Roof Mount Design Assistant™

Notice:

Please enter a project name. Then select
a module manufacturer and a module model.

PROJECT INFO


MODULE



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Please verify your module dimensions. If you notice any discrepancies, please contact our support team at support@ironridge.com or 1-800-227-9523.

SUBARRAYS

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--.- sq ft (EW:--.- x NS:--.-)


MOUNTING




Setting Up A Subarray

To set up a subarray, first select the number of Modules (E-W) you are mounting in the first row. For each row in the subarray with the same number of Modules enter that number under the Rows heading. For example, if your site requires 4 rows of 10 panels each, then enter "10" under "Columns" and "4" under "Rows". Next, select the orientation of the Modules (either Portrait or Landscape). To add a new subarray, simply click the "Add New Subarray" button at the bottom left corner.

Note: This configurator is for quotation purposes only and may not be used to determine physical layouts. If you have additional questions, please contact IronRidge Sales at sales@ironridge.com.

Wind Exposure Category Definitions

Exposure B: Urban and suburban areas, wooded areas, or other terrain with numerous closely spaced obstructions having the size of single family dwellings.

Exposure C: Open terrain with scattered obstructions having heights generally less than 30 feet. This category includes flat open country, grasslands, and all water surfaces in hurricane prone regions.

Exposure D: Flat, unobstructed areas and water surfaces outside hurricane prone regions. This category includes smooth mud flats, salt flats, and unbroken ice.

*Confirm the Wind Exposure Category by consulting your local building authorities.

Wind Speed

The most common Wind Speed associated with the Zip Code entered for your project location. Confirm wind speed by consulting your local building authorities (3 second gust). Determine the wind speed by consulting your local building authorities. (3 second gust)

Ground Snow Load

The most common Ground Snow Load associated with the Zip Code entered for your project location Confirm snow load by consulting your local building authorities.

Attach Spacing

The desired distance between attachments. This number should be less than the maximum span values shown under the Engineering Information table. Typically for residential installations, the attachment spacing will be 4' to 6', whereas for commercial buildings, the spacing can be as much as 8' to 12'.

As always, IronRidge recommends that you consult with a local structural engineer to make sure that the building can support the desired attachment spacing.

Occupancy Category

Occupancy Category is a category used to determine structural requirements based on occupancy which can range from I to IV. The categories are used to classify buildings and other structures based on occupancy level and nature of use.

Occupancy Category I buildings represent a low hazard to life in the event of failure, while Occupancy Category IV buildings are considered essential facilities. Occupancy categories differ between building codes, so it is important to make sure and specify which building code is assigned to your project.

Our software currently supports Occupancy Category I and II. For building structures of category III and IV, please contact IronRidge Sales at sales@ironridge.com. Please refer to table below for a more detailed definition:


Occupancy
Category
Nature of Occupancy
I. Building and other structures that represent a low hazard to human life in the event of failure, including agricultural, temporary, and minor storage facilities
II. All other structures that aren’t in categories I, III, or IV
III. Building and other structures that represent a substantial hazard to human life in the event of failure including:
  • Covered structures the primary occupancy of which is public assembly with an occupant load of 300.
  • Buildings and other structures with elementary-school, secondary-school, or day-care facilities with an occupant load greater than 250.
  • Buildings and other structures with elementary-school, secondary-school, or day-care facilities with an occupant load greater than 500 for colleges or adult-education facilities.
  • Health-Care facilities with an occupant load of 50 or more resident patients without surgery or emergency-treatment facilities.
  • Jails and detention facilities.
  • Any structure with an occupant load greater than 5,000.
  • Power-generating stations, water-treatment facilities for portable water, waste-water-treatment facilities, and other public-utility facilities not included in Occupancy Category IV.
  • Buildings and other structures not included in Occupancy Category IV containing sufficient quantities of toxic or explosive substances that would be dangerous to the public if released.
IV. Building and other structures designated as essential facilities, including:
  • Hospitals and other health-care facilities with surgery or emergency-treatment facilities.
  • Fire, rescue, and police stations and emergency-vehicle garages.
  • Designated earthquake, hurricane, or other emergency shelters.
  • Designated emergency-preparedness, communication, and operation centers and other facilities required for emergency response
  • Power-generating stations and other public-utility facilities required as emergency-backup facilities for Occupancy Category IV structures.
  • Structures containing highly toxic materials as defined in Section 307 of the 2006 International Building Code.
  • Aviation control towers, air-traffic control centers, and emergency-aircraft hangers.
  • Buildings and other structures with critical national-defense functions.
  • Water-treatment facilities required to maintain water pressure for fire suppression.
Tilt Angle to Ground

