WUFI® is a family of software products that allows realistic calculation of the transient coupled one- and twodimensional heat and moisture transport in walls and other multi-layer building components exposed to natural weather. WUFI® is an acronym for Wärme Und Feuchte Instationär—which, translated, means heat and moisture transiency. WUFI® software uses the latest findings regarding vapor diffusion and moisture transport in building materials. The software has been validated by detailed comparison with measurements obtained in the laboratory and on IBP’s outdoor testing field.
Component simulation and building simulation
The various versions of the WUFI® software family perform coupled heat and moisture calculations under local climate conditions and for materials, multilayer components, and even whole buildings. Through WUFI® simulation of heat and moisture transport, users can, while still in the planning phases, optimize designs and identify risks and problems.
Literature
The fundamentals required for practical application of heat and moisture transfer calculations and the application of WUFI® software for building physics investigations are presented in numerous publications by staff at the Fraunhofer Institute for Building Physics (IBP) and by other institutions. The numerous examples of applications that use WUFI®, together with many publications on the topic of hygrothermics, are located here.
Instruction manuals and handbooks
This link leads to numerous instruction manuals and handbooks for users who are just starting with WUFI®, as well for advanced users with specific questions.
Workshops
The Fraunhofer Institute for Building Physics offers general workshops on WUFI® at regular intervals. There is one workshop for WUFI® beginners and for those with a general interest in WUFI®, and there is another workshop for existing users who want more advanced training. There are separate workshops that focus on WUFI® 2D, WUFI® Plus, and WUFI® Passive. Since WUFI® developers themselves teach the workshops, a high quality experience can be expected.
News
- Broader applicability: The guideline now applies to various types of fiber insulations and also covers condensation on tight internal surfaces without adjacent insulation
- New evaluation criteria: The defined condensation retention capacities provide practical, measurement-based limit values for risk assessment
- Practical application: Standardized evaluation procedure from simple criteria to the option of case-specific adjustment of the limit values
Updated Guideline: Assessment of Condensation Runoff Risk
February 10, 2026
We have fundamentally revised our guideline for assessing interstitial condensation runoff risk in building components.
The new evaluation criteria are based on research findings from the NaVe-Project (in German) and refine resp. replace the previous criteria.
What's new?
The updated guideline is now available for download. [download]
The English summary from the NaVe project on this topic is provided here.
moreWUFI Pro UK online workshop
January 21, 2026
Next online workshop WUFI® Pro Heat & Moisture Simulation Workshop will take place online on February 25th and 26th 2026 .
Still places available. Book now!
WUFI® Plus Video Workshop now available
October 14, 2025
Our WUFI® Plus video is available now. Step into WUFI® Plus with this recorded English lectures of our workshop.
The films cover the basics and use of building simulation with WUFI® Plus, as well as the knowledge required to start over. In addition to he presentation, there are so-called "HandsOn" sessions showing the procedure in the software directly. When you purchase the workshop, you will also receive access to the presentations as pdf and other materials.
The following topics are included:
moreRelease WUFI® Pro 7
March 5, 2025
Hygrothermal simulation in a new guise! The new version 7 of the hygrothermal simulation software WUFI® Pro is now available.
The user interface of WUFI® Pro has been completely redesigned to provide you with an even easier and more intuitive operation.
You can find an overview of the new features here: What's new in WUFI® Pro 7.
WUFI® Pro 7 is now available in our online shop.
moreRelease WUFI® Plus und WUFI® Passive 3.5
October 17, 2023
New versions of WUFI® Plus 3.5 and WUFI® Passive 3.5 are now available.
Users of WUFI® Plus 3.x and WUFI® Passive 3.x can download the update free of charge. You can find the corresponding link in your account in our online shop under “My Orders”.
If you buy new, you will receive the new versions directly.
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