Washington State's climate is tough on commercial buildings. Rain, temperature swings, and persistent moisture put constant pressure on exterior walls, roofs, and masonry surfaces. Elastomeric waterproofing coating is one of the most effective ways to protect a structure against water damage over extended periods.
Unlike standard exterior paint, elastomeric coatings are made with synthetic polymers that allow the material to stretch and contract with the building as temperatures change. This flexibility is what sets them apart from rigid waterproofing options. At Hello Painting, we help commercial property owners across Washington choose and apply the right coating system for their building.
What Is Elastomeric Waterproofing Coating and How Does It Work?
Elastomeric waterproofing coating is a fluid applied waterproofing product that dries into a thick, flexible membrane on the surface of a building. It bonds directly to the substrate, whether that is concrete, masonry, metal, or wood, with appropriate surface preparation and priming. It creates a seamless barrier that prevents moisture from penetrating the structure. Because it is applied in liquid form, it fills small cracks and gaps that a sheet membrane or standard paint would bridge over without sealing.
So how exactly does it protect a building? The key is in the material itself. Elastomeric coatings are formulated with synthetic polymers that give the dried film the ability to expand and contract. When the building's walls or roofs shift slightly due to temperature changes, the coating moves with the structure rather than cracking. This stretch-and-recover ability is what gives an elastomeric membrane its long-term durability and makes it especially well-suited for commercial building waterproofing in climates like Washington's.
Most elastomeric waterproofing products are cold applied, meaning no heat or open flame is needed during installation. They can be applied with a brush, roller, or spray, depending on the surface type, the product specifications, and the scope of the job.
Acrylic vs. Silicone Elastomeric Coating: Which One Is Right for Your Building?
Both acrylic elastomeric coating and silicone elastomeric coating are widely used in commercial building waterproofing, but they perform differently depending on the application.
Acrylic elastomeric coating is water based, which makes it easier to apply and clean up. It adheres well to masonry surfaces, concrete, and stucco, and it performs reliably as a UV resistant elastomeric waterproof coating on sun-exposed walls. It is also generally more breathable, which allows moisture vapor to escape from the substrate rather than becoming trapped.
Silicone elastomeric coating offers superior water repellency and flexibility, making it a preferred choice for elastomeric roof coatings and surfaces that experience standing water. When applied over a compatible metal primer, it bonds well to metal and is highly resistant to UV radiation, which helps maintain the integrity of the coating over extended periods without significant discoloration or cracking.
💡 Pro Tip: If your building has both a flat roof and concrete exterior walls, a two-product approach is often the most effective. Apply a silicone elastomeric coating on the roof and an acrylic elastomeric coating on the vertical walls to match the performance needs of each surface.
What Surfaces Can Elastomeric Waterproofing Coating Be Applied To?
Elastomeric waterproofing coating is one of the most versatile waterproofing applications available for commercial buildings. It can adhere to a wide range of substrates and is commonly used across many different surface types.
Surfaces that work well with elastomeric coatings include:
- Concrete walls and foundations: Elastomeric coating for concrete walls creates a flexible, seamless barrier that bridges hairline cracks and protects against moisture intrusion.
- Masonry and stucco: The coating bonds well to textured masonry surfaces and fills small voids without requiring extensive prep beyond cleaning and priming.
- Metal roofs and panels: Silicone and acrylic formulas both adhere to properly prepared metal surfaces and resist the expansion and contraction that metal undergoes with temperature changes.
- Wood substrates: Elastomeric products can be applied to exterior wood surfaces where a flexible, moisture-resistant film is needed.
- Stone and block: Coatings adhere to stone and concrete block, protecting these materials from water infiltration and surface discoloration.
What surfaces should be avoided? Surfaces that are actively leaking, heavily contaminated, or structurally compromised will not benefit from a surface coating alone. Waterproofing applications on these substrates require repair and preparation work before any liquid applied waterproofing membrane is installed.
The Application Process for Commercial Elastomeric Waterproofing
Getting elastomeric roof coatings or wall coatings to perform well over the long term depends almost entirely on proper application. Cutting corners during prep or applying too thin a coat will reduce durability and shorten the system's life.
Here is how professional contractors approach the job:
- Surface Inspection: Assess the building's exterior walls, roofs, and masonry surfaces for cracks, moisture intrusion, damaged sections, and areas with poor adhesion from previous coatings.
- Surface Cleaning: Pressure wash all surfaces to remove dirt, mildew, chalk, and loose material. Clean surfaces are essential for the coating to adhere properly to the substrate.
- Repairs: Fill cracks, holes, and damaged areas with an appropriate filler or patching compound. Pay close attention to penetrations, joints, and transitions where water commonly enters.
- Priming: Apply a compatible primer if the product or surface conditions call for it. Priming improves paint adhesion and ensures the topcoat bonds fully to the substrate.
- First Coat Application: Apply the elastomeric waterproofing coating at the manufacturer's recommended minimum thickness using a brush, roller, or spray. Maintain consistent coverage across the entire surface.
- Second Coat Application: Most liquid applied waterproofing membrane systems require a second coat to achieve the correct dry film thickness and performance rating. Allow the first coat to cure before applying the second.
- Inspection and Touch-Ups: Walk the entire surface to verify full coverage, check for thin spots, and address any areas that did not achieve the required thickness.
💡 Pro Tip: Temperature matters during application. Most elastomeric coatings should not be applied below 50°F. Cold conditions slow curing and affect how the coating bonds to the substrate. Always check the product data sheet for the specific minimum before scheduling work in cooler months.
