"MiamiCuse" wrote in message
...
If I want to accomodate a standard 30" x 80" door prehung, what kind of
rough framing do I need to do to accomodate it?

I would assume the door is 30", the door jamb will add 3/8" on each side
to make it 30-3/4" assuming a 1/2" of play to level and shim the door, I
should frame it with a rough opening width of 31-1/4". Height wise, the
door is 80", assume again a 3/4" jamb depth, plus another 1/2" for play,
also assume a tiled flooring with thinset and tile to be 1/2", we have a
total height of 81-3/4". So the rough opening should be 31-1/4" x
81-3/4". Am I correct?

A quick Google search would seem to indicate that will be a little on the
small side- this site recommends 32x82 3/4. (
http://ezinearticles.com/?Rough-Open...oors&id=267777 )
Most jambs are thicker than 3/8, so that explains the difference.

I don't remember what the 'standard' sizes are off the top of my head, but
the best way to be SURE is call or visit your supplier, and look in the
catalog or at the tag on the door, and maybe pull the tape off your belt and
double check. The catalog or tag on the casing will give the RO
requirements. Some prehungs require a higher opening to accommodate the the
'ears' at the top of the side jambs, since the top jamb fits into a rabbit
on the sides. (This is mainly on exterior doors.)

If in doubt (like if the doors are special order), make the RO a little
oversize. It is a lot easier to add shim stock, than to enlarge an opening.



aem sends...