Water intrusion is one of the most pervasive and costly threats a homeowner can face—especially in the rainy climates of Portland, OR, and Vancouver, WA. If you own a home with an exterior balcony, deck, or patio, waterproofing should be at the top of your maintenance priorities. When water seeps into structural layers, it can lead to mold growth, wood rot, peeling paint, and costly repairs that only grow more complicated over time.
In this comprehensive guide, we explore expert advice from Ken VahnDijk—owner of Rock Solid Waterproofing—on topics ranging from the best waterproofing materials to optimal timing and whether do-it-yourself approaches are worth the risk. By the end, you’ll understand the key steps to protect your balcony or deck effectively, along with the pros and cons of different methods.
Why Waterproofing Matters
The Impact of Moisture Damage
Moisture might seem harmless at first glance, but water can wreak havoc once it penetrates your home’s outer shell. In damp conditions like those in the Pacific Northwest, water can infiltrate under tile, into wood framing, or through improperly sealed edges. Common signs of water damage include discolored ceilings, cracking in exterior finishes, soft or damp plywood, and mold odors.
Left unaddressed, these small warning signs can quickly escalate. Wood rot undermines structural integrity, mold poses health risks, and rotted materials may need extensive replacement. Investing in quality waterproofing from the start keeps your home safe, extends the lifespan of your balcony or deck, and can even boost your property’s value.
Common Areas Susceptible to Leaks
- Decking and Balconies: Rain collects on horizontal surfaces, making decks and balconies primary candidates for waterproofing.
- Flashing and Transition Points: Where balconies meet door thresholds, walls, or railings, even tiny cracks can funnel rainwater into hidden layers.
- Tile Grout Lines: Grout is porous and prone to hairline fractures; under heavy rainfall, water can travel through these cracks to the subfloor below.
A robust waterproofing solution prevents these problem areas from becoming full-blown leaks.
The Number One Waterproofing Material
Why Westcoat Stands Out
When asked about the top waterproofing material, Ken’s answer is immediate: “In our estimation and experience, it is a process called Westcoat—a multi-layered approach that is highly, highly effective.”
Rather than relying on a single coat of sealant or a thin membrane, Westcoat uses layers of acrylic cements that cure to form a flexible but ultra-durable barrier. Its core benefits include:
- Flexibility: Buildings naturally expand and contract due to temperature changes. A rigid seal can crack under these shifts, but Westcoat’s formulations are designed to move with the structure.
- Multi-Layered Defense: If one layer becomes slightly compromised, additional layers underneath continue to protect against moisture.
- Long Lifespan: Properly installed Westcoat systems can last between 30 and 50 years, significantly reducing the need for frequent reapplications.
- Attractive Finish: A wide range of textures and colors are available, ensuring the surface looks good while offering premium protection.
Comparing Westcoat to Other Options
Other waterproofing methods—like single-ply membranes or rubberized deck coatings—can work in some scenarios, but they often lack the longevity and resilience of a multi-layer system. Rubber coatings, for example, can degrade when exposed to certain chemicals or hot barbecue coals, while single-ply membranes may tear if not installed with great care.
Although there are many products on the market, Ken’s recommendation highlights Westcoat as the gold standard due to its durability, flexibility, and proven track record.
Can You Waterproof Over Old Waterproofing?
Why Removal Is Crucial
One of the biggest misconceptions homeowners have is the idea that they can simply apply a new coating on top of an existing waterproofing layer. Ken clarifies that this approach is not advisable: “It always needs to be removed—the previous layers. Just like roofing, the best roofing is always straight over plywood and removing the existing layers first.”
Here’s why:
- Hidden Damage: Old waterproofing can hide problem areas like rot or mold. If you don’t remove the previous layers, you risk trapping moisture, which can lead to further deterioration.
- Adhesion Issues: Coatings are formulated to adhere to clean, properly prepped surfaces. Layering over worn or damaged materials can lead to bubbling or peeling.
- Incompatibility: Different waterproofing systems may use incompatible chemical bases. If you combine them, curing times or adhesive strengths can be compromised, causing premature failure.
The Process of Removing Old Layers
- Inspection: Professionals check for signs of damage and identify any trouble spots, such as soft or rotted wood.
- Demolition: Tile, old coatings, or membranes must be stripped away.
- Repair and Replacement: Any compromised plywood or framing is repaired or replaced to restore structural integrity.
- Substrate Prep: Surfaces are thoroughly cleaned and smoothed, ensuring the new waterproofing material bonds correctly.
While it might feel like extra work (and cost), removing old waterproofing layers is an investment in long-term success. A clean substrate is the foundation upon which effective waterproofing is built.
What Is the Best Time to Do Waterproofing?
Seasonal Considerations
“Good dry weather is the preferred time,” Ken explains. “Spring, summer, or fall—winter can be done if the deck can be tinted over with plastic, but good dry weather is the best.”
Moisture is the enemy of good adhesion. When you apply waterproofing during damp or rainy weather, the cure time and bond strength can be compromised. Additionally, most materials need specific temperature ranges to set and cure properly.
