PVKIT 2.0 Solar Manual

SOLAR MANUAL: PVKIT™ 2.0 SOLAR MANUAL: PVKIT™ 2.0
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S-5!
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| The Right Way™ Copyright 2019 | Solar Manual | PVKIT™ 2.0 | Version 022519
1.4.2.2.1 Dual Component Roof Clips
In a dual component roof clip system, the top component
is attached to the metal roof panel via the seam, and the
bottom component is attached to the building structure.
In order to accommodate differential movement
presented during thermal cycling, the two roof clip
components are joined with a slip joint.
When attaching to this type of standing seam metal roof,
the S-5! clamp can be attached at a roof clip location or
between clips. (See Figure 4).
Note: When using a clamp on a dual component
roof clip it is important the setscrew of the clamp
only engages the top portion of the clip. Should
the setscrew engage the lower portion please see
1.4.2.2.2 Single Component Roof Clips or Halters.
1.4.2.2.2 Single Component Roof
Clips or Halters
In a single component roof clip or halter system, the metal
roof panel can slide freely along the roof clip –
accommodating any differential movement presented during
thermal cycling.
When attaching to this type of standing seam metal roof, the
S-5! clamp must be clear of the roof clip by a minimum of
2” to allow for thermal expansion/contraction movement. An
exception may be permissible when the metal roof panel is
20 feet or less, or when approved by the metal roong
system manufacturer (See Figure 5).
1.4.2.2.3 Locate the Roof Clips
Locating the roof clips can be done in three ways: 1) consulting with the roong system manufacturer or installer; 2)
inspecting the underside of the roof, or 3) close examination of the top side of the roof.
When examining the clip locations from the underside, look for fasteners. As mentioned in Section 1.4.2.2, many
standing seam roong systems are installed on “pre-engineered steel” buildings. The attachment spacing in that industry
is typically 5′-0″ and is observed by inspecting the structural purlins to which the panel clips are attached from the roof
underside (interior of the building).
When examining the clip location from the topside, look for slight deformations of the seam – these will be the clip
locations. Now that the type and locations of the roof clips are known, we can better understand the allowable clamping
locations for the S-5! clamps (per roof clip type).
Figure 5: Single Component Roof Clip
Figure 4: Dual Component Roof Clip
1.4.3 Layout
The rst step in designing the system layout is to map the total usable area for solar array. This can be done by drawing
the total roof area and subtracting the following areas:
• Required re setbacks and pathways. These distances can usually be found by contacting the AHJ or another
qualied professional.
• Required space around any roof obstruction (e.g. skylights, etc.). These distances can usually be found by
contacting the AHJ.
• Any roof zone restrictions per wind loading. A professional engineer can identify these zones.
• Any locations deemed not structurally sound or inappropriate for installation. Again, a professional engineer can
identify these areas.
The next step is to map the standing seams and the roof
clips, as identied in the last section. Then identify the areas
on the seams that are appropriate for attaching the S-5!
PVKIT/Clamp, per the previous section.
Finally, map the module placement. Keep in mind the
module manufacturer’s attachment location and cantilever
restrictions from Section 2.4. Modules in landscape
orientation will generally allow for the most exibility
in design.
Gap Management
Modules in the north/south direction will have a uniform gap
of 1” between each module provided by the PVKIT 2.0
MidGrab. With these module columns, it is also advised to
add a 3.5” gap within a column after a maximum of 10
module sets. (For reference, please see Figure 6 and 7.)
The module gap in the east/west direction will be
managed by the designer. For aesthetic reasons, the
designer may choose to have a minimal gap, uniform
gap, or a gap wide enough to accommodate a walk
space. However, due to thermal cycling concerns, a
minimal gap of ¼” between module columns
is suggested.
For more information on module gaps and pressure
equalization factors please see: Wind Design for
Solar Arrays / SEAOC PV2-2017.
See: https://www.seaoc.org/store/ViewProduct.
aspx?id=10228815
Figure 6
Figure 7