How to calculate the height of the roof of the house -
The roof is the first protective barrier at home that prevents cold air, thawed rain or rain from entering the living space. If you correctly calculate, and then correctly determine the height of the roof ridge, it will independently discharge atmospheric moisture and snow mass from the surface of the slope, avoiding an increase in load on the roof system. In this article we will describe how simple it is to calculate the height of the roof of the house, as well as how this parameter affects the quality of the roof structure.
Definition and functions
In order for the appearance of the roof to be harmonious and organically complement the architectural design of the house, it is necessary to correctly calculate the ratio of the width and length of the building. According to construction terminology, the height of the ridge is the distance from the middle of the base of the roof to its highest point. The following design qualities depend on this parameter:
- The angle of slope of the roof. The higher the ridge, the steeper the slope of the roof should be. On the territory of central Russia, which is famous for a large amount of winter precipitation and prolonged rainfall in the fall, it is recommended to choose the slope of slopes in the range of 20-50 degrees.
- Square skates. The higher the roof, the greater the area of the ramps, thereby increasing the cost of roofing, as well as the material for the manufacture of the truss frame.
- Carrying capacity of the frame. With an increase in the height of the roof, the weight increases, and, consequently, the load from the roofing pie, due to which it is necessary to strengthen the frame of the structure with additional elements.
Important! There are 2 methods for calculating the height of the roof: you can calculate this parameter based on the size of the desired slope, or, on the contrary, determine the height of the roof, and then calculate what you need to do to make the angle of the slopes.
Factors Affecting Choice
The height of the roof of the house has a significant impact on the technical characteristics, performance characteristics of the structure. If you correctly calculate, and then make the project of the roof that meets the climatic conditions, the nature of the use of the structure, then it will last longer, will need less care and maintenance. When designing the roof of the house take into account the following factors:
- Precipitations The more the average annual rainfall in the construction region, the greater the higher should be the ridge.
- The strength and direction of the wind. In windy regions, it is recommended to build low-rise buildings with a low, sloping roof, so that it does not break from the rapid gusts of air.
- The nature of the use of the premises. If the project of the house provides for the construction of a residential attic, then the height of the ridge should be at least 2.5 m.
Note! The height and slope of the roof are calculated before the drafting of the project, since these indicators have a strong influence on the roof frame design and the choice of roofing.
Calculation procedure
It is easy to calculate the height of the roof, even if you do not have a special calculator program at hand. The basis of the calculations is that the vertical section of the roof is an isosceles triangle, the base of which corresponds to the width of the gable. Knowing the geometric formulas, we can find the height of the ridge using the calculation formula for the triangle:
- First we need to measure the width of the structure, and then divide this value by 2.
- Then you need to determine the slope of the slope, that is, to calculate the angle between the base of the roof and the surface of the slope.
- By the next action, we determine the tangent of the angle formed by the base of the roof and the slope using the Bradis table or using an engineering calculator.
- Then we multiply half the width of the overlapped structure by the tangent of the angle between the slope and the base of the roof, obtaining the height of the ridge.
Experienced craftsmen recommend choosing the height of the ridge so that the slope of the roof is in the range of 25-45 degrees. With these values, the design has an optimal ratio of price and drainage efficiency.
