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How can I fix this gap between bookcases I made?



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21















I just built two bookcases to line the wall of a room in my house and apparently didn't build them square enough so, when I put them next to each other, I get this giant gap. (I think the one on the right is pretty square but the one on the left appears to lean to the left at the top.)



Any suggestions on how I can make this look better? The shelves are going to be sanded, spackled, caulked, and painted. One thought I had would be to remove the vertical strips of molding where the two bookcases meet (there is 3/4" square molding on all the edges) and make one custom piece that attaches to both. This piece would be wider at the top and taper at the bottom. Maybe that would look bad--I don't know. It also wouldn't address the gap on the top horizontal surface.



enter image description here



Any suggestions would be appreciated!










share|improve this question



















  • 29





    Is it possible that some portion of the gap is due to variation of the floor?

    – Michael Karas
    Apr 7 at 14:15






  • 19





    You should get a tool called a framing square so that you can check squareness rather than guess. Maybe it is possible for you to remove the back of one unit and spring the shelves into square and reattach the back to hold it in the square shape. It is not quite clear how the backs are fabricated and the worst could be that you would have to make a new back.

    – Michael Karas
    Apr 7 at 14:19






  • 3





    @MichaelKaras -- Your comments would make a good answer.

    – Jasper
    Apr 8 at 0:45











  • @MichaelKaras: This is good advice, but I would add: check the framing square for squareness! I once spent a frustrating hour trying to figure out why no matter how I tried, the jig I was building would not come out square. I realized eventually that I was not crazy, it was the square that was wrong. A solid steel square presumably made by professionals was 89 degrees.

    – Eric Lippert
    2 days ago






  • 2





    Now that you've fixed it, please post an updated picture so we can all sleep at night.

    – DavidS
    2 days ago

















21















I just built two bookcases to line the wall of a room in my house and apparently didn't build them square enough so, when I put them next to each other, I get this giant gap. (I think the one on the right is pretty square but the one on the left appears to lean to the left at the top.)



Any suggestions on how I can make this look better? The shelves are going to be sanded, spackled, caulked, and painted. One thought I had would be to remove the vertical strips of molding where the two bookcases meet (there is 3/4" square molding on all the edges) and make one custom piece that attaches to both. This piece would be wider at the top and taper at the bottom. Maybe that would look bad--I don't know. It also wouldn't address the gap on the top horizontal surface.



enter image description here



Any suggestions would be appreciated!










share|improve this question



















  • 29





    Is it possible that some portion of the gap is due to variation of the floor?

    – Michael Karas
    Apr 7 at 14:15






  • 19





    You should get a tool called a framing square so that you can check squareness rather than guess. Maybe it is possible for you to remove the back of one unit and spring the shelves into square and reattach the back to hold it in the square shape. It is not quite clear how the backs are fabricated and the worst could be that you would have to make a new back.

    – Michael Karas
    Apr 7 at 14:19






  • 3





    @MichaelKaras -- Your comments would make a good answer.

    – Jasper
    Apr 8 at 0:45











  • @MichaelKaras: This is good advice, but I would add: check the framing square for squareness! I once spent a frustrating hour trying to figure out why no matter how I tried, the jig I was building would not come out square. I realized eventually that I was not crazy, it was the square that was wrong. A solid steel square presumably made by professionals was 89 degrees.

    – Eric Lippert
    2 days ago






  • 2





    Now that you've fixed it, please post an updated picture so we can all sleep at night.

    – DavidS
    2 days ago













21












21








21


1






I just built two bookcases to line the wall of a room in my house and apparently didn't build them square enough so, when I put them next to each other, I get this giant gap. (I think the one on the right is pretty square but the one on the left appears to lean to the left at the top.)



Any suggestions on how I can make this look better? The shelves are going to be sanded, spackled, caulked, and painted. One thought I had would be to remove the vertical strips of molding where the two bookcases meet (there is 3/4" square molding on all the edges) and make one custom piece that attaches to both. This piece would be wider at the top and taper at the bottom. Maybe that would look bad--I don't know. It also wouldn't address the gap on the top horizontal surface.



enter image description here



Any suggestions would be appreciated!










share|improve this question
















I just built two bookcases to line the wall of a room in my house and apparently didn't build them square enough so, when I put them next to each other, I get this giant gap. (I think the one on the right is pretty square but the one on the left appears to lean to the left at the top.)



