A. Grace Tri Flex 15 Synthetic Underlayment or equal 1. Roll Thickness: 7 mils 2. Compliant Codes: ICC-ES AC48, ASTM D779, ASTM D226, ASTM D4869 B. VALLEY AND LOWER ROOF EDGES 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. 3. Install self-adhering ice and water barrier at least 6’ up from the lower edge of the roof at all locations. C. 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, follow local code requirements. 3. Lap underlayment over valley protection at least 6 inches (152 mm). 4. Quantity (5) of 4x8 sheets of plywood roof decking to be expected to be installed. D. 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. 2.6 Roof ridge vent A. Lomanco Omni Pro Shingle Over Ridge Vent or equal B. Ventilation at minimum must meet or exceed local building code requirements. 1. Net Free Ventilating Area (NFVA) of 1:150 as a minimum. 2. Balanced approach for most effective ventilation (balance between the lower and upper parts of the roof by providing 50% of NFVA at the soffit and 50% at the ridge). 3. NFVA at the upper part of the roof should not exceed 50%. 4. Where length of the roof ridge is sufficient provide continuous ridge vents for most effective ventilation approach. 2.7 FASTENERS A. Fasteners: 1. Galvanized steel, stainless steel, or aluminum nails complying with ASTM F1667, minimum 12-gauge, 0.0808 in (2.05 mm) shank with 3/8 in (9.5 mm) diameter head. Check local building code requirements. 2.8 METAL WORK A. Flashing: 1. Provide metal flashing as required for a professional water tight roofing system. 2. If the flashing will be exposed, use painted surface aluminum to match new shingles.
