Wooden floor trusses
Why MiTek wooden trusses are better than other types of floors
In low-rise construction, it is advisable to use lightweight materials for attic, attic and interfloor floors. This allows to reduce the load on the foundation and load-bearing walls, which, on the one hand, ensures the reliability of the structure, and on the other hand, significantly reduces construction costs.
Usually wooden or iron beams are used for floors, but gradually wooden trusses created by the new MiTek technology developed in America are increasingly used instead.
There are two types of trusses made by Mitek technology:
Let’s consider each of the types in more detail.
Trusses with wooden bracesThe peculiarity of MiTek technology Wooden trusses are light, reliable and quick-assembled structures made of two parallel beams connected by wooden braces with the help of metal toothed plates. They are produced in the factory. The main material is structural wood of class C-24 and C-22 from coniferous species.
Selection of metal connecting elements and all necessary calculations (truss spacing, beam cross-section) are carried out using specialized software – Pamir program. The program allows you to take into account all the nuances: the length of the span between the supports, the total amount of loads, compliance with the requirements of the regulatory framework.
What new opportunities does the technology provide
- Unlike wooden beams, trusses do not bend and do not creak. This increases the comfort of residents and improves the performance of flooring.
- The light weight of the structure allows to facilitate and speed up loading and unloading and installation works.
- Trusses are suitable for any type of walls (brick, concrete, wooden);
- The structures are convenient for laying communications between the bars;
- Aesthetic appearance of trusses allows leaving them without cladding;
- Wooden trusses can be installed without intermediate supports at a distance of up to 9 m.
Variants of floor application
Due to their special qualities, wooden floor trusses can be used quite widely:
- As interfloor or attic floors in residential buildings, including frame buildings;
- As attic floors in buildings where a large span between the load-bearing walls is required;
- As an additional support for floors in restored buildings;
- As logs in the device of wooden flooring;
- As formwork for concrete foundations, various reinforced concrete structures.
POSI beams. Trusses with posi-elements.
POSI beams – system for interfloor flooring.
Posi beams consist of wooden belts and metal braces Posi-Strut. Due to the low weight of wood and high strength of steel, such trusses can cover much larger spans than with simple wooden beams and lay the necessary communications in the space between the posi-struts.
Advantages of POSI-beams:
- Low weight of the product due to the rational use of materials;
- Possibility of laying communications in the space of POSI-beams;
- High bearing capacity and improved load distribution;
- Large unsupported span, depending on the type of POSI-beam;
- Possibility of arranging heavy decks, which allows to improve sound and thermal insulation;
- The use of Posi-Strut steel braces in attic trusses significantly speeds up the installation of the structure and increases its bearing capacity.
POSI-beams are available in six standard heights
Table 1: Dimensions of POSI beams
|Type||Distance between girders (mm)||Truss height (mm)|
Dimensions of gaps for laying communications
The gaps between braces and belts allow laying utilities and systems such as water supply, heating, electricity, ventilation in the girder itself. Individual sizes and shapes can vary (rectangular or round)
Fig. 2.1. Dimensions for communications in POSI-beam
Table 2: Dimensions of communication holes in POSI-beams
|Type||А(mm)||D(mm)||square||Rectangle height (H)|
|Rectangle width (W)|
* POSI-beams are mainly used in cases when it is necessary to lay communications in the interfloor space
POSI-beams in attic trusses
POSI-beams can also be used in mansard trusses.