30 Sep '15, 11am

Old Buildings and Ventilation by Roger Hunt

Ventilation is vital in old buildings. This may seem strange when so much emphasis is placed on making the building envelope airtight but, in the past, open fires and gaps in the structure meant that a large quantity of air was pulled into and through the interior which is one of the reasons that old buildings didn’t become damp. Poor ventilation harms not only the building’s health but that of its occupants. Lack of ventilation increases the relative humidity (RH) - the amount of water vapour in the air relative to the maximum amount that can exist at that temperature. This leads to condensation and, in turn, mould growth. Insufficient ventilation also results in poor internal air quality, as contaminants from people, pets and emissions from things such as building materials, furniture, paints and cleaning products are trapped. In modern homes it’s recommended that 40 per...

Full article: http://www.greenspec.co.uk/building-design/ventilation-ol...

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