Concern & action: Sufficient ventilation?
Adequate ventilation is needed for the occupants in a building and for the protection of the building fabric in normal circumstances. Some measures can reduce the existing air permeability and make necessary additional ventilation. In addition, Certain activities (e.g. cooking, showering/bathing, drying clothes) create high moisture loads. Appropriate active ventilation system are needed to remove this excess moisture. Otherwise significant localised moisture problems can occur.
Monitor and measure existing room and fabric moisture conditions pre refurbishment. Carry out airtightness test (include open flues) to assess infiltration levels in existing building. Assess existing ventilation provision and weigh up ventilation strategy options post refurbishment to address proposed increased airtightness. Take into consideration household size and occupancy pattern. Establish ventilation strategy to provide adequate ventilation in line with AD Part F, including air provision for occupants in the building and adequate ventilation at points of moisture generation within building (bathroom, kitchen, utility and other wet rooms). Beware of personal preferences that may override optimum system settings Decide on operation strategy and balance the need for good user understanding and automation of the ventilation system. Consider automation may be best for higher risk levels. Consider moisture buffering internal finishes and controls triggered by humidity sensors.
Physically test the installed ventilation system capacity to confirm design criteria given in AD part F is met. Communicate the ventilation strategy to occupants clear and simply and check they understand it. Beware of personal preferences that may override optimum system settings.
Monitor indoor air quality post refurbishment and report results. Monitor room and fabric moisture conditions and report findings. Carry out regular visual checks for damp patches and mould growth in vulnerable areas (kitchen, bathrooms)
Increased Floor airtightness
Energy efficient glazing
High performance doors
Chimney removal complete
Chimney removal internal
Reduced air flow
High efficiency gas-fired condensing boilers
Oil-fired condensing boilers
Micro combined heat and power
Background ventilators and intermittent extract fans
Passive stack ventilation
Passive stack ventilation with heat recovery
Passive stack ventilation with demand control ventilation
RELATED REFERENCES (18)
Tech Paper 6 - Indoor Air Quality and Energy Efficiency in Traditional Buildings (2009)
Halliday, S., (Gaia Research)
Warmer Bath: A guide to improving the energy efficiency of traditional homes in the city of Bath (2011)
Bath Preservation Trust & Centre for Sustainable Energy
The Performance of Traditional Buildings: the SPAB Building Performance Survey 2013 (2013)
Rye, C, Scott C & Hubbard, D.
Improving Energy Efficiency in Traditional Buildings
Future Fit: Installation Phase in depth findings (2011)
Will drivers for home energy efficiency harm occupant health? (2010)
Bone, A., Murray, V. Myers, I., Dengel, A. and Crump, D.
Guidelines to avoid mould growth in buildings, Advanced Buildings Energy Research, 3, pp. 221-236. (2009)
Altamirano-Medina H., Mumovic D., Davies M., Ridley I. and Oreszczyn T.
Conversion of Traditional Buildings Part 2 - sections 3 Enviroment & 6 Energy (2007)
Ed. Dennis Urquhart, Historic Scotland
Insulating pitched roofs at rafter level/warm roofs (2012)
Insulating pitched roofs at ceiling level/cold roofs (2012)
Insulating flat roofs (2012)
Insulating thatched roofs (2012)
Insulating dormer windows (2012)