing.