5
Figure 6. Spanner Mounting
In lag bolt mounting you must locate the center of
the rafters along the top and bottom chalk lines.
One method is to have one man on the roof and
another in the attic. Using a hammer the man on the
roof can tap the roof and determine where it is
denser sounding. The roof man can drill a pilot hole
while the attic man helps with distance corrections.
Then the attic man can call of the distance to the
next rafter while the roof man drills corresponding
pilot holes. Flashing the brackets is done as
previously described. Secure the brackets to the
roof using a ¼” x 3” stainless lag screw, a flat
washer, and a lock washer (Figure 7).
Figure 7. Lag Bolt Mounting
