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Home My WebLink AboutFLASHLOC DUO GUIDE - 21-00715 - 336 Salem Ave - Solar PanelsDESIGN & ENGINEERING GUIDE Table of Contents Getting Started – Introduction 1 Installer Responsibility 2 Tools and Specifications 3 Test and Data Results 4 Rules and Guidelines 5 Limitations for Spans 6 Appendix A: Thermal Expansion Getting Started This manual is for professional engineers, designers, installers, and permitting authorities. For assistance with your array’s engineeringand a Bill of Materials, see our U-builder at https://design.unirac.com/ The Flashloc Duo attachmentis designed to be used with the Unirac SOLARMOUNT Flush-to-Roof system. Some of the featuresof this product include: •Designed per the ASCE 7-10 and ASCE 7-16 BuildingCode •Component testing •Rigorous EngineeringAnalysis •Ability to be attachedboth to a rafter or directly to roof sheathingthat meets the requirementsoutlinedin this document •Flashloc triple seal technology which saves time, preserves the roof, and protects the penetration •Kitted with two rafter screws, sealant, and rail attachment hardware for maximum convenience •Compatible with comp shingle and rolled comp roofs Installer Responsibility & Disclaimer Please review this guide and the SOLARMOUNT Installation Guide thoroughly before installing your SOLARMOUNT system. These guides provide supporting documentation for building permit applications, planning, and assembling the SOLARMOUNT system. The installer is solely responsible for: •Complying with all applicable local or national building codes, including code requirements that can be more stringent than the guidelines set forth in this manual; •Maintaining and enforcing all aspects of a safe working environment; •Ensuring that Unirac and other products are appropriate for the particular installation and the installation environment; •Ensuring that the roof, its rafters, connections, and any other structural support members can support the array under all code level loading conditions (this total building assembly is referred to as the building structure); •Using only Unirac parts and installer-supplied parts as specified by Unirac (substitution of parts may void the warranty and invalidate the letters of certification in all Unirac publications); •Ensuring that attachment strength is adequate to support loads in your installation location •Ensuring the attachment of the roof deck to the rafters is adequate to support all loads when attaching to sheathing (See Expedited Permit Process at https://www.dvrpc.org/solar/pdf/Structural_Commentary_for_the_National_Simplified_Residential_Roof_Photovoltaic_Array_Permi t_Guidelines_2017-06-03.pdf; •Maintaining the waterproof integrity of the roof, including selection and proper installation of appropriate flashing techniques, if required; •Ensuring safe installation of all electrical aspects of the PV array, including proper grounding/bonding; •Array shading and output analysis; •Ensuring correct and appropriate design parameters are used in determining the design loading used for design of the specific installation. Parameters, such as snow loading, wind speed, exposure and topographic factor should be confirmed with the local building official or a licensed professional engineer; •Comply with module manufacturer's specifications. Unirac shall not be liable for any losses, damages, or injuries that directly or indirectly result from any non-conformance with the above TECHNICALSPECIFICATIONS: MaterialTypes: A380 diecast aluminum Seals: InjectionmoldedEPDM Hardware: 300 series stainlesssteel Bondingand Grounding: See SOLARMOUNTD&E GUIDE TOOLS REQUIREDOR RECOMMEND FOR LAYOUT, ATTACHMENTS, ANDINSTALLATION: •Drill (Do Not Usean Impact Driver) •5/16” Socket •Torque Wrench •Tape Measure •Chalk Reel GENERALHARDWARE: •#12-14 x 2.5” Hex Head, Self-drilling, Screws SAFETY: All applicable OSHA safety guidelines should be observed when working on a PV installation job site. The installation and handling of PV solar modules, electrical installation and PV racking systems involves handling components with potentially sharp metal edges. Rules regarding the use of glovesand other personal protectiveequipmentshouldbe observed. Detail drawings available for basic geometry at Unirac.com TEST DATA: WoodTypes for sheathingattachedsystems: •24/16 APA rated 7/16” OSB, •32/24 APA rated 15/32” Plywood Test Setup: •Performedon sheathingthicknessesper IRC 2018. •Performedwith the farthest upslope screw in a 1/8” gap between sheathingpanels. •Included rail and clampconnections, meaning allowableloadscover entire racking system •Applies only when rails are mountedparallel to eave and ridge •Assumeall installationrequirementsare followedcorrectly TESTS RESULTS: •OSB •Allowable load in Uplift = 135 lbs •Allowable load in Downforce = 124 lbs •Allowable load in Shear = 82 lbs •Allowable load in Lateral = 102 lbs •Plywood •Allowable load in Uplift = 166 lbs •Allowable load in Downforce = 170 lbs •Allowable load in Shear = 127 lbs •Allowable load in Lateral = 140 lbs •Rafter •Allowable load in Uplift = 495 lbs •Allowable load in Downforce = 907 lbs •Allowable load in Shear = 190 lbs •Allowable load in Lateral = 488 lbs Spans are calculated such that the point loads on the roof will not exceed these allowable loads. INSTALLATION MUST BE IN ACCORDANCEWITH UNIRAC’SFLASHLOC DUO INSTALLATIONMANUAL SHEATHING MOUNT: Flashloc Duo attachment has provisions for 6 wood screws. It is mandatory to drive 6 wood screws when attachment is attached only to sheathing. Reference