Working Around Rainy Climates
In locations like Portland and Vancouver, extended dry spells can be rare. Professionals often schedule projects for late spring or mid-summer, when rainfall is less frequent. If you must do the job in winter or during a rainy period:
- Use Temporary Enclosures: Tenting or covering the deck or balcony with plastic sheeting helps maintain a controlled environment.
- Monitor Weather Forecasts: Work around predicted rainfall to minimize exposure before the material cures.
- Proper Ventilation: Even if you tent the area, ensuring adequate ventilation prevents condensation from forming beneath the plastic.
Which Type of Waterproofing Is the Most Expensive?
High Price, High Quality
If you’ve heard that Westcoat can be pricier compared to some alternatives, Ken confirms it: “Which type of waterproofing is the most expensive? That would be the Westcoat system as we use, but it also is the highest quality.”
This premium cost reflects:
- Multiple Layers and Steps: More materials and additional labor go into applying multiple coats. Each layer must be allowed to dry thoroughly before the next is applied, prolonging the timeline.
- Skilled Labor: Westcoat installation is best performed by experienced technicians who understand each phase of the process.
- Longevity and Durability: While the upfront price tag can be higher, the long-term costs are often lower because Westcoat systems last decades, saving homeowners from frequent repairs or replacements.
Why Paying More Can Save You Money
A cheaper waterproofing product may seem appealing initially, but if it fails within a few years, you’ll be back to square one—scraping off layers, repairing damage, and applying another solution. The cycle can be expensive and frustrating. Paying for a high-quality system from the outset can be more cost-effective overall, especially in wetter climates where subpar materials fail faster.
Can Someone Waterproof Their Own Balcony or Should They Hire a Professional?
The Reality of DIY Waterproofing
For homeowners who enjoy do-it-yourself projects, the idea of rolling on a sealant might seem straightforward. However, Ken warns, “If you have a good construction background and you’re very good with tools, then maybe. But it takes an average technician two summers to learn… so DIY really is not generally workable.”
Here’s why balcony waterproofing can be more complex than it appears:
- Proper Surface Prep: Removing old layers, identifying wood rot, and ensuring a clean substrate requires skill and specialized tools.
- Layer-by-Layer Application: Each phase of a multi-layer system demands precise timing and techniques. Applying a coat too soon—or too late—can ruin the final result.
- Critical Edge Work: Edges, corners, and joints often need extra reinforcement. Mistakes in these details can cause immediate leaks.
- Material Incompatibility: Using the wrong primer, mixing brands, or applying products outside their recommended temperature range can lead to quick failures.
- Safety Concerns: Working on elevated surfaces comes with inherent fall risks. Professionals use safety harnesses, railing systems, and protective gear.
When to Consider a Pro
In most cases, especially for second-story balconies or larger decks, hiring a professional ensures the job is done right the first time. Trained crews have the experience to spot potential issues early, apply materials correctly, and guarantee their work. You’ll also have greater peace of mind if issues arise, as many waterproofing contractors provide warranties on both materials and labor.
Tips for Long-Lasting Waterproofing
Regular Inspections
Even the best waterproofing systems benefit from periodic checkups. Look for:
- Cracks or blisters in the surface
- Puddling or pooling water indicating a slope issue
- Signs of mold, mildew, or soft spots
- Damaged flashing or loose transitions around edges
Addressing small issues early prevents them from turning into costly repairs.
Proper Maintenance
- Keep the Surface Clean: Sweeping away leaves, dirt, and debris helps drainage function optimally.
- Check Drainage Routes: Gutters, scuppers, and drain openings should remain unobstructed, especially in fall when leaves are abundant.
- Guard Against Damage: Heavy furniture or sharp objects can scuff or puncture certain coatings. Use protective pads under chair legs and be mindful when moving items.
- Avoid Harsh Chemicals: Some cleaning agents or solvents might erode your deck’s topcoat. Check with your waterproofing provider for compatible cleaning solutions.
When to Reapply or Touch Up
If you notice wear in high-traffic areas, a simple reapplication of the topcoat can often extend the life of your waterproofing. Consult a professional for advice on timing—sometimes a minor touch-up is all you need to maintain your protective layer.
Conclusion
Waterproofing a balcony, deck, or patio is essential for any homeowner looking to preserve structural integrity and maintain a comfortable living environment—particularly in regions with frequent rainfall. From multi-layer products like Westcoat (hailed by Ken VahnDijk as the industry’s “number one waterproofing material”) to timing considerations and the reality of DIY complexities, each aspect of waterproofing plays a pivotal role in the success of your project.
While Westcoat is among the more expensive options, its multi-layer acrylic cement system delivers outstanding longevity—often lasting 30 to 50 years with proper installation and maintenance. However, the best results usually come when you partner with experienced professionals like Rock Solid Waterproofing, serving Portland, OR, Vancouver, WA, and surrounding areas. Their technicians understand how to remove old layers thoroughly, prep surfaces correctly, and apply each coating with precision.
Don’t let water damage erode the enjoyment or value of your outdoor living spaces. By investing in quality materials, scheduling work during conducive weather, and relying on a skilled team, you’ll create a reliable barrier against moisture intrusion for decades to come.
