18 Degree Roof Pitch

Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15.

18 degree roof pitch. 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. Locate its tangent or tan and follow the left row for you to read its corresponding degree. It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. So use the 12 inch level as a constant run and 18 inch ruler as a variable rise.

Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are. If you are looking at a roof plan for your home or business very rarely will it list the roof pitch in degrees instead it lists the rise and the run of the roof. The 12 inch run is considered standard in roof pitch or angle terminologies. For example a 7 12 roof pitch means that for ever 12 of horizontal distance the.

18 43 5 12 22 62 6 12 26 57 7 12 30 26 8 12 33 69 9 12 36 87 10 12 39 81 11 12 42 51 12 12 45 this is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations. 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. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.

Main methods of calculating roof pitch calculation of the slope of the roof is an important part of the design process of its construction. Common roof pitches and equivalent grade degree and radian angles most roof s have a pitch in the 4 12 to 9 12 range. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. In most cases the angle of inclination is chosen in the range from 11 to 45 but other values are encountered.

A 4 12 slope is enough to accommodate water runoff but is not suitable for regions that are affected by heavy snowfall. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope flat.