Any suggestions on how I can make this look better? The shelves are going to be sanded, spackled, caulked, and painted. One thought I had would be to remove the vertical strips of molding where the two bookcases meet (there is 3/4" square molding on all the edges) and make one custom piece that attaches to both. This piece would be wider at the top and taper at the bottom. Maybe that would look bad--I don't know. It also wouldn't address the gap on the top horizontal surface.



enter image description here



Any suggestions would be appreciated!







woodworking furniture carpentry






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited yesterday









dotancohen

1697




1697










asked Apr 7 at 14:10









johnnyb1970johnnyb1970

613513




613513







  • 29





    Is it possible that some portion of the gap is due to variation of the floor?

    – Michael Karas
    Apr 7 at 14:15






  • 19





    You should get a tool called a framing square so that you can check squareness rather than guess. Maybe it is possible for you to remove the back of one unit and spring the shelves into square and reattach the back to hold it in the square shape. It is not quite clear how the backs are fabricated and the worst could be that you would have to make a new back.

    – Michael Karas
    Apr 7 at 14:19






  • 3





    @MichaelKaras -- Your comments would make a good answer.

    – Jasper
    Apr 8 at 0:45











  • @MichaelKaras: This is good advice, but I would add: check the framing square for squareness! I once spent a frustrating hour trying to figure out why no matter how I tried, the jig I was building would not come out square. I realized eventually that I was not crazy, it was the square that was wrong. A solid steel square presumably made by professionals was 89 degrees.

    – Eric Lippert
    2 days ago






  • 2





    Now that you've fixed it, please post an updated picture so we can all sleep at night.

    – DavidS
    2 days ago












  • 29





    Is it possible that some portion of the gap is due to variation of the floor?

    – Michael Karas
    Apr 7 at 14:15






  • 19





    You should get a tool called a framing square so that you can check squareness rather than guess. Maybe it is possible for you to remove the back of one unit and spring the shelves into square and reattach the back to hold it in the square shape. It is not quite clear how the backs are fabricated and the worst could be that you would have to make a new back.

    – Michael Karas
    Apr 7 at 14:19






  • 3





    @MichaelKaras -- Your comments would make a good answer.

    – Jasper
    Apr 8 at 0:45











  • @MichaelKaras: This is good advice, but I would add: check the framing square for squareness! I once spent a frustrating hour trying to figure out why no matter how I tried, the jig I was building would not come out square. I realized eventually that I was not crazy, it was the square that was wrong. A solid steel square presumably made by professionals was 89 degrees.

    – Eric Lippert
    2 days ago






  • 2





    Now that you've fixed it, please post an updated picture so we can all sleep at night.

    – DavidS
    2 days ago







29




29





Is it possible that some portion of the gap is due to variation of the floor?

– Michael Karas
Apr 7 at 14:15





Is it possible that some portion of the gap is due to variation of the floor?

– Michael Karas
Apr 7 at 14:15




19




19





You should get a tool called a framing square so that you can check squareness rather than guess. Maybe it is possible for you to remove the back of one unit and spring the shelves into square and reattach the back to hold it in the square shape. It is not quite clear how the backs are fabricated and the worst could be that you would have to make a new back.

– Michael Karas
Apr 7 at 14:19





You should get a tool called a framing square so that you can check squareness rather than guess. Maybe it is possible for you to remove the back of one unit and spring the shelves into square and reattach the back to hold it in the square shape. It is not quite clear how the backs are fabricated and the worst could be that you would have to make a new back.

– Michael Karas
Apr 7 at 14:19




3




3





@MichaelKaras -- Your comments would make a good answer.

– Jasper
Apr 8 at 0:45





@MichaelKaras -- Your comments would make a good answer.

– Jasper
Apr 8 at 0:45













@MichaelKaras: This is good advice, but I would add: check the framing square for squareness! I once spent a frustrating hour trying to figure out why no matter how I tried, the jig I was building would not come out square. I realized eventually that I was not crazy, it was the square that was wrong. A solid steel square presumably made by professionals was 89 degrees.

– Eric Lippert
2 days ago





@MichaelKaras: This is good advice, but I would add: check the framing square for squareness! I once spent a frustrating hour trying to figure out why no matter how I tried, the jig I was building would not come out square. I realized eventually that I was not crazy, it was the square that was wrong. A solid steel square presumably made by professionals was 89 degrees.

– Eric Lippert
2 days ago




2




2





Now that you've fixed it, please post an updated picture so we can all sleep at night.

– DavidS
2 days ago





Now that you've fixed it, please post an updated picture so we can all sleep at night.

– DavidS
2 days ago










6 Answers
6






active

oldest

votes


















64














Swap their positions.



