NULGMLP1 Nxt Umount Flush To Roof Instructions

NULGMLP1 Nxt Umount Flush To Roof

Product Information

Specifications

• Model: NXT UMOUNT Rail
• Attachment Options: Stronghold Attachment, Flashkit Pro Attachment, DTD BUTYL ATT Rafter Connection
• Material: Aluminum
• Maximum Reaction Force: Varies based on attachment spacing and rail length

Product Usage Instructions

1. Installer Responsibility
   Before installation, ensure to confirm parameters such as snow loading, wind speed, exposure, and topographic factors with a local building official or licensed professional engineer. Non-conformance with these parameters may result in liability for losses, damages, or injuries.

2. Design Methodology
   Refer to the design methodology provided in the guide for proper installation and structural integrity.

3. Rail Spans and Joints
   Consult Figures 1 and 2 in the guide for information on rail spans, cantilevers, splice joints, and expansion joints.

4. Maximum Continuous Spliced Rail Lengths
   Refer to the tables in the guide for the maximum continuous spliced rail lengths based on the specific attachment spacing and attachment type being used.

5. Attachment Instructions
   Follow the guidelines provided in the guide for attaching the rails securely using the specified screws, washers, and attachment methods.

Frequently Asked Questions (FAQ)

• Q: What is the maximum allowable spliced rail length for NXT UMOUNT Rail with Stronghold Attachment?
  A: The maximum allowable spliced rail length varies based on attachment spacing and ranges from 34ft to 66ft with corresponding maximum reaction forces.

• Q: How should I ensure that the maximum reaction forces do not exceed the shear capacity of the roof connection?
  A: It is the designer’s responsibility to calculate and verify that the maximum reaction forces generated by the rails do not exceed the shear capacity of the roof connection. Refer to the provided tables for guidance.

Getting Started

• This guide is for professional engineers, designers, installers, and permitting authorities. This guide provides design rules and limitations, connection strengths, and maximum allowable span tables. For assistance with project design and a Bill of Materials, see our U-builder at https://design.unirac.com/.
• NXT UMOUNT Flush-to-Roof is an extruded aluminum rail system that is engineered to hold most framed solar modules to a roof structure and installed parallel to the planar roof surface.

Some of the features of this product include:

• Integrated system grounding and bonding to UL 2703
• Fully Structural Internal Rail Splice with integrated bonding
• Combination module mid clamp and end clamp with integrated bonding
• System ground wire lug and MLPE mounting clamp with integrated bonding
• Accommodates landscape or portrait module orientations with rail parallel or perpendicular to roof slope
• Compatible with most framed modules with a thickness of 30-40mm
• In-Rail and accessory wire management options
• Designed per the ASCE 7-10 and ASCE 7-16 Building Code
• Mechanical and electrical component testing
• Rigorous engineering analysis
• Superior aesthetics
• Optional end caps

Installer Responsibility & Disclaimer

Please review this guide and the NXT UMOUNT Installation Guide thoroughly before installing your NXT UMOUNT system. These guides provide supporting documentation for building permit applications, planning, and assembling the 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 guide;
• Maintaining and enforcing all aspects of a safe working environment;
• Ensuring safe installation of all electrical aspects of the PV array, including proper grounding/bonding;
• Array shading and output analysis;
• Comply with module manufacturer’s specification;
• 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 Unirac and other products are appropriate for the installation and the installation environment;
• Ensuring that the supporting 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);
• Ensuring the attachment to the roof structure is adequate to support loads in your installation location;
• Maintaining the waterproof integrity of the roof, including selection and proper installation of appropriate flashing techniques, if required;
• Ensuring correct and appropriate design parameters are used in determining the design loading used for the design of the specific installation. Parameters, such as snow loading, wind speed, exposure, and topographic factors should be confirmed with the local building official or a licensed professional engineer.

Unirac shall not be liable for any losses, damages, or injuries that directly or indirectly result from any non-conformance with the above.

