Framing Angled Attic

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

Framing angled attic. The polygon roof miter angle is the tangent of the polygon central angle divided by two. Begin with a baseline and snap a center line perpendicular to it. The easiest method of framing a wall is to build it on the floor and erect it ensuring it s plumb straight up and down before securing. Collar ties are horizontal members that like rafter ties extend from rafter to rafter but.

The run or half the building span is the base of the triangle. The rise or height of the roof at its peak is the altitude of the triangle. And the line length measurement from the roof peak to the building wall is the hypotenuse. However the wall must be built 1 4 inch shorter than.

The central angle for an octagon roof is 45. Use screws to attach sheets of birch plywood to the angled ceiling over the insulation making sure to drive the screws into the ceiling joists. If you want your attic space to have a flat ceiling you ll need to add collar ties to the framing. Eliminate guesswork make a full size drawing of the gable wall on the floor of your garage or attic.

One half of 45 is 22 5. Then add the 2 4 side walls and the roof slope using a square. Run the plywood down to the top of the knee wall.