Enter the desired tilt angle of the modules relative to the ground. Many roofs have a slight pitch, and our software will take this pitch into account when calculating the desired tilt angle.

Angle to Ground Range

Depending on how far from the edges the rails are mounted, the selected tilt leg will have a range of tilt angles that can be supported.

When the rails are mounted at the very edge of the module, the tilt angle will be at its minimum. When the rails are each attached 15% of the module length from the edges, the tilt angle will be at its maximum.

Engineering Information

The engineering information below is calculated based on the Load Conditions and Building Details.

Note that the engineering data can vary considerably between the different Roof Zones. For more information on how to determine the Roof Zone, please refer to the diagram below:


Rm_roof_zones
Max Downforce at Attachment (lbs)

Maximum compression, perpendicular to the roof slope, acting on a roof at the point of attachment due to the portion of snow load, wind load, module weights and racking weights supported by a specific attachment.

If the Attachment Spacing is reduced to a value smaller than the Max Span, then this value will be scaled down proportionally.

Max Uplift at Attachment (lbs)

Maximum tension, perpendicular to the roof slope, acting on a roof at the point of attachment due to the portion of wind load supported by a specific attachment.

If the Attachment Spacing is reduced to a value smaller than the Max Span, then this value will be scaled down proportionally.

Lateral Reaction at Attachment (lbs)

Average force, parallel to the roof slope, acting on a roof attachment due to the snow load, module weights and racking weights.

If the Attachment Spacing is reduced to a value smaller than the Max Span, then this value will be scaled down proportionally.

Max Downforce at Tilt Leg (lbs)

Maximum compression, perpendicular to the roof slope, acting at the point of attachment to the roof of a tilt leg due to the portion of snow load, wind load, module weights, and racking weights supported by that attachment.

Max Uplift at Tilt Leg (lbs)

Maximum tension, perpendicular to the roof slope, acting at the point of attachment to the roof of a tilt leg due to the portion of wind load supported by that attachment under the maximum 3 second gust.

Allowable Downforce on Tilt Leg (lbs)

The allowable compression the selected standoff can support at the desired tilt angle. If this force is less than the Max Downforce at Tilt Leg, the installer should reduce the attachment spacing or, if possible, select a shorter standoff size.

Allowable Uplift on Tilt Leg (lbs)

The allowable tension the selected standoff can support at the desired tilt angle. If this force is less than the Max Uplift at Tilt Leg, the installer should reduce the attachment spacing or, if possible, select a shorter standoff size.

Total Weight

Total weight of the system including racking and panels

Weight / Attachment

Total weight of the system divided by the total number of attachment points on the roof

Distributed Weight

Total weight of the system divided by the total covered area on the roof

Subarray Information

The below table provides you with the estimated length/quantity for each of the key components by subarray.

Required Rail

The exact length of rail required to fully support the specified number of Panels in each row.

Provided Rail

The rail lengths recommended to be the most optimal rail lengths for each row. Our software algorithm automatically takes into consideration the available rail lengths while minimizing the number of splices and extra rail.

Attach Pts

The number of attachments required based on the attachment spacing that was entered on the Engineering tab. The higher the attachment spacing, the fewer the number of required attachments.

