List of current recommendations
A listing of the current WTA recommendations (in German language) can be found in our order form.
Our online shop is currently under construction. An online order is therefore unfortunately not yet possible.
Order by fax or e-mail
Please send us the completed order form by fax or e-mail.
We charge the following shipping costs:
Shipments within Germany
|up to 500 g||2,50 €|
|more than 500 g up to 1.000g||3,50 €|
|more than 1.000 g||5,50 €|
|Recommendation folder||10,00 €|
For shipments abroad we charge the actual postage costs.
Below you will find the table of contents and the abstracts of the individual recommendations as pdf files behind the recommendation numbers.
For ordering (German versions) please use the order form.
TC 1 Timber and Timber Protection
Thermal processings for control of insects attack on wood in buildings
Dry rot – identification, living conditions, preventive measures, controlling chemical measures, list of performance
|1-4-00/D||Construction protection of wood on historical buildings – Part 2: Roof truss||17,50 €|
Sample taking on Wood – Research on fungi, insects, wood preservatives, wood age and wood type
Disinfection of timber, contaminated by wood protection compounds
Disinfection of timber, contaminated by wood protection compounds
Special measures to control and prevention of wood-destroying insects and fungi in wooden material
TC 2 Surface Technology
Assessment and Repair of Cracked Rendering on Facades
Protective Systems with Respect to Grafiti-Sollin
Lime-based plaster for architectural heritage
Assessment of effectiveness of Anti-Graffiti-Systems (AGS)
Renovation mortar systems
Gypsum mortar in historic masonry and on facades
|2-12-13/D||Facade coating systems for mineralic substrates in the field of old building restoration||25,00 €|
External Thermal Insulation Composite Systems (ETICS), Maintenance, Renovation, Enhancement
TC 3 Natural Stone and Artificial Stone
Restoration for natural stone according to WTA I: Cleaning
Technology of restoration of natural stone: Production of copies by moulding
Restoration of natural stones according to WTA II: Restoration and replacement of natural stone
Assessment of cleaned stone surfaces
Restoration for natural stone according to WTA XII: Cadastral maps to characterise the state and material properties of stone buildings
Restoration for natural stone according to WTA III: Restoring natural stones by restoration mortars or restoration materials
Restoration for natural stone: Masonry joint repair
|3-13-19/D||Desalination of porous building material by means of poultices||17,50 €|
Restoration of In-Situ Terrazzo
Restoration of artificial stone
|3-17-10/D||Water-repelling impregnation of mineral building materials||20,00 €|
Monitoring of natural stone buildings and monuments
Restoration of interior natural stone tiled floors
TC 4 Waterproofing
Evaluation of masonry
Sealing of structural elements in contact with soil at a later stage
Mechanical horizontal barriers for existing buildings
|4-9-19/D||Subsequent sealing and restoration of building and component socles||30,00 €|
Injection techniques with certified injection materials against capillary moisture transport
Measuring the water content or the moisture of mineral building materials
Goals and control of treatments of internal mould fungus damage
TC 5 Concrete
Maintenance of concrete constructions - model contract
|5-6-99/D||Assessment of Concrete Structures||15,00 €|
|5-7-99/D||Testing and Maintenance of Concrete Structures||15,00 €|
|5-8-93/D||Protection and restoration of concrete – Prerequisites for the substrate, preparation and testing||17,50 €|
Protection and restoration of conrete – requirements
|5-17-21/D||Protection and restoration of concrete: Restoration concepts||15,00 €|
Injection of gel
Bounded construction method – historic block pavement
Monitoring the quality of fresh concrete in Switzerland
TC 6 Building Physics
A guide to hygrothermal computer simulations
Simulation of Heat and Moisture Transfer
Calculative prognosis of mould growth risk
Internal thermal insulation according to WTA I: planning guide
Interior insulation according to WTA II: Evaluation of internal insulation systems with numerical design methods
Assessment of humidity in timber constructions – simplified verifications and simulation
Airtightness of buildings, Part 1: General principies of planning
|6-10-15/D||Airtightness of buildings, Part 2: Detailed planning and execution||20,00 €|
Airtightness of buildings, Part 3: Measuring Procedure
Climate and climate stability in historic buildings
Drying techniques for water saturated building elements, Part 1: General principles
Drying techniques for water saturated building elements: Planning, execution and controling
|6-18-19/D||Infrared thermography for buildings||30,00 €|
TC 7 Structural Behavior and Damage Diagnostics
Conservation and maintenance of masonry – Construction and structural behaviour
Historical timber structures – State determination and assessment of the load bearing capacity of damaged and deformed timber structures
|7-4-21/D||Assessment of the compressive strength of existing masonry made of small-sized bricks or blocks||25,00 €|
TC 8 Half Timber and Timber Construction
Restoration of half-timbered buildings according to WTA I – Requirements for half-timbered buildings with respect to building physics
Restoration of half-timbered buildings according to WTA II – Checklist for planning and execution
|8-3-22/D||Restoration of half-timbered buildings according to WTA III – Partitions in visible, half-timbered constructions||25,00 €|
Restoration of half-timbered buildings according to WTA IV – Exterior facings
|8-5-18/D||Restoration of half-timbered buildings according to WTA V – Internal thermal insulation systems||25,00 €|
Restoration of half-timbered buildings according to WTA VI – Coatings on half-timbered facades partitions / plasters on partitions
Restoration of half-timbered buildings according to WTA VII – Coatings on half-timbered walls / timber
Restoration of half-timbered buildings according to WTA VIII – Load bearing behaviour of half-timbered buildings
Restoration of half-timbered buildings according to WTA IX – Instruction for half-timbered buildings
|E-8-9-22/D||Restoration of half-timbered buildings according to WTA IX – Instruction for half-timbered buildings (revision from March 2022)||8,00 €|
|8-10-20/D||Restoration of half-timbered buildings according to WTA X - Thermal insulation for half-timbered buildings||25,00 €|
Restoration of half-timbered buildings according to WTA XI – Noise control in half-timbered buildings
|8-12-17/D||Fire protection of half-timbered buildings and wooden components||20,00 €|
|8-13-13/D||Rehabilitation of timber beam floors according to WTA I – Vibrations, Deflections, Strength||20,00 €|
Rehabilitation of timber beam floors according to WTA II – Beam ends in exterior walls
TC 10 Preventive Conservation
TC 11 Fire Protection
|11-1-20/D||Fire protection in existing buildings and for architectural monuments according to WTA I: Basics||20,00 €|
Guidelines in Englisch Language
We are in the process of translating WTA-Guidelines of international interest into English.
The English versions are only available as downloads from our sales partner Fraunhofer-Informationszentrum Raum und Bau IRB. A link to the webside of IRB and the download offer is to be found next to the guideline number.
The following guidelines are available in English language:
Renovation plaster systems
WTA-Guideline 2-09-20/E Download
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.
External Thermal Insulation Composite Systems (ETICS) - Maintenance, Renovation, Enhancement
WTA-Guideline 2-13-15/E Download
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.
Simulation of heat and moisture transfer
WTA-Guideline 6-2 Edition: 12.2014/E Download
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.
Internal thermal insulation according to WTA I: planning guideline
WTA-Guideline 6-4 Edition: 10.2016/E Download
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.
Fire protection in existing buildings and for architectural monuments according to WTA I: Basics
WTA-Guideline 11-1 Edition: 12.2020/E Download
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  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.