Why Commercial Building Waterproofing in Washington Demands a Flexible Solution
Washington's climate creates specific waterproofing challenges that rigid systems struggle to handle. Rain falls consistently across much of the state for extended periods during fall, winter, and spring. Buildings contract in the cold and expand during warmer months. This constant movement stresses the structure and any coating applied to it.
Liquid applied waterproofing membranes are built for this kind of performance. Because they are applied in liquid form and cure into an elastomeric membrane, they conform to the exact shape of the surface with no seams, laps, or transitions where water could find a weak point. A sheet membrane, by contrast, requires overlapping sections that can lift, crack, or separate over time.
Commercial building waterproofing with elastomeric coatings also provides a layer of UV protection. Many products include special additives that reflect UV radiation, slow the breakdown of the coating, and help maintain the building's appearance alongside its waterproofing performance. For roofs and south-facing walls, a UV resistant elastomeric waterproof coating can help extend the service life of the system
You can explore our exterior painting and waterproofing services for commercial and residential buildings to learn more about how we protect Washington buildings from the elements.
Common Signs a Commercial Building Needs Waterproofing
How do you know when commercial building waterproofing is no longer optional? There are several clear warning signs that property owners and managers should watch for.
Watch for these signs on your building:
- Visible water stains or discoloration on interior walls
- Mold or mildew growth on exterior masonry surfaces or inside the building
- Peeling or bubbling on the current exterior coating
- Cracks in concrete walls or stucco that allow water to enter
- Water pooling on rooftops or slow drainage after rain
- Efflorescence (white mineral deposits on masonry surfaces caused by water moving through the wall)
- Musty odors in indoor spaces near exterior walls
These signs indicate that moisture is compromising the building's structure and that the existing waterproofing system has reached the end of its useful life. Addressing these issues early with a fresh liquid applied waterproofing membrane protects the building's structural integrity and avoids more expensive repairs down the road.
For a look at real waterproofing and exterior coating projects, browse our completed commercial and residential painting projects to see the quality of our work firsthand.
How Long Does Elastomeric Waterproofing Coating Last?
Elastomeric waterproofing coating generally lasts between ten and twenty years, depending on the product quality, surface preparation, application thickness, and the level of UV and moisture exposure the building faces. Elastomeric roof coatings on flat or low-slope commercial roofs typically fall in this range when applied correctly and inspected periodically.
Maintenance plays a role in longevity. Industry professionals generally recommend inspecting coated surfaces annually or every one to two years for signs of wear, thin spots, or areas where the coating has begun to separate from the substrate. Catching small issues early allows for targeted recoating rather than a full system replacement.
The performance of liquid applied waterproofing membranes also depends on the original film thickness. A thin coat that falls below the manufacturer's recommended minimum will not achieve the same durability or waterproofing performance as a properly applied system. This is one reason why professional application is so important for commercial projects.
Conclusion
Protecting a commercial building from moisture damage is one of the most important investments a property owner can make, and elastomeric waterproofing coating delivers the flexibility, durability, and seamless coverage that Washington's climate demands. Whether you need elastomeric roof coatings, elastomeric coating for concrete walls, or a full commercial building waterproofing system, the right product and proper application make all the difference. Hello Painting is ready to help you protect your building and extend its life. Contact our team today to schedule a free on-site consultation and discuss the right waterproofing solution for your property.
FAQs
What is the difference between elastomeric waterproofing coating and regular exterior paint?
Regular exterior paint provides color and limited weather resistance but does not create a true waterproofing membrane. Elastomeric waterproofing coating is significantly thicker, more flexible, and formulated specifically to prevent moisture from penetrating the substrate. It is designed to stretch and recover with building movement, which standard exterior paint cannot do.
How is liquid applied waterproofing membrane different from a sheet membrane?
Liquid applied waterproofing membranes are applied in liquid form and cure into a seamless, fully bonded coating with no seams or laps. A sheet membrane is a pre-manufactured material that is rolled or adhered onto the surface and requires overlapping sections. Liquid membranes conform to complex shapes, penetrations, and transitions more easily than sheet-based systems.
What surfaces work best with elastomeric coating for concrete walls?
Elastomeric coating for concrete walls performs best on clean, structurally sound concrete that has been properly prepared. Surfaces should be free of active leaks, dust, mold, and loose material before application. A primer coat is often recommended on porous or previously uncoated concrete to improve adhesion and coverage.
How long do elastomeric roof coatings last on commercial buildings?
Under correct application and moderate climate exposure, elastomeric roof coatings generally last between ten and twenty years depending on product, dry film thickness, and maintenance frequency. Regular inspections every few years help identify areas that need touch-up before moisture finds a way through. Proper application at the recommended minimum thickness is essential for achieving the full expected service life.
Is acrylic elastomeric coating suitable for UV-exposed commercial walls?
Yes, acrylic elastomeric coating is a reliable choice for UV-exposed exterior walls because it contains UV resistant additives that slow pigment breakdown and surface degradation. It also reflects a portion of UV radiation, which helps reduce heat absorption on sun-facing walls. For maximum UV protection on rooftops, a silicone elastomeric coating is generally preferred by industry professionals.
Can I get a free estimate for elastomeric waterproofing on my commercial building?
Yes. You can request a free waterproofing and coating estimate through the Hello Painting website. A professional will assess your building's surfaces, identify problem areas, and provide a detailed quote for the appropriate waterproofing system.
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