The Best Way to Waterproof Your Patio, Balcony, and Home Exterior: Expert Insights

Jan 29, 2025 | Waterproofing

Waterproofing is crucial for maintaining the integrity and value of your home. When water infiltrates through exterior surfaces such as patios, balconies, or foundation walls, it can lead to costly damages and persistent problems. From mold growth to structural deterioration, unchecked moisture is one of the biggest threats any homeowner faces. In this comprehensive guide, Ken VahnDijk—owner of Rock Solid Waterproofing, serving Portland, OR, Vancouver, WA, and surrounding areas—shares expert insights on the best ways to waterproof outdoor living spaces. We’ll cover the most effective methods, discuss why exterior waterproofing is worth the investment, explore how to waterproof balconies, and shed light on the costs involved. Whether you’re a homeowner seeking to preserve your property for the long run or someone looking to upgrade your outdoor space, this post will equip you with invaluable knowledge on waterproofing and its long-term benefits.

Why Proper Waterproofing Is Essential

Water can be deceptively destructive. While it’s a natural resource we rely on for everyday life, it can wreak havoc on your property if not properly managed. According to Ken, “Other than fire, water is by far the most destructive element in your home.” By keeping water where it belongs—outside your home’s structural elements—you reduce the risk of wood rot, mold, mildew, and compromised foundations.

Preventing Interior Damage

When rainwater or groundwater seeps into cracks and crevices, it doesn’t just affect the exterior surfaces. The water can migrate into your home’s framework, leading to serious interior issues over time. From damaged drywall to soaked insulation, unwanted moisture can cause problems that go unnoticed until they become major repairs.

Preserving Structural Integrity

Your home’s structural integrity depends heavily on keeping wooden beams, floor joists, concrete slabs, and all load-bearing elements dry. Water can weaken these components, reduce their load-bearing capacity, and open the door to insect infestations. By investing in exterior waterproofing measures, you’re safeguarding not only your home’s immediate well-being but also its long-term value.

Maintaining a Healthy Living Environment

If moisture penetrates the building envelope, it can stay trapped inside walls, floors, and ceilings. This lingering dampness is a breeding ground for mold and mildew, which can cause health issues, particularly for individuals with allergies or respiratory conditions. Proper waterproofing drastically reduces the likelihood of mold growth, helping you maintain a healthier indoor environment.

What Is the Best Way to Waterproof a Patio?

When it comes to patios, the answer can vary depending on the patio’s design and location. However, for elevated patios—especially those located above living spaces—Ken advocates a specialized system called Westcoat. This approach is considered by many experts to be the gold standard for long-term, reliable waterproofing.

Understanding the Westcoat System

Westcoat is a multi-layer application of acrylic cements designed to be both flexible and waterproof. The flexibility factor is crucial: concrete and other masonry products can expand, contract, or shift over time due to temperature changes and natural settling. A flexible material can accommodate these movements without cracking, ensuring the waterproof barrier remains intact.

  1. Surface Preparation
    Before any waterproofing system can be installed, it’s essential to prepare the substrate properly. This might involve cleaning, removing old coatings, and repairing any significant cracks or damage. Without proper preparation, even the best products can fail prematurely.
  2. Multiple Layers of Protection
    The Westcoat system involves multiple coats of acrylic cement with waterproofing properties. Each layer is carefully applied to build a sturdy, watertight surface capable of withstanding foot traffic, temperature fluctuations, and moisture infiltration.
  3. Finishing and Aesthetics
    While functionality is the main goal, it’s also possible to incorporate decorative finishes, textures, or colors. This means your waterproofed patio can look as impressive as it is protected.
  4. Long-Term Reliability
    Because this system uses materials designed to flex without cracking, the waterproof seal tends to last longer. It’s an investment that pays off in terms of both durability and minimal maintenance requirements.

Benefits of a Properly Waterproofed Patio

  • Extended Lifespan: A well-protected patio will stand the test of time, resisting the wear and tear caused by constant exposure to the elements.
  • Greater Home Value: Outdoor living spaces have become a premium selling point. A waterproofed patio adds considerable value by showing prospective buyers that key maintenance steps have been taken.
  • Reduced Risk of Water Damage: Prevent moisture from seeping down into the living space or structural elements below.

Is Exterior Waterproofing Worth It?

One of the most common questions homeowners ask is whether investing in exterior waterproofing measures is truly worthwhile. Ken’s short answer is a resounding “Yes.” In his words, “Exterior waterproofing is always worth it because you want to stop the water from getting into the structure in the first place.”

The True Cost of Water Damage

The potential costs of water intrusion can far outweigh the initial investment in waterproofing. Repairs can include replacing rotten wood, mold remediation, refinishing interiors, and more. These expenses often exceed what you would have spent on professional waterproofing in the first place. By preemptively keeping water at bay, you’re not only preserving your property but also saving on future repair costs.

Longevity of Your Home

Waterproofing is about prolonging the life of your property. Once water finds its way into cracks, it can cause progressive damage year after year. Exterior waterproofing measures serve as a critical first line of defense, preserving your home’s value, preventing structural issues, and maintaining a healthy indoor environment.

