Understanding your roof parts

Roof terms are a little bit complicated, and here you can check if you are familiar with them.

The pitch of a roof is the vertical rise divided by the total span. The slope is the vertical rise divided by the horizontal run (a run corresponds to half of the spam). Imagine that a building has a roof peak located 8 feet above the top plate. The building width is 24 feet (total span, in roof words). So, the pitch is 1/3 (or 4 in 12 – normally the plans shows multiples of 12). The run is half of the span (in that case 12), so the slope is 8/12 (or 8 inches of rise per 12 inches of run)

Framing a Gable Roof
Diagram from the website https://www.mycarpentry.com

The pitch defines the angle of the roof in degrees – a 12″ in 12″, for example, corresponds to a rood with an angle of 45 degrees in the lateral side (an eave, in the rood language). It is very important to understand this concept to work together with your framing team to define the loads of your roof, mainly in our area, where snow times during winter can be tough. The main areas of your house will need pitches of at least 8″ or 10″ in 12″. Deck ceilings can have less pitch in the roof design 2″to 4″in 12″).

roof pitch expressed in degrees
Photo credit: https://www.roofingcalc.com

To understand the other names associated with your roof area, check the photos from the website https://www.mycarpentry.com. They also have a calculator to facilitate the roof analysis during your building process.

 

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