One of the most important elements of the house is its roof, which protects the house from various atmospheric phenomena of nature and keeps it warm. Therefore, the roof of the house should be reliable and durable. The basis of a solid roof is its frame - truss system. The strength of the roof and, ultimately, the durability of the building itself depend on the correctly designed and correctly assembled structure of the rafter frame.
Roof made of metal tiles.
The rafter frame structure depends on the type of roofing and roof loads. The load on the rafters are permanent and temporary.
Constant loads are:
Temporary loads include:
The location of the tightening in the truss system.
During the design of the frame, its type is primarily determined (depending on the method of installation of the rafters). Rafters can be trailing, nested or combined. The number of rafters, the distance between them and their section, depends on the type of attic. It can be attic or non-residential.
Coniferous wood is usually used for making rafters. The moisture content of the material should not exceed 20%. Timber used for the construction of the truss system should not have rot and blue.
The material of rafters, lathing and counterbriquettes is treated with antiseptic and flame retardants.
Table for calculating the length of the rafters, the pitch between them and the cross-section of the bar.
The creation of a roof begins with the selection of the type of roof and the material of the roof. In individual housing the most popular roof of the metal. This type of roof is light, durable, strong, has an attractive appearance, is quite simple to install and inexpensive. Metal tiles are much lighter than ceramic tiles (1 square meter of ceramics is about 35 kg heavier than metal tiles).
Then you need to calculate the number of rafters and the step of their installation. When building private houses, the step between the rafters is set from 0.6 to 1.0 m.
To calculate the required number of rafters, you need:
Calculation example: Let the slope be 18 meters and the step size be 0.8. Hence, 18: 0.8 + 1 = 23.5 = 24 rafters are required to construct a roof frame.
Rafter systems for different types of roofing have slight differences. They mainly depend on the weight and size of the coating sheets. The following tools and materials will be needed to set up the truss system:
The optimal pitch and cross section of the rafter under the metal tile.
Having made the necessary calculations, preparing the required material and tools, proceed to the assembly of the roof system under the metal tile. The order of work is as follows:
This completes the installation process for the roof frame, then it is required to prepare it for laying the roof.
The rafter system on which the metal tile is laid is prepared as follows:
The installation of the truss system is prepared for laying the covering of metal tile.
If you have certain building skills and two assistants, you can make a strong framework for the roof yourself.
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