DSS-M.04.04 — Tool Strike / Ladder Foot Imprint

A tool strike / ladder foot imprint is a localized contact mark on the exposed surface produced by pressed/dragged equipment (e.g., ladder feet, tool bodies, scaffold components). It may present as rectilinear pad outlines, paired tread prints, or blunted arcs consistent with press-and-slide. Classification is appearance-only per VIS (method-agnostic). Inspect under VIS lighting/geometry after Non-Invasive Reveal; record surface numbering and worked-surface status on Forms:

• Rectangular or paired pad geometry; sometimes a short slide trail downstream of the initial contact.
• Two components are common: (a) rubber/plastic transfer film and (b) micro-abrasion/scuff from entrained grit.
• Raking light reveals directional micro-texture and, at higher severities, bright chip-flank sparkles at the leading edge. (Use VIS oblique sweep + raking.)

Surface-catch class (MSRT)

• Transfer only: typically SC-0 (no catch).
• Scuff/abrasion present: SC-1 (slight) up to SC-2 (clear) along leading edges or grit tracks. Perform one light, non-marring pass only; prefer polymer stylus on suspected coated faces; MSRT supports classification, not acceptance.

Visual signature

• Pad outline/tread geometry plus directional micro-lines in the motion direction; raking macros show clean vs. chipped flanks. If the mark vanishes after reveal, treat as residue (not damage) and reclassify per VIS.

Viewing / lighting

• Evaluate clean & dry at 12 / 36 / 72 in, normal incidence and oblique sweep (~60°-120°) with raking light per VIS.

Location / access

• Log pane ID and surface numbering (#1-#4; laminate-internal) on Forms: If fixed parallax proves a between-pane look-alike (e.g., mark inside an IGU), classify CAT-5 (out of in-place scope) and refer.

Assign CAT by appearance + MSRT + morphology (three-part cueing under VIS). Depth figures are indicative to anchor the spectrum:

• CAT-2 (Light): Transfer film with minimal micro-abrasion; SC-0 to SC-1; edges clean, no chip flanks; mainly a raking-only cue at close/standard view. Indicative depth: ~10-40 μm.
• CAT-3 (Moderate): Pronounced scuff with SC-2 (clear) along the lead; minor chip flanks / modeled micro-texture; noticeable at standard view. Indicative depth: ~40-120 μm.
• CAT-4 (Severe): Deep abrasion lane and/or peppered pits/craters from entrained grit; rough, bright flanks; clear at standard & wide-field views. Indicative depth: ~120-300 μm+.
• CAT-5 (by location/condition): Between-pane/inaccessible by parallax, or integrity indicators (active cracks, pane movement) → CAT-5 (out of in-place scope).

CAT assignment is appearance-based; acceptance is separate (VIS §6). Do not use MSRT to “probe” or alter surfaces.

• vs. Rubber/plastic transfer (Residues R.05): If reveal removes the mark and MSRT = SC-0, classify as residue/transfer, not surface damage. Retain photos and reclassify per VIS.
• vs. Linear scoring (M.01): Scoring forms long, continuous lines/tracks; ladder/tool imprints are localized pad geometries with short directional scuff. If long tracks exist, add an M.01 entry.
• vs. Hot-particle peppering (Th.01): Thermal peppering shows distributed fused nodules/pits, not pad geometry; classify under Th.01 when fielded.
• vs. Coating anomaly (Co-family): Coating rub/patchiness lacks chip-flank fracture morphology and is governed by VIS coating acceptance (no anomalies allowed on the worked coated surface).

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking macros of the leading edge (to show chip-flank status) and at least one context frame showing pad/tread geometry. Record distance/angle in-frame.
• MSRT result: Record SC class (SC-0/1/2) with one light, non-marring pass; polymer stylus on suspected coated faces. MSRT is supportive only.
• Forms: Pane ID; product family & surface numbering (#1-#4; laminate-internal); worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist; photos attached.
• Acceptance split: VIS §6 governs post-restoration appearance; classification ≠ acceptance. Transition edges and coating anomalies remain disqualifying per category criteria.

• M.04.04 Tool Strike / Ladder Foot Imprint - Localized pad/tread geometry with directional scuff on surface #___; MSRT = SC-[0/1/2] at leading edge; [no/yes] chip flanks visible in raking macro. Visible at [12/36/72 in] under VIS geometry after Non-Invasive Reveal. Classification: CAT-[2/3/4] by morphology + MSRT; if between-pane/integrity → CAT-5. Location/access: surface numbering recorded; parallax checked. Acceptance: per VIS §6; documentation attached (forms + photo set).