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-   -   Determining slope/angle of roof joist inside attic (http://www.houserepairtalk.com/f32/determining-slope-angle-roof-joist-inside-attic-9175/)

swindmill 05-05-2010 08:45 AM

Determining slope/angle of roof joist inside attic
 
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?

Wuzzat? 05-05-2010 10:18 AM

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.

inspectorD 05-05-2010 01:20 PM

yup
 
Its called a level and a block of wood....trace the angle on the wood when it is perpendicular to the angle you need.

swindmill 05-05-2010 01:25 PM

Quote:

Originally Posted by inspectorD (Post 44498)
Its called a level and a block of wood....trace the angle on the wood when it is perpendicular to the angle you need.

Good call. Thank you.

CraigFL 05-05-2010 01:28 PM

I use one of these:

http://www.sears.com/shc/s/p_10153_12605_00939840000P?vName=Tools&keyword=ang le+indicator&prdNo=6&blockNo=6&blockType=G6


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