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<br /> ACCEPTANCE CRITERIA FOR PROPRIETARY ATTACHMENT SYSTEMS
<br />OF PHOTOVOLTAIC (PV) ARRAYS TO ROOF ASSEMBLIES (AC467)
<br />
<br />1.0 INTRODUCTION
<br />1.1 Purpose: The purpose of this acceptance criteria is
<br />to establish requirements for proprietary attachment
<br />systems used to attach photovoltaic (PV) arrays to roof
<br />assemblies to be addressed in an ICC Evaluation Service,
<br />LLC (ICC-ES), evaluation report under the 2018, 2015,
<br />2012 and 2009 International Building Code® (IBC). Basis of
<br />evaluation is IBC Section 104.11. The reason for the
<br />development of this criteria is to provide guidelines for the
<br />evaluation of proprietary attachment systems of PV arrays
<br />to roof assemblies, because the codes do not include
<br />specific provisions for attaching the PV arrays to roof
<br />assemblies.
<br />1.2 Scope: This acceptance criteria applies to
<br />proprietary attachment systems used to attach PV arrays
<br />composed of PV modules and PV mounting system
<br />attached to the roof assembly. The scope of the evaluation
<br />is limited to establishing allowable load capacities (uplift
<br />and lateral) to resist wind and seismic forces acting on the
<br />PV modules connected to the PV mounting system. The PV
<br />mounting system is attached to the roof assembly using the
<br />proprietary attachment systems described in the criteria.
<br />The proprietary attachment systems addressed in this
<br />criteria apply to installation on the roof assemblies
<br />consisting of the following:
<br />• Roof decks comprised of wood-based sheathing, steel
<br />or concrete.
<br />• Above the deck insulated and non-insulated roofs.
<br />• Roof covering membranes that are either
<br />thermoplastic polyolefin (TPO) manufactured in accordance
<br />with ASTM D6878 or polyvinyl chloride (PVC)
<br />manufactured in accordance with ASTM D4434,
<br />mechanically or adhesively attached to the roof deck and
<br />comprise of the top layer of the roof assembly.
<br />The proprietary attachment systems are composed of
<br />proprietary connector plates, fasteners and tie-downs and
<br />caps, used together to attach the PV mounting system to
<br />the roof assembly. The proprietary connector plates are
<br />made from metal and are fastened to the roof deck with
<br />fasteners. The tie-downs and caps are made from TPO or
<br />PVC membrane roofing material. The tie-down, cap and
<br />roof membrane should be sourced from the same roof
<br />membrane manufacturer to ensure compatibility and proper
<br />welds. The tie-downs and caps are heat-welded to the roof
<br />covering membrane. When used, the tie-down must be
<br />bolted to the PV mounting system. (See Figure 1). Electrical
<br />safety, grounding provisions and grounding continuity for
<br />the PV modules to the PV mounting system are outside the
<br />scope of this criteria. For PV modules, compliance with
<br />Chapter 15 of the IBC is outside the scope of this criteria.
<br />1.3 Codes and Referenced Standards: Where
<br />standards are referenced in this criteria, these standards
<br />shall be applied consistently with the code upon which
<br />compliance is based.
<br />1.3.1 2021, 2018, 2015, 2012 and 2009 International
<br />Building Code® (IBC), International Code Council.
<br />1.3.2 2021, 2018, 2015, 2012 and 2009 International
<br />Fire Code® (IFC), International Code Council.
<br />1.3.3 ASTM D4434-15 (-12 for the 2018, 2015, 2012
<br />and 2009 IBC), Specification for Poly (Vinyl Chloride) Sheet
<br />Roofing, ASTM International.
<br />1.3.4 ASTM D6878-17 (-13 for the 2018, 2015, 2012
<br />and 2009 IBC), Standard Specification for Thermoplastic
<br />Polyolefin Based Sheet Roofing, ASTM International.
<br />1.3.5 ASTM E4-02, Practices for Force Verification of
<br />Testing Machines, ASTM International.
<br />1.4 Definitions:
<br />1.4.1 Proprietary Connector Plate: Fabricated
<br />metal flat shapes with predrilled holes that come in two
<br />configurations, with and without friction fitted threaded stud.
<br />When used without the threaded stud, the tie-down
<br />component must be used to connect the connector plate to
<br />the PV system, as shown in Figure 1. When used with the
<br />threaded stud, the tie-down component is not required
<br />since the threaded stud of the connector plate fastens
<br />directly to the PV mounting system. Screws are used to
<br />fasten the connector plate to the roof deck.
<br />1.4.2 Fastener: Screws or other mechanical
<br />fasteners conforming to a nationally recognized standard,
<br />an ICC-ES acceptance criteria or an ICC-ES evaluation
<br />report. Examples of fasteners could be lag screws,
<br />mechanical fasteners used with single-ply roof assemblies,
<br />etc.
<br />1.4.3 TPO or PVC Tie-Down: A factory cut or
<br />punched shape made from TPO or PVC roof material which
<br />matches existing roof material specifications and complying
<br />with either ASTM D4434 or ASTM D6878, as applicable.
<br />The tie-down is shaped to fit over the PV mounting system
<br />and is heat-welded to the roof membrane. Holes are
<br />punched in the tie-down, which are used to mechanically
<br />fasten to the PV mounting system.
<br />1.4.4 TPO or PVC Cap: A factory cut or punched
<br />shape made from TPO or PVC roof material which matches
<br />existing roof material specifications complying with ASTM
<br />D4434 or ASTM D6878, as applicable. The cap is heat-
<br />welded to the applicable roof membrane and is installed
<br />above proprietary connector plates or other fasteners.
<br />2.0 BASIC INFORMATION
<br />2.1 General: The following information shall be
<br />submitted:
<br />2.1.1 Product Description: Complete information on
<br />all components used in the proprietary attachment system,
<br />including material description, specifications, protective
<br />coatings, fasteners, and the manufacturing processes.
<br />2.1.2 Installation Instructions: A copy of the
<br />installation instructions.
<br />2.1.3 Packaging and Identification: A description of
<br />the method of packaging and field identification of the
<br />components of the proprietary attachment system. Product
<br />identification shall be in accordance with the product
<br />identification provisions of the ICC-ES Rules of Procedure
<br />for Evaluation Reports, and shall include the product
<br />identification number and the ICC-ES evaluation report
<br />number.
<br />1441 W 17th St - 101115926 &
<br />20180369
<br />11/16/2023
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