Constructions Standards Checklists

ROOF UNDERLAYMENT

ROOF CLADDING AND DRAINAGE  A. For roof pitch 4:12 and greater a single layer of underlayment is installed shingle style with minimum 4" horizontal overlaps and minimum 6" vertical overlaps.  B. For roof pitch less than 4:12 pitch a double layer

of underlayment is installed shingle style with minimum 4" horizontal overlaps and minimum 6" vertical overlaps.  C. Underlayment wraps up adjacent walls a minimum of 12" at shed-roof-to-wall and rake-roof-to-wall intersections.  D. Overlap roofng underlayment at least 4" over hips and ridges.  E. When installed, drip edge is installed over the underlayment at the rakes and under the underlayment at the eaves.  F. Ice & Water Shield is installed on the frst 36" of all eaves per local building code, to prevent ice- damming in areas where freezing occurs.  G. Button cap nails are used to fasten underlayment to roof deck when tiles/shingles are not installed the same day. Spacing of fasteners is 6"o.c. at edges and 12"o.c. in the feld.  H. Valley flashing is installed and has sufficient overhang to shed water beyond fascia. Horizontal courses extend over the valley reinforcement a minimum of 6".  I. 4" x 4" kickout flashing is installed with a 120-deg angle kickout and extending 1 ½" beyond roof edge.  J. Continuous pan flashing with a rolled hem edge is installed at rake roof to wall intersection. Only slotted batten extenders are permitted in pan flashing and must be glued in place. No fasteners are permitted in the bottom of pan flashing.

CONSTRUCTION STANDARDS CHECKLISTS | Roof Cladding & Drainage | 49