Pitch And Elevation Of Roof

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

Pitch and elevation of roof.

Common rafter elevation if you are calculating rafter length from the center of the ridge beam as shown below you will need to subtract half of the thickness of the ridge beam from the top end of the rafter. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. A roof similar to a mansard but sloped in one direction rather than both. Understanding a roof s pitching can be quite tough if you are just getting started and working with a roofer can leave you a little bit unsure about what is being suggested with regard to the job there s so much to learn that it can become a bit baffling.

Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. Conventional roofs are the easiest to construct and you can walk on them safely. You can also calculate roof pitch even without using a roof slope calculator. So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally.

The most commonly used roof pitches fall in a range between 4 12 and 9 12. Squaring building lines example 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. The pitch fraction represents a certain amount of vertical rise over the entire span. Pitches above 9 12 are very highly angled and are designated steep slope roofs.

For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4. If the rise is 4 feet over a 24 foot span then the roof pitch was said to be 1 to 6 the pitch can be expressed numerically as a fraction. An element of the second empire architectural style mansard style in the u s. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe.

One of the most important aspects of trying to get the roof right though is the pitch. A roof with the pitch divided into a shallow slope above a steeper slope. A roof that rises 8 feet over a 24 foot span was said to have a 1 to 3 pitch. The steep slope may be curved.