![]() ![]() It is therefore essential to use well-insulated window frames with multiple lip packing. The entire window, ie: glazing and frame, should have a U-value of 0.80W/(m²K) or less (this value may have to be more stringent in more extreme climates, whereas milder climates may manage to meet the criteria with higher U-values) and the installed window should have a total U-value of no more than 0.85 W/(m²K). A Passive House’s airtightness must be demonstrated with a pressure test wherein the allowable air change cannot exceed 0.6 times a room’s volume per hour and the pressure differential is limited to 50 Pascals. AirtightnessĪ superiorly airtight building will ensure favourable ventilation and temperatures while preventing moisture damage. The more compact the building envelope, the easier and more cost-efficient it is to reach the Passive House Standard. For free standing, single family homes, these U-values are often under 0.10 W/(m²K). All opaque building components should be so well-insulated that their heat transfer coefficients (U-values) do not exceed 0.15W/(m²K), meaning that no more than 0.15 watts of heat energy are lost though the external envelope per degree Kelvin and square meter. Edges, corners, connections and penetrations must be planned with special care in order to avoid thermal bridges. Compact buildings with good thermal protectionĪll components making up the building envelope must be well insulated. The methods remain the same but the details have to be adapted. Instead, the design of each Passive House building must be adapted to the particular climate in which it will be built, meaning that these criteria may sometimes be more or less difficult to fulfil. Remember: Passive House criteria are not climate dependent. While the Passive House Institute is currently working on a set of climate zone specific guidelines for various components (see Passipedia for more information on windows, for example), the following can be used as a general basis and adjusted where needed. ![]() Experience has proven, however, that the Passive House Standard works well in a wide variety of climates both hot and cold, mild and extreme. The following are guidelines based on the implementation of the Passive House Standard in cool, moderate climates similar to those of Central Europe where the Standard was first developed. ![]()
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