BuildMeter guide · Concrete & Masonry
Stucco Lath and Accessory Planning Guide
Convert wall area into effective lath-sheet coverage while separating laps, corners, beads, joints, flashing and fasteners from the base sheet count.
Direct answer
What to know first
Use net wall area and the lath sheet’s effective dimensions after side and end laps—not nominal sheet area alone. Add a project-specific cutting allowance, then prepare separate takeoffs for casing bead, corner reinforcement, control joints, fasteners and water-management components.
Open Stucco Lath CalculatorUse effective lath coverage after laps
Metal lath sheets overlap at edges and ends, so effective coverage is smaller than nominal sheet area. Subtract the specified lap from sheet width and length, multiply the effective dimensions, then divide the waste-adjusted net wall area by that coverage.
| Group | Measure |
|---|---|
| Field lath | Net wall area divided by effective sheet coverage |
| Casing and stop beads | Opening and termination perimeter |
| Corner reinforcement | Outside-corner height or length |
| Control or expansion joints | Locations shown in the approved layout |
| Fasteners | Framing, substrate and product schedule |
Worked example
A façade has 2,200 ft² gross area and 240 ft² of large openings, leaving 1,960 ft². A 2.25 × 8 ft sheet with 1 in. side and end laps has about 17.2 ft² of effective coverage. With 12% cuts and corners, about 128 sheets are required before bundle rounding.
Do not combine all accessories into waste
Corner bead, casing bead, weep screed, flashing and movement joints are linear products with their own placement rules. A sheet waste allowance should cover field cutting and damage, not replace a detailed accessory takeoff.
Common mistakes
- Dividing wall area by nominal sheet area.
- Deducting every small opening despite increased cuts.
- Ignoring orientation and required laps.
- Estimating fasteners from wall area without reading the substrate schedule.
- Treating lath quantity as a complete stucco-system design.
Use the calculators
Use the Stucco Lath Calculator for sheets and bundles, the Stucco Calculator for plaster volume and the Wall Area Calculator for openings.
Sources and professional limits
- AMICO — Metal lath installation reference
- Stucco Manufacturers Association — Lath and plaster manual
- Building officials — Stucco application guidelines
Final field verification
Before using the stucco lath and accessory planning estimate as a purchase order, walk the project and compare the calculated scope with the installed conditions. Inspect transitions, openings, corners and changes of material because these locations control most accessory quantities. Photograph or sketch unusual details and keep the measurements with the estimate so another person can understand how the quantity was produced.
- Confirm the manufacturer fastening pattern, overlap, drainage-plane sequence and compatible sealants before purchase.
- Mock up one representative opening or corner so layout errors are found before the full elevation is covered.
- Round only after all measured sections have been combined; rounding every small section independently can materially overstate the total.
- Recheck units, package coverage and the number of full stock lengths or containers required before checkout.