Deck Waterproofing Services: Types & Benefits Explained

Throughout the year, decks are exposed to UV rays, water, spills, and foot traffic, all of which can take a toll on your decking materials. Whether you have a wood deck, a concrete deck, or a tile deck, professional deck waterproofing services can ensure its longevity as well as improve the appearance and safety level.

Deck Waterproofing?

Deck waterproofing prevents water from penetrating the surface of a deck, which can damage the structure beneath. There are several different options for homeowners to consider, including deck sealing, deck coating, or the application of a full waterproofing system. Let’s take a quick look at each option, as these terms often are confusing for homeowners.

• Deck Sealing – This refers to the application of a clear or penetrating product that helps repel moisture. This option offers limited protection and may need frequent application.
• Deck Coatings – With coatings, a waterproofing contractor adds a thicker layer on top of the deck surface. Waterproof deck coatings improve the durability of your deck, as well as offering moisture resistance. These can be a great option for decks not built above a structure or for swimming pool decks, and we do offer expert pool deck coating services, including decorative coatings, textured coating, and cool deck coating.
• Full Deck Waterproofing Systems – These include special waterproofing membranes and multiple layers designed to fully block water intrusion. Opting for a complete system is the best option for elevated decks or for decks built above living spaces, such as a roof deck or balcony.

Who Needs Deck Waterproofing?

If you have a deck, a waterproof deck coating or a waterproofing system offers a high level of protection, and we recommend professional deck waterproofing services for any of the following:

• Homeowners with balconies or elevated decks
• HOAs managing multi-unit residential properties
• Apartment complexes and condominiums
• Restaurants or commercial buildings with rooftop decks
• Any structure where water intrusion could damage interior spaces

Even if you have a ground-level deck, using a professional waterproofing company is recommended because our intense sun and heavy winter rains can damage any type of deck material. Coatings or waterproofing systems can protect your investment and keep it looking its best. Pool deck coatings, concrete deck coatings, and wood deck coatings can be a great, cost-effective way to preserve the life of your deck.

DIY Vs. Professional Installation

Because waterproofing protects structural components, opting for professional deck or balcony waterproofing significantly reduces the risk of costly repairs later. Proper surface preparation and product selection are essential. If a membrane is installed incorrectly, water can seep through seams, cracks, or flashing details. Over time, this can lead to hidden structural damage.

Professional waterproofing contractors understand:

• How to prepare surfaces for maximum adhesion
• How to properly seal joints, drains, and transitions
• Which system is appropriate for the climate and traffic level
• Local building code requirements for elevated decks

Types Of Deck Waterproofing Systems

There are several types of deck waterproofing systems. Each is designed for specific conditions, climates, and traffic demands. 

Cementitious Waterproofing Systems

Cementitious systems are cement-based coatings that bond to concrete surfaces. They are commonly used on concrete decks and provide a durable, textured finish.

These are often recommended for:

• Ground-level concrete decks
• Pool decks
• Patios exposed to moderate moisture

These systems are cost-effective, breathable, and can provide a slip-resistant texture. They can also improve the appearance of your concrete deck or walkways. However, these are not ideal for decks built over living spaces, and they are less flexible than membrane systems. They also may not be able to bridge larger cracks.

Liquid-Applied Membrane Systems

Liquid-applied membranes are rolled or sprayed onto the surface, where they cure into a flexible, seamless waterproof layer. These elastomeric coatings expand and contract with temperature changes, helping prevent cracking. Because they are applied as a liquid, there are no seams that can allow water penetration. They also offer exceptional crack-bridging flexibility because they can stretch slightly to accommodate minor structural movement. 

These systems are best for:

• Elevated decks
• Balconies
• Rooftop areas
• Decks over interior spaces

Sheet Membrane Waterproofing

Sheet membrane systems use pre-manufactured waterproof layers that are installed beneath tile or surface finishes. We often use these when tile or stone is installed on top of a deck, as these systems may include multiple protective layers and reinforcement. Additionally, these membranes are frequently required where building codes demand reliable waterproofing over occupied spaces. 

These are highly reliable when installed correctly and offer excellent long-term protection. But, this is quite labor-intensive and does require skilled installation (We are experts at this type of installation.) 

Traffic Coating Systems

Traffic coating systems are specifically designed to handle regular foot traffic while maintaining waterproof protection. They are thicker and more durable than simple coatings and often include textured finishes to improve safety. These coatings are also available in various colors and finishes to enhance appearance.

Common uses:

• Apartment walkways
• Commercial balconies
• Rooftop decks
• HOA properties

Polyurethane or Polyurea Systems

These high-performance systems are known for strength and flexibility. These materials are resistant to abrasion, chemicals, and heavy use. When professionally installed, they can last many years with proper maintenance, and some of these products cure quickly, which reduces downtime and allows you to use the deck again more quickly. 

These systems are best suited for:

• High-traffic environments
• Decks exposed to harsh weather
• Projects requiring premium performance

4 Key Benefits Of Deck Waterproofing

At Thome Waterproofing, we can provide you with quality deck coating or a complete waterproofing system, depending on your needs. While protecting your decking materials is the main reason for hiring us for deck waterproofing services, there are many other benefits, including:

1. Waterproofing Protects Adjacent Structures

If you have a deck or balcony that rests above a structure, water can seep through a poorly waterproofed deck and damage the ceiling below and the walls adjacent to the deck. These leaks often are mistaken for roof leaks when they’re actually coming from the deck. A full waterproofing system, along with proper drainage, can ensure that your deck is water-tight and won’t damage other parts of your property.

2. Waterproofing Improves Structural Integrity

Whether you are a homeowner or manage an apartment community where the units include decks, proper waterproofing not only prevents leaks but also helps to maintain the structural integrity of these decks, ensuring that the structures remain sturdy and safe.

3. Waterproofing Increases Safety

When we apply waterproofing materials, we can provide a skid-resistant texture that can help prevent slips and falls when decks or walkways are wet. This is especially important with walkways and pool decks, and we often provide this service for commercial properties or for homeowners who have pool decks.

4. Waterproofing Improves Your Deck’s Appearance

Decks, balconies, and walkways can be beautiful features, and waterproofing ensures that these structures look their best. We have many decorative coatings and color options that can boost the look of your entire property.

Thome Waterproofing: Serving Los Angeles County & Beyond

No matter what type of deck waterproofing services you need, the team at Thome can provide you with quality waterproofing that protects and beautifies your deck. We also offer all types of foundation waterproofing, including crawlspace waterproofing. Our team proudly serves residential and commercial clients throughout L.A. and Ventura counties. Contact us at anytime for a free cost estimate.