Necessary elements for the truss structure + Photo and Video

Wooden trusses are the basis of any roof supporting structure. It is on them that strength and service life depend. After all, they must withstand a layer of covering, insulation material of the so-called roofing "pie"), the weight of workers during maintenance and repair work, precipitation in the form of snow, rain and the force of winds, and in some regions take into account the seismic factor.

The main task of the truss is the distribution of the load, which presses on the roof and walls of the building. - ring dowels or, if possible, use the cutting method.

If you carry out work on a large building where the span is more than 16 meters, it is more correct to take trusses with stretched metal racks, since wooden ones will be problematic fasten the knots.

General

When installing a wooden truss, labor costs are increased. It is much faster to use a combined truss. For building a residential building The option with open trusses is not suitable, the system must be closed with a ceiling. The open design is ideal for industrial construction.

When constructing low-rise buildings, wooden roof trusses are more economical to use coniferous sawn timber. To prevent sagging of the rafter beams, you need to install a middle run or use spacers and cross beams.

IMPORTANT! Choose the right truss shape. It is necessary to consider:

1. At what angle is the roof
2. What type of connection is expected
3. Which covering material will be used
4. The presence of a ceiling.

There are requirements for the rafter system:

• Maximum strength
• Rigid connectors in various configurations
• Light weight
• High quality materials.

Rafter systems are:

1. Rack - two or three supports from the beams with an effort expand the Mauerlat. The distance between the beams is at least 8 meters. The rigidity of the structure is given by racks, crossbars, rafter legs.
2. Hanging - used for spans of 6-10 meters without internal load-bearing walls.
3. Combined - used in the case of complex roof trusses.

The height of the truss is calculated by the formulas:

• For rectangular -1 / 6x L
• For triangular - 1 / 5x L
• The letter L- denotes the length of the trusses.

Practical advice

For the construction of a cottage, the best option would be a triangular rafter option. This is very useful for gable roofs and roofs with hanging rafters. The installed tie-down devices give stability to the shed truss. These bundles of wooden slats are attached to the base of the post located in the center.

Necessary elements for the truss structure:

• Metal uprights
• Wooden bars
• Metal corners
• Plumb line
• Bolts and brackets
• Profile tubes
• Welding device

It is permissible to make a roof truss with your own hands. You should start by marking the rafters, all the preparatory work and the manufacture of parts and the preliminary assembly "for profit" are done on the ground. The finished structure is installed in a vertical position parallel to the wall being installed.

ATTENTION! Roofs. Take their construction very responsibly.

Advantages of trusses

• No support wall is required, which allows you to make a free layout
• Internal walls can be completed after completion of roofing
• Quick and easy assembly
• Gathering takes place on the ground, no need to climb the roof
• If necessary, the roof can be removed, build another floor and mount it back
• Economical consumption of materials
• Simplicity of insulation (the height of the insulation even in the corners of the truss is not less than 400 mm)

Cons

• A large number of fasteners + - 10,000 units.
• Mandatory specialized calculation
• Number of people from 2 to 4.
• Wooden rafters or reinforced concrete structures.

Wooden systems are warmer and more familiar, on assembly-press machines any size, configuration can be made and processed with moisture-proof and refractory impregnations. The material will be delivered to the construction site for assembly and construction.

Reinforced concrete trusses are more durable than water and frost-resistant, but very heavy, therefore, they are mainly used for the construction of industrial premises.