While the polycarbonate panels are used extensively in engineering, a very serious problem has occurred. The polycarbonate canopy roof generally leaks seriously. Some leaks are found immediately after installation, and some leaks after half a year or one or two years. The reason for these problems is that users have little understanding of the characteristics of polycarbonate
panels. Now analyze and solve the problem of water leakage in the roof of the endurance board canopy:
1. Design reasons The physical properties of the polycarbonate are very different from those of glass, aluminum and stone, and its thermal expansion coefficient is about 7 times that of ordinary glass. The joint changes caused by the polycarbonate are much greater than that of ordinary glass or aluminum. Therefore, if the design of thepolycarbonate daylighting roof is directly based on the experience value of the glass roof without calculation, the joints of the polycarbonate will crack and cause water leakage due to the large joint changes.
2. Reasons for installation: Due to the low density of the polycarbonate sheet, its weight is only 1/12-1/15 of the same volume as glass, so it is easy to transport and install, and can reduce the weight of the building, but it is precisely because the endurance board has quality Because of its light weight, the board surface deformation caused by wind load or other external forces should be taken into consideration during installation to avoid deformation and cracking of the sealing joints.
3. Selection of sealant Poor quality or improper selection of sealant is one of the main reasons for the cracking and water leakage of the polycarbonate sheet daylighting roof. For this reason, we have selected several products from several influential companies in the market for testing. Measure the adhesiveness of sealant and polycarbonate for use in future construction.
Through the above analysis of the three objective causes of water leakage in the polycarbonate canopy or daylighting roof, it is not difficult to sum up a technical essential: refer to the thermal expansion and contraction coefficient of the PC endurance board, wind, rain and snow load, etc. for the joint and fix the daylighting roof The treatment, through the use of neutral silicone sealant to seal the joints.
