For example, if you had a batch file called stuff.bat and you typed stuff a b c d at the command prompt, the letters a, b, c, and d would be assigned to the variables %1, %2, %3, and %4, respectively.
Fiberglass shingles generally have a longer life expectancy than do asphalt shingles. Properly installed tiled roofs have a normal useful life of 20-30 years or longer, but individual pieces can become cracked or broken or the nails rust out.
heres the honest answer: A 20 yr. asphault/fiberglass shingle in so. florida will last 12-14 years, i dosent matter where you live 20 yr, shingles doesnt last 20 years. A`30 year will not last 30 years. Go with a metal roof, more bang for the buck, lots if choices.