Basement Waterproofing Services and More in Long Island, NY

FREE Estimate

High-Quality Products

Cost Effective

Trusted and Reliable

20+ Years of Experience

Licensed, Bonded & Insured

30 Years of Warranty

5 Star Service

100% Customer Satisfaction

In the Long Island communities of NY, Zavza Seal, a locally-owned and operated general contractor, offers exceptional basement waterproofing services.
Get a FREE Basement Waterproofing Estimate Now!

Keeping Your Home Dry is Our #1 Priority

Finding the Right Basement Waterproofing Services Solution

When it comes to ensuring the longevity and safety of your home, key factors like foundation integrity, insulation quality, and protection against water damage play a crucial role. At ZAVZA SEAL LLC, your trusted basement waterproofing services provider in Long Island, NY, we understand the importance of a solid foundation and a well-maintained basement. With over 20 years of experience in the industry, we have been delivering high-quality solutions to homeowners throughout the region.

Our Comprehensive Services:

Basement Waterproofing: A dry and secure basement is essential for preventing water damage, mold growth, and structural issues. Our expert team employs advanced techniques and high-quality products to ensure your basement remains dry and free from leaks.

Foundation Maintenance: A strong foundation is the backbone of your home. We offer foundation inspection, repair, and maintenance services to ensure your property remains stable and safe for years to come.

Crawl Space Protection: Don’t overlook your crawl space – it’s another critical area of your home. We provide crawl space encapsulation and insulation services to enhance energy efficiency and prevent moisture-related problems.

Insulation Solutions: Proper insulation is key to maintaining a comfortable indoor environment while reducing energy costs. We offer insulation installation and replacement services to keep your home cozy and efficient.

Mold Remediation: If you’re dealing with mold issues, our experienced team can help. We assess the extent of the mold problem, provide thorough remediation, and implement measures to prevent future growth.


  • FREE Estimate: We understand that every home is unique. That’s why we offer a complimentary estimate tailored to your specific needs.
  • High-Quality Products: We only use the best materials and products to ensure long-lasting results for your home.
  • Cost-Effective Solutions: Our basement waterproofing services are designed to provide value for your investment, offering effective solutions at competitive prices.
  • Trusted and Reliable: As a locally-owned and operated general contractor, we take pride in our reputation for reliability and professionalism.
  • Licensed, Bonded & Insured: Your peace of mind matters to us. We are fully licensed, bonded, and insured to provide you with a worry-free experience.
  • 30-Year Warranty: We stand behind our work. Our services come with a 30-year warranty, demonstrating our commitment to quality and durability.
  • 5-Star Service: We prioritize customer satisfaction above all else, aiming for excellence in every aspect of our work.

Experience the ZAVZA SEAL Difference:

Join countless satisfied homeowners in Long Island, NY, who have entrusted ZAVZA SEAL LLC with their basement waterproofing services and home maintenance needs. Don’t wait until water damage or mold becomes a problem – take proactive steps to protect your investment today.

Contact Us for Your FREE Basement Waterproofing Estimate: Call (631) 980-1800
Your Home’s Foundation – Our Priority.

Interior Waterproofing

Waterproofing a basement from the interior is the best option for most homes because it is more affordable and less intrusive than excavating on the outside. Digging a trench around the inner perimeter of the basement floor, building a drain, and adding a sump pump are all parts of an internal drainage system, often known as a French drain. Our basement waterproofing system diverts water from leaks in the walls and where the floor and walls meet to a sump pump that removes the water from the basement using a buried drainage channel.

Exterior Waterproofing

A French drain is often installed underground, and polymers and membranes are applied to the exterior of the walls. Sometimes both techniques are used to waterproof a foundation from the outside. Exterior drainage efficiently waterproofs a basement correctly, but costs are involved. The cost and likelihood of blockage are the two main drawbacks. First of all, excavation is pricy and very disruptive. Exterior drains have the additional drawback of being prone to clogging, which may result in a flooded basement.

The source of the issue and your budget will ultimately determine which basement waterproofing option is ideal for you if your property exhibits indicators that the basement needs waterproofing.

Get the Right Solution

For years, Zavza Seal LLC has provided exceptional basement waterproofing services to Long Island residents. Our team of skilled experts has the experience and knowledge necessary to diagnose and resolve any basement water problems, providing customized, long-term solutions that address the unique requirements of each client’s home.

The company’s localized approach reflects its understanding of the unique challenges of waterproofing services in Long Island. We consider each home’s specific climatic and soil conditions, ensuring that the waterproofing solution provided is designed to last and keep basements dry and safe for years to come.

Whether dealing with a minor leak or a major flooding issue, Zavza Seal’s team is equipped to handle any basement waterproofing services project for Long Island homeowners. To know more about how our team can assist you in safeguarding your home from basement water problems, don’t hesitate to contact us and receive a free estimate today.

Our Basement Waterproofing Services Include:

At our company, we offer following professional basement waterproofing services to help protect your basement, foundation or crawl space from water damage caused by excessive groundwater or flooding.

