Select sand/aggregate gradation for job-mixed scratch and brown coat stucco
domain: astm.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Source aggregate meeting ASTM C897 (aggregate for job-mixed portland cement-based plasters), which sets the gradation and cleanliness requirements referenced by C926
Confirm the aggregate is free of excessive fines, organic material, or deleterious substances that would weaken bond or cause staining
Match the aggregate gradation to the coat being mixed (scratch/brown base coats generally use a coarser gradation than a finish coat sand)
Adjust the cement-to-sand ratio per the C926 proportion tables once aggregate gradation is confirmed compliant
Retain aggregate source certification/test data for the project record where the specification requires it
Known gotchas
Using a masonry sand or fill sand not tested to C897 can look visually similar but cause weak, crumbly plaster; always confirm gradation/cleanliness test data rather than judging sand by eye
C897 governs the aggregate itself; the mix proportions (cement-to-sand ratio) are governed separately by C926's proportion tables — the two standards work together, not interchangeably
Give your agent this knowledge — and 15,500+ more routes
One MCP install gives any agent live access to the full route map across 5,700+ domains, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp
Need this verified for your stack — or a route we don't have yet?