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.
How Long Materials Last The industry wide estimates of how long different roofing materials last are given below: Asphalt Roofing shingles last 15 to 20 years Concrete or clay tiles typically last at least 20 years Wood shingles are good for 10 to 40 years Metal Roofing shingles or panels last 15 to 40 years Slate lasts for 30 to 100 years Now, you may be wondering why there is such a huge spread in how long different classes of material last.