True Blue Remodeling

The best materials for weatherproofing your new home addition.


Weatherproofing your new home addition is essential for safeguarding it against the elements and ensuring its durability. Choosing the right waterproofing materials is crucial to prevent water damage and leaks, which can compromise the structural integrity and aesthetic appeal of your addition. In this guide, we’ll explore a variety of materials known for their effectiveness in keeping homes dry and secure. Each option offers unique properties that make it ideal for different aspects of construction, from roofs to basements. We will delve into materials such as polyurethane, elastomeric coatings, rubberized asphalt, PVC, and cementitious coatings. Understanding these options will help you make an informed decision to protect your investment. By selecting appropriate waterproofing solutions, you ensure that your home addition remains robust, functional, and beautiful for years to come. Let’s examine the characteristics and benefits of each waterproofing material to determine the best fit for your project needs.


Polyurethane is a top choice for waterproofing new home additions, known for its versatility and strong protective properties. This synthetic resin excels in chemical resistance, making it a perfect barrier against moisture and water damage. It adheres effectively to a variety of surfaces, including concrete, wood, and brick.

A key benefit of polyurethane is its outstanding durability. Unlike some materials that weaken over time, polyurethane maintains its strength even in tough environmental conditions. This quality makes it ideal for moisture-prone areas like basements, bathrooms, and kitchens, where water resistance is essential.

The application of polyurethane creates a seamless barrier that fills cracks and crevices, preventing water ingress. Its flexibility allows it to move with the materials it protects, maintaining a continuous waterproof seal. This adaptability helps avoid cracking or peeling, ensuring long-term protection with minimal need for maintenance.

Polyurethane is also easy to maintain. Once applied, it requires little upkeep, which is a significant advantage for homeowners seeking a low-maintenance option. Its resistance to UV rays and harsh weather conditions makes it suitable for external use, providing protection from rain, snow, and sunlight.

Additionally, the aesthetic flexibility of polyurethane is a significant advantage. It is available in various finishes and colors, allowing homeowners to select an appearance that enhances their home’s design. Whether opting for a glossy finish to accentuate architectural details or a matte look for a subtle integration, polyurethane supports various style preferences.

Choosing polyurethane for your home addition’s waterproofing not only guarantees excellent water resistance and durability but also offers application and aesthetic versatility. It’s a dependable choice that ensures your home is effectively shielded from potential water damage, giving you peace of mind.

Elastomeric Coatings

Elastomeric coatings are a superior choice for waterproofing new home additions, offering exceptional flexibility and durability. These coatings are specifically designed to stretch, making them perfect for surfaces that experience movement or shifting, such as concrete. They form a waterproof barrier that adapts to changes without losing efficacy, ensuring long-lasting protection from water ingress.

Applying elastomeric coatings creates a seamless, air-tight seal that can greatly extend the life of the underlying materials. This characteristic is particularly beneficial for protecting areas that are prone to water exposure, such as exterior walls and roofs. The coatings can bridge small gaps and cracks, preventing any potential water penetration that could lead to damage.

One of the most appealing aspects of elastomeric coatings is their ability to be used both indoors and outdoors. This versatility makes them an excellent option for a wide range of applications in a home addition, from basement walls to outdoor decks. They are also suitable for various climates, providing reliable performance in both hot and cold conditions.

Elastomeric coatings are not only effective but also easy to apply. They can be rolled, brushed, or sprayed onto a surface, allowing for a straightforward application process. Once cured, these coatings are highly resistant to weathering, UV rays, and temperature extremes, which contributes to their durability and low maintenance requirements.

Additionally, elastomeric coatings enhance the aesthetic appeal of structures. Available in various colors and finishes, they can be selected to complement the existing design of a home. Whether you are looking for a finish that stands out or one that blends with the existing architecture, there is likely an elastomeric option to meet your design needs.

Choosing elastomeric coatings for your home addition not only ensures robust waterproofing but also offers flexibility in application and design. These coatings provide peace of mind, knowing that your property is well-protected against the elements, thereby enhancing both the functionality and the appearance of your home.

Rubberised Asphalt

Rubberized asphalt is a highly effective waterproofing material that excels in settings requiring robust durability and resilience. It is commonly utilized in commercial properties, particularly for roofing applications, due to its superior protective qualities against harsh weather conditions.

This material is an amalgamation of asphalt combined with rubber polymers, which enhances its flexibility and crack resistance. Such properties make rubberized asphalt particularly effective in preventing leaks and ensuring the longevity of roofing and other exposed surfaces. It adapts well to temperature fluctuations, maintaining its integrity during both hot summers and cold winters, thereby preventing the common issue of cracking due to thermal expansion and contraction.

Rubberized asphalt’s ability to absorb sound also contributes to its popularity, especially in environments where noise reduction is beneficial. This feature makes it an excellent choice for applications on busy streets or in noisy industrial areas. Additionally, its textured surface can help reduce hydroplaning on roads and walkways, increasing safety for pedestrians and vehicles alike.

