Hey go up on the ruff what the fuck is a ruff you ignorant yankee.
Roof or ruff.
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As for why well as in with many things in language that s not really an answerable question.
That s just how it s pronounced people learn it from their parents and from other people around them.
The degree of diphthongization of the vowel varies regionally but ruff for roof i ve never heard.
It is phonetically pronounced as both roof and ruff depending on colloquial variation.
Roof that thing above your head as you sleep that protects you from the weather and flying monkeys.
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Northern us accents tend toward the long foodish one southern accents tend toward the bookish one.
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The prefered pronunciation is as roof.
Not to be pronounced ruff because only someone from the south with low levels of education would say something that asinine.