Weep Screed

Is it required or necessary to apply weep screed at the bottom of stucco when the stucco is on the walls under a covered patio. Also how about at the wall roof joint where flashing has been applied at least 10" up the wall.

Yes it’s necessary (and required in modern framed construction) to install the weep-screed at the sill plate, regardless of what might be attached to the house later.

Roof to wall transitions require flashing as well, but not a “weep-screed.”

[FONT=Arial]**R703.6 Exterior plaster. **Installation of these materials shall be in compliance withASTMC926 andASTMC1063 and the provisions of this code.

"R703.6.2 Plaster. On wood-frame construction with an on-grade floor slab system, exterior plaster shall be applied to cover, but not extend below, lath, paper and screed."
Keyword: “screed”. i.e, drainage system.

**“R703.6.2.1 Weep screeds. **A minimum 0.019-inch (0.5 mm) (No. 26 galvanized sheet gage), corrosion-resistant weep screed or plastic weep screed, with a minimum vertical attachment flange of 31/2 inches (89 mm) shall be provided at or below the foundation plate line on exterior stud walls in accordance with ASTM C 926. The weep screed shall be placed a minimum of 4 inches (102 mm) above the earth or 2 inches (51 mm) above paved areas and shall be of a type that will allow trapped water to drain to the exterior of the building. The weather-resistant barrier shall lap the attachment flange. The exterior lath shall cover and terminate on the attachment flange of the weep screed.”

Keywords: “shall”, “screeds”, “2 inches above paved areas”, “4 inches above earth”

*** **“R703.8 Flashing. **Approved corrosion-resistant flashing shall be applied shingle-fashion in such a manner to prevent entry of water into the wall cavity or penetration of water to the building structural framing components. The flashing shall extend to the surface of the exterior wall finish. Approved corrosion-resistant flashings shall be installed at all of the following locations: 1. Exterior window and door openings. Flashing at exterior window and door openings shall extend to the surface of the exterior wall finish or to the water-resistive barrier for subsequent drainage.
2. At the intersection of chimneys or other masonry construction with frame or stucco walls, with projecting lips on both sides under stucco copings.
3. Under and at the ends of masonry, wood or metal copings and sills.
4. Continuously above all projecting wood trim.
5. Where exterior porches, decks or stairs attach to a wall or floor assembly of wood-frame construction.
6. At wall and roof intersections.
7. At built-in gutters.”
Keywords: “shall extend to the surface” i.e., shall be visible, "shall be installed at all of the following locations"

It depends on the substrate. What is the structure made of?