Interior Door Extensions

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Posted by: from Coatsburg
11/9/2011 at 1:23:02 PM

I had a new interior door hung last summer and the contractor installed jamb extensions on the wrong side of the jam on the hinge and strike side. What is the correct side to install jamb extensions?

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Date/Time11/12/2011 at 11:58:11 AM

Your post didn't say, but typically this problem occurs with basement entry doors where the walls are 6 to 8" thick. The best thing would have been to have the right door installed in the first place. Typically, entry doors think they are going in a typical 4" stud wall, however doors can be ordered to fit the larger wall thickness without jamb extensions or jamb extensions that were installed by the door manufacturer.

What problem are you having with the interior jamb extensions?


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Date/Time12/16/2011 at 10:16:55 AM

Sometimes in older homes interior walls are thicker than newer homes. This is due to the thickness of the framing and wall board materials. Old home 60 + years were built using rough cut lumber meaning that a 2x4 was actualy 2" x 4" not 1.5" x 3.5". Also the plaster could be as much as an inch thick. This causes the need for jamb extension or a custom jamb orderd with the door.

If the door was purchased at a retailer like depot etc. then the jamb is the standard 4 9/16. Adding an extension is a normal practice which saves money and time versus sepcial order but the extensions should be installed on the opisite side of the hinges and strike plates. This will keep the added depth away from intruding with the door knob and marking or denting of the extension.

I hope this answers your question.

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