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Page 3 of 8 <br />Date Modified: 09/12/07 <br />Step 2: Locating roof rafters along chalk lines <br />1) Since rafters are normally located every 48” <br />on center (o/c), finding one reference rafter <br />should be sufficient for approximating the lo- <br />cation of additional rafters by measuring 48” <br />from the center of the first. <br />2) If the roof eve (bottom edge of roof) is ex- <br />posed, reference the bottom edge of the roof <br />rafter location and use to approximate the lo- <br />cation of the roof rafter/intersection chalk line <br />on the upper section of roof. (EASIEST FOR <br />TILE ROOF) <br />If the roof has a closed or blind soffet <br />(enclosed rafters not visible at roof edge), <br />the nailing pattern along the fascia board <br />(board attached to ends of rafters) may indi- <br />cate the rafter location at the bottom edge <br />of the roof. <br />TileTrac <br />Installation Manual <br />® <br />For installations requiring more than one row, with no <br />spacing between rows, the distance between adjacent <br />rail pairs will measure approximately the length of the <br />module less 48”. <br />The measurements and formulas listed <br />above are the recommended and engi- <br />neered values for the RoofTrac ® mount- <br />ing system—non-tilt up. <br />48” <br />Snap chalk lines along <br />the location of where the <br />support rails will be <br />placed once spacing is <br />calculated and measured. <br />Actual spacing will be deter- <br />mined on pattern of the <br />roofing material to ensure a <br />proper seal. <br />2510 N. Hathaway <br />St05/26/22