Renovating an Old House? Start With the Facade — A Kaohsiung Guide to Waterproofing, Recladding, and Subsidies
The real key to a successful old house renovation isn't the visible finishes — carpentry, built-in cabinets — it's whether the wall structure and exterior waterproofing system have been properly addressed. If interior renovation goes ahead while exterior leaks and aging waterproofing are ignored, wall seepage, peeling paint, and cracking will resurface soon after completion. In practice, an old house renovation needs to rebuild the exterior waterproofing system and choose the right coating system at the same time — only then can the result truly withstand Taiwan's long-term humid climate.
Quick Takeaways
- Taiwan's average residential building has a depreciation lifespan of about 55 years; complete facade waterproofing and structural reinforcement can extend a building's usable life by 20-30 years
- Old house facade renovation generally follows three stages — assessment, waterproofing/structural reinforcement, and coating — taking 1.5-3 months for a simple partial job, or 3-6 months or more with a full waterproofing rebuild
- Within a renovation budget, waterproofing and masonry base work are the items most often underestimated — and the ones that should never be cut
- Since 2026, Kaohsiung City has offered a Building Longevity Subsidy covering exterior wall repair and roof waterproofing for legally registered buildings 30+ years old
- Kaohsiung's Apartment Building Facade Finish Repair Subsidy can provide up to NT$300,000 per community, pending a resolution from the owners' committee
- Faux-stone coating systems are lighter than traditional tile, reducing structural load on the facade and shortening renovation timelines
- Coatings certified under ISO 14067 carbon footprint verification and recycled green product certification let a renovation align with energy-saving and sustainability goals
- Skipping a moisture scan and hollow-tile detection before renovation significantly raises the odds of mid-project budget overruns
Renovating an Old House? Start With the Facade — A Kaohsiung Guide to Waterproofing, Recladding, and Subsidies
When people think about renovating an old house, the first things that come to mind are usually re-planning the layout, carpentry, and built-in cabinetry — yet the factor that actually determines whether a renovation lasts is hidden inside the walls: the exterior waterproofing system and coating selection. Kaohsiung's hot, humid climate with intense summer thunderstorms makes this especially true — if the facade isn't waterproofed and coated properly during renovation, even a beautifully finished interior can be undone within a year or two by wall seepage, leaks, or falling tiles. As a professional building coatings specialist, Medusa Paint (Hua Tsai) wants homeowners to know: this guide walks through why facade work should come first, the complete renovation process, budget allocation, subsidies available in Kaohsiung, and how to choose the right material — so old house owners and building management committees can plan renovations that actually hold up.
Why Facade & Waterproofing Should Come First in an Old House Renovation
The most common budgeting mistake in old house renovation is pouring most of the budget into "visible" finishes — ceiling detailing, built-in cabinets — while treating facade waterproofing and masonry base work as optional or something to defer. In reality, moisture inside the wall structure and exterior cracking are the issues most likely to be underestimated, and the ones most likely to surface only after demolition begins.
Kaohsiung's hot, humid climate and intense summer thunderstorms mean that if the facade's original waterproofing layer has already aged or cracked, renovating the interior alone leaves wall seepage and efflorescence free to reappear within six months to a year — at which point the newly finished interior often has to be torn out and redone, at a far higher cost than addressing the facade from the start.
What Happens If an Old House Renovation Only Covers the Interior?
If renovation addresses only the interior layout and finishes, a deteriorating exterior waterproofing layer keeps letting moisture into the wall, causing efflorescence, paint bubbling, and even moisture damage to carpentry cabinets — effectively shortening the lifespan of the interior renovation because of an unresolved exterior problem. That's why facade waterproofing and coating should be planned as part of the same project scope from the outset, not handled separately.
| Dimension | Common Mistake | Correct Approach / Medusa Solution | Quantified Metric |
|---|---|---|---|
| Budget allocation | Concentrating budget on interior styling and cabinetry | Prioritize budget for facade waterproofing and structural reinforcement | Base work is invisible but represents a significant share of total renovation cost |
| Construction sequence | Interior finished first, facade addressed later | Plan facade waterproofing and interior work in the same schedule | Avoids the cost of tearing out finished interior work due to later leaks |
| Material durability | Patching efflorescence with local skim coat and paint only | Fully remove degraded layers and rebuild a multi-layer waterproofing system | Waterproofing lifespan extends from 5-8 years to 10-15+ years |
The real foundation of an old house renovation isn't interior design style — it's whether the exterior waterproofing system has actually been rebuilt. Skip this step, and even the most beautiful interior can be forced into a redo after the next rainy season.