Peace of Mind

Beyond the financial aspects, exterior waterproofing offers peace of mind. Knowing your home is well-protected from the elements can significantly reduce stress and worry. You can rest easy during heavy rainstorms, confident that your basement, crawl space, and above-ground living spaces are safe from hidden leaks.

How to Waterproof an Outdoor Balcony

Balconies present unique challenges because they’re often exposed to the elements on multiple sides. Whether you have a small private balcony or a larger communal one, thorough waterproofing ensures it remains a safe and enjoyable space for years to come.

Structural Slope and Drainage

As Ken points out, “Waterproofing an outdoor balcony starts by laying down plywood at a slope—typically one quarter inch per foot.” Adequate slope ensures that water drains off the surface, rather than pooling and infiltrating your balcony’s materials.

  1. Establishing the Right Slope
    A slight slope channels water away from the structure and toward gutters or drains. Without it, even the best waterproof coating can fail if water pools in one spot.
  2. Subfloor Considerations
    In many balcony designs, plywood serves as the base or subfloor. This plywood may need to be covered with a moisture-resistant barrier or specialized sheeting before the final waterproofing layers go on.

Multi-Layer Acrylic Cement Systems

Ken recommends a multi-layer system of acrylic cements similar to the Westcoat approach used for patios. This involves:

  • Priming and Repairing: Any cracks or gaps in the plywood are repaired.
  • Applying Flexible Waterproof Coats: Several layers of acrylic cement, each designed to seal out water while allowing slight shifts in the structure.
  • Sealing and Finishing: A topcoat or sealant can be applied for aesthetics and added protection.

Balancing Durability and Appearance

Balconies often serve as an extension of indoor living spaces, so aesthetics matter. Many homeowners choose decorative finishes or color options to match interior design themes, while still ensuring the balcony is sealed and slip-resistant. Modern waterproofing systems can be tailored with textures that help prevent slips and falls, especially in rainy climates like the Pacific Northwest.

How Much Does Balcony Waterproofing Cost?

Cost is often one of the biggest concerns for homeowners. According to Ken, “Usually it’s more than what people expect. It’s a very labor-intensive process. It takes 7 work days, step by step, to do it. And once people see it, they can appreciate the value.”

Factors Affecting Cost

  1. Size and Complexity
    Larger balconies or those with intricate designs require more materials and labor. Curved edges, built-in planters, or multiple entry points can add complexity and cost.
  2. Existing Damage
    If the balcony has prior water damage or structural issues, these must be addressed before waterproofing. Repair work can increase overall costs.
  3. Material Choices
    While acrylic cement systems are highly effective, the specific products you choose and the finish you desire can affect the final price. Premium finishes may cost more but often provide added durability and visual appeal.
  4. Labor and Expertise
    High-quality waterproofing is not a quick fix. It’s a meticulous process that may require up to a week or more, with each layer needing adequate drying time. This step-by-step approach ensures lasting results but also adds to labor costs.

The Value Proposition

While the cost of balcony waterproofing may initially give homeowners pause, understanding the rigorous, multi-layer approach helps clarify why it’s a significant investment. The labor involved is extensive, and the materials used are specialized. In the long run, homeowners often find the price justifiable when they consider the peace of mind, extended structural life, and enhanced property value.

Additional Considerations for Exterior Waterproofing

Professional vs. DIY

Some homeowners consider DIY solutions to cut costs. While there are products available for minor repairs or patch jobs, comprehensive waterproofing is best left to experienced professionals. Experts like Rock Solid Waterproofing can diagnose issues, select the right products, and ensure a flawless installation. Any mistakes in application can lead to premature failure, effectively wasting time and money.

Maintenance and Inspections

Even the best systems require periodic checks. Over time, UV rays, temperature shifts, and normal wear can create small vulnerabilities in waterproofing layers. Regular inspections by professionals help catch minor issues before they escalate into big problems. Quick repairs can extend the life of your waterproofing significantly.

Climate Considerations

In places like Portland, OR and Vancouver, WA, rain is a frequent visitor. The humidity and precipitation levels can accelerate deterioration for materials that aren’t explicitly designed to handle moisture. That’s why investing in robust systems—like Westcoat or other multi-layer acrylic cements—is especially beneficial in these regions.

Long-Term Peace of Mind

Ultimately, an exterior waterproofing project should be seen as a long-term investment in your home. By tackling patio, balcony, and general exterior waterproofing early, you minimize the risks of large-scale repairs down the road. The comfort and security of knowing your home is protected from water damage is priceless, particularly in damp climates.

Conclusion

Waterproofing your patio, balcony, or entire home exterior is one of the best investments you can make to protect your property. Systems like Westcoat offer proven, long-lasting solutions, particularly for elevated patios above living spaces. Balconies benefit from careful slope design, multi-layer coatings, and specialized finishes that keep water out for the long haul. While the cost of professional waterproofing may surprise some homeowners, the meticulous, labor-intensive process ensures durability, peace of mind, and a healthier home environment.

Whether you live in Portland, OR, Vancouver, WA, or a similarly rainy climate, exterior waterproofing is worth every penny. From preventing structural damage to stopping harmful mold growth, keeping water out of your home is key to preserving its value and integrity. If you’re considering a new waterproofing project, consult a reputable contractor like Ken VahnDijk at Rock Solid Waterproofing. You’ll gain expert advice, high-quality workmanship, and a solution designed to last for years to come.