In this research, 558 family timber-frame houses newly built in the period of 2006–2019 in the Czech Republic were assessed in terms of their airtightness. The air leakage through the building envelope was evaluated via the ‘blower-door’ method, and the most important parameters affecting the airtightness of these types of buildings were simultaneously evaluated. In low-energy houses with natural ventilation, the mean air change rate at a pressure difference of 50 Pa (ACH50) was ascertained as 1.03 h⁻¹, and in low-energy houses with mechanical ventilation and heat recovery, the average ACH50 value was 1.07 h⁻¹. Passive houses had an average ACH50 value of 0.44 h⁻¹. The positive effects of mandatory regulations and government subsidies were demonstrated. The ACH50 values improved with each new year of construction; this trend was especially evident for low-energy houses. A very significant influence was also found from the company conducting the construction and the construction technology being employed; an on-site construction method achieved lower ACH50 values than a method based on panel construction with a higher degree of prefabrication. The ACH50 values were also affected by the presence of a chimney and/or type of the interior airtight vapour barrier. In particular, a brick chimney body impaired the ACH50 values. Timber-frame houses with a vapour-permeable air barrier systems generally had smaller air leakage rate values than houses with a polyethylene vapour barrier. However, neither the internal building volume nor the envelope area were found to be significant parameters in terms of airtightness for the lightweight timber-frame residential houses.

在这项研究中，评估了捷克共和国在2006–2019年期间新建的558套家庭用木结构房屋的气密性。通过“吹气门”方法评估通过建筑物围护结构的空气泄漏，同时评估影响这些类型建筑物的气密性的最重要参数。在自然通风的低能耗房屋中，压差为50 Pa（ACH50）时的平均空气变化率确定为1.03 h ^-1，在机械通风和热回收的低能耗房屋中，平均ACH50值为1.07小时^-1。被动房的平均ACH50值为0.44 h ^-1。证明了强制性法规和政府补贴的积极作用。ACH50值随着每个新的建设年份而提高；对于低能耗房屋，这种趋势尤为明显。进行施工的公司和所采用的施工技术也产生了很大的影响。与基于预制程度更高的面板构造的方法相比，现场构造方法的ACH50值更低。ACH50值还受到烟囱的存在和/或内部气密性蒸汽屏障的类型的影响。特别是，砖烟囱主体会破坏ACH50值。具有蒸气可渗透的空气屏障系统的木结构房屋通常比具有聚乙烯蒸气屏障的房屋具有较小的漏气率值。然而，