Instead of being smooth and nearly featureless like a kidney or spleen, the cerebral cortex (the thin layer of gray matter forming the outer surface of the brain) is chock-full of wrinkles and folds.Click on the image above for a larger view.nstead of being smooth and nearly featureless like a kidney or spleen, the cerebral cortex (the thin layer of gray matter forming the outer surface of the brain) is chock-full of wrinkles and folds.
Depending on the type of your roof, geographic location, and the company or weekend warrior you choose to hire, the total installed cost of a composition shingles roof could vary between $2.75 to $7.50 per square foot installed.
These prices include installation but not tear-off of the old roof. 1  Built-up roofs cost anywhere from $200 to $700 per square. 2  Single-ply flat roofing costs about $150 to $400 per square.3  Spray polyurethane foam roofs cost about $300 to $500 per square. 4  Asphalt roll roofing usually costs about $150 to $400 per square. Spray polyurethane foam roofs cost about $300 to $500 per square. 2  Asphalt roll roofing usually costs about $150 to $400 per square. 3  Flat metal roofs usually cost $500 to $1,000 per square.