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Installing a Pair of Doors

In two previous articles, I described techniques for installing a single door and a sidelight-door-sidelight unit. In this video, I use the same techniques to install a pair of doors, because a pre-hung is a pre-hung is a pre-hung.

Installing a Pair of Doors-1

(Note: Click any image to enlarge)

Regardless of what type of pre-hung unit I’m working with, it’s still a pre-hung unit and I’m not hanging the door. When I hang a door, I scribe it to fit the jamb, I plane it and cut it to the scribe lines, I mortise for the hinges, bore for the lockset, and hang the door on the jamb. In other words, I cut the door to fit the jamb.

But when I’m installing a pre-hung unit, the door is already hung—already cut, hinged, and hanging in the jamb. Which means the door can’t be adjusted to fit the jamb and the jamb must be adjusted to fit the door.

Uniform Hinge Gaps-1

To adjust a jamb so that it fits a door, you have to make critical adjustments in the hinge jamb, especially right near the hinge locations. If you begin the installation by plumbing the hinge jamb, then nailing the jamb near the hinges, you will never be able to make those critical adjustments, especially with a pair of doors.

Follow the simple step-by-step process in this video and with very little effort, you’ll have a pair of doors that fits perfectly…

Flush Meeting Stiles-1

…both doors will be flush at the top, flush along the meeting stiles—from the top of the doors to the bottom, and all the hinge gaps will be uniform.


19 Responses to “Installing a Pair of Doors”

  1. Walter Sydoriak

    Excellent presentation. I’ve learned a lot from Gary over the years, from his trim and finish books to his videos. Thanks Gary!

  2. Joe Dokes

    Cross leg. I could never figure out why my doors didn’t hang perfect. I could get them close but never perfect. No one else noticed the slight imperfections but I did / do.

    The techniques in this video will help me get a LOT closer to perfection.


    Joe Dokes

  3. David Pugh

    Gary: Again you have done a great job describing a complicated process in way we can use and remember. You are making us all into experts. Thanks Gary. You may be the best person ever to happen to our trade.

  4. David Natk

    Great video as always. Sometimes it is the smallest tips that make the largest difference. Thank you. I have to ask Gary, what is the model on that impact gun? I have been waiting for them to make one but I have still not found one. I could only see on the top of the gun it says impact on it?!?!?

    • Gary Katz

      Thanks David. I’m glad you found something useful in the video.
      Festool has only made one impact driver, and I don’t think it went over very well. It’s pretty big and heavy, and not nearly as ‘sweet’ as a Makita.


    Hi Gary, is been a while since I’ve had to install a new pair of doors. Lately it seems like all my door work is correcting hinge bound or cross-legged doors on new homes that usually aren’t more than a year or two old and still on warranty. If only the original installing carpenters would stop nailing through the darn shim, just like you mention in the video. Please bring you road show to Las Vegas and spread the word!

    Thanks so much for all your efforts training the next generation of Carpenters.

  6. Nolan

    Thanks for the video Gary. Correcting cross-leg for me usually doesn’t allow for sledging over walls. Instead I have to go the dirty way of smashing drywall and cheating the jamb at all four corners. We use architectural hinges that do not include long screws. Instead I drill a hole at the door stop location before the door stop is installed. Obviously that doesn’t allow for later adjustment. If I’m particularly worried about future adjustment I’ll drill behind the hinge. As a habit when I’m first shimming, I nail above and below the shim.

  7. William Fisher

    After installing the screws and doing the final shimming, do you nail these last shims? If not, what keeps them in place?

  8. Tim Rogstad

    Wow! I have all of Gary’s videos and have seen him multiple times at the Journal of Light Construction conferences back in the day. He’s been my main source to learn finish carpentry over the years (I’m just a home owner and do all my finish work after I saw a “finish carpenter” do sloppy work and decided that I could do as well or better.) I haven’t done anything for a while, and haven’t watched a Katz-video recently until now. We have to all agree: this man has the pedagogy down! I forgot how good Gary is. Jeez! Thanks Gary…you’re the man!

    • Tim Rogstad

      By the way, when I went to Gary’s presentations at the Journal of Light Construction conference (JLC Live), his helper was a young Dan Parish! He now owns Millworks By Design and does killer work.

  9. Rob Caron

    Thank you Gary for a great series of videos. I run a custom exterior door shop, building over 1000 doors a year. For our customers installing their own doors I recommend your series to them. If I could only get my installers to watch them as well,……

  10. Wilson Primo


    Thank you for sharing all this information on this post, it is very instructive and educational. I myself have a carpentry company and I would recommend my team to watch this to improve their technique. I saw you at the Katz road show and you were great.

  11. Jim Hough


    Thank you for the great techniques over the years. The cross leg situation is nearly always needed to be corrected for door installations. I have also experienced twisting the jamb of windows and doors when I do not use opposing shims for a flat shimming surface. This is something to consider during the installation.

    • Gary Katz

      Totally true how you can twist a jamb if you don’t use opposing shims. But you don’t have to worry about that when you shim behind the to of the hinge jamb or strike jamb directly across the head–the head jamb prohibits twisting. Same with the bottom legs of the jamb if there’s a factory installed threshold. But really, if you prep the opening so that the corrected rough opening is 1/8″ wider than the O.D. of the jamb, and you use a single shim, the jamb shouldn’t twist very much anywhere! :) You’re not the first one to point out how important it is to use opposing shims, and I totally agree, but it’s not always necessary, not always a hard-and-fast rule.

  12. Jeff Koehler

    Always great to sit with my coffee and learn from a Master! My question is regarding the tweaking of walls in cross legging. What keeps the wall in position after sledging and making adjustment?

    Thank you!

  13. Todd

    I’ve tried installing 2 doors in the past and neither where a success. They shut and locked, but one needed a little extra force and the other had a squeak when rubbing the jamb. I watched your videos on Youtube and tried installing two doors in our addition. They came out perfect. They are smoothest doors in the whole house. I followed your specific pattern of when to screw each part. Thanks for sharing your knowledge.

  14. Rick Stence

    Of the many “Installing French Doors” instructional videos that I’ve watched, yours is far and away the best. Your methodical approach and clear explanation have convinced even this inept
    do- it- yourselfer to successfully tackle a job like that. Thanks.


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