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.
1 To install asphalt shingles, a base is laid down, then the shingles are nailed, tarred or locked into place in an overlapping fashion. 2  ThisOldHouse.com provides a how-to video for replacing an asphalt shingle roof. According to RoofHelp.com, the average lifespan for 20-year asphalt shingles is about 14 years in Phoenix, Arizona; 19.5 years in Minneapolis, Minnesota; and 20.8 years in Reading, Pennsylvania.