Their purpose is to implement Boolean Logic. You might notice the correspondence to Binary Semantics and thus Binary (number system) logic & mathematics. Special fun: OR and XOR (exclusive OR).
Geographical Considerations: While most contractors will price their asphalt shingles roof replacement services within $4.00 to to $7.00 per square foot or $400 to $700 per square range, there will be significant geographic variations.
The Price of Shingles. To begin, you need to measure your roof. Shingles are priced per square; a square is defined as 100 square feet. Asphalt shingles, which consumers use the most, can cost from $50 to $150 per square.The popular clay tiles that create a Mediterranean look run as much as $500 per square, while concrete and metal shingles vary from about $100 to $600 per square.sphalt shingles, which consumers use the most, can cost from $50 to $150 per square. The popular clay tiles that create a Mediterranean look run as much as $500 per square, while concrete and metal shingles vary from about $100 to $600 per square.