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Need some help on a carpentry project.

Discussion in 'Garage / Workshop' started by hendooman, Jun 14, 2011.

  1. Jun 14, 2011 at 9:16 AM
    #1
    hendooman

    hendooman [OP] The Stroker Ace

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    I am building a shed in my backyard and I have gotten to a point where I am struggling to get the right angle on my rafters. I am building a simple gable roof with a 8" overhang with a standard plumb cut. The shed is 96" wide outside edge to outside edge. I want a 5/12 pitch on the roof and will be using a standard 2 x 6 as the ridge beam.

    I am struggling with the birdsmouth cuts and the ridge rise. The depth and dimensions throws me all off. I am going to use 2 x 4's as rafters since it is just a shed and will be plenty strong for my needs. Does anyone have a program or the knowledge to fill in the blanks on these dimensions.

    Let me know if I am missing any needed measurements. Thanks and hope someone can help.

    [​IMG]
     
  2. Jun 14, 2011 at 9:19 AM
    #2
    hendooman

    hendooman [OP] The Stroker Ace

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    Shed so far...

    [​IMG]
     
  3. Jun 14, 2011 at 9:21 AM
    #3
    scocar

    scocar Scouting the perimeter for weakness

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    Back to square one after the 2001. So...
    Check with OZ-T. He is a carpentry ninja.

    Alternatively, it as all geometry calculations for triangles. If you know the height and width (the L part of the triangle), you can determine the length of the hypotenuse (the longest side(s) fotht triangle, your rafter length). Google geometry (or carpentry) calculators, and you should be off and running. Once you have all three sides, you can calculate all angles.

    To determine roof pitch, you can look up recommended pitches and work from there, too.
     
  4. Jun 14, 2011 at 9:28 AM
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    hendooman

    hendooman [OP] The Stroker Ace

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    I thought about simulating the the ridge beam. I can get that done. But is there a trick to getting the birdsmouth right? I can always trial and error. If I dont have exact dims by this weekend I will do that method. Just thinking I could get dims, and cut all the rafters at once and knock it out real quick.

    OZ-T where are you???
     
  5. Jun 14, 2011 at 9:31 AM
    #5
    97yota4wd

    97yota4wd Well-Known Member

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  6. Jun 14, 2011 at 9:31 AM
    #6
    xJuice

    xJuice My spoon is too Big!

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  7. Jun 14, 2011 at 9:34 AM
    #7
    hendooman

    hendooman [OP] The Stroker Ace

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    I think that gets me close...would the angle of the heel cut be the same as the end plumb cut?

    Here's what I got from that site:
    Overall Rafter Length: 4 ft 11 7/8"
    Ridge to Wall Length: 4 ft 3 3/16" (would this be the dims from the peak to the birdsmouth?)
     
  8. Jun 14, 2011 at 10:20 AM
    #8
    xJuice

    xJuice My spoon is too Big!

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    [​IMG]

    Someone feel free to correct me if I pooched the screw...

    p.s. Generally you make the seat cut of the birdsmouth as wide as the member it's sitting on, but the 3-1/2" here cuts into the rafter quite a bit so I cut it to 3" in my example. If you make the seat cut 3-1/2" the heel cut becomes 1-7/16" instead of 1-1/4".
     
  9. Jun 14, 2011 at 10:33 AM
    #9
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    What is the width of your exterior wall framing ? 2x4 or 2x6 ?
     
  10. Jun 14, 2011 at 10:56 AM
    #10
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    I'll assume you framed your exterior walls with 2x4 .

    Layout a 22.5 degree plumb cut at the top and cut it .

    Hook your tape onto the long point of the angle and measure down the top of the rafter 51 1/8 , draw another plumb line the same as the one on the top , this represents the exterior wall line .

    Continue measuring down the top of the rafter and make another plumb line at 59 3/4 , this is the total length of rafter including the 8" overhang .

    To cut the birdsmouth , draw a line square to your plumb line you marked representing the exterior wall , the level leg of the birdsmouth should be 3 1/2" . Do not over cut .

    I'll post a pic , hang on
     
  11. Jun 14, 2011 at 10:56 AM
    #11
    hendooman

    hendooman [OP] The Stroker Ace

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    96" outside width with 2x4's.

    Thanks
     
  12. Jun 14, 2011 at 11:06 AM
    #12
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    [​IMG]

    I'll check in here if you have some more questions

    Are you putting plywood on the frame ?
     
  13. Jun 14, 2011 at 11:13 AM
    #13
    97yota4wd

    97yota4wd Well-Known Member

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    this shit is so confusing...

    *trying to learn for future referance..*
     
  14. Jun 14, 2011 at 11:14 AM
    #14
    Toyotacrawler

    Toyotacrawler She's got the jimmy legs

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    X2, :popcorn: Learn something new everyday!
     
  15. Jun 14, 2011 at 11:15 AM
    #15
    hendooman

    hendooman [OP] The Stroker Ace

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    You guys are a huge help. I am going to decipher all this info tonight after work and draw up some lines on a 2 x 4. I will shout back if I get stuck. Thanks again. This is a huge help.
     
  16. Jun 14, 2011 at 11:16 AM
    #16
    hendooman

    hendooman [OP] The Stroker Ace

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    Yes plywood for the roof, tar paper then regular asphalt shingles.
     
  17. Jun 14, 2011 at 11:17 AM
    #17
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    I meant the walls .
     
  18. Jun 14, 2011 at 11:18 AM
    #18
    hendooman

    hendooman [OP] The Stroker Ace

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    I will use some cheap 4 x 8 siding more than likely...Menards usually has it for $15 a sheet or so. I am going to paint it the color of my house so I want it to be pretty decent stuff.
     
  19. Jun 14, 2011 at 11:22 AM
    #19
    97yota4wd

    97yota4wd Well-Known Member

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    yeah some pretty useful info here
     
  20. Jun 14, 2011 at 11:26 AM
    #20
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    You may want to over size the birdsmouth by the siding sheeting + a hair so that you don't need to notch around all the rafter tails .

    I can explain this if needed , but won't confuse the issue if you don't want to do that .
     
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