Design Methodology

The NXT UMOUNT system was designed based on and complies with the following codes and specifications:

1. Minimum Design Loads for Buildings and Other Structures, ASCE/SEI 7-05, ASCE/SEI 7-10, ASCE/SEI 7-16.
2. 2006-2018 International Building Code, by International Code Council, Inc. w/ Provisions from SEAOC PV-2 2017.
3. 2006-2018 International Residential Code, by International Code Council, Inc. w/ Provisions from SEAOC PV-2 2017.
4. AC428, Acceptance Criteria for Modular Framing Systems Used to Support Photovoltaic (PV) Panels, November 1, 2012 by ICC-ES.
5. 2015 Aluminum Design Manual, by The Aluminum Association, 2015.

Note

• The online U-Builder is highly recommended for all qualifying projects. It will provide you with a Bill of Materials, Certification Letter, and Calculations for your project., including maximum allowable rail spans and rail attachment reaction forces on the supporting structure. https://design.unirac.com/.
• Maximum allowable rail spans are provided in Appendix H of this guide. Values in span tables are based on the same engineering methodology and calculation algorithms used for U-Builder and are provided here for reference.

APPENDIX

Rail Spans, Cantilevers, and Splice Joints

• Each row of modules is mounted on at least 2 parallel rails and can be oriented up-slope (high profile mode) or cross-slope (low profile mode), with modules oriented in portrait or landscape. Modules should be placed such that they overhang the rails symmetrically. Module rows may require mounting on 3 parallel rails to increase spans and/or reduce loads on module clamps.
• A rail span is the distance between adjacent rail attachments (see Appendix F). Maximum allowable rail spans depend on site-specific design loads or local code requirements. For maximum allowable spans, reference span tables in this guide or the Ubuilder online design tool at https://design.unirac.com/. Rail attachment reaction forces on the supporting structure are provided by the Ubuilder. It is the installer’s responsibility to ensure that the supporting structure and the attachment to the roof structure are adequate to support site-specific design loads. The American Wood Counsel provides resources for determining lag bolt connection capacities.
• A rail cantilever is the length of rail extending past the first or last attachment in a row of modules, unsupported at one end. The maximum rail cantilever length is 1/3 of the adjacent span.
• A rail splice joint is an assembly where the ends of 2 rails are joined to form a continuous run of rail. The splice bar is centered over the joint where rail ends meet. The joint is secured with 4 bolts (2 per rail) through the splice bar and into the rails. The splice provides electrical bonding continuity across the splice, alignment of rails, and structural continuity across the splice joint. NXT UMOUNT Splices can be installed anywhere within a span. Splice joints can be spanned by a PV module, and can be installed at the same location as an attachment, and module clamps can be installed at splice locations.

Thermal Expansion Breaks

• Thermal expansion breaks are separations between continuous spliced rail lengths to prevent failure of rails, rail/splice connections, attachments, or system failure due to thermal expansion or contraction.
• Determine the location of thermal breaks before the installation of rail attachments. The separation gap between rails must be 0.5” minimum or sufficient for proper installation of modules. A thermal break must not be spanned by a PV module. Installing a module over a thermal break would defeat its goal and could result in damage to the array.
• Rails in expansion joint configurations are cantilevered and must follow the cantilever rule on both sides of the expansion joint, which states that the maximum rail cantilever distance is 1/3 of the adjacent span.

Allowable Spliced Rail Lengths
Maximum allowable continuous spliced rail lengths before a thermal expansion break are given in the following tables. These values do not include a cantilever. These values apply only to the NXT UMOUNT System. The installer is responsible for determining the maximum temperature difference (∆T) used to establish maximum spliced rail lengths at the install location. ∆T is the maximum difference in the measured temperature of the rail during installation and the extremely high or low temperature of the installation location. Alternately, ∆T is the difference between the extreme high and the extreme low for your location. The Extreme Annual Design Conditions table at the following URL can be used as a reference when determining ∆T. http://ashrae- meteo.info/

CAUTION:
As spans increase, so does the maximum reaction force that rails can exert on roof connections. It’s the designer’s responsibility to ensure that Maximum Reaction Forces do not exceed the shear capacity of the roof connection. See the tables below for corresponding reaction forces.