Place the bookcases so that they lean into each other instead of away from each other. This will eliminate the gap between the tops.



Bookcase contents are usually quite heavy. Once the cases are filled, you will probably find that you can force the bottoms together and the weight of the contents will distort the shape of the cases so the gap disappears.



If an unsightly gap remains visible then you will need to resort to a decorative molding.






share|improve this answer


















  • 31





    Another benefit to swapping them is you can see if the problem is actually caused by an uneven floor.

    – bitsmack
    Apr 8 at 6:39






  • 1





    It's funny that the best solution (in my opinion) is a quick bodge.

    – Ismael Miguel
    Apr 8 at 18:03






  • 2





    Or flip them upside down, they look like they would go either way

    – Luke McGregor
    2 days ago






  • 1





    @LukeMcGregor even if they go either way, flipping them will either point the opening against the wall or rotate them so that the long diagonal is in the same position it was before. Right now the long diagonals look like this: [][/] Flip them 180 degrees and they look exactly the same.

    – candied_orange
    2 days ago



















38














Thanks everyone; I figured it out and came back here to update my post and noticed that Michael Karas said the same thing I realized (although it was a comment, so I couldn't mark it as the correct answer): I had to pop the back off the left unit (which was actually quite easy because it was just 1/4" plywood attached with brads and no glue), re-rack the unit into square, and then reattach the back. Thanks for the input!






share|improve this answer


















  • 1





    Yes - this is certainly the correct answer. It is not a huge gap and the force required to push the backless bookcase into a cuboid is unlikely to be too great to be held by a few panel pins once you put the back back on. They look like nice bookcases, and good luck!

    – ruffle
    Apr 7 at 23:51







  • 4





    Still, it is often the case in older houses (and sometimes in new ones) that the floor is not flat. You need to level them with a spirit level and some kind of shims so they are perfectly level. Then you could consider screwing them together top and bottom.

    – RedSonja
    Apr 8 at 7:00






  • 1





    So you had frame square or went and bought one?

    – Solar Mike
    Apr 8 at 7:49






  • 1





    I didn't buy a framing square (although it's on my list--I used to have one but it's disappeared). But I used my smallish rafter square on the corner of the left bookcase and it looked out of square. I then made an ad-hoc plumb line and used that to verify that the left bookcase was indeed racked to the left. The right one was square.

    – johnnyb1970
    Apr 8 at 20:52


















35














You don't have to buy or get a framing square : just measure the diagonals... That will tell you if either or both units are out of square.



If they are both ok, then look to the floor - small change in the floor will make a large gap at the top... Then you need some adjustable feet of some sort.






share|improve this answer


















  • 3





    Well, yes they won't. That's my point. Neither for a parallelogram, a trapezoid, ... The diagonals will be equal, like for a square.

    – WoJ
    Apr 8 at 13:24







  • 5





    @WoJ a parallogram does not have equal diagonals, but they do bisect each other... So, the method I suggested is still valid. You may find this helpful : mathplanet.com/education/geometry/quadrilaterals/…

    – Solar Mike
    Apr 8 at 13:31







  • 1





    (a parallelogram having equal length diagonals ... pfff ... the shame ...) :)

    – WoJ
    Apr 8 at 13:37






  • 1





    @WoJ I think we can assume that the top and bottom are the same length, and the left and right sides are the same length, so it is a parallelogram and the trick with the diagonals works.

    – David Richerby
    Apr 8 at 14:55






  • 3





    @WoJ - "a parallelogram having equal length diagonals", yeah, I've heard of them, they are called rectangles.

    – Glen Yates
    Apr 8 at 21:57


















8














I have used interscrews (e.g. from screwfix) in the past to join units together to make them line up nice and tight.






share|improve this answer








New contributor




Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • Thanks--those look like they would be helpful.

    – johnnyb1970
    Apr 8 at 20:54


















5














If the shelves are sturdy, just get some molding and cover the junction of the two units. Nail the molding to only one unit so they can be easily separated if you want to move them.






share|improve this answer






























    0














    I would turn the left bookcase upside down. If the other side of the left bookcase is more square, or slants to the right, this will fix your problem.






    share|improve this answer























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      6 Answers
      6






      active

      oldest

      votes








      6 Answers
      6






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      64














      Swap their positions.



      Place the bookcases so that they lean into each other instead of away from each other. This will eliminate the gap between the tops.



      Bookcase contents are usually quite heavy. Once the cases are filled, you will probably find that you can force the bottoms together and the weight of the contents will distort the shape of the cases so the gap disappears.



