DSS-R.02.03 — Stucco / Lime Film (residue)

Stucco/lime film (residue) is an appearance change on glass from cementitious or lime-rich materials (stucco brown/finish coats, scratch coats, slurry, limewashes) deposited during application, float/rod work, cutting/grinding, or cleanup/rinse-downs. It presents as a chalk-grain veil with runs/rings and tide-line halos that follow gravity paths and splash footprints. This entry covers residual films (removable/partially removable) and does not include confirmed alkaline etch (see Ch.02 Alkaline Attack). Classification is appearance-only per VIS (method-agnostic). Inspect after Non-Invasive Reveal per VIS §5; record surface numbering and worked-surface status.

• Grainy, light-colored veil (off-white/grey/tan) with drip legs, sling arcs, or roller splash consistent with stucco work lines; sometimes aggregate specks.
• Tide-line rings where hose-downs dried; heavier at head/jamb/sill interfaces and below scaffolding.
• Under raking: mineral particulate sparkle (non-metallic), micro-grain texture, feathered run edges.

Surface-catch class (MSRT)

• Typically SC-0 (loose/consolidated film on top of glass).
• SC-1 may occur where paste consolidated (sun/heat) or where improper abrasive wiping introduced very shallow micro-texture. SC-2 suggests misclassification-re-evaluate for alkaline etch (Ch.02) or mechanical abrasion (M-family).
• Perform one light, non-marring pass on a small revealed test patch; use polymer stylus if a functional coating is suspected. MSRT supports classification only.

Visual signature

• Chalk-grain veil with drip legs/runs, splash arcs, roller spatter; ring/tide lines from rinse-down.
• No chip-flank sparkle (not linear scoring); no fused nodules/pits (not hot particle).
• May show coarse grains (sand/aggregate fines) adhered within run paths.

Viewing / lighting

• Evaluate clean & dry at 12 / 36 / 72 in, with normal incidence and oblique sweep (~60°-120°); raking macros to resolve grain, run edges, and rings. Record distances/angles in-frame.

Location / access

• Record pane ID and surface numbering (#1-#4; laminate-internal). If fixed parallax indicates residue on #2/#3 (IGU cavity), classify CAT-5 by location (out of in-place scope) and refer.

Mechanism cue (context)

• Active stucco/lath work, scratch/brown/finish operations, EIFS basecoats, limewashes, hose/rinse-down without shielding; cut/grind near openings.

Assign CAT by visibility at acceptance geometry and MSRT after a controlled reveal on a small area. Depth values are indicative-field measurement not required.

• CAT-1 (Benign / non-relief): Light chalk-grain veil/runs; SC-0 after reveal; mainly angle/raking visible; minimal at standard view. Indicative relief: 0-10 μm (optical film).
• CAT-2 (Light): Persistent consolidated residue or tide-line rings with SC-1 (sun-baked paste, slight shallow texture from mishandling); limited standard-view impact. Indicative relief: ~10-40 μm.
• CAT-3 (Moderate): Broad run fields/rings legible at standard distance; SC-1 in worst zones; context suggests extended dwell/heat or heavy splash. Indicative relief: ~40-120 μm.
• Reclassify when: If, after true residue removal, substrate exhibits modeled micro-texture, matte patches, or SC-2 → evaluate under Ch.02.01/Ch.02.02 (Alkaline Attack: cement/mortar slurry/cement run-off etch).
• CAT-5 (by condition/location): Between-pane/inaccessible by parallax, integrity indicators, or confirmed functional-coating loss on the surface to be worked → CAT-5.

CAT is appearance-based; acceptance is separate under VIS-A at 12/36/72 in. Do not abrade to “force” removal during classification.

• vs. Drywall/plaster film (R.02.02): Gypsum films are softer/chalky, often uniform with wipe arcs; stucco/lime shows grainier residue, distinct runs/splash arcs, and alkaline context (exterior elevations).
• vs. Paint overspray (R.02.01): Overspray presents micro-droplet dots and binder gloss; stucco/lime shows grain and non-gloss matte with run legs.
• vs. Alkaline attack (Ch.02): True etch exhibits modeled micro-texture persisting after residue lift and may show SC-2; R.02.03 is residue (film) with SC-0/SC-1, removable in principle.
• vs. Mineral staining/etch (Ch.03): Mineral patterns follow spray/rings from water systems and can be glassy/ring-like; stucco/lime tracks trade work (trowel splash, hose rinse paths) and features grain embed.
• vs. Silicone/PIB smears (R.01.xx): Sealant smears read oily/tarry with corduroy or stringers; stucco/lime is powder/grain matte with run legs and no organics sheen.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; raking macros of grain, run legs, rings/tide lines; context frames of stucco/lime operations, scaffolds, hose-down zones. Record distance/angle in-frame.
• MSRT result (substrate): After a small reveal test patch, perform one light, non-marring pass; record SC-class (SC-0/SC-1/SC-2).
• Forms: Pane ID; product family & surface numbering; worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist; photos attached.
• Acceptance split: Post-restoration acceptance per VIS-A §6; classification ≠ acceptance. Coated-face appearance rules apply per VIS §6.2.e when the worked surface is a factory functional coating.

• R.02.03 Stucco / Lime Film (residue) - Grainy, light-colored veil with runs/tide-line rings on surface #___; post-reveal test patch shows [SC-0/SC-1]; visible at [12/36/72 in] under VIS geometry. Morphology: grain/aggregate fines, splash arcs, feathered run edges; no chip-flank sparkle, no discrete pits. Classification: CAT-[1/2/3] by visibility and SC-class; reclassify to Ch.02 (alkaline attack) if etch/SC-2 persists after true residue lift; CAT-5 if between-pane or coating-side loss on the surface to be worked. Forms + photo set attached; acceptance per VIS-A §6.