planning:airtight_construction:general_principles:principles_for_improving_airtightness
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planning:airtight_construction:general_principles:principles_for_improving_airtightness [2011/06/06 15:38] – aespenberger | planning:airtight_construction:general_principles:principles_for_improving_airtightness [2015/09/14 15:30] (current) – [Multimedia] wfeist | ||
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+ | ====== General principles for improving airtightness====== | ||
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+ | ===== Key Principle ===== | ||
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+ | The key principle for planning the airtightness of a building is that of the " | ||
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+ | |{{ : | ||
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+ | It is essential that only a **single** airtight layer is planned and implemented. Two “nearly” airtight layers will serve no purpose – leakage will still take place! This can be visualised, for example, by a leakage in the entrance door of a house, where a leaking door in the lobby won’t remedy the problem, or two buckets, both with a hole in the bottom; if one is placed inside the other, this won’t stop the water from leaking out! | ||
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+ | It is essential that the concept for airtightness is designed and applied for the **long term**. The Passive House Institute studied the concepts which guarantee lasting airtightness within the framework of a IEA research project; a brief summary of the main results can be found {{: | ||
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+ | ===== Airtight construction is not a question of the construction method ===== | ||
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+ | Built examples of Passive Houses in solid, timber and pre-fabricated component constructions, | ||
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+ | In all certificates of the Passive House Institute for building envelope solutions the airtightness concept and the specific solutions for joints are being reviewed, too. | ||
+ | ===== Planning stages for airtightness: | ||
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+ | - ** For each external building component, the component which will form the airtight layer should be specified** (e.g. the OSB board or sheeting in a roof construction, | ||
+ | - **As a second step, it must be specified how the ends of the airtight component layers will be permanently and airtightly joined**. Attention: it is not enough to “connect” the window frame to the brick wall, for example, (because the wall level is not airtight!). | ||
+ | - **Thirdly, any necessary penetrations must be planned **: electric cables and pipelines which pass through the basement ceiling, power sockets (!) in external walls, etc.. Today suitable tried and tested solutions and materials are available for this purpose. | ||
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+ | // | ||
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+ | ** Insulation materials are generally NOT air tight** (exception: foam glas panels), therefore the airtight envelope must be designed and built separately. | ||
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+ | Passive House architects are experts in the planning of connection details. Manufacturers provide suitable products for appropriately airtight external building components. | ||
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+ | ====== Multimedia ====== | ||
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+ | {{youtube> | ||
+ | Video on insulation and airtightness | ||
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