      If an unsightly gap remains visible then you will need to resort to a decorative molding.






      share|improve this answer


















      • 31





        Another benefit to swapping them is you can see if the problem is actually caused by an uneven floor.

        – bitsmack
        Apr 8 at 6:39






      • 1





        It's funny that the best solution (in my opinion) is a quick bodge.

        – Ismael Miguel
        Apr 8 at 18:03






      • 2





        Or flip them upside down, they look like they would go either way

        – Luke McGregor
        2 days ago






      • 1





        @LukeMcGregor even if they go either way, flipping them will either point the opening against the wall or rotate them so that the long diagonal is in the same position it was before. Right now the long diagonals look like this: [][/] Flip them 180 degrees and they look exactly the same.

        – candied_orange
        2 days ago
















      64














      Swap their positions.



      Place the bookcases so that they lean into each other instead of away from each other. This will eliminate the gap between the tops.



      Bookcase contents are usually quite heavy. Once the cases are filled, you will probably find that you can force the bottoms together and the weight of the contents will distort the shape of the cases so the gap disappears.



      If an unsightly gap remains visible then you will need to resort to a decorative molding.






      share|improve this answer


















      • 31





        Another benefit to swapping them is you can see if the problem is actually caused by an uneven floor.

        – bitsmack
        Apr 8 at 6:39






      • 1





        It's funny that the best solution (in my opinion) is a quick bodge.

        – Ismael Miguel
        Apr 8 at 18:03






      • 2





        Or flip them upside down, they look like they would go either way

        – Luke McGregor
        2 days ago






      • 1





        @LukeMcGregor even if they go either way, flipping them will either point the opening against the wall or rotate them so that the long diagonal is in the same position it was before. Right now the long diagonals look like this: [][/] Flip them 180 degrees and they look exactly the same.

        – candied_orange
        2 days ago














      64












      64








      64







      Swap their positions.



      Place the bookcases so that they lean into each other instead of away from each other. This will eliminate the gap between the tops.



      Bookcase contents are usually quite heavy. Once the cases are filled, you will probably find that you can force the bottoms together and the weight of the contents will distort the shape of the cases so the gap disappears.



      If an unsightly gap remains visible then you will need to resort to a decorative molding.






      share|improve this answer













      Swap their positions.



      Place the bookcases so that they lean into each other instead of away from each other. This will eliminate the gap between the tops.



      Bookcase contents are usually quite heavy. Once the cases are filled, you will probably find that you can force the bottoms together and the weight of the contents will distort the shape of the cases so the gap disappears.



      If an unsightly gap remains visible then you will need to resort to a decorative molding.







      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Apr 7 at 14:58









      A. I. BreveleriA. I. Breveleri

      7,8771924




      7,8771924







      • 31





        Another benefit to swapping them is you can see if the problem is actually caused by an uneven floor.

        – bitsmack
        Apr 8 at 6:39






      • 1





        It's funny that the best solution (in my opinion) is a quick bodge.

        – Ismael Miguel
        Apr 8 at 18:03






      • 2





        Or flip them upside down, they look like they would go either way

        – Luke McGregor
        2 days ago






      • 1





        @LukeMcGregor even if they go either way, flipping them will either point the opening against the wall or rotate them so that the long diagonal is in the same position it was before. Right now the long diagonals look like this: [][/] Flip them 180 degrees and they look exactly the same.

        – candied_orange
        2 days ago













      • 31





        Another benefit to swapping them is you can see if the problem is actually caused by an uneven floor.

        – bitsmack
        Apr 8 at 6:39






      • 1





        It's funny that the best solution (in my opinion) is a quick bodge.

        – Ismael Miguel
        Apr 8 at 18:03






      • 2





        Or flip them upside down, they look like they would go either way

        – Luke McGregor
        2 days ago






      • 1





        @LukeMcGregor even if they go either way, flipping them will either point the opening against the wall or rotate them so that the long diagonal is in the same position it was before. Right now the long diagonals look like this: [][/] Flip them 180 degrees and they look exactly the same.

        – candied_orange
        2 days ago








      31




      31





      Another benefit to swapping them is you can see if the problem is actually caused by an uneven floor.

      – bitsmack
      Apr 8 at 6:39





      Another benefit to swapping them is you can see if the problem is actually caused by an uneven floor.

      – bitsmack
      Apr 8 at 6:39




      1




      1





      It's funny that the best solution (in my opinion) is a quick bodge.

