Innovative building materials are being used in building envelopes for reducing their heating and cooling needs. This paper aims to assess the thermal impact of using lightweight concrete in Lebanese building constructions by pouring an 8 cm thickness of lightweight concrete on the roof and the slab and replacing traditional hollow concrete block by lightweight concrete blocks. Thermal properties of two different samples were experimentally determined: the first one (558 kg/m³) used for the roof and the slab and the second one (1074 kg/m³) used for the walls. Then numerical simulations were carried out for a Lebanese traditional detached house using the characteristics of these two samples. The thermally improved Light Weight Concrete building (LWC) was compared to a traditional Lebanese house base case (BC) using a dynamic building energy simulation tool in the four different Lebanese climate zones: coastal, mid-mountain, mountain, and inland zones. The results highlight the effectiveness of integrating LWC to building envelopes by reducing energy consumption and improving thermal comfort in both winter and summer climate conditions and in the different Lebanese climatic zones. The paper demonstrates that the use of LWC in the vertical walls replacing the traditional hollow blocks can reduce the heating needs by up to 9% and by up to 13% for cooling needs. On the other hand, adding a LWC roof screed has a very high impact on cooling and heating energy consumption, which can reach up to 74% in cooling energy savings and up to 24% in heating energy savings.

创新的建筑材料被用于建筑围护结构，以减少它们的供暖和制冷需求。本文旨在通过在屋顶和楼板上浇筑 8 厘米厚的轻质混凝土并用轻质混凝土砌块代替传统的空心混凝土砌块来评估在黎巴嫩建筑结构中使用轻质混凝土的热影响。通过实验确定了两种不同样品的热性能：第一种样品 (558 kg/m ³ ) 用于屋顶和楼板，第二种样品(1074 kg/m ³) 用于墙壁。然后利用这两个样本的特性对黎巴嫩传统独立屋进行了数值模拟。在四个不同的黎巴嫩气候区：沿海、中山、山区和内陆地区，使用动态建筑能源模拟工具将经过热改进的轻质混凝土建筑 (LWC) 与传统的黎巴嫩房屋基础案例 (BC) 进行了比较。结果突出了通过在冬季和夏季气候条件以及黎巴嫩不同气候区减少能源消耗和提高热舒适性，将 LWC 集成到建筑围护结构中的有效性。该论文表明，在垂直墙壁中使用 LWC 代替传统的空心砌块可以减少高达 9% 的加热需求和高达 13% 的冷却需求。另一方面，