French Drain Installation

A French drain is a popular and efficient solution for managing excess water and preventing issues such as basement flooding, water damage to foundations, and waterlogged landscapes.

Waterproofing Cement

Waterproofing cement is a specialized formulation that creates a barrier against water penetration, making it an ideal solution for various applications such as basements, foundations, roofs, and concrete structures.

Basement Cracks Repair

Basement cracks can be a common problem in both old and new homes, and if left untreated, they can lead to significant structural damage and water infiltration.

Sump Pump Installation

A sump pump is an essential component of any effective waterproofing system, as it helps to collect and redirect water away from your property, keeping it dry and safe.

Egress Window Installation

An egress window is a large window designed to provide a safe exit in case of an emergency and to allow natural light into your basement.

Basement Insulation

Proper insulation in the basement is crucial for maintaining a stable indoor environment, reducing energy consumption, and protecting your home from potential damage caused by moisture and temperature fluctuations.

Basement Finishing

Whether you’re looking to create a cozy family room, a home office, an entertainment space, or an extra bedroom, our basement finishing services are tailored to meet your specific needs and preferences.

Basement Remodeling

Whether you want to create a cozy family room, a home theater, a guest suite, a playroom, or a personal gym, our team is experienced in turning your basement remodeling dreams into reality.

Basement Waterproofing FAQs:

Basement Waterproofing FAQ (Frequently Asked Questions) is a comprehensive guide that aims to address common queries and concerns related to basement waterproofing. This resource provides valuable information to homeowners, contractors, and anyone seeking to understand the importance, process, and benefits of basement waterproofing.

Will basement waterproofing fix existing water damage in my basement?

Basement waterproofing is primarily aimed at preventing future water damage rather than fixing existing damage. While it can help mitigate the risk of future leaks and moisture problems, it may not directly address the damage that has already occurred. If you have existing water damage in your basement, it is important to address it separately. The specific approach to repair and restore the damage will depend on the extent and nature of the water damage. It may involve removing and replacing damaged materials, drying out the space, addressing mold or mildew growth, and implementing appropriate repairs or renovations. It’s recommended to consult with professionals experienced in water damage restoration to assess the situation and determine the necessary steps to rectify the existing damage.

What are the common causes of basement leaks?

Common causes of basement leaks include poor waterproofing, cracks in foundation walls, faulty or insufficient drainage, plumbing leaks, poorly sealed windows or doors, subsurface water, basement window wells, and condensation. These issues can allow water to infiltrate the basement, leading to moisture problems and potential damage. Properly addressing these causes often involves implementing effective waterproofing measures, repairing foundation cracks, improving drainage systems, fixing plumbing issues, sealing openings, and managing humidity levels in the basement.


Can I install a sump pump as part of my basement waterproofing system?

Yes, installing a sump pump is a common component of basement waterproofing systems. The sump pump is typically equipped with a float switch that activates the pump when the water level in the sump pit reaches a certain point. By incorporating a sump pump into your basement waterproofing system, you can enhance its effectiveness in preventing water damage and maintaining a dry basement environment.

Will basement waterproofing fix foundation settlement or structural issues?

Basement waterproofing typically focuses on addressing issues related to water intrusion and moisture management rather than directly fixing foundation settlement or structural issues. While some waterproofing measures, such as sealing cracks in the foundation walls, can help mitigate water infiltration resulting from settlement cracks, they do not fix the underlying structural problem.

Foundation settlement and structural issues require separate assessment and repair by a qualified foundation contractor or structural engineer. These professionals can evaluate the extent of the settlement or structural damage and recommend appropriate repair methods, which may involve techniques like foundation underpinning, helical piers, or wall stabilization systems. It’s essential to address foundation settlement or structural issues properly to ensure the long-term stability and integrity of the building.

What services do you offer for basement waterproofing?

We provide a range of services, including interior and exterior waterproofing, foundation crack repairs, sump pump installations, basement drainage systems, and basement sealing solutions.

Can basement waterproofing prevent water damage during heavy rainfall?

Yes, basement waterproofing is designed to prevent water damage during heavy rainfall. It helps divert water away from your foundation, keeping your basement dry and protected.

How much does basement waterproofing cost?

The cost of basement waterproofing can vary widely depending on several factors, such as the extent of the water damage, the size of the basement, the location, and the chosen waterproofing method.

Interior waterproofing methods, such as sealants and drainage systems, are typically less expensive than exterior solutions.

Exterior waterproofing methods, which involve excavating the soil around the foundation and applying waterproof membranes, can be more costly.

Call us now to assess your specific situation and provide accurate cost estimates.

How can I ensure proper drainage around my foundation to prevent water issues?

To ensure proper drainage around your foundation and prevent water issues, consider the following measures:

  1. Grade the landscape away from the foundation.
  2. Install downspout extensions to divert water away from the foundation.
  3. Clean and maintain gutters for proper water flow.
  4. Consider installing French drains for excess water management.
  5. Apply a waterproofing membrane to the foundation walls.
  6. Avoid planting large-rooted vegetation near the foundation.
  7. Install window well covers.
  8. Regularly inspect for signs of water intrusion and address issues promptly.

