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.
Average three-tab roofs last about 17 â 20 years. Architectural asphalt shingles have additional asphalt making them more durable than three-tab. Warranties range from 20 â 50 years with an actual life expectancy of 30 â 50 years. Metal roofs are extremely durable, often lasting up to 50 years.