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 A do-it-yourself drop ceiling in an average room requires about $300-$400 in materials (depending on the ceiling tiles chosen) and around two days of work, according to AlsNetBiz.com.hopping for a drop ceiling: 1  Most often drop ceilings are installed during a basement remodel, to give the room a finished look while still providing relatively easy access to ductwork, pipes or wiring under the tiles.