WUFI® Pro updates

This page offers an overview of the current updates for WUFI® Pro and the accompanying databases and tools.

You can display the internal version number of your WUFI® Pro by choosing the menu item “? → About WUFI“.
The current version of WUFI® Pro is 6.7.0. (as of March 10, 2023).

March 10, 2023



  • 29 new materials since DB
    • 9 new products
    • 10 new Korean materials
    • 10 new Japanese materials
  • Corrections to materials
    • GlasRoc Sheathing name with “(until 2022)” added
    • CERABRAN AEROPUTZ: moisture-dependent thermal conductivity changed
    • Cleancrete: Thermal conductivity corrected
  • WUFI Light: Absorption and emission values according to DIN 4108-3 selectable

The new version comes with WUFI® Graph 2.25.2 and database version

June 24, 2022



  • 21 new materials have been added to the material database, 20 of them are new products.
  • 27 new absorption and emission values have been added. (Feature ID 2786)
  • Fixes in the climate dialogs prevent possible problems at program start.
  • Updates for info texts, minor bugfixes and corrections have been applied.
WUFI® Graph


  • It could happen that after a program exception the configuration file had been corrupted and WUFI-Graph was unable to start. This error will now be intercepted: If the configuration file is unreadable, it is replaced by a standard configuration. Also, all errors occurring during the configuration phase are now captured and displayed to the user. (Bug ID 2800)
  • A problem has been fixed which could occur when an area with a concave corner was selected in the component. (Bug ID 2774)

The new version comes with WUFI® Graph 2.25.2 and database version

December 06, 2021



  • Material database with 29 new materials
  • Updated WUFI® program help
  • Updated help for postprocessor thermal transmission
  • Minor bugfixes and corrections
WUFI® Graph

The new version comes with WUFI® Graph and database version

March 16, 2021



  • 4 new materials have been added to the material database, the new database version is DB 27.1.14.
  • Improvements of the material database interface.
The new version comes with WUFI® Graph 2.24.1 and database version 27.1.14.

November 19, 2020



  • 28 new materials have been added to the material database, the new database version is DB
  • WUFI automatically tests the material data sets for consistency. After an update, the validation procedure required that the tables for the liquid transport coefficients start with an entry for the water content zero. However, the liquid transport coefficients of the materials provided by TU Vienna start with water contents greater than zero and were flagged as problematic even though they are perfectly valid. The relevant validity criterion has been removed from the consistency tests. (Bug-ID 2720)
  • In version 6.3 the file format of the 20 South Korean climate files was changed from WAC to WBC. However, an error in the time columns of the WBC files led to incorrect angular conversions of the solar radiation data. The update to WUFI 6.4 was intended to replace these files with corrected versions but the old files were not overwritten during the update. Now, finally, the 20 climate files are replaced by corrected versions. Users whose first installed version was 6.4 or later were not affected since there were no old files to be overwritten. (Bug-ID 2640)
  • 66 new South-Korean climate files have been added: One typical test reference year, one year with extreme summer and one year with extreme winter for each of 22 locations (the 20 previous locations, plus Gosan and Heuksando).
The new version comes with WUFI® Graph 2.24.1 and database version 27.1.8.

July 23, 2020



  • 25 new materials have been added to the material database. The database version is DB 27.0.16.
  • The drop-down list for the exterior and interior heat transfer coefficients now includes four values from Austrian standard ÖNORM 8110-2. (Bug-ID 2693)
  • Error messages occurring during reading of the climate file now include the number of the error-provoking line to allow easier identification of the problem. (Bug-ID 2669)
  • In an empty catalog of the constructions database, a right-click into the empty constructions list opens a pop-up menu allowing to paste a copied construction or to create a new construction from scratch. The dialog for creating a new construction did not open; this has been fixed. (Bug-ID 2676)
  • When an XML material file created by WUFI-2D was imported into the material properties dialog of WUFI-Pro, the basic material data were not updated. In addition, in material datasets subsequently imported from the material database, the basic values also failed to update, and the OK button remained deactivated. This has been fixed. Importing an XML file into a user-defined catalog of the material database was not affected by this bug. (Bug-ID 2670)
  • In the material database, the displayed list of available materials can be sorted by any of the columns showing the basic material data. The attempt to sort the list by the heat capacity resulted in a program crash, however. This has been fixed. The bug had been caused by introduction of the entry “—” for the heat capacities of materials whose heat capacity is to be determined from the enthalpy table and not to be taken from the entry in the basic values. (Bug-ID 2683)
  • The material database contains some materials which lack hygric parameters and are intended for purely thermal calculations only. They are hidden by default; for use they can be made visible in the catalog “Materials for thermal calculations …”. The option “All Sources” in the material database tree shows all materials from all sources, and also showed the thermal materials, even if they were supposed to be hidden. This has been fixed. (Bug-ID 2695)
  • The Recycle Bin for the deleted constructions in the constructions database showed the text “right-click here” when it was empty. However, no actions can be started by a right-click in the empty Recycle Bin, and the misleading text has been removed. (Bug-ID 2696)

