QRail Installation

BI 7.2.3-46
Jul-2019, Rev 4.2
17
BI 7.2.3-46
NOTE!
When selecting QRail configuration, insure
the modules have the appropriate ratings
for the project site conditions in the selected
configuration. Check the module installation
manual to determine if the clamping area falls
within the acceptable range for the project
design loads.
Precise rail positioning and alignment is critical
when installing shared rail systems. Roof
attachments which are adjustable in the N-S
direction are recommended when installing
shared rail systems.
5. Installation of Roof Attachments and QRails
The roof attachments are attached to the roof structure and support the QRails. The permissible distance between the roof
fasteners depends on several factors and must be calculated specifically for each project, e.g. with the QDesign Tool. Roof
attachments are available for a wide variety of roof types. In many cases, additional items may be required to accomplish
flashing or other weather sealing. Suitable products are available from a number of sources. It is the responsibility of the
installer to select the appropriate products and to install them correctly.
5.1 Select QRail Configuration
Image 5.1.1 shows a typical standard rail configuration. In this configuration, a row
of modules is supported by two rails under each row of modules. In areas with
exceptionally high snow loads it may be necessary to support the modules with three
rails.
Standard Rail Configuration
The rail design of the QRail system allows the use of shared
configurations for the Standard and Heavy rails with standard mid and
end clamps. In this configuration, a single rail supports two rows of
modules as shown in Image 5.1.2. Shared rails may be used for both
landscape and portrait array configurations.
Shared Rail Configuration
Image 5.1.1
Two-rail configuration
Image 5.1.2
Shared rail configuration
Image 5.1.3
Modified shared rail configuration
Modified shared rail configuration is a hybrid of standard and
shared rail configurations . The first and last rail are set back
from the end of the modules in standard module clamping
zones to provide additional adjustability while the remaining
rails are in shared rail configuration. This configuration
maintains the benefits of shared rail configuration using the
same clamps, 25% less rails, and full array bonding. May be
used for both landscape and portrait module orientations.
Modified Shared Rail Configuration