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The plant is an independent structure that has a different
type of roof than the adjoining buildings. Because of the
potential of fire from a molten metal explosion, the plant's
122,567-square-foot roof must be made of fire-resistant material.
The roof must also be without leaks as rain water hitting the
molten aluminum could cause an explosion that would spray molten
metal over the plant. Thus, a leak in the plant roof could
result in damage to plant equipment and would present a
significant safety hazard to plant employees.
During 1989 and 1990, Vanalco removed and replaced 1,414
square feet of roof decking and 26,954 square feet of roofing
material. In 1991, Vanalco removed and replaced 23,171 square
feet of roof decking and roofing material. In 1992, Vanalco
removed and replaced 12,927 square feet of roof decking and
roofing material. In 1994, Vanalco removed and replaced 15,145
square feet of roof decking and roofing material.7 Thus, during
the period 1989 through 1994, Vanalco removed and replaced 42,514
square feet of roof decking and 78,197 square feet of roofing
material.
7 Thus, during 1989 and 1990, Vanalco replaced 1.15 percent
of the roof decking and 21.99 percent of the roofing material.
In 1991, Vanalco replaced 18.90 percent of the decking and
roofing material; in 1992, it replaced 10.55 percent; and, in
1994, it replaced 12.36 percent.
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