| TECHNICAL INFORMATION PART 3 EXECUTION
3.01 EXAMINATION AND PREPARATION
A. Verify that deck surfaces are clean, dry, free of
ridges, warps or voids.
B. Verify roof openings are correctly framed prior to
installing work of this Section. Do not proceed until all unsatisfactory conditions have
been corrected.
3.02 INSTALLATION
A. Underlayment:
- For pitches of less than 3/12: Lay two layers of 30 or 40
lb. asphalt saturated felt at right angles to roof pitch, mopped solidly with 25 lbs. of
hot asphalt between layers and mopped solidly on top of layers with hot asphalt. Nail to
secure in place as code requires.
- For pitches of 3/12 and greater: Lay one layer of 30 lb. or
two layers of 15 lb. asphalt saturated felt, laid with 4 inch headlap and 6 inch sidelap.
Nail to secure in place as code requires.
B. Flashing:
1. Flash at valleys in strict accordance with Chapter 15 of
the Uniform Building Code:
- Provide no lighter than 28 gauge corrosion resistant metal
flashing extending at least 11 inches from centerline of valley each way.
- Provide a splash diverter rib not less than 1 inch high at
flow line formed as a part of flashing.
- Provide flashing end laps of not less than 6 inches.
- Longitudinal edges shall be turned in not less than 30
degrees, and shall be not less than 1/2 inch in height to prevent water overflow.
- For roof slopes of 3/12 and over, the metal valley flashing
shall have a 36 inch wide underlayment directly under it consisting of a minimum of one
layer of Type 15 felt running the full length of the valley, in addition to other
specified underlayment.
2. At sides of dormers, chimneys and other walls, extend
flashing at least 6 inches up vertical surface.
- Thoroughly counterflash.
- Extend flashing under tile at least 4 inches and turn edge
up 1-1/2 inches.
3. At lower sides of dormers, chimneys and other walls,
extend flashing at least 3 inches up wall and 4 inches over tile, and then thoroughly
counterflash.
4. At wood saddles and returns, line with 16 oz. copper
extending up roof slope not less than 12 inches, and up vertical walls not less than 6
inches, and thoroughly counterflash.
5. Make all counterflashing plugged, pointed and secure.
6. Extend metal gutter up roof to a point higher than the
outer edge of gutter. |
