Construction principle

Lightweight, load-bearing and cross-sheeted wooden shed, which is particularly suitable for a diffusion-free construction. Several planes are created by screwing the wooden panels in a vertical and diagonal direction. Principle: The distances of the wood determine the strength and thickness of the construction. A rotating bolted frame connects the uprights and creates a surface limitation.

Wandaufbau HarKun

Wall construction HarKun

Usual wall elements / standards of the previously used technology

Timber frame or wooden stand construction is currently a common building construction in the area of ​​single-family houses, small buildings and buildings and structures on existing buildings. Vertical vertical columns or columns and two horizontal wooden beams of wood are connected by means of metal connectors in the thickness of the insulating layer (180 to 300 mm). The uprights are fastened to a grid, which allows the effective planking of the wood to a wall surface. In order to reduce cold bridges, double T-beams are increasingly used. Wall elements in today’s usual wooden stand construction usually require plate materials such as OSB, plywood or wood fiber boards, which inhibit diffusion, as well as metal windscrews with tensioning devices or a diagonal formwork. Metal tapes are prone to condensation and are not suitable for frequent wall penetrations. In the case of the use of slab materials, construction films, building materials and adhesive tapes are necessary both for the wind tightness and for compensation for the different diffusion gradient of the wall construction in order to prevent condensation in the insulation. Nevertheless, it is negative that air humidity penetrates the insulation layer even with synthetic insulation materials such as styrofoam, polyurethane, mineral wool, etc.

The result:

  • Due to lack of capillarity, this process leads to long-term moisture penetration of the materials mentioned.
  • The films and sealing sheets used are usually made of plastics, and regulate the moisture by steam diffusion and not capillary. The capillarity of the insulating material is interrupted by different vapor retardant layers. Water can only pass the plane as a gas. The installation of moist materials is therefore very, very questionable.
  • The windproofness of the film brakes the gas exchange so that air changes through the wall hardly take place. Although the insulation is protected by the windproofness in its insulation value, the alternating air movement, a “breathing” between outside and inside is however suppressed. Tentative: the householder sits in a kind of “plastic bag” after the accommodation of his apartment.

Usually, in this connection, an installation plane is additionally mounted in order not to damage the sensitive outer wall layers. However, as in the case of a chain link, the weakest limb always determines the maximum load-bearing force, the vapor-tight and moisture-transporting velocity determines the diffusion-tightest layer which interrupts any capillarity.

Due to this type of construction, the calculated theoretical insulation value is not achieved in practice, since in the recording of the actual total energy consumption, the ventilation requirement suggests about 30% of the energy costs. For this reason, in the construction which is customary today, the owner is almost always advised to install an additional – and thus cost-increasing – controlled and sensor-controlled ventilation with heat recovery.