From Longman Dictionary of Contemporary Englishrooftoproof‧top /ˈruːftɒp $ ˈruːftɑːp, ˈrʊf-/ noun [countable] TBCthe upper surface of a roof Spectators stood on rooftops to watch the parade. → shout something from the rooftops at shout1(3)
Examples from the Corpus
rooftop• Police were pelted by stones thrown by demonstrators, some from rooftops, witnesses said.• Tiny birds spent frosty nights sleeping on rooftops and on branches.• Henrietta is in her season, and every tom in London seems to be prowling on our rooftop.• Now I can see rooftops outside the windows as well as open sky.• And the tower is the centre of attention every May morning when the choir sings out across the rooftops.• Across the rooftops, a lone cop prowler was the only thing moving on the cold expanse of the Grand Canal.• Motion at the rooftops of two nearby buildings was up to three times that at ground level.• A cat was up on the rooftop.• Six victims were found clinging to rooftops or swamped cars and hoisted to safety. 