Basement Waterproofing 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 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 service 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 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 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 service needs 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.

Google Review Logo Bottom

Our Service Area Zip Codes In Long Island NY

Brooklyn NY
Brooklyn, NY 11204
Brooklyn, NY 11209
Brooklyn, NY 11215
Brooklyn, NY 11217
Brooklyn, NY 11218
Brooklyn, NY 11219
Brooklyn, NY 11223
Brooklyn, NY 11228
Brooklyn, NY 11229
Brooklyn, NY 11230
Brooklyn, NY 11231
Nassau County NY
Albertson, NY 11507
Atlantic Beach, NY 11509
Baldwin, NY 11510
Bayville, NY 11709
Bellmore, NY 11710
Bethpage, NY 11714
Carle Place, NY 11514
Cedarhurst, NY 11516
East Meadow, NY 11554
East Norwich, NY 11732
East Rockaway, NY 11518
Elmont, NY 11003
Farmingdale, NY 11735
Farmingdale, NY 11737
Floral Park, NY 11001
Floral Park, NY 11002
Franklin Square, NY
Franklin Square, 11010
Freeport, NY 11520
Garden City, NY 11530
Garden City, NY 11531
Garden City, NY 11599
Glen Cove, NY 11542
Glen Head, NY 11545
Glenwood Landing, NY 11547
Great Neck, NY 11020
Great Neck, NY 11021
Great Neck, NY 11022
Great Neck, NY 11023
Great Neck, NY 11024
Great Neck, NY 11026
Great Neck, NY 11027
Greenvale, NY 11548
Hempstead, NY 11549
Hempstead, NY 11550
Hempstead, NY 11551
Hewlett, NY 11557
Hicksville, NY 11801
Hicksville, NY 11802
Hicksville, NY 11815
Hicksville, NY 11819
Hicksville, NY 11854
Inwood, NY 11096
Island Park, NY 11558
Jericho, NY 11753
Jericho, NY 11853
Lawrence, NY 11559
Levittown, NY 11756
Locust Valley, NY 11560
Long Beach, NY 11561
Lynbrook, NY 11563
Malverne, NY 11565
Manhasset, NY 11030
Massapequa, NY 11758
Massapequa Park, NY 11762
Merrick, NY 11566
Mill Neck, NY 11765
Mineola, NY 11501
New Hyde Park, NY 11040
New Hyde Park, NY 11042
Oceanside, NY 11572
Old Bethpage, NY 11804
Old Westbury, NY 11568
Oyster Bay, NY 11771
Plainview, NY 11803
Point Lookout, NY 11569
Port Washington, NY 11050
Port Washington, NY 11051
Port Washington, NY 11052
Port Washington, NY 11053
Port Washington, NY 11054
Port Washington, NY 11055
Rockville Centre, NY 11570
Rockville Centre, NY 11571
Roosevelt, NY 11575
Roslyn, NY 11576
Roslyn Heights, NY 11577
Sea Cliff, NY 11579
Seaford, NY 11783
Syosset, NY 11773
Syosset, NY 11791
Uniondale, NY 11553
Uniondale, NY 11555
Uniondale, NY 11556
Valley Stream, NY 11580
Valley Stream, NY 11581
Valley Stream, NY 11582
Wantagh, NY 11793
West Hempstead, NY 11552
Westbury, NY 11590
Williston Park, NY 11596
Woodbury, NY 11797
Woodmere, NY 11598
Suffolk County NY
Amagansett, NY 11930
Amityville, NY 11701
Aquebogue, NY 11931
Babylon, NY 11702
Bay Shore, NY 11706
Bayport, NY 11705
Bellport, NY 11713
Blue Point, NY 11715
Bohemia, NY 11716
Brentwood, NY 11717
Bridgehampton, NY 11932
Brightwaters, NY 11718
Brookhaven, NY 11719
Calverton, NY 11933
Center Moriches, NY 11934
Centereach, NY 11720
Centerport, NY 11721
Central Islip, NY 11722
Cold Spring Harbor, NY 11724
Commack, NY 11725
Copiague, NY 11726
Coram, NY 11727
Cutchogue, NY 11935
Deer Park, NY 11729
East Hampton, NY 11937
East Islip, NY 11730
East Marion, NY 11939
East Moriches, NY 11940
East Northport, NY 11731
East Quogue, NY 11942
East Setauket, NY 11733
