Windrispe

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The wind panicle ( panicle for short ) is usually a diagonal stiffening of a wooden roof structure made of wood ( roof battens or boards) or flat steel strip in order to avoid the roof truss folding over in the longitudinal direction ("longitudinal stiffening"). When the roof is at rest, no forces should act on the wind panicle. It is primarily used when the wind blowing in the longitudinal direction of the roof exerts pressure and suction on the gable surfaces. In the past, there were no wind panes in the purlin roof if the headbands could take on this task.

A single wooden wind panicle per roof can be sufficient because, unlike the wind panicle tape, it can absorb tensile and compressive forces. Wooden wind panes are usually attached to the underside of the rafters. If the roof is later removed, they can be a hindrance at this point. When laying above the rafters in the level of the counter battens , however, ventilation underneath the roof covering, which is to be made possible by the counter battens, would be impeded or prevented.

Today mostly flat perforated strips are laid above rafters or counter battens. These usually run diagonally across the entire roof area. At least two wind panic strips must be laid in such a way that they form a cross when looking through the roof surface. Either two strips are laid crosswise on one roof surface or a strip is tensioned on the second roof surface with an inclination in the opposite direction to the first strip. If higher wind loads are to be expected, two strips are laid crosswise on both roof surfaces.

If the roof is planked with wood-based or wood-fiber panels on the inside or outside of the rafters , these can take over the longitudinal stiffening of the roof if the manufacturer of the panels allows this and the manufacturer's specifications are followed. This is particularly advantageous if larger cutouts or several dormers are provided in the roof , which would be in the way of the wind panicle.

Various tensioning devices such as turnbuckles, tensioning devices and collets are available for tightening the wind panicle band. Depending on the situation, the belt can also be tensioned using a tensioning belt or an inclined wood screw. On small roofs this is often not done at all.

The design of wind panes has so far been based on DIN 1052, which has now largely been replaced by DIN EN 1995-1-1 and the associated national appendix DIN EN 1995-1-1 / NA.

literature

  • Johann Christian Friedrich Käferstein, The foundations of civil architecture for country people , 1776, p.233 §403
  • Hans-Jürgen Schneider (Hrsg.): Construction tables for engineers , Werner Verlag

Footnotes

  1. ↑ Bracing systems - basics , pages 9f and 19f, series of publications "Technik im Holzbau", publisher: Holzbau Deutschland - Bund Deutscher Zimmermeister in the Central Association of the German Building Industry, August 2011
  2. ↑ Samuel Schneider: 3 tips: Attach and tighten a wind flare tape ; accessed in July 2019
  3. ↑ Proofs and constructive implementation of stiffeners with wind panic strips - Technical bulletin 06/004 Dec. 2013 , timber construction DIN EN 1995-1-1, VPI - Federal Association of Test Engineers for Structural Engineering eV ... as well as a second source with the same content: ... Brief information No. 128 - Use of wind flare tapes , engineer box, static-constructive committee (Stako) of the state association of test engineers for structural engineering in Baden-Wuerttemberg, April 14, 2008