<![CDATA[ Lightweight bricks are materials used in the construction of building walls, produced through a mixture of cement, water, and sand. In several cases that occur in buildings, especially regarding indoor heat, the spaces become less comfortable to occupy. This study aims to determine the effect of curing duration on heat insulation. A full factorial method was applied in the experimental design, with curing durations of 19, 25, 26, 32, and 39 days for heat insulation testing, and 19 and 27 days for sound insulation testing. The GSP Temperature and Humidity Data Logger GSP6 was used for data collection. The results of this study showed that the best specimen for heat insulation was at a curing duration of 32 days, with an average test result of 29.35 °C, while the lowest performance was found in specimens with a curing duration of 26 days, with a value of 31.4 °C. These results indicate that lightweight bricks cured for 32 days provide the most effective thermal insulation for rooms and buildings]]>
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