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Old 03-22-2008, 10:08 PM   #1
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Installing a Prehung Door

I've been looking into doing this for a while, measured the door I want to do, did a lot of research and got what I thought was a great door. It fits nicely into the frame, however the door jambs are too big. Some of the jambs in the house measure to about 4 1/2", while two of them measure only 3 1/2. I don't think I've seen any doors that are made to this smaller size. Are there doors out there, or is my only option to cut about an inch off of the jamb of the door?


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Old 03-23-2008, 03:59 AM   #2
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I'm not a contractor, just a long-time DIYer, but here's my 2 cents until one comes along.
Your finished interior walls should measure roughly 4.5" to 4.75" thick counting the drywall on both sides. (A modern 2X4 is 3.5" plus usually .5" or 5/8" sheetrock on both sides.)
Before nailing or screwing anything, raise it up level across the top with temporary blocks and shims at the two bottom corners, and use beveled shims on the sides to plumb it (cedar shingle strips work well).
I do the hinge side first.
Good luck!


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Old 03-23-2008, 06:58 AM   #3
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I removed the old door jamb, and compared it to the new door, it is about an inch off. Measuring the open hole, the dry wall is about an inch total, the beam in the center is around 2 3/8, giving a total of 3 1/2". I own a house that is about 33 years old, and many things in it seem to be non standard. Is there a different size door jamb out there that will fit, or do I need to cut the one I already have down about an inch?
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Old 03-24-2008, 03:40 PM   #4
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We just ordered interior doors with 3-1/2" jambs. Had to pay extra since the 3-1/2" is not standard, plus we needed a Kerf. We needed 3-1/2" jambs since our drywall will "return" into the jambs. So you can get them, you just have to order 'em that way.
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