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Low pitched roofs have the pitch below 4:12 (33.3%).Generally, these roofs have a pitch from 1/2:12 to 2:12 (from 4.2% to 16.7%).

Flat roofs are not perfectly flat in reality – they need a small slope for water runoff.We can divide roofs into the following categories: For example, a pitch of 1:12 means that for every twelve yards of building length, the rise will be equal to one yard. Roof pitch is often expressed as a ratio between rise and run in the form of x:12. It can be assessed in two ways – either as the angle the rafter makes with the horizontal or the proportion between the rise and the run of the roof. Substituting the values of 3 meters and 4 meters with the values taken at the site and the result of the length of the slope (used as the diagonal), will allow you to correctly draw a right angle.Roof pitch is simply the slope created by the rafter. Unfortunately, it is not always possible to use such measurements. Usually the values used are: 3 meters, 4 meters and 5 meters to obtain a right angle. You can also use this measurement to calculate the diagonal in order to draw a right angle, a technique widely used in the construction industry. The length of the slope corresponds to the diagonal of a right-angle triangle. If the path is winds, the distance traveled will be greater than the length of the slope. It is quite possible to calculate the average inclination of a path using the values given by the horizontal distance (run) and elevation (rise) reached at the end of the incline. Average Inclination and Elevation of a Path It can be reduced to 1.20 m if one side is not attached to a wall. The ramp's width must be at least 1.40 m. The gradient of the width, also known as the cross slope, should preferably be zero and should never exceed 2%. It can be reduced to 1.20 m if there is no wall on one side or the other. The gradient of the width, known as the cross slope, should preferably be zero, and in all cases less than 2%. Landings must be put in installed every 10 m maximum and have a minimum length of 1.40 m. between 4% and 5% for a maximum length of 10 m.maximum 12% for a length of less than 50 cm.The slopes for a ramp for disabled access should be: The distance along this slope would be 141.4 meters. For example: a mountain path with a 100% gradient would rise 100 meters for every 100 meters it goes forward. It should be noted that a slope of 100% is not vertical, but it is equivalent to having an identical height and width, which results in a 45° angle of inclination. So: Square root ((width x width) + (height x height)) = Slope length An inclination of 100% This theorem is done by multiplying the square's square root by the sum of the squared width and the squared height. The length of a slope is calculated using the Pythagorean Theorem. * Hypotenuse: A wholly barbarian term which means the "length of the third side" or "slope length".