Maximum Continuous Spliced Rail Length for NXT UMOUNT Rail with Stronghold Attachment (ft.)/Maximum Reaction Force (lbs)

| Attachment Spacing
---|---
∆T| 24″| 48″| 72″
40| 66 / 153| 92 / 214| 114 / 265
50| 58 / 168| 84 / 244| 102 / 296
60| 54 / 188| 76 / 265| 90 / 314
70| 50 / 203| 68 / 276| 78 / 317
80| 46 / 214| 60 / 279| 78 / 363
90| 42 / 219| 60 / 314| 66 / 345
100| 42 / 244| 52 / 302| 64 / 372
120| 38 / 265| 52 / 363| 53 / 369
140| 34 / 276| 44 / 358| 45 / 366

Maximum Continuous Spliced Rail Length for NXT UMOUNT Rail with Flashkit Pro Attachment (ft.)/Maximum Reaction Force (lbs)

| Attachment Spacing
---|---
∆T| 24″| 48″| 72″
40| 74 / 137| 100 / 185| 126 / 233
50| 66 / 153| 92 / 213| 114 / 264
60| 62 / 172| 84 / 233| 102 / 284
70| 54 / 175| 76 / 246| 90 / 292
80| 50 / 185| 68 / 252| 90 / 334
90| 50 / 208| 68 / 299| 78 / 325
100| 46 / 213| 60 / 278| 78 / 362
120| 42 / 233| 60 / 334| 66 / 367
140| 38 / 246| 52 / 337| 57 / 370

• STRONGHOLD BUTYL ATTACHMENT WITH #12-14 SCREW, HWH, SS SELF-DR W/ #12 EPDM WASHER
• STRONGHOLD BUTYL ATTACHMENT WITH #14-14 SCREW X 3.0 TYPE AB, W/ #14 EPDM WASHER

Maximum Continuous Spliced Rail Length for NXT UMOUNT Rail with DTD BUTYL ATT Rafter Connection (ft.)/Maximum Reaction Force (lbs)

| Attachment Spacing
---|---
ΔT| 24″| 48″| 72″
40| 54 / 188| 76 / 264| 90 / 313
50| 50 / 217| 68 / 296| 78 / 339
60| 46 / 240| 60 / 313| 78 / 407
70| 42 / 256| 52 / 317| 66 / 402
80| 38 / 264| 52 / 362| 60 / 418
90| 34 / 266| 44 / 364| 54 / 423
100| 34 / 296| 44 / 383| 48 / 418
120| 30 / 313| 40 / 418| 40 / 418
140| 26 / 317| 34 / 414| 34 / 414

Maximum Continuous Spliced Rail Length for NXT UMOUNT Rail with DTD BUTYL ATT Rafter Connection (ft.)/Maximum Reaction Force (lbs)

| Attachment Spacing
---|---
∆T| 24″| 48″| 72″
40| 58 / 179| 84 / 260| 102 / 316
50| 54 / 209| 68 / 263| 90 / 348
60| 46 / 213| 68 / 316| 78 / 362
70| 42 / 227| 60 / 325| 66 / 358
80| 42 / 260| 52 / 322| 66 / 409
90| 38 / 265| 52 / 382| 60 / 418
100| 34 / 263| 52 / 403| 54 / 418
120| 34 / 316| 44 / 409| 45 / 418
140| 30 / 325| 36 / 390| 39 / 423

STRONGHOLD BUTYL ATTACHMENT AS DECK ATTACHMENT ON OSB

Maximum Continuous Spliced Rail Length For NXT on OSB (ft.)

