Ballast

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Ballast

Informal; anything that helps bring balance to an economy or company. For example, if strong auto sales lift an otherwise stagnant economy, it may be said to be a ballast preserving GDP growth. The term refers to the weight that helps balance a ship at sea.
References in periodicals archive ?
Salim, Mechanics of Ballasted Rail Tracks: A Geotechnical Perspective, Taylor and Francis/Balkema, London, UK, 2005.
The Evaluating the Energy Performance of Ballasted Roof Systems study states that roof systems with ballast at a weight of 17 to 22 pounds per square foot are as effective at mitigating peak energy demand as white-membrane roofs.
By comparison, it's well known that the mass of a ballasted roof can also reduce peak roof temperatures and delay the heat flow into a building; however, since ballasted roofs don't meet the traditional requirements of high solar reflectance and high thermal emittance set out by the EPA and other organizations, they aren't officially recognized yet by the EPA as "cool roofs."