The Science of Experience



Have You Met WUFI?

Posted by Becky Eades

Jan 6, 2016 12:46:24 PM

Building energy-efficient homes is becoming more and more important as energy costs continue to rise, and non-renewable resources are used up. There are many important considerations to keep in mind as you begin to offer sustainable designs. One of these is heat and moisture transfer rates. In well-insulated buildings, it is important that moisture and heat levels are kept in check. WUFI, a new computer-based model, allows you to simulate heat and moisture transfer rates of buildings.

What is WUFI?


WUFI is a computer simulation program that lets you estimate the likelihood of moisture buildup within the walls, floors, and ceilings of your structure. The models it uses were designed by the Oak Ridge National Laboratory in Tennessee, along with the Franhofer Institute for Building Physics in Germany. WUFI is compatible with a wide array of building materials, making it a very versatile program for use throughout the country.

Comparison to Older Methods

The traditional manner of examining heat and moisture transfer was the Glaser Method, which relied on calculating the dew point in a building. If there was no indication of a dew point, the building was considered safe. These calculations assumed that the building was moving towards a steady state with the environment, which is not the case in most spray foam insulated structures. Therefore, the Glaser Method rated many spray foam insulated methods unsafe, when in fact they were perfectly safe. WUFI does not assume a steady state; it takes building materials into account when making calculations. Therefore, it's a more useful tool for informing on potential moisture issues in energy-efficient buildings.

If you have questions about WUFI or its use in spray foam insulated homes, contact NCFI Polyurethanes. We're as dedicated as you are to building energy-efficient homes.

Topics: Energy Efficiency, InsulStar, Low Costs, NCFI