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.
Required Sheathing Thickness for Roofing | eHow Typical types of wood used for roof sheathing are oriented strand board, known as OSB, and plywood, the most popular being OSB. Sheets of 7/16-inch thick,... Type of Plywood Used on Roofing | eHow Traditional plywood is the most expensive sheathing material for roof ...