Cold room insulation joints are the "weak points of thermal resistance," and their sealing directly determines the retention of cold air and energy costs. A common installation issue is poor sealing work, such as inadequately filled sealant or the omission of aluminum foil tape reinforcement. While this may seem to save time during construction, it leads to sealant contraction and cracking in low-temperature environments, resulting in cold air leakage, soaring electricity bills, and long-term losses that far exceed the initial savings.

           Sealant and aluminum foil tape serve a "dual-protection" function. Sealant must completely fill the joint gaps to form a continuous thermal barrier, as incomplete filling leaves small voids. Aluminum foil tape reinforces the sealant, reducing the impact of temperature fluctuations on the seal. In low-temperature operations, where the temperature difference between the inside and outside of the room can exceed 30°C, unreinforced sealant can contract significantly due to thermal expansion and contraction, turning tiny voids into cracks that become "pathways" for cold air leakage.

Cold air leakage triggers a "vicious cycle of energy waste." The refrigeration system must operate continuously under high loads t o compensate for the lost cold air, accelerating wear on components such as the compressor and condenser and increasing the risk of failure. At the same time, electricity consumption rises sharply. According to estimates, air leakage from poorly sealed joints c  an increase cold room electricity costs by 20%–40%. Additionally, cold air leakage can cause temperature fluctuations inside the room, compromising the quality of stored goods and increasing spoilage losses.

Proper joint sealing must follow standardized procedures:

         Use low-temperature-resistant polyurethane sealant, ensuring it is applied evenly and without bubbles to cover all joints completely.

          Once the sealant has cured, immediately apply aluminum foil tape with a thickness of ≥0.08mm symmetrically along the joint center, pressing it firmly without wrinkles.

          For corners and irregular joints, apply additional overlapping tape for enhanced reinforcement.

           After installation, inspect the sealing of all joints to ensure no gaps or weaknesses remain.

          The effectiveness of cold room insulation lies in "30% materials, 70% workmanship." The quality of joint sealing directly determines the overall thermal performance. Investing extra effort in proper sealant application and aluminum foil tape reinforcement during construction may seem to extend the timeline, but it effectively blocks cold air leakage and reduces long-term operational costs. Paying attention to the "small detail" of joint sealing helps build a solid thermal barrier for the cold room, ensuring both energy efficiency and the safety of stored goods.