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.
Asphalt shingles tend to last for 20 to 30 years. Composite roofing is a type of asphalt shingle, but it has a few variations that offer different benefits. The base layer of felt is often replaced with fiberglass for greater durability and a slightly longer service life. Recycled plastics are also commonly used for the backing and the top layer of the shingle.