If you have any questions or concerns about finding the most suitable drainage solutions for your specific situation, please don’t hesitate to reach out. Our team of professional landscapers, drainage contractors, and foundation specialists is here to provide expert guidance and tailored recommendations to address your property’s unique needs. Feel free to contact us for assistance.

Is it possible to waterproof an existing finished basement?

Yes, it is possible to waterproof an existing finished basement. While it can be more challenging compared to waterproofing an unfinished basement, there are methods and techniques that can be employed to mitigate water issues and protect a finished basement from moisture damage.

What should I do if I notice water seepage or leaks in my basement after waterproofing?

If you notice water seepage or leaks in your basement after waterproofing, it is crucial to promptly address the issue.

Check for any maintenance issues with your gutters, downspouts, and drainage systems, ensuring they are clear of debris and functioning properly. Taking swift action will help identify and resolve the source of the water seepage, preventing further damage to your basement.


Will basement waterproofing eliminate musty odors in my basement?

Basement waterproofing can help reduce or eliminate musty odors in your basement, but it may not be the sole solution. Musty odors are often caused by excessive moisture or the presence of mold and mildew, which can result from water infiltration or high humidity levels. While waterproofing measures can help prevent water seepage and reduce moisture, additional steps may be necessary to address existing musty odors. These may include improving ventilation, using dehumidifiers, removing any existing mold or mildew, and ensuring proper drainage and airflow in the basement. If musty odors persist after waterproofing, it may be beneficial to consult with professionals experienced in mold remediation and indoor air quality to identify and address the underlying causes.

Are there any environmentally friendly options for basement waterproofing?

There are several environmentally friendly options available for basement waterproofing. These include exterior excavation and drainage systems that redirect water away from the foundation, interior water management systems that capture and remove water that enters the basement, exterior waterproof coatings formulated with eco-friendly materials, French drains that collect and redirect water, and sustainable landscaping techniques that promote natural drainage. By opting for these eco-conscious methods, homeowners can effectively waterproof their basements while minimizing the use of harmful chemicals and reducing their environmental impact. Consulting with a professional basement waterproofing contractor will help determine the most suitable and environmentally friendly solution for individual needs.

What steps should I take if I discover water in my basement?

What steps should I take if I discover water in my basement?

Are there any long-term benefits of basement waterproofing besides water protection?

Yes, basement waterproofing offers several long-term benefits beyond water protection. These include preventing structural damage to your home’s foundation, reducing the risk of mold and mildew growth, improving indoor air quality, and increasing the overall value of your property.

Why Hire Us?

We focus only on waterproofing and insulation services


We focus only on waterproofing to ensure you work only with the best

We use only high quality products for basement waterproofing

Quality Products

We use only high quality materials to ensure years of uncompromising performance

Our basement waterproofing service is very cost effective

Cost Effective

We deliver quality waterproofing service at reasonable prices

We provide five star services

5 Star Service

Our team is committed to delivering 100% customer satisfaction

What’s Next?

Request a free estimate

Request a Consultation

Schedule a consultation now and share with us your needs

Schedule a consultation

Schedule a Meeting

We set up a phone call and a subsequent meeting on location to understand the size of your project

Request a quote / contract

Quote / Contract

We deliver a quote for your work and if you agree provide a contract to start the job

We do the service requested


Our team of experts performs the work on location

100% customer satisfaction assured

100% Satisfaction

Our project manager ensures you are completely satisfied with the results

5 Star Google & Home Advisor Reviews

100% Google's Five Star Reviews
100% Home Advisor Five Star Reviews


Five Stars Reviews 1

Annette Casatelli

I received a few quotes to get the walls in my home filled in with blown in insulation. Zavza Seal was affordable and they did an excellent job.

They were very concerned with cleaning up, which I appreciated. I felt the difference in my home immediately. No more freezing cold walls. I recommend them, hands down.

Five Stars Reviews 2

Noemi Herles

Our experience with Zavza Seal was wonderful and smooth. The crew is well organized. They listen to your plans. They showed out in time. They left everything clean. They did an amazing job! I highly recommend this company.

Five Stars Reviews 3

Ellen Szuchmacher

Efficient, courteous and responsible workers. The job was quoted as being completed in 2 days but more work was required and they returned on the 3rd day and completed the job without additional charges. They reinsulated my crawlspace (not an easy job). I recommend Zavza Seal without reservation.

Five Stars Reviews 4

Michael Rutigliano

Couldn’t be more satisfied with the job Zavza Seal did. Brendan and Jake were accommodating, fair and extremely knowledgeable. Their team worked incredibly hard that day under difficult conditions and did a great job. I manage a multi-unit HOA and we will definitely be using them again.

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Our Services Area Zip Codes in New York:
Brooklyn, Queens, Long Island

Brooklyn NY
Nassau County NY
Suffolk County NY
Queens County NY