Experimental Research on Wind Resistance， Air Permeability， and Watertightness of Standing Seam Metal Roof Photovoltaic Systems

Standing seam metal roof photovoltaic systems have been widely used in steel structures due to their lightweight and high-strength properties， environmental friendliness， cost-effectiveness， and aesthetic appeal. However， the lack of corresponding design and construction standards has posed challenges in practical applications. Based on a case study of a standing seam metal roof photovoltaic system project project， experimental research was conducted to investigate its wind resistance， watertightness， and air permeability. The results showed that when the test wind pressure was within 3.5 kPa， no residual deformation occurred in the photovoltaic panels， metal plates， fixtures， or supports of the standing seam metal roof photovoltaic system. However， when the test wind pressure was increased to 4.2 kPa and maintained for 23 seconds， the photovoltaic panel detached from the edge photovoltaic fixture， resulting in test failed. The wind uplift resistance test results of the system was thus determined to be at the 3.5 kPa level. The actual wind uplift resistance of the entire system can meet the design requirements and possesses a certain degree of safety redundancy. Both watertightness and airtightness have achieved the highest grades specified in the Test Method of Air Permeability， Watertightness， Wind Load Resistance Performance for Curtain Walls （GB/T 15227-2019）， namely Grade 4 and Grade 5， respectively. The test results meet the design requirements.