The Old House Facade Renovation Process: From Assessment to Completion
Facade renovation involves structural safety assessment, waterproofing work, and coating application — a project that requires coordination across several trades. The process generally breaks down into three stages: site assessment, waterproofing and structural reinforcement, and coating completion.
The assessment stage should go beyond a visual walkthrough — moisture-content testing and tap testing to map hollow tile areas gives a precise picture of where seepage and detachment are actually occurring, avoiding mid-project surprises and budget overruns. The second stage covers waterproofing and structural reinforcement: removing degraded waterproofing, sealing cracks, and treating corroded rebar. The third stage is the finish coating, applied in layers according to the chosen faux-stone or inorganic coating system.
How Long Does Facade Renovation Actually Take?
A localized waterproofing repair paired with a surface refresh typically takes 1.5-3 months. A full waterproofing system rebuild with extensive recoating usually needs 3-6 months. If a community also needs to go through an owners' committee resolution and subsidy application process, the timeline from assessment to completion often runs half a year or more.
| Dimension | Common Mistake | Correct Approach / Medusa Solution | Quantified Metric |
|---|---|---|---|
| Site assessment | Visual inspection only, no moisture or hollow-tile testing | Commission moisture-content testing + tap-test hollow detection | Identifies over 85% of potential seepage and hollow areas in advance |
| Waterproofing & structural reinforcement | Recoating directly over the old waterproofing layer | Fully remove degraded layers and rebuild a multi-layer waterproofing system | Cuts the odds of mid-project cost overruns by roughly 50% |
| Coating completion | Base and finish work not inspected in stages | Waterproofing, skim coat, and coating each inspected in stages | Reduces post-completion leak complaints by over 80% |
Facade renovation isn't as simple as "a fresh coat of paint" — it's a complete project spanning structural safety, a waterproofing system, and finish quality. The earlier the assessment starts, the more realistic the timeline, and the less likely the project drags on.
How Much Does Facade Renovation Cost? Budgeting Per Ping
Quotes for facade renovation on old houses vary widely, largely driven by site condition, scope of work, depth of waterproofing, and material choice — not simply contractors inflating prices.
When budgeting for facade work, treat waterproofing and coating as non-negotiable base items and allocate sufficient funds there first; interior styling and furnishing can flex around whatever budget remains. This ordering is what actually makes a renovation durable.
Why Do Some Facade Renovation Quotes Come in So Much Cheaper?
Unusually low quotes often skip proper waterproofing substrate treatment or use thinner coating layers. Short-term, the result can look the same, but within a year or two, fading, cracking, or renewed seepage tends to appear, requiring a second round of work that ends up costing more overall. When comparing quotes, ask contractors to spell out material specs, number of coats, and warranty terms — not just the bottom-line price.
| Dimension | Common Mistake | Correct Approach / Medusa Solution | Quantified Metric |
|---|---|---|---|
| Scope of work | Quoting a single facade only, no whole-building assessment | Plan phased work by zone based on actual seepage and hollow-tile distribution | Phased work spreads out the annual budget burden |
| Waterproofing spec | Number of coats and thickness not specified | Clearly specify primer, mid-coat, and top-coat layers and thickness | A complete system extends usable life beyond 10 years |
| Warranty terms | Short warranty period or one that excludes waterproofing | Clearly define separate warranty terms for waterproofing and coating | A complete warranty reduces future complaints and rework costs |
Cost differences in facade renovation are mostly hidden in what you can't see — waterproofing thickness, number of coats, and warranty scope. Rather than comparing price alone, homeowners and communities should require clear material specs and warranty terms to avoid paying for a short-lived job.
Kaohsiung Renovation Subsidies: What's Available for Facade & Waterproofing Work
Beyond self-funded renovation, it's worth checking government subsidy programs. In recent years, Kaohsiung City has rolled out several subsidy schemes targeting facade safety and waterproofing in aging buildings, which can meaningfully offset renovation costs.
Application windows, eligibility, and subsidy caps for each program can change year to year, so confirm the latest announcements with Kaohsiung's Public Works Bureau or Urban Development Bureau before applying, and prepare documentation early to avoid missing the application window.
What Facade- and Waterproofing-Related Subsidies Does Kaohsiung Currently Offer?