      – Ismael Miguel
      Apr 8 at 18:03





      It's funny that the best solution (in my opinion) is a quick bodge.

      – Ismael Miguel
      Apr 8 at 18:03




      2




      2





      Or flip them upside down, they look like they would go either way

      – Luke McGregor
      2 days ago





      Or flip them upside down, they look like they would go either way

      – Luke McGregor
      2 days ago




      1




      1





      @LukeMcGregor even if they go either way, flipping them will either point the opening against the wall or rotate them so that the long diagonal is in the same position it was before. Right now the long diagonals look like this: [][/] Flip them 180 degrees and they look exactly the same.

      – candied_orange
      2 days ago






      @LukeMcGregor even if they go either way, flipping them will either point the opening against the wall or rotate them so that the long diagonal is in the same position it was before. Right now the long diagonals look like this: [][/] Flip them 180 degrees and they look exactly the same.

      – candied_orange
      2 days ago














      38














      Thanks everyone; I figured it out and came back here to update my post and noticed that Michael Karas said the same thing I realized (although it was a comment, so I couldn't mark it as the correct answer): I had to pop the back off the left unit (which was actually quite easy because it was just 1/4" plywood attached with brads and no glue), re-rack the unit into square, and then reattach the back. Thanks for the input!






      share|improve this answer


















      • 1





        Yes - this is certainly the correct answer. It is not a huge gap and the force required to push the backless bookcase into a cuboid is unlikely to be too great to be held by a few panel pins once you put the back back on. They look like nice bookcases, and good luck!

        – ruffle
        Apr 7 at 23:51







      • 4





        Still, it is often the case in older houses (and sometimes in new ones) that the floor is not flat. You need to level them with a spirit level and some kind of shims so they are perfectly level. Then you could consider screwing them together top and bottom.

        – RedSonja
        Apr 8 at 7:00






      • 1





        So you had frame square or went and bought one?

        – Solar Mike
        Apr 8 at 7:49






      • 1





        I didn't buy a framing square (although it's on my list--I used to have one but it's disappeared). But I used my smallish rafter square on the corner of the left bookcase and it looked out of square. I then made an ad-hoc plumb line and used that to verify that the left bookcase was indeed racked to the left. The right one was square.

        – johnnyb1970
        Apr 8 at 20:52















      38














      Thanks everyone; I figured it out and came back here to update my post and noticed that Michael Karas said the same thing I realized (although it was a comment, so I couldn't mark it as the correct answer): I had to pop the back off the left unit (which was actually quite easy because it was just 1/4" plywood attached with brads and no glue), re-rack the unit into square, and then reattach the back. Thanks for the input!






      share|improve this answer


















      • 1





        Yes - this is certainly the correct answer. It is not a huge gap and the force required to push the backless bookcase into a cuboid is unlikely to be too great to be held by a few panel pins once you put the back back on. They look like nice bookcases, and good luck!

        – ruffle
        Apr 7 at 23:51







      • 4





        Still, it is often the case in older houses (and sometimes in new ones) that the floor is not flat. You need to level them with a spirit level and some kind of shims so they are perfectly level. Then you could consider screwing them together top and bottom.

        – RedSonja
        Apr 8 at 7:00






      • 1





        So you had frame square or went and bought one?

        – Solar Mike
        Apr 8 at 7:49






      • 1





        I didn't buy a framing square (although it's on my list--I used to have one but it's disappeared). But I used my smallish rafter square on the corner of the left bookcase and it looked out of square. I then made an ad-hoc plumb line and used that to verify that the left bookcase was indeed racked to the left. The right one was square.

        – johnnyb1970
        Apr 8 at 20:52













      38












      38








      38







      Thanks everyone; I figured it out and came back here to update my post and noticed that Michael Karas said the same thing I realized (although it was a comment, so I couldn't mark it as the correct answer): I had to pop the back off the left unit (which was actually quite easy because it was just 1/4" plywood attached with brads and no glue), re-rack the unit into square, and then reattach the back. Thanks for the input!






      share|improve this answer













      Thanks everyone; I figured it out and came back here to update my post and noticed that Michael Karas said the same thing I realized (although it was a comment, so I couldn't mark it as the correct answer): I had to pop the back off the left unit (which was actually quite easy because it was just 1/4" plywood attached with brads and no glue), re-rack the unit into square, and then reattach the back. Thanks for the input!







      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Apr 7 at 15:21









      johnnyb1970johnnyb1970

      613513




      613513







      • 1





        Yes - this is certainly the correct answer. It is not a huge gap and the force required to push the backless bookcase into a cuboid is unlikely to be too great to be held by a few panel pins once you put the back back on. They look like nice bookcases, and good luck!

