1 From the distance from the center of the earth to the peak of the mountain.  As mountains are generally measured from sea level, Mount Everest 29,035 ft (8,850m) is considered to be king. However, there is a difference between the highest and tallest.
You can buy acoustic ceiling tiles in either 2'x2' or 2'x4' sizes. It will cost about $1,000-$1,700 to install an acoustic ceiling system in an average 12'x14' room. Most contractors will charge between $2 and $5 per square foot for labor. A modest set of 12, 2x2 tiles can cost from $25-$40. There are more extravagant tiles which can cost as much as $100 for a set of 12.
1 The Attic-according to the HomeInspectorLocator.com website the costs for insulating an attic to modern standards will run between $1 and $1.50 per square foot, though the costs increase by 100% when the insulation is one of the blown varieties. The sheathing will average around $1.02 per square foot while the R15 cavity insulation costs roughly $.73 per square foot. 2  This means that a total price of $1.75 per square foot is necessary for the purchase of the materials.