Kaohsiung's Building Longevity Subsidy, launched in 2026, targets legally registered apartments and townhouses aged 30+ years, covering facade repair, roof waterproofing, and utility line upgrades — with a maximum subsidy of NT$9.6 million per building, plus a separate cap for individual interior units. Separately, the Public Works Bureau's Apartment Building Facade Finish Repair Subsidy encourages communities to address aging facade safety and streetscape appearance; it requires a resolution from the owners' committee before applying and offers up to NT$300,000 per community. There's also the Urban Renewal Maintenance Program, which partially funds facade recladding and structural reinforcement for buildings 20+ years old that meet certain conditions.
| Dimension | Common Mistake | Correct Approach / Medusa Solution | Quantified Metric |
|---|---|---|---|
| Building Longevity Subsidy | Applying only for personal interior renovation without bundling facade repair | Bundle facade repair, roof waterproofing, and utility upgrades into one application | Up to NT$9.6 million per building |
| Facade Finish Repair Subsidy | Proceeding without an owners' committee resolution | Hold the required resolution, then apply as a community | Up to NT$300,000 per community |
| Urban Renewal Maintenance | Missing application deadlines or eligibility requirements | Confirm building age and eligibility early, and apply within the window | Partially covers facade recladding and structural reinforcement costs |
Subsidy programs can meaningfully ease the cost of facade renovation, but eligibility and deadlines shift year to year. Homeowners and communities should track announcements early and build the subsidy application timeline into the overall renovation schedule.
Faux-Stone Coating vs. Tile vs. Standard Paint: Choosing the Right Facade Material
Material choice for facade renovation directly affects timeline, structural load, and long-term maintenance cost. Traditional tile offers a durable, premium look but is heavier and more labor-intensive to install. Standard paint is fast and inexpensive but has limited weather resistance and coverage, often fading or cracking within a few years. Faux-stone coating sits between the two, balancing appearance with construction efficiency.
Which Material Is Right for an Old House Facade Renovation?
For buildings with more advanced structural aging, a lighter faux-stone coating system is generally the better choice, reducing added load on the existing structure. If a homeowner prefers a specific tile look and the structure can support it, retaining tile in select areas paired with waterproofing reinforcement is also an option. Standard paint works best as an interim measure — for lasting results, it should still be paired with a complete waterproofing system.
| Dimension | Common Mistake | Correct Approach / Medusa Solution | Quantified Metric |
|---|---|---|---|
| Tile | Recladding without a load assessment | Assess structural load capacity before deciding whether to retain tile | Tile systems carry noticeably more load than coating systems |
| Standard paint | Applying paint without treating the waterproofing substrate | Pair paint with a proper waterproofing system rather than color alone | Paint without waterproofing has a markedly shorter usable life |
| Faux-stone coating | Coating layers and thickness not confirmed | Apply primer, mid-coat, and top-coat in sequence with proper inspection | A complete system extends usable life beyond 10 years |
There's no single "best" facade material — only what fits the existing structure and budget. Before choosing between tile, paint, or faux-stone coating, have a professional team assess structural load and waterproofing needs first, so the decision holds up over the long term.
How Long Does a Renovated Facade Last? Key Factors in Durability
How long a renovated facade lasts depends on the completeness of the waterproofing system, material specifications, and maintenance frequency — not just how it looks on the day the coating is finished.
Surface coating applied without a complete waterproofing system can start fading, cracking, or leaking again within 5 years. A full multi-layer waterproofing system paired with faux-stone coating, properly maintained, can be expected to last 10-15 years or more.
Does a Renovated Facade Still Need Regular Maintenance?
Yes. Facades are constantly exposed to wind, rain, and UV, so even with a complete waterproofing system, an exterior inspection every 5-10 years is recommended to catch hairline cracks or coating degradation early — that's what lets the renovation deliver lasting value instead of being neglected after completion.
| Dimension | Common Mistake | Correct Approach / Medusa Solution | Quantified Metric |
|---|---|---|---|
| Waterproofing completeness | Single-layer waterproofing paint or coating applied without waterproofing | Integrated multi-layer waterproofing system + faux-stone coating | Waterproofing lifespan up to 10-15+ years |
| Material specification | Insufficient coating thickness or skipped coats | Apply the specified number of coats and thickness | A complete system markedly extends usable life |
| Ongoing maintenance | No inspection scheduled after completion | Exterior inspection and spot maintenance every 5-10 years | Catches cracks early, avoiding large-scale rework |
A facade's durability is the combined result of waterproofing completeness, material specification, and ongoing maintenance. Only when all three are handled properly can an old house renovation truly withstand Taiwan's rainy, humid climate — rather than just looking good on completion day.
7. Why Choose Medusa Paint (Hua Tsai) for Lasting Building Value
A Three-Way Win in Low Carbon, Aesthetics, and Weather Resistance
Medusa Paint's I-Waterproof series and faux-stone coating system take a facade from waterproofing substrate treatment to a finished stone-look surface in one integrated process — so an old house renovation doesn't have to trade off beauty for waterproofing. The products carry ISO 14067 carbon footprint verification and recycled green product certification: every 1kg of recycled material used reduces CO2 emissions by 1.27kg, aligning facade renovation with energy-saving and sustainability goals.
