Model Inputs
Below is a step-by-step overview of the inputs required for our moisture simulations. All inputs are based on DA07 Criteria for Moisture Control Design Analysis in Buildings, in line with National Construction Code 2022 requirements.
Orientation– the ‘worst-case’ orientation is typically assessed based on its drying potential. This is typically the non-equatorial south facing orientation.
Cavity Ventilation Rate– The Cavity Ventilation Rate impacts the boundary material drying potential. Defaulting 35 ACH to represent a masonry wall system (ventilated at the top and bottom of the wall – every 5th prepend opening), Cavity Ventilation is complicated and should always be conservatively nominated. If unsure, we recommend speaking to a supplier or facade consultant to resolve the ACH value or set it to zero.
Floor Area– The Floor Area (m²) is nominated for the space applicable to the study. This is typically the entire space. For example, within a home, this would be the combined floor area of the entire home.
Floor to Ceiling Height– The Floor to Ceiling Height is used to determine the volume (m³) of the study and the resultant moisture generation rate as per the DA07 intermediate method. It can be assumed to be the average height, where variable heights are within the study.
Surface Resistance– Surface Resistance determines heat transfer coefficients (W/m²) and defaults to HAMT (Modelling) generic values. These are usually lower than those used in System R-value calculations. Typical surface resistances from System R-value calculations can also be adopted as Per System R-value calculation.
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