Select casing bead and other lath/furring accessories with appropriate corrosion resistance for stucco terminations
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Identify each termination condition (casing bead at openings, control joints, corner reinforcement) requiring an accessory
Select accessory material and coating per ASTM C1861 (lathing and furring accessories/fasteners spec) matched to the exposure category of the project
Where corrosion resistance is a concern (coastal, high-moisture, or ground-contact-adjacent locations), specify a more corrosion-resistant option (e.g., heavier galvanizing or a non-metallic material) rather than the minimum-grade accessory
Confirm accessory compatibility with the lath type and fastening method specified under C1063
Verify PVC or other non-metallic accessories are approved for the specific application per the manufacturer and local code acceptance, since not all accessory types are interchangeable in every location
Known gotchas
Mixing dissimilar metals (e.g., galvanized accessory against a different metal fastener) in a wet environment can accelerate corrosion at the joint — check compatibility, not just individual component ratings
Non-metallic (PVC) accessories are not a universal substitute for metal in every exposure or fire-rated assembly; confirm the manufacturer's approved use list
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