?️ Kaohsiung Sanmin Old Building Exterior Renovation | Match Your Condition First

Sanmin's exterior wall deterioration isn't a single problem — it's a compound attack. Intense UV × heavy traffic dust × summer downpours × densely packed old buildings — four forces hitting simultaneously. Add light salt damage from the Zuoying Harbor wind corridor in certain areas, and without targeted treatment, even a fresh renovation will fail within three years.

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⚡ Match Your Building's Problem First

What You're Seeing	What It Means	What Needs to Be Done
Wall turning black, traffic grime won't wash off	Vehicle exhaust and dust bonding to surface long-term	Stone-texture coating or anti-pollution transparent topcoat
Surface cracking / powdering	Intense UV accelerating coating breakdown	Elastic coating + deep-penetrating primer
Paint bubbling / peeling	Summer rain pushing moisture content too high	Breathable mineral coating — first choice
Hollow sound when tiles tapped / tiles falling	Heat island effect intensifying thermal expansion cycles	Remove + re-tile with anchor bolt dual-fix system
Leaking at windows, balcony, or A/C pipe holes	Aged sealant, waterproofing joints failed	Full removal + backer rod + silicone reapplication
Exposed rebar / rust streaks running down wall	Salt + rain corrosion reaching structural layer	Rust removal + anti-rust treatment + mortar repair
Extremely hot indoors on west-facing side	No insulation layer present	Ventilated dry-cladding system

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? 5 Mandatory Inspections Before Any Work Begins

Miss any one of these and problems will reappear after renovation.

1. Exterior wall deterioration assessment — Are tiles hollow across large areas? Is the cement surface powdering? Is existing paint peeling or bubbling in sheets?
2. Crack classification — Hairline cracks: coating can handle. Over 0.3mm: V-groove + resin fill required. Diagonal cracks at window corners: possible structural issue needing separate assessment. Rebar-level cracks: rust removal must come first.
3. Moisture content reading — Sanmin's frequent summer rain means moisture content must be below 8–12% before any coating is applied. Over 12% guarantees bubbling.
4. Water ingress source mapping — Most common in Sanmin: window frame corners, balcony slabs, parapet walls, A/C pipe penetrations, and crack absorption points.
5. Dust pollution level — Walls facing Minzu Road, Jiangong Road, Jiuru Road, or other major corridors need anti-pollution coating or stone-texture coating. Standard paint turns black within one to two years.

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?️ 5 Methods Compared — Find the Right Fit for Your Building

A｜High-Durability Elastic Coating

Best cost-performance ratio. Best for: cement walls, heavy cracking, surface powdering Sanmin recommended add-on: anti-pollution transparent topcoat (essential against traffic dust) ✔ UV-resistant ✔ Crack-resistant ✔ Waterproof ✔ Reasonable cost

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B｜Mineral Coating / Silicate Coating

First choice for walls where repeated repainting has failed or moisture keeps returning Breathable system lets moisture disperse outward — eliminates bubbling at the root cause ✔ No bubbling ✔ No powdering ✔ UV-resistant ✔ Strong anti-pollution performance ⚠ Higher material cost — strict substrate preparation required

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C｜Stone-Texture Coating

Strongest visual transformation — simultaneously solves Sanmin's heavy traffic dust problem Stone-like appearance with strong anti-pollution performance — ideal for facades facing major roads ✔ Anti-pollution ✔ Fade-resistant ✔ Appearance stays cleaner and better-looking longer ⚠ Requires a crew with proven application experience

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D｜Full Tile Removal + Re-tiling

Required when hollow rate exceeds 15% or tiles are already falling Sanmin's heat island effect intensifies thermal expansion — dust packed into tile joints absorbs water and accelerates failure Mandatory method: elastic mortar + mechanical anchor bolts (dual-fix system) ⚠ Patching tiles without anchor bolts means the same problem comes back quickly

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E｜Dry-Cladding System (Most Durable + Strongest Insulation)

Best for: solving heat, pollution resistance, and long-term durability in one project Materials: aluminum panels, fiber cement board, honeycomb panels ✔ Strong anti-pollution ✔ Ventilation gap significantly lowers indoor temperature ✔ Won't crack or bubble ✔ Installs over existing wall ⚠ Highest upfront cost — lowest long-term cost

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? Standard 11-Step Construction Process

1.  Scaffolding setup + safety measures

2.  High-pressure cleaning at 150 bar (removes dust, oil film, loose coating)

3.  Hollow tile inspection → removal → mortar patching

4.  V-groove crack cutting + resin injection fill

5.  Exposed rebar: rust removal + anti-rust treatment

6.  Deep-penetrating primer coat (improves adhesion)

7.  Full-surface fiberglass mesh reinforcement (mandatory for old buildings)

8.  Main coating applied in 2–3 layers (elastic / mineral / stone-texture)

9.  Anti-pollution transparent topcoat (strongly recommended for Sanmin's traffic environment)

10. Window frame, pipe, and rain shield edge sealing (silicone + cover strip)

11. Post-completion water-spray leak test (photo/video documentation required)

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? 2026 Sanmin Pricing Reference

Method	Price per Ping (NTD)
High-durability elastic coating	600 – 1,600
Silicate / mineral coating	1,500 – 3,200
Stone-texture coating	1,200 – 3,800
Full tile removal + re-tiling	3,500 – 6,500
EIFS thermal insulation system	5,000 – 10,000
Dry-cladding panel system	6,500 – 13,000

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? Copy & Send This to Any Contractor When Requesting a Quote

I need an exterior wall renovation assessment and quote for an old building in Sanmin, Kaohsiung. Please provide:

1. On-site inspection report: hollow tile rate, crack classification, moisture content
2. Recommended method (coating / tile / cladding) with reasoning
3. Material specifications: brand, coverage rate, anti-pollution rating
4. Construction sequence and project timeline
5. Itemized quote: scaffolding / substrate repair / coating / edge sealing / debris removal listed separately
6. Warranty terms: water ingress, adhesion failure, color fading — years covered for each
7. Sanmin or central Kaohsiung project references (with photos)
8. Post-completion water-spray test record (photo or video required)

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When requesting a quote, please provide first: floor area, current condition photos, and project location.