The construction of a roof with a slope( or slope) is more complicated than flat. However, such roofs are most common because they are much easier to maintain. But before you start building, you should first of all understand how to calculate the roof slope and other parameters, and what such calculations depend on.
After all, the roof experiences certain environmental influences, and for correct calculations it is necessary to take into account all possible loads on the future roof, depending on the climatic conditions of the region.
Things to consider when calculating
Direction and speed of prevailing winds
The steeper the slope, the greater the wind load this part of the roof will experience. However, it should be understood that the smaller the angle of the ramp, the greater the likelihood that the cover sheets will begin to rise by the force of the wind, and eventually the roof will be on the ground.
Intensity of precipitation
Practice shows that roofs with a slope angle of 30 degrees experience the maximum load of snow on the roof. However, at angles of 45 degrees or more, snow itself comes off the roof almost entirely. At small corners in rainy weather, the wind will "try" to drive water under the joints of sheets( parts) of the roof.
Minimum angle( in degrees):
for slate - 30;
for tiles - 15;
for roofing felt and other roll materials - 5.
General recommendations of the
- for areas with dry climate are better suited for more gently sloping roofs. Such roofs are appropriate if strong winds are frequent in the region;
- if in winter there are heavy snowfalls, then the roof should be made steeper. But this is if the prevailing winds are not too strong. At a normal level of winds, a sufficient angle of 35-40 degrees;
- if strong wind prevails, then the angle should be reduced to 15 - 20 degrees;
- it should be borne in mind that as the angle of inclination increases, so does the roof area. Consequently, the consumption of material, and hence the cost of construction, increases;
- at large angles of roof incline is not recommended use of roll materials, as there is a possibility of their sliding. The maximum allowable angle for them is 25 degrees.
When calculating the roof, it is necessary to be guided by the expediency of using this or that design, as well as the material. You can always make the most acceptable decision.
