Soffit Follows Roof Pitch

A vaulted ceiling follows the roof pitch with finishing materials applied to the rafters.

Soffit follows roof pitch.

Rafter roof rafters are one of the most important parts of any type of roof. Another by product of this roof configuration is varying soffit heights and widths which require further design decisions. Up to 6 12 roof pitch use the standard formula as explained in this article. In this article we stick to the basics which follows this logic.

Of course there should be intake vents to ensure a balanced system. To ensure proper ventilation calculate the correct number of soffit vents for your home. You measure this as a rise and run equation such as 6 12 where the rake angle rises six units in 12 units of run. For projects involving vents with motors the calculation formula is different.

One method is to use a powered attic vent with a humidistat thermostat located close to the ridge or top of the roof. They are generally made of two by four lumber and are used to form the pitch of a roof. Rake boards follow or parallel your roof pitch. 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.

That first number is what changes but stays within a range. This ceiling can make a porch feel larger add drama to the space and keep your porch cool in hotter climates. To maintain a consistant ridge height in these situations the roof pitch must be adjusted. 2 12 pitch or lower low slope or nearly flat.

Rakes are always miter joined at the ridge of your roof. When a pitch value is shown it will appear as 2 12 which would indicate a nearly flat roof or 18 12 very steep. And in many of these cases the hip roof forms a large volumetric attic space to ventilate. The calculated soffit drop is the measurement from top of wall vertically down to the underside of soffit sheeting.

Where roofs of unequal pitch join it requires careful layout to create equalwidth soffits with equal height fascias. The wall top to rafter bottom measurement is from top of wall vertically down to a point level with the bottom outside edge of the rafter not including fascia. 11 12 roof pitch and higher increase the amount of ventilation by 30 percent. Here s a rule of thumb to follow.

Figure 7 mechanical ventilation used with a hip roof. There s no correct way to finish rake lower edges. They come from each side of the roof and meet in the middle to form what looks like a v. The most common parameter is to maintain an equal ridge height over building sections with differing spans.

For example six inches up for every 12 inches across.