Module 7 — Flatwork: Substrate Matrix + Expectations (Lesson)

What you’re doing today

You’re learning how to change method based on what the flatwork actually is.

Concrete ≠ pavers ≠ coated surfaces.

Why this matters

Substrate determines risk.

If you treat everything like bare concrete, you’ll eventually damage something expensive.

Tools & materials (minimum viable)

• Phone camera (Proof Pack)
• A simple expectation script (old stains ≠ organic growth)

The substrate matrix (simple)

Bare concrete (most common)

• Usually responds well to surface cleaning + proper chemistry

Pavers / stone

• Higher risk of joint sand disruption
• Expectations matter

Coated / painted surfaces

• High damage risk
• Often requires a different lane (and different pricing)

FIGURE (pressure vs flow mindset)

Step-by-step: expectation setting (foreman simple)

1. Call out the difference between:
   • organic growth (cleanable)
   • old stains / wear (may improve but not disappear)
2. Confirm what “success” means before you start.
3. Document pre-condition.

Decision points

• If the surface looks coated:

  • slow down and confirm before cleaning

• If you’re facing a rust stain:

  • treat it as chemistry, not pressure — don’t turn a small spot into a bigger repair

• If stains are old:

  • set expectations in plain English

Common mistakes + fixes

• Promising stain removal without testing
  • Fix: test spot + expectations first.

What good looks like

• Customer understands “improved vs removed”
• You have proof photos of before condition

SOP

Do this next (assignment)

• Identify 3 flatwork types at a property (concrete/pavers/coated).
• Write one expectation sentence for each.

References

• Proof Pack SOP: 04_sops/proof-pack/proof-pack-sop-v1.md
• Final Walk checklist: 04_sops/universal/final-walk-checklist-v1.md

Printables

• Operator Checklist Pack (truck copy): 03_curriculum/printables/operator-checklist-pack-v1.md

Field Guide & Interactive Calculator (tbsoftwash.com)

🧱 Interactive Surface Cleaner Nozzle & Flatwork Calculators:

• Surface Cleaner Nozzle Chart: How to Prevent Zebra Stripes on Concrete (Interactive Calculator) →
• Commercial Drive-Thru Cleaning Guide for Tampa Bay →
• HOA & Commercial Parking Lot Oil Stain Degreasing Guide →
• Well-Water Irrigation Rust & Fertilizer Stain Removal →

Gear Box (Amazon)

Stripe-Free Flatwork, Post-Treatment & Degreasing Loadout

• MTM Hydro DN10 Italian Ball Valve + Raincovo 3/8" Stainless Quick Connects — switch from surface cleaner to ball-valve rinse without shutting down the machine.

• General Pump YG5000 Rear-Entry Spray Gun + Essential Washer Hose Whip + Meteor Blast Pivoting Coupler.

• OCPTY 100ft 3/8" Non-Marking Gray Hose / YAMATIC Non-Marking 3/8" Hose / Uberflex Hose.

• General Pump 100776 High-Draw Downstream Injector / X-Jet M5 — mandatory SH post-treatment to eliminate lingering pore spores ("zebra stripes").

• Sodium Hydroxide (Caustic Soda) + Oxalic Acid 99% Powder — oil saponification and rust chelation prior to flatwork passes.

• XTRATUF Ankle Deck Boots / HISEA Tall Waterproof Rubber Boots.

• WOJET 20-Inch Stainless Steel Commercial Surface Cleaner (4500 PSI) — heavy-duty rotary deck for stripe-free driveways and sidewalks.

• 1/4" MEG 25020 Stainless Spray Tips (for 4 GPM rigs) / 1/4" MEG 25025 Stainless Spray Tips (for 5–5.5 GPM rigs).

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