1441 W 17th St - Plan - Laserfiche WebLink

Home Browse Search

ACCEPTANCE CRITERIA FOR PROPRIETARY ATTACHMENT SYSTEMS OF PHOTOVOLTAIC (PV) ARRAYS TO ROOF ASSEMBLIES (AC467) Page 3 of 4 2.1.4 Field Preparation: A description of the methods of roof membrane preparation, field-cutting, trimming or forming of the tie-down and cap and treatment of cut edges, shall be included in the installation instructions. 2.2 Testing Laboratories: Testing laboratories shall comply with Section 2.0 of the ICC-ES Acceptance Criteria for Test Reports (AC85) and Section 4.2 of the ICC-ES Rules of Procedure for Evaluation Reports. 2.3 Test Reports: Test reports shall comply with AC85. 2.4 Product Sampling: Sampling of the proprietary connector plates and fasteners, tie-downs and caps used for tests under this criteria shall comply with Section 3.2 of AC85. 2.5 Qualification Test Plan: A qualification test plan shall be submitted to and approved by ICC-ES staff prior to any testing being conducted. 3.0 TEST AND PERFORMANCE REQUIREMENTS 3.1 General: The capacity of the proprietary attachment system to resist uplift and lateral loads shall be evaluated in accordance with Section 3.2 , 3.3 and 3.4 of this criteria. 3.2 Connection Capacities: The capacity of the attachment system components to the roof assembly must be determined in accordance with the applicable code provisions. For connections that cannot be designed in accordance with the code, the capacity of the connection must be established by testing under this criteria section. 3.2.1 A test plan for each type of connection and for each type of test to be performed on that connection shall be created. The test plan shall be a complete document and shall include: specimen configuration; test setup; drawings, sketches, free body diagram (load path diagram); a description of the test methods; load application rate; sampling methodology; and the service limit states associated with static displacement of the connection. 3.2.2 For all tests, the roof covering system used in the test assemblies must be code-complying and addressed in an ICC-ES evaluation report. 3.2.3 Test specimens shall consist of components installed in accordance with the manufacturer’s installation instructions. Consideration should also be given to the roof covering system installation. For connections that rely on the PV mounting system connected to the tie-down that is heat welded to the roof membrane, the test assembly shall include the PV mounting system component(s) or bracket that connects to the tie-down, the tie-down and cap heat welded to the roof membrane, roof membrane mechanical attachment plate with the fastener attached to the roof deck. For connections that rely on the connection of the PV mounting system connected to the proprietary connector plates which are mechanical fastened to the roof deck, the test assembly must include the PV mounting system component(s) or bracket that connects to the proprietary connector plates with fasteners attached to the roof deck. If evaluation of systems which include above the deck insulation is sought, the test assembly must include foam plastic insulation conforming to a nationally recognized standard, an ICC-ES acceptance criteria, or an ICC-ES evaluation report at the maximum thickness of insulation desired. 3.2.4 The specimen shall be loaded such that the load is applied with reference to the intended application of the connection. 3.2.5 The load shall be applied at a maximum rate of 0.1 inch (2.5 mm) per minute or a constant rate of applied load of 500 pounds (2 kN) per minute. The method and rate of loading shall be reported with the test data. 3.2.6 The load measuring device shall be capable of measuring the applied load to within ±1 percent and shall be calibrated in accordance with ASTM E4. 3.2.7 As a minimum, a series of five identical tests shall be performed for each load direction and connection assembly configuration, provided the deviation of any individual test result from the average values does not exceed ±15 percent. If the deviation of any single test from the average ultimate value exceeds ±15 percent, then the lowest value shall be selected. 3.2.8 Load-deflection characteristics of the connection shall be determined. Load-deflection curves shall be developed which depict the relative movement between the connected metal bracket and the point of attachment to the roof assembly in the direction of the applied load. 3.2.9 The allowable capacity of the attachment system shall be based on: 3.2.9.1 The average ultimate load of the tested assembly divided by a safety factor of five (5) when the deviation of any individual test result from the average does not exceed 15 percent. 3.2.9.2 The minimum recorded ultimate load of the tested assembly divided by a safety factor of five (5) when the deviation of any individual test result from the average exceeds 15 percent. 3.3 Durability of Connection: 3.3.1 Metal Components: Metal components such as plates, fasteners, etc. must be made from corrosion- resistant metal. 3.3.2 TPO or PVC Caps and Tie-Downs: The caps and tie-downs must be made from single-ply material complying with ASTM D6878 (TPO) or ASTM D4434 (PVC) which is addressed in an ICC-ES evaluation report. 3.3.3 Heat-Welded TPO or PVC Caps and Tie Downs to TPO or PVC roof covering: The durability of the heat-welded tie-down and cap to the roof membrane shall be determined by conducting seam strength tests before (control) and after heat aging. The retained seam strength value shall not be less than 90 percent of the control value. The following tests shall be conducted: 3.3.3.1 TPO material: The seam strength testing must be conducted on five (5) control and five (5) aged specimens in accordance with Section 7.12 of ASTM D6878. Heat aging shall comply with Section 7.9 of ASTM D6878-13. The seam of the test specimens must be made by heat-welding the TPO material in a manner representative of the roof membrane manufacturer’s recommended practices. 3.3.3.2 PVC material: The seam strength testing must be conducted on five (5) control and five (5) aged 1441 W 17th St - 101115926 & 20180369 11/16/2023