The ridge board has the top of the common rafters nailed to it, these rafters slope in a downwards direction where they are nailed to the ceiling joists and the outside walls. A ridge board runs along with the highest point or peak of the roof and is parallel to the outside walls. In gable roof design, the pitch and the height of the gutters can vary depending on the size of the property.and the slope angles are still the same, then. When the angle of the walls is less or more than 45 deg. When two roof surfaces sit on two walls that are at right angles to each other, and they are both sloping at the same angle they join at a regular hip of valley, and show up in a plan view as being 45 deg. Wood core roll is used for joining bays of lead roofing, also on steeply pitched roofs and lead cladding where a bold joint appearance is preferred. WOOD CORE ROLL as used on ridges, hips and flat roofing Wood core roll is to be used to allow for the expansion and contraction in lead sheet and flashing.I chose this design because one of the gables was so wide due to the original structure and I wanted the hip ridge to be above the gable ridges. I am adding a second story addition and I created a roof design with a hip roof that has a 10:12 pitch with 2 reverse gables that have 6:12 pitches.
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