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Stucco subcontractors install lath and cement plaster systems on exterior walls, from paper and wire through scratch, brown, and finish coats. General contractors and builders bring a stucco sub in after framing, windows, and rough penetrations are set, because the lath package has to integrate with flashings and the water-resistive barrier before anything gets covered. Over wood-based sheathing, California code calls for a barrier performing at least equal to two layers of Grade D paper, installed as separate continuous planes, with flashings directed between the layers, and a weep screed at the base of the wall held above grade so trapped water can drain. Who installs the paper varies by market, so nail down in the subcontract whether the stucco sub or another trade owns the barrier and how it laps with window flashings. On permitted work the lath inspection is the hard gate: the inspector checks paper laps, fastening, lath, and flashing before the scratch coat goes on, and problems buried under plaster are expensive to correct. Schedule-wise, stucco is slower than most cladding because each coat cures before the next, commonly two or three days after the scratch coat and longer for the brown coat, so a full elevation runs across multiple visits rather than one. Sequence carefully against other exterior trades on mixed-cladding buildings, and keep trades off scaffold shared with the plaster crew during coating days. Stucco is also a common choice in California wildfire zones, where Chapter 7A accepts it as a noncombustible exterior covering. Before award, we recommend confirming license and insurance status: in California, stucco falls under the CSLB C-35 Lathing and Plastering classification, with a free public lookup at cslb.ca.gov. Texas has no statewide license for the trade, though many cities require contractor registration for permitted work.
Stucco application falls under the CSLB C-35 Lathing and Plastering classification, which covers lath installation and cement plaster coatings. It is a common point of confusion because painting and masonry classifications do not cover it. We recommend confirming the C-35 and its status through the free public lookup at cslb.ca.gov before award.
Longer than most cladding, because the system is applied in coats that each need cure time: the scratch coat typically cures two to three days before the brown coat, and the brown coat cures longer before the finish. Plan the stucco window as multiple visits across one to two weeks per area rather than a single mobilization, and protect fresh coats from extreme heat, wind, and freezing.
On permitted work the inspector checks the water-resistive barrier laps, fastener type and spacing, lath attachment, and flashings before the scratch coat is applied. It is the hard gate in the stucco sequence, because defects covered by plaster are difficult and expensive to correct, so hold the crew from browning out until the lath is signed off.
Practice varies by market: some stucco subs carry paper and lath as one package, while on other jobs the framer or a waterproofing sub installs the barrier and the stucco crew laths over it. Over wood-based sheathing, California code expects performance at least equal to two layers of Grade D paper installed as separate planes, so define in the subcontract who furnishes it and who ties it into window and door flashings.
It varies by scope. The main drivers are wall area and building height with the scaffolding it requires, the number of openings and foam trim details, the specified system and finish texture, and access around the building. Compare what each bid carries for paper, lath, scaffold, and patching after other trades before comparing numbers.
Yes for the wall covering itself. Chapter 7A of the California Building Code, which governs construction in mapped fire hazard severity zones, accepts noncombustible exterior coverings and stucco qualifies. Vents, eaves, windows, and decks carry their own Chapter 7A requirements, so stucco walls alone do not make the building compliant.
