Replacement door jamb measurements

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jstrez77
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Replacement door jamb measurements

Post by jstrez77 » Sat Dec 22, 2018 1:32 pm

I think I've read when buying a replacement door, you want a jamb that is the length of your wall + 1/8. So our wall is 2x4 + 3/8 drywall = 4 1/4. So I should get a jamb that is 3/8 wide but this seems unusual size. Our current jamb is 4 1/2. What is the correct jamb with when 3/8 drywall is used

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Shannon
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Re: Replacement door jamb measurements

Post by Shannon » Sat Dec 22, 2018 2:12 pm

Jambs are available in 4-1/2" which is standard for 2x4 walls with 1/2' material (drywall or plywood) on each side. That is all you will find. If you want it narrower you will have to trim it down but in most cases there is no reason to as it will work fine even though you have 3/8" drywall.
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jstrez77
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Re: Replacement door jamb measurements

Post by jstrez77 » Sat Dec 22, 2018 3:00 pm

OK, all I can find at the big box stores are jambs that are 4 9/16 and it sticks out pretty far out from the wall

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A. Spruce
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Re: Replacement door jamb measurements

Post by A. Spruce » Sat Dec 22, 2018 3:04 pm

You can plane it down with a hand plane, glue scraper, or belt sander, you will just have to be extremely careful to keep a square and flat edge.

Being a bit proud of the wall is actually a good thing, it's easier to install the trim and caulk a small gap than it is to add jamb extensions or modify the drywall to get the trim to fit.
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jstrez77
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Re: Replacement door jamb measurements

Post by jstrez77 » Tue Dec 25, 2018 12:29 pm

Seems like that would be easy to screw up. What about adding a board behind the trim so that way I don't have to cut the jamb at all?

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A. Spruce
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Re: Replacement door jamb measurements

Post by A. Spruce » Tue Dec 25, 2018 12:42 pm

Hold the trim in place and take a picture of the gap for us.
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jstrez77
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Re: Replacement door jamb measurements

Post by jstrez77 » Thu Dec 27, 2018 10:43 am

I didn't install it yet. Do you think I should wait the 10-15 days to get a door with a 4 1/2 inch jamb, or you think that 4 9/16 will be fine? I just didn't want to do a bunch of extra work if I didn't have to. I have purchased 4 9/16 before but it sticks out over 1/4 inch and the trim isn't flush so I had to put shims behind the trim to line it up and then caulk

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A. Spruce
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Re: Replacement door jamb measurements

Post by A. Spruce » Thu Dec 27, 2018 1:09 pm

IMHO, waiting for and paying for a special order door that is only 1/16" narrower jambs isn't worth anything. You will not see any difference in trim gaps with 1/16", especially when you say the door stick 1/4" out. If you are going to special order a door, then you need to know what the widest part of the jamb needs to be and order THAT dimension.

Is this by chance a mobile home?
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Shannon
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Re: Replacement door jamb measurements

Post by Shannon » Thu Dec 27, 2018 6:03 pm

I agree unless you wanna order it to the exact size you need there is no point waiting or paying formonenthagbis still not exactly correct for your set up. That being said I don’t think it is worth ordering a custom size for this project anyways.
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jstrez77
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Re: Replacement door jamb measurements

Post by jstrez77 » Fri Dec 28, 2018 1:21 pm

OK, I'll go with the standard door and take a pic once I start installing. Not a mobile home, just an older home

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