December 05, 2019



  • Adjustment of the moisture dependent thermal conductivity in the material has been simplified
  • Improved database connectivity
  • 11 new materials
  • Improvements of Finnish climate data
  • Improvements of Korean climate data
  • Improvement of the radiation rose
  • Error message when loading inconsistent climate data
  • Minor bugfixes and corrections
WUFI® Graph


  • Minor bugfixes and corrections


April 06, 2018



  • Supports FullHD displays.
  • Issues with opening and displaying the climate dialogue have been resolved.
  • Corrections to the material and the construction database has been made.
WUFI® Graph


  • Long waiting times when printing have been fixed.
  • Issues opening some result files have been fixed.
  • Minor bugfixes and corrections have been made.
  • Languages added: Korean, French, Japanese.


March 31, 2017


  • The Adaptive Time Step Control has been re-introduced in an improved version.
  • The radiation rose in the climate analyser dialog now has a legend explaining the colours used in the diagram.
  • Inconsistencies have been eliminated which were created by switching between SI and IP units.
  • Inconsistencies have been eliminated which arose when a project file was opened in a different language.
  • A bug in the temperature transfer curves of the options “Low Moisture Load” and “Medium Moisture Load + 5%” for the indoor climate model “EN 15026 / WTA 6-2” resulted in too high indoor air temperatures. This has been corrected.
  • In the calculation mode “explicit radiation balance” the radiative heat exchange is directly calculated. Therefore the radiative part of the heat transfer coefficient has to be subtracted. If a wind-dependent heat transfer coefficient was used, the radiative part of the constant heat transfer coefficient was erroneously subtracted instead, leading to inconsistencies in the heat transfer in some cases. This has been corrected.

Material database

DB 26.0

  • The enhanced search function of the database now allows for searching the material names in any parts or sequence – optionally also within the material information.
  • 12 new wooden materials (from the AIF project) have been added to the material database.
  • 18 new company products have been added to the material database. Find it here under “Material characteristics: Companies’ products”.
  • The North American material database and the example cases have been revised and supplemented. 17 new materials and 23 example construction have been added.

Weather data

  • New Hygrothermal Reference Years (HRY) for Germany are now available which represent the German climate by 11 representative climate locations
    • Braunlage, Chemnitz, Fichtelberg, Fürstenzell, Hamburg, Kassel, Lindenberg, Mannheim, Potsdam, Stötten, Warnemünde
  • In addition to the normal HRY also a cold HRY and an eight-year Design Climate Sequence have been added for each of these climate regions.
  • 5 new climate data for Italy have been added:
    • Agrigento, Bari, Catania, Cosenza, Oristano
  • For climate files listed in WUFI®‘s user folder, geographical data added by the user were not forwarded to the program if the “Show on map” option was not checked. This has been corrected.
  • If WUFI® was in IP mode by default, climate selection could fail. This has been corrected.

May 19, 2016


  • A new materials database interface with a clearly laid out tree structure, convenient search function and new options for managing user-defined data.
  • A new climate menu that allows you to pick a location from the globe, performs further analysis on the related climate data file and displays the progression of all the climate elements contained within it.
  • A user-defined climate database with the option to display your own locations on the map.
  • A simplified and more intuitive user experience.
  • A new, faster and more stable calculation engine.
  • An interior climate model updated in line with Germany’s revised WTA 6-2 specification. Further updates allowing for free configuration of interior climate models to follow soon via a free update.

Material database

DB 26.0

  • A materials database expanded to include a range of new materials characteristics.

