In order to save wood and increase durability and fire resistance,

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The rafter panels of both slopes are connected from above with a ridge truss, along which the ridge panels are laid. The longitudinal tray frames consist of posts and braces made of paired boards with a cross-section of 25X100 mm with plank inserts laid between them. The supporting frames-linings are made of boards knocked together in pairs on the edge, fastened with a diagonal strut. After the rafters are assembled, a 50x120 mm section tie is nailed in place. All joints are made with nails.

it is advisable to make the load-bearing structures of pitched roofs from reinforced concrete. However, replacing wooden rafters with prefabricated reinforced concrete ones is impractical due to the increased weight and high labor intensity of the roof load-bearing structure, as well as the irrational use of chile mobile database concrete, which works much more efficiently in ribbed and folded reinforced concrete panels of prefabricated roofs. Therefore, it is recommended to make reinforced concrete load-bearing structures of pitched roofs rafter-less from large-sized factory-made panels.

Fig. 127 shows one of the options for a prefabricated reinforced concrete pitched roof made of ribbed panels with the dimensions of 6000x120 mm. The height of the longitudinal rib of the panels is 300 mm. Another option for constructing a roof from ribbed panels with an eaves overhang is shown in Fig. 127, b. In this case, there is no need to lay individual cornice blocks that need to be secured.
Thin-walled folded roofs made of wavy and rectilinear profile reinforced concrete folded panels are very economical.

The folded corrugated panel (Fig. 128) is a thin-walled reinforced concrete element with a thickness of 25 mm in the compressed zone and 30 mm in the stretched zone. The waves of the panel are 30 mm wide, 140 mm high, and the panel width is taken to be 1200 mm. The end parts of the panel have transverse diaphragms, which are the supporting part and stiffening ribs.
The folded panel of a rectilinear profile (Fig. 129) has the form of a trapezoidal fold with a thickness of 25 mm, a total height of 295 mm and a width of 1200 mm.

In buildings that do not have internal supports, it is impossible to arrange layered rafters. In this case, rafter trusses are used as load-bearing structures of the roof, in which the attic floor is suspended. Fig. 132 shows an example of the design of a suspended wooden attic floor. Wooden purlins are suspended in a direction perpendicular to the tightening of wooden hanging rafters on clamps made of strip steel. Wooden beams are suspended perpendicular to the purlins, between which the inter-beam filling is laid, the same as in ordinary attic floors, but lighter. In general, to reduce the load on the hanging rafters or rafter truss, a structure with as little dead weight as possible should be selected for the suspended floor.