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Concrete & Masonry
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That nominal dimension is the door size, actually the interior of jambs. The door is usually 1/4" to 3/8" smaller in width than the 32". The rough opening is generally 2" to 2.5" bigger both ways.
 

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Concrete & Masonry
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3,919 Posts
II Weeks, I agree with what you're saying, but I meant a good way to measure an existing door is to measure the actual door slab, which in this situation should be about 31 5/8" to 31 3/4", which = 32" prehung. It seems people get lost sometimes & think they have an odd size because the door doesn't actually = 32".
 
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