DIY Home Improvement, Remodeling & Repair Forum > Determining slope/angle of roof joist inside attic

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05-05-2010, 08:45 AM
swindmill
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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?

Last edited by swindmill; 05-05-2010 at 10:21 AM.

05-05-2010, 10:18 AM
Wuzzat?
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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.

05-05-2010, 01:20 PM
inspectorD
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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.
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05-05-2010, 01:25 PM
swindmill
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Quote:
 Originally Posted by inspectorD 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.

05-05-2010, 01:28 PM
CraigFL
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I use one of these:

http://www.sears.com/shc/s/p_10153_1...6&blockType=G6