Product Specifications

Fiberglass-Based Asphalt Shingles & Accessories
4. Joints in drip edge shall be lapped minimum 2 in (51 mm) with the upslope piece lapped over
the down slope piece, or per local building code requirements
5. Install fasteners 8 in to 10 in (203 mm to 254 m) on center, approximately 1-3/4 in (44 mm) to 3
in (76 mm) from the outside edge of the drip edge, or per local building code requirements.
C. Valleys
1. Install self-adhering ice and water barrier at least 36 in (914 mm) wide and centered on the
valley. Lap ends 6 in (152 mm) and seal.
2. Where valleys are indicated to be "open valleys", install metal flashing over self-adhering ice
and water barrier before roof deck underlayment is installed; DO NOT nail through the flashing.
Secure the flashing by nailing at 18 in (457 mm) on center just beyond edge of flashing so that
nail heads hold down the edge, or use valley metal with a formed edge and secure with clips.
D. Roof Deck
1. On roofs with slope greater than 4:12, lap horizontal edges at least 2 inches (51 mm) and at
least 2 inches (51 mm) over self-adhering ice and water barrier. Lap ends at least 4 inches (102
m). End laps in succeeding course should be located at least 6 ft (1.8 m) from end laps in the
preceding course.
2. On roofs with pitch between 2:12 to less than 4:12, see application instructions printed on each
shingle wrapper, or follow local code requirements.
3. Lap underlayment over valley protection at least 6 inches (152 mm).
E. Penetrations
1. Vent pipes: Install a 24 in (610 mm) square piece of self-adhering ice and water barrier lapping
over roof deck underlayment; seal tightly to pipe.
2. Vertical walls: Install self-adhering ice and water barrier extending at least 3 in to 4 in (76 mm
to 102 mm) up the wall and 12 in (305 mm) onto the roof surface. Lap the membrane over the
roof deck underlayment.
3. Chimneys: Install self-adhering ice and water barrier around entire chimney extending at least
6 in (152 mm) up the wall and 12 in (305 mm) on to the roof surface. Lap the membrane over
the roof deck underlayment.
3.4 SHINGLE INSTALLATION
A. Install Owens Corning™ shingles (including started shingles as well as hip and ridge shingles) in
accordance with Owens Corning installation instructions and in accordance with local building code
requirements.
B. Install starter course at lowest roof edge and along rake with edge of shingles extending 1/4 in (6.4
mm) over edge of roof. Sealant strip should be closest to roof edge.
C. Install first and successive courses of shingles stepping diagonally up and across roof deck with
Owens Corning recommended offset at each succeeding course. Maintain uniform exposure of
shingles at each succeeding course. Use of a chalk line every other course is recommended.
D. Fasten shingles to deck with number of roofing nails per shingle and type of nails specified by Owens
Corning, or in accordance specified by local Authority Having Jurisdiction.
E. All fasteners must be driven flush with the shingle surface and penetrate at least 3/4 in (19.1 mm) into
the wood deck. Where the deck is less than 3/4 in (19.1 mm) thick, the fastener should be long enough
to penetrate fully and extend through the roof sheathing.
F. Install Owens Corning shingles at valleys, eaves, rakes, hips and ridges in accordance with Owens
Corning installation instructions and local building code requirements.