# How to calculate the truss system

Instruction

Most often the truss system is made of coniferous trees such as pine, cedar, spruce or larch, the humidity of which is not more than 20%. In view of the fact that the roof structure can take on any precipitation, including aggressive, the tree from which the roof system is made is additionally treated with hydrophobic, antiseptic compounds and fireproof impregnations. Thus, when calculating a truss system, everything should be taken into account, even small things, as it seems at first glance. So you should include your own weight of the roof, weather, seasonal loads such as snow, wind, rain, possible spontaneous effects, etc.

Snow load is made using calculations using the formula S = Sg * m. At the same time, Sg is the weight of snow per 1 square meter, and m is the coefficient of snow load on the rafter

**the system**. The calculation is made in accordance with the map of regions. So, for Ukraine, for example, Sg is equal to 120, for Russia - 180.In turn, m completely depends on the chosen roof parameter, namely on the very angle of inclination. So, for example, having a slope angle less than 25 degrees, m will be 1, if you slope from 25 to 60 degrees - 0.7, and if the angle is more than 60 degrees, m will be zero, and this unit will not be taken into account in calculations .
Wind load must be calculated depending on the height. Calculations should be made using the formula W = Wo * k. In this case, Wo is a normal wind load for a particular region, and k is a coefficient that depends on the height and nature of the terrain on which the house is built.

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