防水透氣膜的防風效果

防水透氣膜的防風效果

windproof effect of house wrap

澳大利亞CSR機構的建筑科學團隊研究表明防水透氣膜可以通過減少空氣滲透率來提高建筑物防風效果。

并且澳大利亞政府的建筑科學研究機構意識到建筑物的防風性能是建造房屋時需要解決的一個重要的問題。

澳大利亞政府網站www.yourhome.gov.au（Chris Reardon 2013）報告說“建筑物的防風性能是房屋節能保溫方面面臨的最大的問題：傳統的典型建筑在冬季，會有大量的暖空氣逸出，外部的冷空氣進入; 在夏天，恰恰相反。“

根據建筑科學公司網站（John Straube 2012）的說法，“解決建筑的防風問題是建筑圍護結構中第二重要的工作。除了雨水外，通過墻壁，屋頂和地板的潮濕氣體也會對房屋的耐久性產生極大的破壞。不受控制的氣流穿過外墻不僅會將濕氣帶入房屋結構內，導致霉菌和腐爛，而且它還浪費了很大一部分房屋的保溫性能，并可能導致室內空氣質量變差。

    坐落在悉尼西部的澳大利亞CSR機構進行的測試表明安裝防水透氣膜可以減少高達 82%的. 空氣滲透率。

澳大利亞CSR機構建筑科學家Jesse Clarke說：“作為我們研究建筑物能源效率的一部分，我們用了一個實驗來證明空氣滲透對典型建筑物的節能影響”。在實驗中，我們在壓力實驗室表面建造90mm的木質墻體。測試墻體有兩個固定的窗戶，用玻璃棉作保溫層，10mm 石膏板，木材踢腳板和楣梁，一個電源點和一個燈開關。在沒有防水透氣膜的初始測試之后，在用防水透氣膜包裹。同樣的測試程序反復的測試表明使用防水透氣膜的測試結果和這個數據（安裝防水透氣膜可以減少高達 82%的空氣滲透率）是非常相似的。克拉克說：“正確使用和安裝防水透氣膜可以有效起到防風效果，在提高能源效率方面發揮著非常重要的作用。防水透氣膜不僅對建筑物的節能保溫起著重要作用，而且還能限制潮濕空氣通過墻壁進入建筑物，更能起到對建筑物墻壁防雨和防水的作用，甚至在大風的情況下。使用防水透氣膜會大大提高建筑物的耐久性。

克拉克得出結論是：“根據建筑物的類型，建筑物的氣密性，保溫層的性能以及建筑物所在的氣候區，來選擇適合的防水透氣膜對于確保建筑物的節能保溫和耐久性起著至關重要作用”。

New study by CSR’s （Corporate Social Responsibility ）Building Science team demonstrates wall wrap can significantly improve the energy efficiency of home by reducing air infiltration.

Air infiltration and air leakage has been identified by The Building Science Corporation and the Australian Government as an important issue that needs to be addressed when building a home.

The Australian Government website www.yourhome.gov.au (Chris Reardon 2013) reports “air leaks are year-round issues: in winter, they allow valuable warm air to escape and unwanted external cold air to enter; in summer, the reverse occurs.”

According to the Building Science Corporation website (John Straube 2012) “Stopping air is the second most important job of a building enclosure.  Next to rain, air leaks through walls, roofs, and floors can have the most damaging effect on the durability of a house.  Uncontrolled airflow through the shell not only carries moisture into framing cavities, causing mould and rot, but it also can account for a huge portion of a home’s energy use and can cause indoor-air-quality problems.”

Testing carried out at the CSR Research Centre in Western Sydney demonstrated that installing wall wrap can reduce air infiltration by up to 82%. 

CSR Building Scientist Jesse Clarke explained, “As part of our research into energy efficiency, we designed an experiment to determine the impact of air infiltration through a typical residential wall”.For the experiment, a 90mm timber stud wall was built on the face of a pressure chamber.  The test wall had two fixed windows, glass wool insulation, 10mm gyprock, timber skirting & architraves, one power point and one light switch.  After an initial test with no wall wrap, the wall was wrapped with Wall Wrap.  The same testing procedure was repeated using house wrap with very similar results.Clarke says, “Properly installed and well-sealed air barrier wall wraps play a critical role in improving energy efficiency by restricting uncontrolled air leakage.  Not only are there benefits to the energy performance, but durability is improved by restricting humid air migrating into walls as well as more effective weatherproofing and drainage of wall systems, even in high wind scenarios.”

Clarke concluded, “Depending on the type of building construction, the air tightness and insulation levels of the building, and its climate zone, the selection of the right wall wrap is critical to ensure the energy efficiency and durability of a home”.