Hea õhupidavus on vältimatult vajalik energiatõhususe, mugava sisekliima ja niiskusturvalise tarindite toimivuse saavutamiseks. Välispiirete õhupidavust iseloomustab õhulekkearv qE50 (m³/(h·m²)). See näitab õhuvooluhulka (m3/h), mis läbib 1 m2 suuruse pindalaga piiret 50 Pa õhurõhkude erinevuse korral.
Hermeetiline on küll õhutihe, gaasitihe, õhu- või gaasitihedalt suletud, kuid tuleb arvestada, et hooned ei ole kunagi sellisel tasemel hermeetilised nagu gaasitorustik või mõni hermeetiline pakend. [4.03.2019]
It is BEMP to maximise the energy efficiency of public buildings and minimise their energy use. This can be achieved by improving the energy performance and integrity of the building envelope (walls, roof and glazing) and increasing the airtightness, as well as installing energy efficient equipment and commissioning the energy systems.
Improving a house's airtightness provides more comfort to the occupants and protectst the building envelope from moisture damage, but it also increases humidity levels inside the house since less water vapour can escape. This can mean an increase of condensation on windows. If a house is tightened to this degree, it will now need more ventilation.
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