Weather data

  • Additional climate files for 20 locations in South Korea.
WUFI® Graph


  • A WUFI® graph tool for evaluating results. For the first time, it is possible to directly compare different scenarios in a single view, compare WUFI® Pro (1D) and 2D simulation results and even evaluate conditions for multiple grid elements – including relative humidity. As a result, it is possible to evaluate wood components in accordance with Germany’s new WTA 6-8 specification governing the humidity assessment of such components – including the requirements set out in the specification for dynamically evaluating the ongoing risk of wood rot.

January 28, 2015


  • #899: The dialog for selecting a source strength file for a heat, moisture or air change source could not be closed after selection of a file. This problem (inadvertently introduced with version 5.3.3) has been fixed.
  • #1005: Since version 5.2, the online help files are always installed in all existing languages (German, English, Japanese) to allow switching of the help file language when the WUFI language is switched (and if the corresponding help file language exists). Now switching the help file language actually works. A problem affecting the language control of the database when installing a Japanese-language WUFI version has been fixed.

Material database

DB 24.78

  • Two generic soils have been added to the “Generic Materials”. Nine soils for purely thermal calculations have been added to “Materials for thermal calculations”. Twelve soils derived from a soil material database have been added to the “North America Database”.
  • Absorption and emission coefficients for “Gravel roof, generic model”, “Green roof, generic model” and “Green roof, Optigreen system” have been added to the coefficients’ drop-down list.


December 2, 2014

Climate Reader

  • #978: Some of the hourly indoor climate models in WUFI Pro and WUFI 2D are to be derived from the hourly outdoor climate selected by the user. However, when a multi-year outdoor climate was used, the climate reader procedure used by both WUFI Pro and WUFI 2D derived the indoor climate only from the first year of the outdoor climate file and used these first-year indoor data for the remaining years as well. This has been fixed.

Climate Reader

  • #979, #829: Trying to open the “assembly” node of the project explorer could result in a program crash. This has been fixed.
  • #994: The μ-value 1500000 of the “vapour barrier (sd=1500m)” corresponds to the permeability 8.6e-5 perm inch in IP units and is correctly converted when units are switched. However, when a WUFI in IP mode read the vapour barrier data from the material database, the permeability was rounded to zero because an insufficient number of decimal places was allowed. Now, reading from the database is done with a more flexible number of decimal places.


May 16, 2014


  • #824, #883: The drop-down list in the language selection dialog now has a little icon added to each language entry, showing the flag of the respective country. Users who inadvertently switched to an unfamiliar language thus can identify their own language without needing to know what their language is called in the currently active language.
  • #828: When the ASCII output function was directed to write a profile to an existing file and the “Overwrite?” question was answered “No”, WUFI produced an I/O error. This has been fixed.

Thermal Transmission

  • The German version of the Thermal Transmission postprocessor now has a German online help.


  • The new WUFI-Bio version has version number 3.2. WUFI-Bio now can be switched between German, English and Japanese. The language selection is now automatically adopted from WUFI-Pro. Manual selection is possible, too, using a separate language selection tool. The entire data set can now be saved as a project file. The user can now choose the colors of the curves.


DB 24.77

  • A vacuum insulation panel “VIP generic” has been added to the material database.
    The material data for “Bayosan LeichttonMörtel LTM 81® have been corrected (the bulk density has been set to 988 kg/m³, the water absorption coefficient has been set to 0.027 kg/m2s0.5 = 1.6 kg/m2h0.5).
  • 50 new product materials have been added to the material database:

Weather data

  • Weather files for Hradec Králové and Milan have been added.
  • Weather files for Bordeaux, Brest, Nancy, Marseille and Trappes have been added.
  • The weather file for Kassel has been removed because it appeared doubtful whether the data were up to today’s standard. (The test reference years for Kassel are still available.)


December 20, 2013



  • #813, #587: Switching between languages was previously done with the separate tool “WUFI5_Lan.exe” in the “Tools” folder which, however, required administrator privileges. Now non-administrators, too, can switch languages with the menu item “Language” in the menu “Options”. Switching the language requires a re-start of WUFI.
  • #453: WUFI interpolates logarithmically between the table entries for a moisture-dependent µ-value. However, in the accompanying diagram the table entries were shown connnected by straight lines, which would be correct for linear interpolation only. In order to make the diagram conform to the interpolation method actually used by WUFI, its y-axis is now subdivided logarithmically, so that the straight lines in the diagram correspond to exponential curves. Unfortunately, as implemented in the current version this results in somewhat non-intuitive logarithmic axis labels which will, however, be revised in future versions.