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SFSystem Planning andAssembly Installation Manual SUNPOWER
<br />2. Installing the lowest row ofstandoffs, L-feet and rail:
<br />Intallstandoffs with flashing directly onto high profile morini
<br />material (tile or shake) or low profile roofing material (asphalt
<br />shingles or sheet metal). L-feet must be flush with or above the ·
<br />highest point of the roof surface.
<br />Install the first row of standoffs at the lower edge of the
<br />installation area. Ensure standoffs are aligned by using a chalk
<br />line. (A SF Sys[em rail can also be used as a straight edge.)
<br />SF System Rail
<br />Drill a pilot hole through roof into the center of the rafter at
<br />each standofflag screw hole location. Many types and brands
<br />of flashings can be used with the SF System. SunPower offers a
<br />Oatey® «No-Calk" flashings for iu steel standoffs and Oatey®
<br />or SunPower flashings for its aluminum two-piece standoffs.
<br />Fasten the standoffto the roof with the lag icrews. Position
<br />and attach the L- foot with respect to the lower edge of the roo f
<br />as illustrated in Figure 3.
<br />Cut the rails to your array width, being sure to keep rail slots
<br />free of roofing grit or other debris. If your installation requires
<br />splices, assemble them prior to attaching L-feet (see 'Footing
<br />and splicing requirements," below, and "Material planning for
<br />rails and cap strips," p. 7). Slide the '/8-inch mounting bolts
<br />into the footing slots. {fmore than onespIice is used on a rail,
<br />slide L-foot bolt(s) into thefootingslot(s) ofthe interior rail
<br />segment<s) before splidng.
<br />Root peak
<br />l-loot
<br />Stando, 1+33 5\
<br />F,gure 3. Stando#and L-Foot orientat(on.
<br />Loosely attach the rails to the 1-feet with the flange nuts.
<br />Ensure that rails are oriented with respect to the L·feet as
<br />shown in Figure 3. Align the ends of the rail to the edge of the
<br />installation area. Ensure that the rail is sumight and parallel to
<br />the edge of the roof. Then tighten the lag screws.
<br />P ° 'i' A 'i F-l-loot
<br />C - -- -0- -- - ,J
<br />Figure 4. Thisexample assumesa rail seven dmes the tength
<br />of the footing spacing (A). A sptice may be located in any of
<br />theshaded areas. fmore than onespl,ce: used, besure the
<br />combination does not Wolate Requirements 5,6, or Z
<br />Footing and splicing requirements:
<br />The following criteria are required for sound insdations
<br />While short sections of rail are siucturally permissible, they
<br />can usually be avoided by effective planning, which also
<br />promotes superior aesthetics. See "Material planning for rails
<br />and capstrips" (p. 7).
<br />The installer is solely responsible,fbrensuring that theroof and its
<br />structural members can support the array and its live loads.
<br />For roillengths exceeding32 feet, thermal expansion joints may
<br />be necessary. Please contact SunPower.
<br />1. Footing spacing along [he rail (A in illustration above) is
<br />determined by wind loading (see pp. 4-5, especiallystep
<br />4).Foot spacing must never exceed 48 inches.
<br />2. Overhang (B) must be no more than half the length of the
<br />maximum footing spacing (A). For example, if Span A is
<br />32 inches, Overhang B should not exceed 16 inches.
<br />3. Do not locate a splice in the center third of the span
<br />between two adjacent feet.
<br />4. In a spliced length of rail, attend sections must be
<br />supported by no less than two L-feet.
<br />5. All interior rail sections must be supported by no less than
<br />one L-foot.
<br />6. Interiorrailsections supported by only one L.foot must be
<br />adjacent, on at least one side, to a rail section supported
<br />by no less than two L-feet.
<br />7. Rail sections longer than half the foo[ing spadng require
<br />no fewer than two L-feet.
<br /> SF System Planning andAssembly Installation Manual
<br />3. Laying out and installing the next row of L-feet:
<br />With L-feet only: Position the second row of L-feet in
<br />accordance with Figure S. Ensure that you measure between .1 ' .#--'.,. >., , - V IN:91 --2>'../. -1/the lower bolt hole centers of each row of L-feet. Install the 19 ., . :7t™.2 · . '·Modold'hgthi,5-'·· - i>'second row ofL-feetinthesamemannerandorientationas .··, ··c*%24 ' . ,' (1ole lohole) ,> /· 3,·/[·thefirstrow,butleavethelagscrewshalfturnloose. Be :, A- , ,,,, ,awareoftheset-uplimeofyoursealant,the L-fectwillnotbe
<br />fully tightened until Step 4.
<br />..4 ....
<br />/1111+1 /
<br />Figure 5. L-foot separation. See the note on module kngth in the
<br />caption of Figure 2 {p. 4).
<br />4. Installing the second rails:
<br />Install and align the second rail in the same manner and
<br />orientation as the first rail. After rail alignment, tighten the
<br />rail mounting bolts.
<br />Lay one module in placeatorie endofthe rails, and snug
<br />the upper rail (Fig. 6) toward the lower rail, leaving no gap
<br />between the ends of the modules and either rail. (lf pan·head
<br />screw heads represent the true end of the modules, be sure
<br />the screw heads touch the rails on both ends.) Tighten the lag
<br />screw on thai end. Slide the module down the rails, snugging
<br />the rails and tightening the remaining lag screws as you go.
<br />Modute :'../
<br />log 'crew
<br />tholl:tin loose) .
<br />Figure 6. Posimm and secure top rail
<br />5. Installing remaining L-feet and rails:
<br />Install the L-feet and the rails for the remaining rows,
<br />following Steps 3 and 4. You may use the same module to
<br />space all the rows. When complete, confirm that:
<br />· All rails are fitted and aligned.
<br />·. Att footing bolts and lag screws are secure,
<br />• The module used for fitting is resting (but not se-
<br />cured) in the highest row.
<br />5
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