Plaster fails at the substrate. Not at the finish coat. By the time a hairline crack shows up on a finished wall, the cause is usually traced back to one of five lath-stage mistakes — paper laps in the wrong direction, weep screed buried in dirt, fasteners over-driven, expansion joints missed, or a corner bead that's not square.
That's why we treat the lath inspection as the most important walkthrough of the job. If your superintendent doesn't have time to walk it with us, we'll do it twice ourselves.
Every lath assembly we install meets or exceeds CBC and ASTM C-1063 requirements. Submittals — product data sheets, fastener schedules, paper lap diagrams — delivered with the bid. If your plans-check or inspector has a specific note, send it over and we'll match it word for word.
| Lath | 3.4 lb galvanized self-furring metal lath, K-Lath or equal |
|---|---|
| Paper | Two layers Grade-D 60-minute building paper, ASTM D226 |
| Fasteners | Galvanized roofing nails or self-tapping screws, 7-in. O.C. vertical, 16-in. O.C. horizontal |
| Weep Screed | 26-ga. galvanized, set 4 in. above earth or 2 in. above paved surfaces (CBC §2512.1.2) |
| Corner Bead | Expanded-wing galvanized, full-height continuous |
| Expansion Joints | Every 144 sq ft or 18 LF max, per ASTM C-1063 |
| Penetration Flashing | Self-adhering flashing tape, installed before lath, lapped over WRB |
| Inspection | Pre-coat walkthrough with superintendent + Richartz foreman |
"
We don't sub our lath out anymore. Richartz catches things at the substrate that our framers and ours subs miss — saves us punch and re-work every time.
— Custom Home Builder · Manhattan Beach
Recent Lath Work
