Joining Unequal Roof Heights

The rise or height of the roof at its peak is the altitude of the triangle.

Joining unequal roof heights.

Unequal pitch roof trigonometry calculating unequal pitched roofs is easy if you know what trigonometry functions to use. 5 8 whence a 7 c 9 60. 88 a in terms of the run of the common rafter over b. Joining two roofs of different pitches.

Major rafter pitch or major pitch angle minor rafter pitch or minor pitch angle ridge width. I have this roof issue where the front of the roof is a hip that is about 8 higher than the main part. That roof was originally built with flush rakes so we extended the rake overhangs on both sides to 24 inches putting the shed roof rake trim in plane with the fascia of the porch we were. Minor roof rise 5 run 6 5 12 pitch.

Would be easy if i could join the two roofs but because of the overall width of the house this part of the roof peaks higher than the main part of the roof so i cannot simply join them. Joining roofs higher roof to lower roof hi could somebody give me some advice on joining roofs please. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. Drawing a superimposes the common rafters for the two roof pitches and illustrates the problem that occurs when roof layout starts at the outside edge of the exterior walls.

Where roofs of unequal pitch join it requires careful layout to create equalwidth soffits with equal height fascias. Plan of uneven pitches. I m trying to join two roofs together by extending onto the other unfortunately the one to be extended is higher than the other roof see attached image. 1 find the run of valley rafter over c fig.

C2 a2 b2 7 2 62 a. The formulas below use the law of sines to calculate the unknown. Position the flashing between the two roof pitches. Unequal pitch roof intersections have always been head scratchers.

Main roof rise 8 run 12 pitch. Slide the right edge of the flashing under the highest roof pitch. John carroll takes the mystery out of it. The run or half the building span is the base of the triangle.