roof overhead

まずは記事を引用します。


In more homes, the roof overhead is rented

Many metro areas have seen significant increases in rented single-family homes since 2006, Census Bureau data shows.

In the aftermath of a historic housing bust, rented single-family homes are on the rise in communities from coast to coast.

At least a fifth of all occupied single-family homes were rentals last year in 32 of the nation's top metropolitan regions, according to a USA TODAY analysis of U.S. Census Bureau data. That's up from seven metros in 2006.
(USA Today. October 20, 2013.)


タイトルに出てくる、


(the) roof overhead


という表現に着目したいと思います。

文字通りに訳せば、頭上の屋根、となるかと思いますが、これは“家”を意味する表現として定着しており、メトニミー（換喩）の一種であると考えることができます。

この表現は、"overhead"の代わりに"one's head"となることもあります。


Like any loan secured by a lien on your home, an equity credit line does create the risk of losing the roof over your head if you can't repay.
(Chicago Sun Times. 1993.)