        – ruffle
        Apr 7 at 23:51







      • 4





        Still, it is often the case in older houses (and sometimes in new ones) that the floor is not flat. You need to level them with a spirit level and some kind of shims so they are perfectly level. Then you could consider screwing them together top and bottom.

        – RedSonja
        Apr 8 at 7:00






      • 1





        So you had frame square or went and bought one?

        – Solar Mike
        Apr 8 at 7:49






      • 1





        I didn't buy a framing square (although it's on my list--I used to have one but it's disappeared). But I used my smallish rafter square on the corner of the left bookcase and it looked out of square. I then made an ad-hoc plumb line and used that to verify that the left bookcase was indeed racked to the left. The right one was square.

        – johnnyb1970
        Apr 8 at 20:52












      • 1





        Yes - this is certainly the correct answer. It is not a huge gap and the force required to push the backless bookcase into a cuboid is unlikely to be too great to be held by a few panel pins once you put the back back on. They look like nice bookcases, and good luck!

        – ruffle
        Apr 7 at 23:51







      • 4





        Still, it is often the case in older houses (and sometimes in new ones) that the floor is not flat. You need to level them with a spirit level and some kind of shims so they are perfectly level. Then you could consider screwing them together top and bottom.

        – RedSonja
        Apr 8 at 7:00






      • 1





        So you had frame square or went and bought one?

        – Solar Mike
        Apr 8 at 7:49






      • 1





        I didn't buy a framing square (although it's on my list--I used to have one but it's disappeared). But I used my smallish rafter square on the corner of the left bookcase and it looked out of square. I then made an ad-hoc plumb line and used that to verify that the left bookcase was indeed racked to the left. The right one was square.

        – johnnyb1970
        Apr 8 at 20:52







      1




      1





      Yes - this is certainly the correct answer. It is not a huge gap and the force required to push the backless bookcase into a cuboid is unlikely to be too great to be held by a few panel pins once you put the back back on. They look like nice bookcases, and good luck!

      – ruffle
      Apr 7 at 23:51






      Yes - this is certainly the correct answer. It is not a huge gap and the force required to push the backless bookcase into a cuboid is unlikely to be too great to be held by a few panel pins once you put the back back on. They look like nice bookcases, and good luck!

      – ruffle
      Apr 7 at 23:51





      4




      4





      Still, it is often the case in older houses (and sometimes in new ones) that the floor is not flat. You need to level them with a spirit level and some kind of shims so they are perfectly level. Then you could consider screwing them together top and bottom.

      – RedSonja
      Apr 8 at 7:00





      Still, it is often the case in older houses (and sometimes in new ones) that the floor is not flat. You need to level them with a spirit level and some kind of shims so they are perfectly level. Then you could consider screwing them together top and bottom.

      – RedSonja
      Apr 8 at 7:00




      1




      1





      So you had frame square or went and bought one?

      – Solar Mike
      Apr 8 at 7:49





      So you had frame square or went and bought one?

      – Solar Mike
      Apr 8 at 7:49




      1




      1





      I didn't buy a framing square (although it's on my list--I used to have one but it's disappeared). But I used my smallish rafter square on the corner of the left bookcase and it looked out of square. I then made an ad-hoc plumb line and used that to verify that the left bookcase was indeed racked to the left. The right one was square.

      – johnnyb1970
      Apr 8 at 20:52





      I didn't buy a framing square (although it's on my list--I used to have one but it's disappeared). But I used my smallish rafter square on the corner of the left bookcase and it looked out of square. I then made an ad-hoc plumb line and used that to verify that the left bookcase was indeed racked to the left. The right one was square.

      – johnnyb1970
      Apr 8 at 20:52











      35














      You don't have to buy or get a framing square : just measure the diagonals... That will tell you if either or both units are out of square.



      If they are both ok, then look to the floor - small change in the floor will make a large gap at the top... Then you need some adjustable feet of some sort.






      share|improve this answer


















      • 3





        Well, yes they won't. That's my point. Neither for a parallelogram, a trapezoid, ... The diagonals will be equal, like for a square.

        – WoJ
        Apr 8 at 13:24







      • 5





        @WoJ a parallogram does not have equal diagonals, but they do bisect each other... So, the method I suggested is still valid. You may find this helpful : mathplanet.com/education/geometry/quadrilaterals/…

        – Solar Mike
        Apr 8 at 13:31







      • 1





        (a parallelogram having equal length diagonals ... pfff ... the shame ...) :)

        – WoJ
        Apr 8 at 13:37






      • 1





        @WoJ I think we can assume that the top and bottom are the same length, and the left and right sides are the same length, so it is a parallelogram and the trick with the diagonals works.

