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 braces

The 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.

Drawings of floor trusses by Mitek technology

Floor trusses with wooden braces in a building with load-bearing stone walls. Kyiv region

Installation of a block of floor trusses

Floor trusses of a residential building

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.

Posi-beam is a wooden truss with metal braces.

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.

Drawings of floor trusses in Mitek technology

Floor trusses with wooden braces in a building with load-bearing stone walls. Kyiv region

POSI-beam dimensions

POSI-beams are available in six standard heights

Table 1: Dimensions of POSI beams

Type Distance between girders (mm) Truss height (mm)
PS 8 108 202
PS 9N 134 225
PS 10N 159 253
PS 12 210 304
PS 14N 282 373
PS 16N 330 421

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)
50 75 100 125 150 175 200
Rectangle width (W)
PS 8 108 105 95 270 180 90
PS 9 134 130 115 310 240 180 100
PS 10 159 150 135 320 270 210 160 80
PS 12 210 190 155 350 310 260 210 160 110 70

* 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.

Posi-beam is a wooden truss with metal braces.