The new flow chart states that all extract ventilation must be continuous. We’ve
been working to the original flow chart that stated we only need to install continuous
ventilation if there is condensation or mould present. According to the PAS we only
need to install continuous ventilation “if the proposed energy efficiency improvement
measures are either intended to reduce the air permeability of the building envelope
below 5 m3/m2h at 50 Pa or might do so, as existing IEV or PSV as described in
C.2.3 shall then be assessed as inadequate”. Should we just be accepting this and
fitting continuous ventilation in all properties or should we be testing this?