        – David Richerby
        Apr 8 at 14:55






      • 3





        @WoJ - "a parallelogram having equal length diagonals", yeah, I've heard of them, they are called rectangles.

        – Glen Yates
        Apr 8 at 21:57















      35














      You don't have to buy or get a framing square : just measure the diagonals... That will tell you if either or both units are out of square.



      If they are both ok, then look to the floor - small change in the floor will make a large gap at the top... Then you need some adjustable feet of some sort.






      share|improve this answer


















      • 3





        Well, yes they won't. That's my point. Neither for a parallelogram, a trapezoid, ... The diagonals will be equal, like for a square.

        – WoJ
        Apr 8 at 13:24







      • 5





        @WoJ a parallogram does not have equal diagonals, but they do bisect each other... So, the method I suggested is still valid. You may find this helpful : mathplanet.com/education/geometry/quadrilaterals/…

        – Solar Mike
        Apr 8 at 13:31







      • 1





        (a parallelogram having equal length diagonals ... pfff ... the shame ...) :)

        – WoJ
        Apr 8 at 13:37






      • 1





        @WoJ I think we can assume that the top and bottom are the same length, and the left and right sides are the same length, so it is a parallelogram and the trick with the diagonals works.

        – David Richerby
        Apr 8 at 14:55






      • 3





        @WoJ - "a parallelogram having equal length diagonals", yeah, I've heard of them, they are called rectangles.

        – Glen Yates
        Apr 8 at 21:57













      35












      35








      35







      You don't have to buy or get a framing square : just measure the diagonals... That will tell you if either or both units are out of square.



      If they are both ok, then look to the floor - small change in the floor will make a large gap at the top... Then you need some adjustable feet of some sort.






      share|improve this answer













      You don't have to buy or get a framing square : just measure the diagonals... That will tell you if either or both units are out of square.



      If they are both ok, then look to the floor - small change in the floor will make a large gap at the top... Then you need some adjustable feet of some sort.







      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Apr 7 at 14:56









      Solar MikeSolar Mike

      1,13028




      1,13028







      • 3





        Well, yes they won't. That's my point. Neither for a parallelogram, a trapezoid, ... The diagonals will be equal, like for a square.

        – WoJ
        Apr 8 at 13:24







      • 5





        @WoJ a parallogram does not have equal diagonals, but they do bisect each other... So, the method I suggested is still valid. You may find this helpful : mathplanet.com/education/geometry/quadrilaterals/…

        – Solar Mike
        Apr 8 at 13:31







      • 1





        (a parallelogram having equal length diagonals ... pfff ... the shame ...) :)

        – WoJ
        Apr 8 at 13:37






      • 1





        @WoJ I think we can assume that the top and bottom are the same length, and the left and right sides are the same length, so it is a parallelogram and the trick with the diagonals works.

        – David Richerby
        Apr 8 at 14:55






      • 3





        @WoJ - "a parallelogram having equal length diagonals", yeah, I've heard of them, they are called rectangles.

        – Glen Yates
        Apr 8 at 21:57












      • 3





        Well, yes they won't. That's my point. Neither for a parallelogram, a trapezoid, ... The diagonals will be equal, like for a square.

        – WoJ
        Apr 8 at 13:24







      • 5





        @WoJ a parallogram does not have equal diagonals, but they do bisect each other... So, the method I suggested is still valid. You may find this helpful : mathplanet.com/education/geometry/quadrilaterals/…

        – Solar Mike
        Apr 8 at 13:31







      • 1





        (a parallelogram having equal length diagonals ... pfff ... the shame ...) :)

        – WoJ
        Apr 8 at 13:37






      • 1





        @WoJ I think we can assume that the top and bottom are the same length, and the left and right sides are the same length, so it is a parallelogram and the trick with the diagonals works.

        – David Richerby
        Apr 8 at 14:55






      • 3





        @WoJ - "a parallelogram having equal length diagonals", yeah, I've heard of them, they are called rectangles.

        – Glen Yates
        Apr 8 at 21:57







      3




      3





      Well, yes they won't. That's my point. Neither for a parallelogram, a trapezoid, ... The diagonals will be equal, like for a square.

