rough opening for non-pre-hung door


B

B

I have a 30-inch door slab for which I will build a frame. What size should
the rough opening be? I suppose the opening is not supposed to be 82.5 x
32.25 as in the case of a pre-hung door that would be shimmed into place.
 
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D

dadiOH

B said:
I have a 30-inch door slab for which I will build a frame. What
size should the rough opening be?
(Door width) + (2x frame thickness) + (1") should do it nicely. IOW, width
= 32.5".
________________________
I suppose the opening is not
supposed to be 82.5 x 32.25 as in the case of a pre-hung door that
would be shimmed into place.
Why not? You'll need to shim the frame you make, no?
 
B

B

I guessed that my home-made frame will go into the opening one piece at a
time, and would start with one side piece flat against the rough opening,
and therefore will not get shimmed into place. Is that not the right way to
do a non-pre-hung door?
-B
 
D

dadiOH

B said:
I guessed that my home-made frame will go into the opening one
piece at a time, and would start with one side piece flat against
the rough opening, and therefore will not get shimmed into place.
Is that not the right way to do a non-pre-hung door?
-B

The purpose of shimming is to make the two vertical pieces equidistant and
parallel to each other, perpendicular to the wall and plumb. In the case of
the top piece, it needs to be at right angles to the verticals and
perpendicular to the wall.

You go nailing directly to a stud, you have a snowball's chance in hell of
getting the above. YMMV.
 
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H

Harry K

B said:
I guessed that my home-made frame will go into the opening one piece at a
time, and would start with one side piece flat against the rough opening,
and therefore will not get shimmed into place. Is that not the right way to
do a non-pre-hung door?
-B
It is highly unlikely that the RO framing is (will be) square and
plumb enough to allow that. I have done it but only in sheds where I
didn't really care.

Harry K
 

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