How To Frame A Roof With A 12 12 Pitch

The minimum roof pitch is 1 8 inch rise per foot of span.

How to frame a roof with a 12 12 pitch. This will the first point of the rafter measurement line. Whatever your choice make sure to take the regional climate into consideration. Simply adjust the square to the desired pitch and lock in place with the knurled knob. Measure down y height from the long point of the rafter cut and make a mark.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Input the pitch of the roof that you calculated above we ll use 7 12 for reference throughout on the framing square. The best pitch for shingles is between 4 12 and 12 12. From one end of the rafter material using a speed square or framing square mark an x in 12 angle on the rafter and cut it.

You can then use the square to transfer the angle for the cut to the lumber. Lay a framing square flat on the board near one end so that the horizontal blade aligns with the bottom edge of the board at 12 inches and the vertical blade is aligned at the roof pitch. On the body of the square the longer side input the 12 and input the 7 on the tongue the shorter side of the square by lining up the stair gauges at the corresponding point on the square. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.

For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17. For example you may want a steep pitched roof or perhaps a flat one. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. Roof framing rafter layout.

The pivot square can be set to any whole number pitch from 1 12 to 12 12. Outside of the u s a degree angle is typically used. But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons. Trace the lines for the plumb cut and the level cut for the eave from the vertical and horizontal edges of the framing square.

Asphalt or composite shingles need at least a 2 12 pitch steel roofing needs a 3 12 pitch or higher and rolled roofing needs a 2 12 pitch or more. It is often compared to slope but is not exactly the same.