Installing rubberized asphalt is a task for professional contractors, as it requires specialized equipment and expertise to ensure a seamless and effective application. Once installed, it forms a continuous waterproof layer that adheres strongly to the base material, whether it’s concrete, metal, or wood.

The durability of rubberized asphalt is one of its most significant benefits, often outlasting the materials it protects. Its robust composition resists environmental damages such as UV rays, ozone, and chemical exposure, which can degrade other materials over time. This long-lasting protection makes it a cost-effective choice for large-scale projects that demand a high degree of waterproofing.

Moreover, rubberized asphalt is low maintenance once applied. It doesn’t require frequent repairs or replacements, which can be both costly and disruptive. Its long service life and minimal upkeep requirements provide a practical solution for enduring protection against water ingress.

Choosing rubberized asphalt for your new home addition can ensure that the structure remains dry and well-protected for years to come, making it a smart investment in the longevity and safety of your property.


PVC, or polyvinyl chloride, enjoys widespread popularity as a waterproofing material due to its exceptional resistance to water and vapor permeability. Roofers frequently use it to protect new home additions from moisture-related damage, particularly in areas that experience heavy rainfall or high humidity.

One key advantage of PVC is that it comes in various forms. Manufacturers produce both reinforced and unreinforced versions to satisfy diverse structural and budgetary needs. Reinforced PVC, enhanced with an additional layer of polyester or fiberglass, offers increased durability and tear resistance, making it ideal for high-stress environments. Meanwhile, unreinforced PVC, though lighter and more flexible, still provides ample protection and is easier to install.

PVC roofing membranes are valued for their longevity and ability to withstand harsh environmental conditions. They resist fire, chemicals, and UV radiation, helping to maintain their integrity and appearance over time. Moreover, PVC is low-maintenance, requiring only occasional cleaning to stay in optimal condition, which reduces ongoing care costs.

The installation of PVC roofing is straightforward yet precise. Installers typically heat-weld the seams to create a continuous, watertight seal that offers maximum protection against water ingress. This method minimizes vulnerabilities and enhances the overall effectiveness of the waterproofing system.

Environmentally, PVC is a sound choice. Many PVC products are recyclable and can be repurposed at the end of their life cycle, contributing to environmental sustainability. This attribute is increasingly important to homeowners who prioritize green building practices.

Additionally, the aesthetic versatility of PVC is a significant benefit. Available in a range of colors and finishes, it can match any home’s exterior decor, offering both functionality and style. Whether you prefer a design that blends seamlessly with your existing roofing or one that makes a bold statement, PVC provides numerous options.

Choosing PVC to waterproof your home addition ensures a durable, effective, and visually appealing solution that will protect your investment for years, making it an excellent choice for any homeowner.

Cementitious Coating

Cementitious coating is a strong waterproofing material valued for its capacity to reinforce and safeguard concrete surfaces, particularly in water-prone areas. This coating consists of cement, sand, and specific chemical additives that boost its durability and moisture resistance. It is especially beneficial in home areas like basements or garages that frequently encounter water.

One key advantage of cementitious coating is its ability to create a hard, durable layer on concrete, which not only waterproofs but also enhances the surface’s resilience. This makes it perfect for areas that endure regular wear and tear, as well as environments with high water tables where moisture intrusion is common.

Applying cementitious coatings is relatively simple. They can be mixed on-site and applied directly to existing concrete surfaces to create a seamless barrier that blocks any water infiltration. Once hardened, the coating forms a solid, waterproof barrier that water cannot penetrate.

Another significant advantage of cementitious coating is its adaptability to various environmental conditions. It performs consistently in both cold and warm climates, maintaining its integrity despite temperature changes. This property ensures durable protection under various weather conditions, making it a flexible choice for diverse locations.

Moreover, cementitious coatings are chemically resistant, which is advantageous in areas exposed to substances like oils, solvents, or acids. This resistance helps preserve the coating’s protective features and prolongs the lifespan of the treated surfaces.

Aesthetically, cementitious coatings can be finished with paint or other coverings to achieve any desired appearance. This adaptability allows homeowners to both safeguard and enhance the visual appeal of their concrete surfaces.

In summary, opting for a cementitious coating to waterproof your home addition provides a practical, robust, and effective solution. It ensures your structure stays dry and well-protected against water damage, contributing to the longevity and upkeep of your property.


Choosing the right waterproofing materials for your new home addition is crucial for ensuring its longevity and structural integrity. Materials like polyurethane, elastomeric coatings, rubberized asphalt, PVC, and cementitious coatings each offer unique benefits for effective protection against moisture and environmental damage. Each option is tailored to address various challenges, including UV resistance, flexibility, chemical resistance, and ease of maintenance. By understanding the specific requirements of your environment and the properties of each material, you can make informed choices to effectively protect your home.

Selecting a waterproofing solution that matches the unique conditions of your project not only secures your investment but also boosts the overall value of your property. A well-protected home resists the elements better, maintains its aesthetic appeal, and offers a safe, dry environment for its inhabitants. Therefore, investing in the proper waterproofing materials is essential to ensure that your home addition remains durable, functional, and attractive for many years to come.