Inspiration for a timeless carpeted family room remodel in Houston with beige walls, a standard fireplace and a wall-mounted tv

Traditional Family Room

Traditional Family Room, Houston

Inspiration for a timeless carpeted family room remodel in Houston with beige walls, a standard fireplace and a wall-mounted tv - Houzz

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jaime1013 wrote:July 16, 2012
  • PRO
    K.O.H. Construction Corporation
    8 years ago
    last modified: 8 years ago
    I had a few minutes, I you really want to confuse him, show this formula to him.
    There are two different methods below. One shows you how to do it with a calculator and the other is an Excel spreadsheet set up with different worksheet tabs for different crown angles. It is all done with formulas and typical stuff is covered to save the time of having to use a calculator. You can also input your own values and it will calculate for you. I will get more into that at the end of this. Here is how I do it on the jobsite with a scientific calculator that you can by for 10-12 bucks at your local drug store or radio shack. To do this, I use a clear plastic protractor and a slide bevel. Before I buy the protractor, I always bring the slide bevel into the store and set the protractor on top of it and adjust the angle to 90 while splitting the hole at the bottom, and then flip it over. It should be exactly the same. The cheap plastic protectors can be off, so be careful. I will then also check at 45, splitting the hole at the bottom and then flipping it again to make sure it is equal on both sides.
    Once at the jobsite, I use two pieces of wood about 12" long that are nice and flat and push them into the corner and then push the slide bevel into the corner and get a snug fit. I then put the protractor on the slide bevel and split the hole at the bottom and read the degrees. I divide the number I read by 2 and use in the formula below. I also need to get the angle of the crown. This is not what most people think it is, as they use the formulas on the saws. They vary quite a bit. I stick the crown in a framer's square and mark on the square the top and bottom of the crown. I then take the slide bevel and place it on the square and adjust it so it aligns with the markings and then read the angle with the protractor. At this point I have the permanent and true angle of the crown.

    M = Miter angle of saw

    B = Bevel angle of saw

    T-1 = Inverse tangent. Read your calculator's instructions to figure out how to get this calculation. It is frequently two key presses in a row - inverse and then tangent or function2 and then tangent.

    W = Wall angle. This is what the protractor says divided by 2.

    C = Crown angle. This is the angle it sits off the wall. Generally it will be between 36 and 57 degrees.

    M = (TAN-1(TAN*W)(SIN*C))

    B = (TAN-1(SIN*M/TAN*W)

    It is actually much easier than it looks and you do not need to understand the math. You do it like this in your calculator:

    1. Get your C value and write it down
    2. Get your W value and write it down
    3. Input the W value
    4. Press TAN
    5. Press the memory save button
    6. Press clear
    7. Input the C value
    8. Press SIN
    9. Press X (times)
    10. Press the memory recall button
    11. Press =
    12. Press the inverse button
    13. Press the TAN
    14. This is your miter angle. Write it down rounded to 1/10th of a degree (if it was 38.34567, you would write down 38.3).

    15. Press clear
    16. Input the W value
    17. Press TAN
    18. Press the memory save button
    19. Press clear
    20. Input the M value you just wrote down
    21. Press SIN
    22. Press / (divide)
    23. Press the memory recall button
    24. Press =
    25. Press the inverse button
    26. Press the TAN
    27. This is your miter angle. Write it down rounded to 1/10th of a degree (if it was 18.74587, you would write down 18.7).

    You now have your miter and bevel angles for your saw. This works just fine for vaulted ceilings and the whole process is very fast. It is not nearly as time-consuming as it appears here. With paint grade crown, you can measure your angle to ½ degree and for stain grade, you should work to ¼ degree and they will be exact and tight.

    If your saw is not perfect, you may have to introduce a fudge factor. Typically it is something to do with the bevel angle. If it does not come out perfect, adjust your bevel angle in 1/4" degree increments until it is correct. Once you get it, let’s say your saw bevel is off 1 full degree, then just add or subtract that 1-degree all the time when you set the saw.

    The link to the spreadsheet below is for quick reference. The formulas are put in differently to accommodate the difference between Excel and a calculator.

    Each tab has two crown angles. The first one is 36-37. On this tab you will see one column on the left and one on the right. All the typical cuts for 36-degree crown are on the left and the typical cuts for 37-degree crown are on the right. Each crown angle is broken up into 3 sections. 90-degree corners, 22 ½-degree clips and 30-degree clips. The highlighted area in each one is the full typical perfect angle input number to put in your saw (where the angle of the wall is a true 90 or 45 or 30. Each section is broken down into different settings at ¼ degree increments and the list goes up and down a full 2 degrees in each direction.

    You can print it out and take it to the jobsite. If you know the angle of your crown (let’s say it is 51 degrees and the wall angle is 88 degrees), you would go to the tab with 51 on it (you will be using this sheet again and again now for more cuts) and then look for 88 degrees. It is on the top right.

    Then get your saw settings:
    Crown angle - Wall angle - Miter - Bevel
    51 - 88 - 38.83 - 29.85

    You can always just type in a wall angle number in the spreadsheet and it will calculate it for you, if the angle you need is not already there.

    The way you deal with this for vaulted ceilings will become apparent as you do it with a calculator.
  • elklaker
    8 years ago
    Corner blocks (sold anywhere crown is sold) make the job a lot easier. We did it in our living room and they look great. Remember-caulk is your best friend!
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