Standard House Roof Slope

When it comes to residential construction your roof is a visible part of the structure.

Standard house roof slope.

Most economical when the difference in slope between the top and bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch. Steeper slopes are ideal for areas that have higher snow loads and will also prevent the possibility of ponding water on the roof. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof.

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. Roof pitch refers to the slope which the rafter creates. Choosing a low pitched roof a low pitch roof has less area and is therefore cheaper to construct. A common range is given from 1 12 to 4 12 whereas conventional dimensions vary from 4 12 to 9 12 but the steep roofing technique follows slope above 9 12 with additional fasteners.

A steep slope roof is one whose slope is greater than 3 12. Pitches above 9 12 are very highly angled and are designated steep slope roofs. 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. Roof pitches can be as high as 12 12 according to the mhimperialhome website.

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the span in inches. The most commonly used roof pitches fall in a range between 4 12 and 9 12. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.