Moisture calculation and mould prediction of building construction

Purpose

The constructions used and built must have known properties and functions. Having a moisture and mould simulation performed is an essential part of the theoretical basis needed to demonstrate and verify moisture safety. Calculations can provide a basis for improvements or for screening out poor designs early in the design process.

It is only in the last 15 years that realistic and at the same time user-friendly calculation programs have been available. This means that today's design of structures can contain a more engineering basis. In the past, it was common to use stationary calculations, which could not give very realistic results. 

Today, there are user-friendly calculation programs that can take into account most, but sometimes not all, which is why a deeper understanding of building physics, relevant assumptions of parameters and practical experience of constructions are often required. 

Method

We use the hygrothermal calculation program WUFI (1D or 2D) together with one or more mould models such as WUFI-Bio or the MRD model.

In order to make the calculation as realistic as possible, a detailed description/drawing of the construction or design is needed, and preferably the intended location of the building and type of activity. It is usually an advantage if the maximum permitted moisture condition is available for the constituent products.

We often recommend or apply parametric studies, i.e. taking into account several different conditions, as for example the execution of construction usually varies.

Delivery

The calculation is presented in a calculation report with result diagrams, used parameters and assumptions etc. The result is commented and assessed based on both simulation results and practical experience.