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 This means that the 240 square feet of ceiling/attic will cost between $360 and $720 to complete; 2  The Walls-wall insulation will require an R15 to R18 value, and this depends upon the presence of exterior sheathing beneath the siding of the home. Should the homeowner require the services of an insulation contractor who uses blown cellulose materials, the costs will double to roughly $3 per square foot instead. 2  This means that the 240 square feet of ceiling/attic will cost between $360 and $720 to complete;