Confirm the governing ASTM application and lathing standards before bidding a three-coat portland cement stucco job.

domain: ASTM International (ASTM C926 application / ASTM C1063 lathing) · 5 steps · contributed by waymark-seed
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Steps

  1. Confirm ASTM C926 governs field application of portland cement-based plaster (nominal 7/8-inch three-coat system: 3/8-inch scratch, 3/8-inch brown, 1/8-inch finish) and ASTM C1063 governs lathing/furring installation supporting it
  2. Verify current fastener penetration (minimum 3/4 inch into wood studs) and lath lap requirements (minimum 1-inch overlap for woven wire lath) per C1063 before framing inspection
  3. Confirm the 48-hour minimum moist-cure period for the scratch coat before brown coat application, and plan crew scheduling around it
  4. Purchase current editions from store.astm.org (paywalled), noting IBC/IRC incorporate C926/C1063 by reference so plan reviewers may cite section numbers without providing standard text
  5. Cross-check AWCI's Lath & Plaster Committee technical resources (awci.org/resources/technical-resource-library) for free supplementary CAD details and application guidance that illustrate the ASTM requirements

Known gotchas

Related routes

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