Determining slope/angle of roof joist inside attic

Discussion in 'Framing and Foundation' started by swindmill, May 5, 2010.

  1. May 5, 2010 #1

    swindmill

    swindmill

    swindmill

    Well-Known Member

    Joined:
    Jan 22, 2010
    Messages:
    214
    Likes Received:
    14
    This is a very elementary question, but rather than walk around Lowe's looking at tools, I figured I'd come here: What's the easiest way to determine the slope of the ceiling/roof joists in my attic? I'm building a knee wall and the top plate will be attached to the joists, so the studs will need to be cut at the angle of the ceiling. I assume there's a simple tool for this?
     
    Last edited: May 5, 2010
  2. May 5, 2010 #2

    Wuzzat?

    Wuzzat?

    Wuzzat?

    Well-Known Member Sponsor

    Joined:
    Jan 20, 2010
    Messages:
    2,471
    Likes Received:
    175
    If Rise over Run is 3 over 10, the angle is the arctan of 0.3; 16.7 degrees.
    The angles have to add to 180 so one angle is 90 and the other must be 90-16.7.
     
  3. May 5, 2010 #3

    inspectorD

    inspectorD

    inspectorD

    Housebroken Staff Member Admin Moderator

    Joined:
    Dec 17, 2005
    Messages:
    4,502
    Likes Received:
    267
    Its called a level and a block of wood....trace the angle on the wood when it is perpendicular to the angle you need.
     
  4. May 5, 2010 #4

    swindmill

    swindmill

    swindmill

    Well-Known Member

    Joined:
    Jan 22, 2010
    Messages:
    214
    Likes Received:
    14
    Good call. Thank you.
     
  5. May 5, 2010 #5

    CraigFL

    CraigFL

    CraigFL

    Well-Known Member

    Joined:
    Mar 13, 2006
    Messages:
    409
    Likes Received:
    0

Share This Page