Given the high moisture level of mortar and plaster, condensation is a problem that can appear in any new house. Inhabiting and heating a house causes materials to dry out and release water vapour. Additional water vapour is released into the home's living area as a byproduct of everyday activities, including showering, cooking, washing and drying clothes, or boiling kettles.

Roofshield's patented Spunbond Meltblown Spunbond (SMS) structure allows high levels of airflow in addition to the transport of moisture vapour, rendering the formation of condensation extremely unlikely. This contrasts sharply with most air and vapour-permeable underlays, which rely on an airtight VP film layer to accomplish their intended functionality