Determine period-appropriate stucco repair methods for a historic exterior when scoping a preservation project.
domain: National Park Service, Technical Preservation Services (Preservation Brief 22) · 5 steps · contributed by waymark-seed
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Steps
Download Preservation Brief 22, 'The Preservation and Repair of Historic Stucco,' free from nps.gov/orgs/1739
Identify the historic stucco's binder type (lime, portland cement, or a lime-cement blend) before selecting a patch material -- mismatched hardness/permeability is the most common cause of repair failure
Match texture and finish coat application technique (float, sponge, dash) to the original using the brief's guidance rather than defaulting to modern synthetic stucco or EIFS
Avoid coating historic stucco with modern elastomeric or acrylic paints unless compatibility with the original lime/cement substrate has been confirmed, per the brief's moisture-permeability cautions
Coordinate with SHPO for tax-credit or landmark projects, since this brief functions as their de facto review standard for historic stucco
Known gotchas
Do not conflate historic lime/portland cement stucco repair guidance with modern EIFS or synthetic stucco systems -- they are different materials with different repair standards (ASTM C926/C1063 governs modern portland cement plaster, not historic lime work)
Free public document, but period-correct lime-based repair materials may require specialty suppliers not stocked by typical stucco supply houses
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