WTA-Recommendations

WTA-Guideline 2-09-20/E                   Download

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Technical requirements for renovation plasters are specified in the WTA guideline “Renovation mortar systems”. Systems of renovation mortars are generally composed of a splatter dash plaster, sometimes a base plaster, the actual renovation plaster, and a top layer or a coat of paint. These materials have to be tuned with respect to each another. Test methods and measurements for quality assurance are described and details of the processing are explained. The WTA certification process for renovation mortar systems is described. Some problems of planning and processing are also discussed.

WTA-Guideline 2-13-15/E                   Download

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This WTA guideline deals with the evaluation of existing External Thermal Insulation Composite Systems (ETICS) with expanded polystyrene and mineral wool, and gives guidelines for their routine inspection, maintenance and renovation. Moreover, aspects of improving the energetic performance of existing systems are discussed.

WTA-Guideline 6-2 Edition: 12.2014/E                  Download

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High moisture in building components can result in hygienic problems, damage to materials and energy losses. The first edition of this guideline provided internationally recognised methods for realistic analyses of transient temperature and moisture behaviour in building components. It has served as basis for an international standard on this topic. This new edition of the guideline accounts for the advances in science and technology. It provides specifications for numerical simulation methods and recommendations for their practical application. The underlying model descriptions and necessary material parameters are specified. Furthermore, the choice of climatic boundary conditions, the accuracy check procedure and the documentation of input and output data is described. Contrary to the standardised steady-state Glaser method, the numerical simulation includes the heat and moisture storage of building materials as well as latent heat effects by condensation or evaporation and the parallel occurrence of vapour diffusion and liquid transport. The climatic boundary conditions are temperature, relative humidity, radiation and precipitation. The hygrothermal material parameters are generally taken from the database provided by the distributor of the simulation programme. They may also be determined by appropriate laboratory tests or approximated from standard material data.

WTA-Guideline 6-4 Edition: 10.2016/E                  Download

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Internal thermal insulation added retroactively has an especial influence on the behaviour of the building with respect to building physics. Particular attention should be paid to vapour diffusion from inside to outside, because of likely condensation at the former inner surface of the wall, and because of the reduced drying potential of the external wall after wetting by driving rain.

This guideline is part of a series of guidelines which deal with these specific aspects of moisture transfer. General planning suggestions are made and possible risks are defined and discussed. A verification of moisture protection is vital to fully assess internal thermal insulation measures and to avoid damage resulting from the intervention.

In general, this verification of moisture protection should be conducted using computer simulations of the coupled heat-moisture transport according to WTA guidelines 6-1, 6-2 and particularly 6-5. A simplified verification procedure is presented, and the necessary boundary conditions are determined.

WTA-Guideline 11-1 Edition: 12.2020/E                  Download

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In the event of fire, the spread of fire and smoke can lead to personal injury and damage to property. For this reason, the basic fire protection requirements for standard buildings are regulated in the model building regulations [1] or the building codes of the federal states. In addition, special constructions regulations and guidelines exist for certain special constructions, which must be observed. However, these regulations originally only apply to new buildings. Existing buildings often deviate from the currently valid building supervision regulations or the legal provisions introduced as technical building regulations. A building-specific and protection-oriented fire protection planning with appropriate consideration of the existing structure therefore requires a particularly intensive study of the fire protection requirements.
In addition to the fire protection performance of existing buildings, the escape route situation and the preventive measures to prevent the occurrence of fire and, in particular, the spread of fire or smoke must be considered from a conceptual point of view.
Fire protection occupies a special position in building law due to the considerable dangers for the users of a building and the possible consequential damage that can be avoided in the event of fire. The resulting basic and individual requirements of the model building regulations or the respective state building regulations require a thorough examination of an existing building. This guideline therefore aims to describe the principles of fire protection planning for existing buildings. Practical solutions are shown for conflicts arising from interventions in existing buildings. In this context, reference is made to relevant standards and guidelines as well as supplementary technical literature.
In addition to this guideline, other WTA guidelines from other areas of fire protection should also be taken into account.