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-   -   Pre-hung door for 5" walls (http://www.diychatroom.com/f14/pre-hung-door-5-walls-181494/)

jkk 06-08-2013 11:39 AM

Pre-hung door for 5" walls
 
Trying to install orehungs in a 5" wall. Walls are 2x4 but plaster over drywall.

Can I use std 4 9/16" orehungs for this somehow? Do I need ham extensions? If so, do box stores carry extensions? I could use doors for 2x6 walls but then I think I'd have cut the jambs to fit the 5" wall.

joecaption 06-08-2013 11:44 AM

Just as easy and cheaper to make your own extentions.

woodworkbykirk 06-08-2013 03:55 PM

as joe said it is easier.. just make sure you set the hinge side flush to the wall then fur out the opposite side. if you do it the opposite way.. the hinges will rub on the extension

your other option is to nix the prehung idea and make your own custom jambs

jkk 06-29-2013 07:21 AM

Quote:

Originally Posted by joecaption
Just as easy and cheaper to make your own extentions.

Did just that, using mdf, 18 ga brads every 4" to keep mdf aligned to jamb. Leaves a slightly noticeable line/ joint but looks great.

woodworkbykirk 06-29-2013 03:49 PM

when you put extensions on, its actually better to create a reveal instead of trying to keep them flush.. that way it looks like its supposed to have a shadow line

CarpenterSFO 06-29-2013 04:07 PM

Quote:

Originally Posted by woodworkbykirk (Post 1209014)
when you put extensions on, its actually better to create a reveal instead of trying to keep them flush.. that way it looks like its supposed to have a shadow line

:thumbsup: A reveal is a finish carpenter's friend, every day.

Keith Mathewson 06-29-2013 09:16 PM

Given that you know what you can get off the self won't work why don't you make a jamb that will be correct instead of just cobbling something on.

hand drive 07-04-2013 09:39 AM

by my calcs, two sides of plaster at 1" thick each gives an extra 2" to the wall thickness so it comes out to be the same size as a 2x6 wall and then you have drywall on that so your wall should be 6 1/2" thick which is the thickness of a 2x6 wall with drywall on both sides. is this correct? if so a 2x6 door would work though I'm a carpenter and am not against making custom jambs for everyday doors made for 2x4 walls.

CarpenterSFO 07-04-2013 12:06 PM

Quote:

Originally Posted by Keith Mathewson (Post 1209143)
Given that you know what you can get off the self won't work why don't you make a jamb that will be correct instead of just cobbling something on.

Jamb extensions aren't "cobbling something on" - it's normal trim carpentry. If you're buying pre-hung doors, especially stock from a big box or a lumberyard, they're probably 4 9/16. So you add extensions.

oh'mike 07-04-2013 03:19 PM

Adding jamb extensions is not difficult if you have a table saw---

Building custom jambs and cutting in the hinges is a good solution if the work is high end or the frames are to be stained---however that is some fairly advanced carpentry.

Keith Mathewson 07-05-2013 08:14 PM

IMO as a finish carpenter for some years, making your own door jambs is not, or shouldn't be considered, a particularly difficult task. I don't think that pre-hungs were even available prior to WW11 and would have been considered a normal part of a finish carpenters job. Most of the jobs I've worked the doors were ordered from a door company and were ordered with the wall width in mind or they were made onsite. That said I understand that many carpenters do add extensions but, again IMO, would be well served to consider making them to fit the opening rather than nailing on a filler strip.

Millertyme 07-05-2013 08:39 PM

This is why they make split jambs

jkk 07-05-2013 10:08 PM

No offense at all to the professional craftsmen here, and my goal is always to do a good job, but my rules are 1) houses are primarily for shelter and 2) I'd rather have the extra time to invest ( ie train) my children, which is what I value.

woodworkbykirk 07-06-2013 09:31 AM

Quote:

Originally Posted by Keith Mathewson (Post 1212095)
IMO as a finish carpenter for some years, making your own door jambs is not, or shouldn't be considered, a particularly difficult task. I don't think that pre-hungs were even available prior to WW11 and would have been considered a normal part of a finish carpenters job. Most of the jobs I've worked the doors were ordered from a door company and were ordered with the wall width in mind or they were made onsite. That said I understand that many carpenters do add extensions but, again IMO, would be well served to consider making them to fit the opening rather than nailing on a filler strip.


pretty much all the high end finish guys i know, myself included build their own jambs reason being the quality of prehungs is horrible these days. the quality control in the plants is terrible.. the hinges arent mortised consistantly, the header of hte jamb is cut too long or too short to get the same margin on both sides.. in the last 3 years ive hung only a handful of prehungs and every time ive spent more time pulling hte frame apart to cut the header to the correct size, or remortising the hinge gians. or even worse having to bend the hinges in order to get the door to operate correctly


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