Kaohsiung Sanmin Old Building Exterior Renovation | Match Your Condition First

Sanmin's exterior wall deterioration is a compound attack — not a single problem. Intense UV × heavy traffic dust × summer downpours × densely packed old buildings — four forces hitting simultaneously. Areas near the Zuoying Harbor wind corridor also carry light salt damage on top of everything else. Without targeted treatment, renovation will fail within three years.

Match Your Building's Problem First

5 Mandatory Inspections Before Any Work Begins

Skip 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 or window corner cracks: possible structural or thermal expansion issue. Rebar-level cracks: rust removal must come first.
3. Moisture content reading — Sanmin's frequent summer rain means moisture 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, projecting window screw holes, and A/C pipe penetrations.
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.

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 ✔ Good waterproofing ✔ Reasonable cost

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

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

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

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

Solves heat, pollution, 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 ✔ Aluminum panels also resist light salt damage ⚠ Highest upfront cost — lowest long-term cost

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 reinforcement 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 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)

2026 Sanmin Pricing Reference

Copy & Send This to Any Contractor When Requesting a Quote

I need an exterior wall renovation 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)

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