Rocks are placed on commercial flat roofs for many different reasons:
There are some benefits to having rock on a flat roof, especially if it is a black rubber or asphalt roof, as it adds additional reflectivity and protects the substrate from UV rays. However, with the advancements in elastomeric roof coatings, it is much better to go with a highly reflective white roof coating over rock. Look into the Reflective Roof Coating Institute's study on reflectivity and energy efficiency.
Jason Popovich
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William Rottman (www.williamrottman.com) but it is only for the commercial. There is no full version of the song because it is actually sung by three women in fiddler on the roof and its lyrics further on intend it is supposed to be sung by a girl.
Some services that Johns Manville provides are : manufacturer and marketer of premium quality building insulation, commercial roofing, roof insulation, and speciality products.
Mass stamper is a weight placed inthe roof of a building motion sensors decect building movement duiring an earthquack and sed message to a computer.The computer then singnals controls inthe roof to shift the mass dampet to counteract the building;s movement....................and it's not "mass spamper" actually it's "mass DAMPER"
The electric field that would throw them back on the roof is what prevents tributes from jumping. This is probably placed so that none of the tributes can commit suicide or escape before, or during, the games. The Capitol doesn't want tributes to die before the games so they can watch them die for entertainment, or need to get another tribute last minute.