KEIM Exterior insulation systems

Wind suction loads and planning dowels

Permanent structural stability is a basic requirement of every ETIC – Good planning of the possible loads and corresponding anchoring are thus indispensable.

ETIC systems are lightweights, their weight alone can usually be borne by the adhesive bond. It is the wind, often coming in gusts, that takes it toll on your building depending on the location and building's geometry. One of the jobs of an engineer is to plan the resulting loads and how these can be absorbed. Simplified methods can be used to a certain extent for initial calculations or smaller buildings. Anything more belongs on the desk of a qualified and experienced planner.

Starting from the location of the building being planned in a wind zone defined in building laws, from the height of the building, the kind of permit and the building arrangement, they can choose between the standard method, simplified method or a practically-oriented method.

Wind zones and wind load

Just which wind effects you have to reckon with depends on the building's location and covered by the DIN EN 1991-1-4/NA standard. Germany is hereby divided up into 4 wind zones. It Just which wind effects you have to reckon with depends on the building's location and covered by the DIN EN 1991-1-4/NA standard. Germany is hereby divided up into 4 wind zones. It is easy to determine in which of these zones the building is located using the wind zone map.

The "Deutsche Institut für Bautechnik" has published an assignment according to administrative boundaries for borderline cases. You can download this table via the following link:  → DOWNLOAD NOW

A knowledge of the wind zone is sufficient for the practically-oriented method. Loads to be assumed in accordance with the standard have to be determined for the calculation procedure.

STANDARD METHOD

The standard method involves a calculation of the surface areas by the engineer as a function of the building's height. It has to be used for curved, interrupted and very divided buildings or structures that do not have a rectangular layout. This method has also proven beneficial for very high buildings.

 

Simplified method

In the simplified method, the effects of wind on buildings up to a height of 25m can be assumed to be constant over the overall height, thus avoiding the necessity of complicated detailed calculations. However, wind pressure and resulting surface areas with a corresponding wind suction have to be determined for each side of the building. The building dimensions hence result in the surface areas A, B and C that require a different number of dowels. This method has proven itself for larger projects with a clear geometrical layout (rectangular cube, simple rectangular layout).

Practically-oriented method

The practically-oriented method is intended for tradesmen who simply need to know how many dowels will be required for smaller buildings, in particular detached and semi-detached houses with rectangular layouts. The results of the calculations are generally summarised in tables for certain dowels depending on the insulation material used and type of anchoring. This makes it easy to apply and always results in a standard number of dowels for the complete building. Further information and tables can be found in the → Technical Guidelines
 

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