T-Bolts

The T-Bolts may be placed anywhere along the rail without having to slide the bolt from the end of the rail. Simply place into the slot where needed and rotate 90 degrees into place.


Sga_t_bolt
Wire Clips

These Wire Clips provide a quick and easy way to manage your PV cables. Simply click into the top rail slot, insert wires and lock into place.


Sga_wire_clip
End Caps

Put the finishing touches on the ends of your rails. These End Caps easily press on to the ends of the rails providing a finished look and keep the inside of the rail free of dirt, debris and insects.


Sga_end_cap
Integrated Grounding System

The IronRidge Integrated Grounding System bonds solar module frames directly to the mounting rails. This eliminates the need for separate module grounding parts and procedures. Learn more.

When Integrated Grounding is selected, Grounding Lug (RS-GDLG-001) is pre-selected in the Bill of Materials. However, WEEB Grounding Lugs (WEEB-LUG-6.7) may also be used with the Integrated Grounding system as well.
Integrated_grounding_system
Orientation

Orientation is defined as how the rails run relative to the module, not the roof.


Rm_help_orientation
Modules (Columns)

Number of modules running along the rail (regardless of module orientation).

Rows

Number of rows (or repeats) of these designated columns.


Rm_help_rows_columns
Zip Code

Enter the Zip Code for your project location. Our database automatically populates the Wind Speed and Ground Snow Load for the most common values associated with your project location. These values should be confirmed with the local building authorities.

IronRidge FlashFoot

IronRidge FlashFoot is an all-in-one flashing and attachment product for composition shingle roofs.

By selecting FlashFoot, Design Assistant automatically removes standoffs and L-feet from your bill of materials and factors-in the FlashFoot's loading capabilities into the Engineering Validation section. More info.

Rm_help_flashfoot

Risk Category

Solar array support systems (like IronRidge) are designed using Risk Category I (this is the same as “Occupancy Category I” from ASCE 7-05). Risk Category I refers to, “buildings or other structures with a low hazard to human life in the event of failure.”

Solar arrays are considered Risk Category I because they are only cladding upon an existing structure, and the structural failure of the solar array is considered to have “low hazard to human life.”

If you are attempting to calculate the impact of the solar array on the building structure, you should consult a structural engineer. These types of calculations are beyond the capability of Design Assistant.

Rail & Component Finishes

All XR Rails have an anodized finish.

“Clear” finish has a silver appearance. Only XR100 is available with a Black finish.

“Mill” means there is no coating on the parts. Mill finish has a silver appearance.

The XR Rail Family

XR Rails are the backbone of the solar array. All three options feature IronRidge’s signature curved profile, providing both an attractive appearance and increased performance.

Each XR Rail size supports specific design loads and max spans, while minimizing material costs.

Select between the different XR Rail options to see the impact on project cost.

Integrated Grounding System

The IronRidge Integrated Grounding System bonds solar module frames directly to the mounting rails. This eliminates the need for separate module grounding parts and procedures. Learn more.

When Integrated Grounding is selected, Design Assistant automatically provides Grounding Mid Clamps, Grounding Straps and T-bolt Grounding Lugs in the Bill of Materials.

WEEB Grounding Lugs (WEEB-LUG-6.7) may also be used with the Integrated Grounding system.

ASCE Code 7-10

Design Assistant automatically calculates design loads based on ASCE 7-10.

ASCE 7-10 is the most up-to-date structural code in the United States, and is the basis for all structural provisions in the 2012 International Building Code (IBC).

Ground Snow Load

The most common Ground Snow Load (ASCE 7-10) associated with the Zip Code entered.

Attach Spacing

The distance between roof attachments. This number should be less than the maximum span value listed for your selected XR Rail within the "Rails" section.

Typical residential installations have attachment spacing between 4' and 8', whereas commercial installations have spacing as high as 12'.

Consult with a structural engineer or your local building authority to confirm the allowable attachment spacing for your array.

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