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

05-05-2010, 08:45 AM
swindmill
Senior Member

Join Date: Jan 2010
Posts: 167
Liked 12 Times on 11 Posts
Likes Given: 1

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?
Banned

Join Date: Jan 2010
Posts: 2,328
Liked 167 Times on 154 Posts
Likes Given: 94

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
Housebroken

Join Date: Dec 2005
Location: Litchfield, CT
Posts: 4,034
Liked 119 Times on 99 Posts
Likes Given: 265

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.

__________________

Just My

05-05-2010, 01:25 PM
swindmill
Senior Member

Join Date: Jan 2010
Posts: 167
Liked 12 Times on 11 Posts
Likes Given: 1

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
Senior Member

Join Date: Mar 2006
Posts: 409

__________________