      – WoJ
      Apr 8 at 13:24






      Well, yes they won't. That's my point. Neither for a parallelogram, a trapezoid, ... The diagonals will be equal, like for a square.

      – WoJ
      Apr 8 at 13:24





      5




      5





      @WoJ a parallogram does not have equal diagonals, but they do bisect each other... So, the method I suggested is still valid. You may find this helpful : mathplanet.com/education/geometry/quadrilaterals/…

      – Solar Mike
      Apr 8 at 13:31






      @WoJ a parallogram does not have equal diagonals, but they do bisect each other... So, the method I suggested is still valid. You may find this helpful : mathplanet.com/education/geometry/quadrilaterals/…

      – Solar Mike
      Apr 8 at 13:31





      1




      1





      (a parallelogram having equal length diagonals ... pfff ... the shame ...) :)

      – WoJ
      Apr 8 at 13:37





      (a parallelogram having equal length diagonals ... pfff ... the shame ...) :)

      – WoJ
      Apr 8 at 13:37




      1




      1





      @WoJ I think we can assume that the top and bottom are the same length, and the left and right sides are the same length, so it is a parallelogram and the trick with the diagonals works.

      – David Richerby
      Apr 8 at 14:55





      @WoJ I think we can assume that the top and bottom are the same length, and the left and right sides are the same length, so it is a parallelogram and the trick with the diagonals works.

      – David Richerby
      Apr 8 at 14:55




      3




      3





      @WoJ - "a parallelogram having equal length diagonals", yeah, I've heard of them, they are called rectangles.

      – Glen Yates
      Apr 8 at 21:57





      @WoJ - "a parallelogram having equal length diagonals", yeah, I've heard of them, they are called rectangles.

      – Glen Yates
      Apr 8 at 21:57











      8














      I have used interscrews (e.g. from screwfix) in the past to join units together to make them line up nice and tight.






      share|improve this answer








      New contributor




      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




















      • Thanks--those look like they would be helpful.

        – johnnyb1970
        Apr 8 at 20:54















      8














      I have used interscrews (e.g. from screwfix) in the past to join units together to make them line up nice and tight.






      share|improve this answer








      New contributor




      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




















      • Thanks--those look like they would be helpful.

        – johnnyb1970
        Apr 8 at 20:54













      8












      8








      8







      I have used interscrews (e.g. from screwfix) in the past to join units together to make them line up nice and tight.






      share|improve this answer








      New contributor




      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.










      I have used interscrews (e.g. from screwfix) in the past to join units together to make them line up nice and tight.







      share|improve this answer








      New contributor




      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this answer



      share|improve this answer






      New contributor




      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      answered Apr 8 at 7:31









      DorisDoris

      1812




      1812




      New contributor




      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Doris is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      • Thanks--those look like they would be helpful.

        – johnnyb1970
        Apr 8 at 20:54

















      • Thanks--those look like they would be helpful.

        – johnnyb1970
        Apr 8 at 20:54
















      Thanks--those look like they would be helpful.

      – johnnyb1970
      Apr 8 at 20:54





      Thanks--those look like they would be helpful.

      – johnnyb1970
      Apr 8 at 20:54











      5














      If the shelves are sturdy, just get some molding and cover the junction of the two units. Nail the molding to only one unit so they can be easily separated if you want to move them.






      share|improve this answer



























        5














        If the shelves are sturdy, just get some molding and cover the junction of the two units. Nail the molding to only one unit so they can be easily separated if you want to move them.






        share|improve this answer

























          5












          5








          5







          If the shelves are sturdy, just get some molding and cover the junction of the two units. Nail the molding to only one unit so they can be easily separated if you want to move them.






          share|improve this answer













          If the shelves are sturdy, just get some molding and cover the junction of the two units. Nail the molding to only one unit so they can be easily separated if you want to move them.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Apr 7 at 14:37









          Jim StewartJim Stewart

          11.9k11332




          11.9k11332





















              0














              I would turn the left bookcase upside down. If the other side of the left bookcase is more square, or slants to the right, this will fix your problem.






              share|improve this answer



























                0














                I would turn the left bookcase upside down. If the other side of the left bookcase is more square, or slants to the right, this will fix your problem.






                share|improve this answer

























                  0












                  0








                  0







                  I would turn the left bookcase upside down. If the other side of the left bookcase is more square, or slants to the right, this will fix your problem.






                  share|improve this answer













                  I would turn the left bookcase upside down. If the other side of the left bookcase is more square, or slants to the right, this will fix your problem.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered yesterday









                  spacetyperspacetyper

                  14318




                  14318



























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