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5 . Installation of Roof Attachments and QRails <br /> The roof attachments are attached to the roof structure and support the QRails. The permissible distance between the roof <br /> fasteners depends on several factors and must be calculated specifically for each project, e.g. with the QDesign Tool. Roof <br /> attachments are available for a wide variety of roof types. In many cases, additional items may be required to accomplish <br /> flashing or other weather sealing. Suitable products are available from a number of sources. It is the responsibility of the <br /> installer to select the appropriate products and to install them correctly. <br /> 5.1 Select QRait Configuration <br /> Standard Rail Configuration <br /> Image 5.1.1 shows a typical standard rail configuration. In this configuration, a row <br /> of modules is supported by two rails under each row of modules. In areas with <br /> exceptionally high snow loads it may be necessary to support the modules with three <br /> rails. <br /> Shared Rail Configuration <br /> The rail design of the QRail system allows the use of shared <br /> configurations for the Standard and Heavy rails with standard mid and <br /> Image 5.1.1 <br /> end clamps. In this configuration, a single rail supports two rows of Two-rail configuration <br /> modules as shown in Image 5.1.2. Shared rails may be used for both <br /> landscape and portrait array configurations. <br /> Modified Shared Rail Configuration <br /> Modified shared rail configuration is a hybrid of standard and <br /> shared rail configurations . The first and last rail are set back <br /> from the end of the modules in standard module clamping <br /> zones to provide additional adjustability while the remaining <br /> rails are in shared rail configuration. This configuration <br /> maintains the benefits of shared rail configuration using the <br /> Image 5.1.2 <br /> same clamps, 25% less rails, and full array bonding. May be Shared rail configuration <br /> used for both landscape and portrait module orientations. <br /> NOTE! <br /> When selecting QRail configuration, insure <br /> the modules have the appropriate ratings <br /> for the project site conditions in the selected <br /> configuration. Check the module installation <br /> manual to determine if the clamping area falls <br /> within the acceptable range for the project <br /> design loads. Image 5.1.3 <br /> Modified shared rail configuration <br /> Precise rail positioning and alignment is critical <br /> when installing shared rail systems. Roof <br /> attachments which are adjustable in the N-S <br /> direction are recommended when installing <br /> shared rail systems. <br /> B1 7.2.3-46 17 Jul-2019, Rev 4.2 <br />