Attachment Spacing
ΔT| 12″| 24″| 36″| 48″| 60″| > 60″
40| 31| 42| 57| 60| 75| 78
50| 27| 38| 51| 60| 65| 66
60| 25| 38| 45| 52| 55| 56
70| 23| 34| 39| 48| 48| 48
80| 21| 30| 39| 42| 42| 42
90| 21| 30| 37| 37| 37| 37
100| 19| 30| 33| 34| 34| 34
120| 19| 26| 28| 28| 28| 28
140| 17| 24| 24| 24| 24| 24

STRONGHOLD BUTYL ATTACHMENT AS DECK ATTACHMENT ON PLYWOOD

Maximum Continuous Spliced Rail Length for NXT on Plywood (ft.)

Attachment Spacing
ΔT| 12″| 24″| 36″| 48″| 60″| > 60″
40| 29| 38| 45| 52| 55| 66
50| 25| 34| 39| 44| 55| 54
60| 23| 30| 39| 44| 45| 54
70| 21| 30| 33| 36| 45| 42
80| 19| 26| 33| 36| 35| 42
90| 19| 26| 33| 36| 35| 37
100| 17| 22| 27| 28| 34| 34
120| 15| 22| 27| 28| 28| 28
140| 15| 18| 21| 24| 24| 24

NXT UMOUNT Rail Properties

Material:
6000 Series Aluminum Alloys Ultimate Tensile: 38 ksi, Yield: 35 ksi Finish: Mill or Dark Anodized

RAIL PROPERTIES

Module Clamp Connection Strength – COMBO CLAMPS ONLY
Values in the following table are demand load limitations per module and apply for 2-rail configurations, where modules are secured by 4 clamps. For 3-rail configurations, where modules are secured by 6 clamps, multiple tabulated values by 1.5.

Module Condition Definitions:

• END-END: The END-END module shown above, correlating with the loads below, indicates a module that is secured by 4 end clamps on 2 rails.
• END-MID/MID-END: The END-MID and MID-END modules shown above, correlating with the loads below, indicate modules that are secured by 2 End clamps and 2 Mid clamps on 2 rails.
• MID-MID: The MID-MID module shown above, correlating with the loads below, indicates a module that is properly secured by 4 Mid clamps on 2 rails.

NXT UMOUNT Combo Clamp Load Limits per Module

Load Direction| Allowable Load (lbs)| Design Load (lbs)
End-End| Mid-End| Mid-Mid| End-End| Mid-End| Mid-Mid
Z+, Tension| 2796| 2308| 1820| 4228| 3491| 2754
Y±, Transverse| 652| 862| 1072| 988| 1306| 1624
X±, Sliding| 504| 846| 1188| 760| 1278| 1796

Module Clamp Connection Strength – COMBINATION OF COMBO CLAMP AND HIDDEN END CLAMP
Values in the following table are demand load limitations per module and apply for 2-rail configurations, where modules are secured by 4 clamps. For 3-rail configurations, where modules are secured by 6 clamps, multiple tabulated values by 1.5.

Module Condition Definitions: Combination of Combo Clamp (as Mid) and Hidden End Clamp (as End)

• END-END: The END-END module shown above, correlating with the loads below, indicates a module that is secured by 4 end clamps on 2 rails.
• END-MID/MID-END: The END-MID and MID-END modules shown above, correlating with the loads below, indicate modules that are secured by 2 End clamps and 2 Mid clamps on 2 rails.
• MID-MID: The MID-MID module shown above, correlating with the loads below, indicates a module that is properly secured by 4 Mid clamps on 2 rails.