spans in state certification letters for sheathing-only attachment. Span tables are valid only for east-west rail orientation (eave-to-ridge rafter orientation). RAFTER MOUNT: Insert 2 wood screws instead of 6 when attachment is installed on Rafter. Reference spans in state certification letters for Rafter mount. Span tables are valid only for east-westrail orientation(eave-to-ridgerafter orientation). COMBINATION OF DECK & RAFTER MOUNT: Drive 6 wood screws for attachment installed on deck and drive 2 wood screws for attachment installed in rafters. For spans, consider average of deck mountspan and rafter mount span. For this method, it is required that at least half of the mountsare installedin a rafter. LANDSCAPEORIENTATION: When mounting modules in landscape orientation, confirm short side clamping is allowed by module manufacturer, account for module manufacturerpressure derating. MAXIMUMCANTILEVER: 1/3 span THERMAL EXPANSION: The maximumlength of continuouslyspliced rail is limiteddue to thermal expansion.For thermalexpansionrules, see Appendix A. RAIL DIRECTION: Rails must be mountedparallel to the eave and ridge of the roof. THERMAL BREAKS Thermal breaks prevent failure of rails, rail/splice connections, attachments or system failure due to thermal expansion or contraction. Determine location of thermal breaks prior to installation of attachments and rails. To create a thermal break, set gap between rails that is sufficient for proper installation of end clamps and tooling to achieve required torque, or 0.5” minimum. A thermal break is required when a continuous length of spliced rails exceeds the length, in feet, shown in the following tables. For additional concerns on thermal breaks in your specific project, pleaseconsult a licensed structural engineer. A thermal break must not be spanned by a PV module. Installing a module over a thermal break would defeat the goal of a thermal break and could result in damage to the array. The values displayed are the maximum allowed, spliced rail length, in feet, without a thermal break. These values do not include cantilever. These values apply only to Flashloc Duo. The installer is responsible for determining the maximum temperature difference (ΔT) used to establish the maximum spliced rail length, without a thermal break, at the install location. ∆T refers to the maximum difference in the temperature of the rail during installation and the extreme high or low temperature of the install location. The temperature at the time of install may be measured using an infrared thermometer. If determining ∆T by measurement of the rail temperature with an infrared thermometer, be sure to follow instructions of the temperature measurement device, as some devices do not work properly on reflective surfaces, such as the mill finish rail. Alternatively, if the rail temperature at the time of install cannot be measured, ∆T is the difference between the extreme high and the extreme low for your location.The Extreme Annual DesignConditionstable at the followingURL can be used as a reference when determining∆T. http://ashrae-meteo.info/ OSB Sheathing Maximum Continuous Spliced Rail Length (ft.) Solarmount Standard Solarmount Light Attachment Span Attachment Span ∆T (°F) 12" 24” 36" 48" 60" > 60" 12" 24” 36" 48" 60" > 60" 0-40 35 50 63 76 84 84 31 42 57 60 75 78 40-50 33 46 57 67 67 67 27 38 51 60 65 66 50-60 29 42 51 56 56 56 25 38 45 52 55 56 60-70 27 38 48 48 48 48 23 34 39 48 48 48 70-80 25 38 42 42 42 42 21 30 39 42 42 42 80-90 25 34 37 37 37 37 21 30 37 37 37 37 90-100 23 34 34 34 34 34 19 30 33 34 34 34 100-120 23 31 31 31 31 31 19 26 31 31 31 31 120-140 21 28 28 28 28 28 19 26 28 28 28 28 These lengths for OSB sheathing-attached systems were determined by limiting the deflection of the rail to protect against screw pullout from the sheathing and failure of the rail splice. Interpolation is not allowed. If your span falls between published values, use the next smaller span to determine rail length. Plywood Sheathing Maximum Continuous Spliced Rail Length (ft.) Solarmount Standard Solarmount Light Attachment Span Attachment Span ∆T (°F) 12" 24” 36" 48" 60" > 60" 12" 24” 36" 48" 60" > 60" 0-40 33 46 57 60 65 78 29 38 45 52 55 66 40-50 29 42 51 52 65 66 25 34 39 44 55 54 50-60 27 38 45 52 55 54 23 30 39 44 45 54 60-70 25 34 39 44 48 48 21 30 33 36 45 42 70-80 23 30 39 42 42 42 19 26 33 36 35 42 80-90 21 30 33 36 37 37 19 26 33 36 35 37 90-100 21 26 33 34 34 34 17 22 27 28 34 34 100-120 19 26 31 31 31 31 17 22 27 28 31 30 120-140 19 26 27 28 28 28 15 22 27 28 28 28 These lengths for plywood sheathing-attached systems were determined by limiting the deflection of the rail to protect against screw pullout from the sheathing and failure of the rail splice. Interpolation is not allowed. If your span falls between published values, use the next smaller span to determinerail length. Rafter Maximum Continuous Spliced Rail Length (ft.) Solarmount Standard Solarmount Light Attachment Span Attachment Span ∆T (°F) 24" 48" 72" 24" 48" 72" 0-40 75 102 129 67 94 105 40-50 67 94 117 59 78 93 50-60 63 86 105 55 70 93 60-70 55 78 93 51 70 81 70-80 51 70 93 47 62 81 80-90 51 70 81 43 62 69 90-100 47 62 81 39 54 69 100-120 43 62 69 35 54 57 120-140 39 54 69 35 46 57 These lengths for rafter-attached systems were determined by limiting the deflection of the rail to protect against screw pullout from the sheathing and failure of the rail splice. Interpolation is not allowed. If your span falls between published values, use the next smaller span to determine rail length.