Integrated, System-Based Expertise That Solves Construction Pain Points
Unlike traditional tile recladding, which involves many separate trades, Medusa Paint offers an integrated solution spanning structural assessment, the waterproofing system, and finish coating, with staged inspection at each phase under our SOP. This helps homeowners and communities reduce the risk of change orders and rework — in practice, helping cut construction costs by up to 50%.
Protecting Asset Value With Lasting Aesthetics
A complete facade renovation does more than solve today's seepage and dated appearance — it protects the building's long-term asset value. Our faux-stone coating system gives a building a stone-grade facade while staying lightweight and weather-resistant, so an old house renovation can improve both safety and appearance while preserving property value.
| Dimension | Common Mistake | Correct Approach / Medusa Solution | Quantified Metric |
|---|---|---|---|
| Waterproofing system | Single-layer waterproofing paint prone to cracking and peeling | Integrated multi-layer waterproofing system + faux-stone coating | Waterproofing lifespan up to 10-15+ years |
| Construction efficiency | Traditional tile work is slow and adds structural load | Faux-stone coating system reduces structural load and shortens timeline | Cuts construction costs by up to 50% |
| Sustainability certification | Standard coatings carry no carbon footprint labeling | ISO 14067 carbon footprint verification + recycled green product certification | Every 1kg of recycled material reduces CO2 by 1.27kg |
What Medusa Paint solves has never been as simple as "a fresh coat of color" — it's the building's overall facade health, from waterproofing to structure to appearance. Whether you're an old house owner or a building management committee, one integrated project delivers lasting peace of mind and preserved property value.
Frequently Asked Questions
- Q1. Does an old house renovation really need to include the facade? Can I just renovate the interior?
- If the facade's waterproofing layer has already deteriorated or shows signs of seepage, we strongly recommend addressing it at the same time. Otherwise, moisture will keep entering through the exterior after the interior is finished, causing efflorescence and damage to the new interior work — effectively cutting short the lifespan of the interior renovation.
- Q2. Why are old house facades especially prone to seepage and tile detachment?
- Older buildings were typically built with simpler waterproofing methods, and as a building ages, corroded rebar expansion, failed expansion joints, and waterproofing degradation accumulate over time. In Kaohsiung's hot, humid climate with intense thunderstorms, these issues tend to surface earlier and more visibly than in other regions.
- Q3. Will a renovated facade leak or lose tiles again?
- A complete waterproofing system with regular maintenance significantly lowers the risk of recurring seepage or detachment. Still, since facades are constantly exposed to wind and rain, we recommend an exterior inspection every 5-10 years to catch hairline cracks or coating aging early.
- Q4. My house is over 30 years old and the facade is already in poor shape — is it still worth renovating?
- Yes — and the older the building, the more important early assessment becomes. Start with a structural engineer's assessment to confirm structural safety, then plan waterproofing and coating work based on the actual seepage and hollow-tile conditions. Most old houses can meaningfully extend their usable life through a complete facade renovation.
- Q5. We already renovated the facade once — why is it leaking again after just a few years?
- This usually means only surface coating was applied without properly rebuilding the waterproofing system, or the coating thickness and number of coats were insufficient. We recommend professional testing to confirm the actual leak path and current waterproofing condition before deciding whether a full waterproofing system needs to be redone.
- Q6. For an old house facade renovation, should I choose faux-stone coating or traditional tile?
- Faux-stone coating is lighter, reducing added structural load on an aging building, and typically has a shorter construction timeline. Traditional tile offers a durable, distinctive look but involves more labor and adds more load. If the structure shows significant aging, we generally recommend prioritizing a faux-stone coating system for the best balance of appearance and structural safety.
- Q7. Roughly how much does facade renovation cost, and can I apply for a subsidy?
- Cost varies by scope of work, depth of waterproofing, and material specification. Kaohsiung has recently introduced several subsidy programs, including the Building Longevity Subsidy and the Apartment Building Facade Finish Repair Subsidy — confirm eligibility and application windows early, as they can meaningfully offset renovation costs.
- Q8. Can I DIY facade cracks or hollow tiles myself?
- We don't recommend it. Facade work involves working at height with fall risk, and waterproofing work requires professional judgment on moisture content and material specification. Improper DIY repairs can fail to solve the underlying problem and may delay the best window for proper treatment — we recommend engaging a professional team for full inspection and construction.
Contact
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Phone ▏ +886-7-365-6297
Address ▏ No. 4, Dongsan St., Nanzi Export Processing Zone, Kaohsiung City, Taiwan
Website ▏ https://www.medusa-paint.com.tw/
Line ▏ https://reurl.cc/MOaYGn
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