NXT UMOUNT Combination Combo Clamp + Hidden End Clamp Load Limits per Module

Load Direction| Allowable Load (lbs)| Design Load (lbs)
End-End| Mid-End| Mid-Mid| End-End| Mid-End| Mid-Mid
Z+, Tension| 1844| 1832| 1820| 2792| 2773| 2754
Y±, Transverse| 776| 854| 1072| 1172| 1292| 1624
X±, Sliding| 990| 398| 1188| 1496| 600| 1796

STRONGHOLD, FLASHKIT PRO, and L-FOOT Rail Attachment Connection Strength
Rail Attachments connect the rail to the supporting roof structure using a Rail Clamp and L-foot. Values in the following table apply to the Stronghold Attachment kit, Stronghold Rail Clamp with Flashkit PRO, and Stronghold Rail Clamp with Unirac Standard L-foot. Rail Clamps may be installed on either side of the Stronghold L-foot. See table for L-foot oriented in Y+ and Y- directions.

NXT UMOUNT Rail Attachment Connection Strength per Attachment

Load Direction| X±| Y+| Y-| Z +| Z-
Average Ultimate Load [lbs]| 954.0| 615.1| 668.5| 2080.4| 2151.8
Design Load [lbs]| 564.8| 360.4| 435.2| 1315.6| 1395.4
Resistance factor Φ| 0.6| 0.6| 0.7| 0.6| 0.6
Allowable Load [lbs]| 373.4| 238.3| 287.7| 869.8| 922.5
Safety Factor Ω| 2.6| 2.6| 2.3| 2.4| 2.3

SOLARHOOKS Rail Attachment Connection Strength
Values in the following table apply to the Stronghold Rail Clamp with SolarHooks for systems installed on tile roofs. Rail Clamps must be installed on the serration side of the Solarhooks.

AT1 SolarHooks with NXT UMOUNT Rail Attachment Connection Strength per Attachment|
---|---
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 627| 478| 833| 476
Design Load [lbs]| 371| 296| 516| –
Resistance factor Φ| 0.6| 0.619| 0.619| –
Allowable Load [lbs]| 242| 196| 341| 317
Safety Factor Ω| 2.6| 2.443| 2.442| 1.5
CT1 SolarHooks with NXT UMOUNT Rail Attachment Connection Strength per Attachment|
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 294| 541| 926| 476
Design Load [lbs]| 173.9| 362| 623| –
Resistance factor Φ| 0.6| 0.669| 0.673| –
Allowable Load [lbs]| 113| 239| 412| 317
Safety Factor Ω| 2.6| 2.260| 2.247| 1.5
CT2 SolarHooks with NXT UMOUNT Rail Attachment Connection Strength per Attachment|
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 256| 542| 848| 476
Design Load [lbs]| 151.1| 369| 556| –
Resistance factor Φ| 0.6| 0.681| 0.656| –
Allowable Load [lbs]| 98| 244| 368| 317
Safety Factor Ω| 2.6| 2.222| 2.306| 1.5
CT5 SolarHooks with NXT UMOUNT Rail Attachment Connection Strength per Attachment|
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 155| 447| 1575| 476
Design Load [lbs]| 114| 268| 995| –
Resistance factor Φ| 0.733| 0.601| 0.632| –
Allowable Load [lbs]| 75| 177| 658| 317
Safety Factor Ω| 2.063| 2.518| 2.394| 1.5

FLASHLOC DUO Rail Attachment Connection Strength
Values in the following table apply to the Stronghold Rail Clamp with FLASHLOC DUO for systems installed on compatible roofing materials and only with Unirac-supplied wood screws. Flashloc DUO may be secured to rafters with the provided 2 wood screws or to roof sheathing with 6 wood screws. Rail Clamps must be installed on the serration side of the attachment with the sealant port on the up-slope side. Refer to the Unirac Flashloc DUO Installation Guide and Design and Engineering Guide to complete instructions. For rafter attachment, the installer is responsible for ensuring the attachment to the roof structure is adequate to support loads in your installation location. Tested wood types for sheathing attached systems:

• 24/16 APA rated 7/16” OSB
• 32/24 APA rated 15/32” Plywood

FLASHLOC DUO with NXT UMOUNT Rail Attachment Connection Strength per Attachment

FLASHLOC DUO for Rafter Mounting|
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 248| 473| 1089| 1076
Design Load [lbs]| 164| 289| 693| 688
Resistance factor Φ| 0.7| 0.6| 0.6| 0.6
Allowable Load [lbs]| 108| 191| 458| 455
Safety Factor Ω| 2.3| 2.5| 2.4| 2.4
FLASHLOC DUO for 15/32” Plywood Sheathing Mounting
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 420| 298| 498| 425
Design Load [lbs]| –| 192| –| –
Resistance factor Φ| –| 0.65| –| –
Allowable Load [lbs]| 140| 127| 166| 170
Safety Factor Ω| 3| 2.35| 3| 2.5
FLASHLOC DUO for 7/16” OSB Sheathing Mounting
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 307| 248| 406| 312
Design Load [lbs]| –| 124| –| –
Resistance factor Φ| –| 0.5| –| –
Allowable Load [lbs]| 102| 82| 135| 124
Safety Factor Ω| 3| 3.03| 3| 2.5

STRONGHOLD ATTACHMENT WITH BUTYL Connection Strength
Values in the following table apply to the Stronghold Rail Clamp with STRONGHOLD ATTACHMENT WITH BUTYL for systems installed on compatible roofing materials and only with Unirac-supplied wood screws. STRONGHOLD ATTACHMENT WITH BUTYL may be secured to rafters with the provided 2 wood screws or to roof sheathing with 6 wood screws. Rail Clamps must be installed on the serration side of the attachment. Refer to the Unirac NXT UMOUNT Installation Guide and Design and Engineering Guide to complete instructions. For rafter attachment, the installer is responsible for ensuring the attachment to the roof structure is adequate to support loads in your installation location. Tested wood types for sheathing attached systems:

• 24/16 APA rated 7/16” OSB
• 32/24 APA rated 15/32” Plywood

STRONGHOLD ATT W/BUTYL and STRONGHOLD Rail Clamp with NXT UMOUNT Rail Connection Strength per Attachment

STRONGHOLD ATT W/BUTYL for Rafter Mounting using #12 screw|
Load Direction| X±| Y-| Y+| Z +| Z-
Average Ultimate Load [lbs]| 168| 566| 733| 1604| 2206
Design Load [lbs]| –| 387| 484| –| 1501
Resistance factor Φ| –| 0.682| 0.661| –| 0.68
Allowable Load [lbs]| 117| 256| 320| 535| 992
Safety Factor Ω| 1.45| 2.2| 2.289| 3| 2.2
STRONGHOLD ATT W/BUTYL for 15/32” Plywood Sheathing Mounting using #12 screw
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 420| 298| 498| 425
Design Load [lbs]| –| 192| –| –
Resistance factor Φ| –| 0.65| –| –
Allowable Load [lbs]| 140| 127| 166| 170
Safety Factor Ω| 3| 2.35| 3| 2.5
STRONGHOLD ATT W/BUTYL for 7/16” OSB Sheathing Mounting using #12 screw
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 307| 248| 406| 312
Design Load [lbs]| –| 124| –| –
Resistance factor Φ| –| 0.5| –| –
Allowable Load [lbs]| 102| 82| 135| 124
Safety Factor Ω| 3| 3.03| 3| 2.5

STRONGHOLD ATTACHMENT WITH BUTYL Connection Strength
Values in the following table apply to the Stronghold Rail Clamp with STRONGHOLD ATTACHMENT WITH BUTYL for systems installed on compatible roofing materials and only with Unirac-supplied wood screws. STRONGHOLD ATTACHMENT WITH BUTYL may be secured to rafters with the provided 2 wood screws or to roof sheathing with 6 wood screws. Rail Clamps must be installed on the serration side of the attachment. Refer to the Unirac NXT UMOUNT Installation Guide and Design and Engineering Guide to complete instructions. For rafter attachment, the installer is responsible for ensuring the attachment to the roof structure is adequate to support loads in your installation location. Tested wood types for sheathing attached systems:

• 24/16 APA rated 7/16” OSB
• 32/24 APA rated 15/32” Plywood

STRONGHOLD ATT W/BUTYL and STRONGHOLD Rail Clamp with NXT UMOUNT Rail Connection Strength per Attachment

STRONGHOLD ATT W/BUTYL for Rafter Mounting using #14 screw|
Load Direction| X±| Y-| Y+| Z +| Z-
Average Ultimate Load [lbs]| 168| 566| 733| 2336| 2206
Design Load [lbs]| –| 387| 484| –| 1501
Resistance factor Φ| –| 0.682| 0.661| –| 0.68
Allowable Load [lbs]| 117| 256| 320| 779| 992
Safety Factor Ω| 1.45| 2.2| 2.289| 3| 2.2
STRONGHOLD ATT W/BUTYL for 15/32” Plywood Sheathing Mounting using #14 screw
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 420| 298| 498| 425
Design Load [lbs]| –| 192| –| –
Resistance factor Φ| –| 0.65| –| –
Allowable Load [lbs]| 140| 127| 166| 170
Safety Factor Ω| 3| 2.35| 3| 2.5
STRONGHOLD ATT W/BUTYL for 7/16” OSB Sheathing Mounting using #14 screw
Load Direction| X±| Y+| Z +| Z-
Average Ultimate Load [lbs]| 307| 248| 406| 312
Design Load [lbs]| –| 124| –| –
Resistance factor Φ| –| 0.5| –| –
Allowable Load [lbs]| 102| 82| 135| 124
Safety Factor Ω| 3| 3.03| 3| 2.5

Design Criteria for Span Tables:
Values in the maximum allowable rail span tables provided herein are subject to the following general criteria and additional criteria shown on individual span tables sheets. Values in span tables are based on the same engineering methodology and calculation algorithms used for U-Builder and are provided here for reference.

• Building Assumptions
  • Building Risk Category I, II, or III per criteria shown on individual span tables sheets
  • Mean Roof Height = 0 – 60 ft per criteria shown on individual span table sheets
  • Roof Pitch: 0°-45°
  • Site Elevation: 0 ft
• Wind Design Assumptions
  • Exposure Category B, C, or D
  • Basic Wind Speed = 90 – 180 mph
  • Level terrain. Topographic factor, kzt = 1.0
  • γE = 1.0 for ‘Interior’ spans, γE = 1.5 for ‘Exposed’ spans (ASCE 7-16 Sec. 29.4.3, Fig. 29.4-7)
• Snow Design Assumptions
  • Ground Snow Load = 0-70 psf
  • Exposure Factor = 1.0
  • Thermal Factor = 1.0
  • Results based on uniform snow load
• Seismic Design Assumptions
  • 0.2-s Spectral Response Acceleration, SS ≤ 3
  • Seismic site class A, B, C, or D
• Array Assumptions
  • Total array dead load: 3 psf
  • Module orientation and Rail direction per criteria shown on individual span tables sheets.
  • Maximum module dimensions of 40.1” x 67” or 41” x 80” for 60-cell or 72-cell module types, respectively.
  • The minimum distance between modules and the roof edge is at least twice the module height above the roof surface.
  • Modules are parallel to a roof surface and the maximum height above the roof surface is 5” to 10” depending on the attachment type.
  • Gaps between module rows and columns are 0.5”.
  • ‘Exposed’ spans as defined in ASCE 7-16 sec. 29.4.4 shall be used when any part of an exposed module or panel is attributed to that span.
  • The most restrictive of all roof zone spans shall be used when any part of the module is attributed to that span.

References

• ASHRAE climatic design conditions 2009/2013/2017/2021
• Ubuilder 2.0

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