INSTALLATION GUIDE
PAGE
9
ROOF PREP FOR LAG BOLT INSTALL
MARK ARRAY LOCATION:
Mark array location and determine
roof attachment locations based
on array layout. Snap chalk lines to
mark each row of roof attachment
points. On shingle roofs, snap
lines 1-3/4” below upslope
edge of shingle course. Locate
rafters and mark at intersection
of attachment lines. Attachment
spacing determined per Design
and Engineering Guide or project
specific U-Builder Engineering
Report .
DRILL PILOT HOLES:
Drill a 7/32” pilot
hole at each roof attachment. Clean roof
surface of dirt, debris, snow, and ice. Fill
each pilot hole with sealant.
CAUTION
In case of missing a rafter, fill in the pilot hole with sealant.
Pro Tip:
Drill pilot holes within 1/4'" of chalkline to allow rail to
slide freely in Rail Clamps. See Page 14.