Eastport, NY 11941
Farmingville, NY 11738
Fishers Island, NY 6390
Great River, NY 11739
Greenlawn, NY 11740
Greenport, NY 11944
Hampton Bays, NY 11946
Hauppauge, NY 11788
Holbrook, NY 11741
Holtsville, NY 00501
Holtsville, NY 00544
Holtsville, NY 11742
Huntington, NY 11743
Huntington Station, NY 11746
Islandia, NY 11749
Islip, NY 11751
Islip Terrace, NY 11752
Jamesport, NY 11947
Kings Park, NY 11754
Lake Grove, NY 11755
Laurel, NY 11948
Lindenhurst, NY 11757
Manorville, NY 11949
Mastic, NY 11950
Mastic Beach, NY 11951
Mattituck, NY 11952
Medford, NY 11763
Melville, NY 11747
Melville, NY 11760
Melville, NY 11775
Middle Island, NY 11953
Miller Place, NY 11764
Montauk, NY 11954
Moriches, NY 11955
Mount Sinai, NY 11766
Nesconset, NY 11767
New Suffolk, NY 11956
North Babylon, NY 11703
Northport, NY 11768
Oakdale, NY 11769
Ocean Beach, NY 11770
Orient, NY 11957
Patchogue, NY 11772
Peconic, NY 11958
Port Jefferson, NY 11777
Port Jefferson Station, NY 11776
Quogue, NY 11959
Remsenburg, NY 11960
Ridge, NY 11961
Riverhead, NY 11901
Rocky Point, NY 11778
Ronkonkoma, NY 11779
Sag Harbor, NY 11963
Sagaponack, NY 11962
Saint James, NY 11780
Sayville, NY 11782
Selden, NY 11784
Shelter Island, NY 11964
Shelter Island Heights, NY 11965
Shirley, NY 11967
Shoreham, NY 11786
Smithtown, NY 11787
Sound Beach, NY 11789
South Jamesport, NY 11970
Southampton, NY 11968
Southampton, NY 11969
Southold, NY 11971
Speonk, NY 11972
Stony Brook, NY 11790
Stony Brook, NY 11794
Upton, NY 11973
Wading River, NY 11792
Wainscott, NY 11975
Water Mill, NY 11976
West Babylon, NY 11704
West Babylon, NY 11707
West Islip, NY 11795
West Sayville, NY 11796
Westhampton, NY 11977
Westhampton Beach, NY 11978
Wyandanch, NY 11798
Yaphank, NY 11980
Queens County NY
Addisleigh Park, NY 11433
Addisleigh Park, NY 11434
Arverne, NY 11692
Astoria, NY 11101
Astoria, NY 11102
Astoria, NY 11103
Astoria, NY 11104
Astoria, NY 11105
Astoria, NY 11106
Bayside, NY 11359
Bayside, NY 11360
Bayside, NY 11361
Bay Terrace, NY 11360
Beechhurst, NY 11357
Belle Harbor, NY 11694
Bellerose, NY 11426
Breezy Point, NY 11697
Briarwood, NY 11435
Broad Channel, NY 11693
Cambria Heights, NY 11411
Chinatown, NY 10013
College Point, NY 11356
Corona, NY 11368
Douglaston–Little Neck, NY 11362
Douglaston–Little Neck, NY 11363
East Elmhurst, NY 11369
East Elmhurst, NY 11370
East Elmhurst, NY 11371
Edgemere, NY 11690
Elmhurst, NY 11380
Far Rockaway, NY 11690
Far Rockaway, NY 11691
Far Rockaway, NY 11692
Far Rockaway, NY 11693
Far Rockaway, NY 11694
Far Rockaway, NY 11695
Far Rockaway, NY 11697
Floral Park, NY 11004
Floral Park, NY 11005
Flushing, NY 11374
Forest Hills, NY 11375
Fresh Meadows, NY 11365
Fresh Meadows, NY 11366
Fresh Pond, NY 11385
Glendale, NY 11385
Glen Oaks, NY 11004
Hollis, NY 11423
Howard Beach, NY 11414
Jackson Heights, NY 11372
Jamaica, NY 11411
Jamaica, NY 11412
Jamaica, NY 11413
Jamaica, NY 11414
Jamaica, NY 11415
Jamaica, NY 11416
Jamaica, NY 11417
Jamaica, NY 11418
Jamaica, NY 11419
Kew Gardens, NY 11415
Kew Gardens, NY 11418
Kew Gardens Hills, NY 11367
Laurelton, NY 11413
Long Island City, NY 11101
Long Island City, NY 11102
Long Island City, NY 11103
Long Island City, NY 11104
Long Island City, NY 11105
Long Island City, NY 11106
Long Island City, NY 11109
Middle Village, NY 11379
Neponsit, NY 11694
Ozone Park, NY 11416
Ozone Park, NY 11416
Pomonok, NY 11365
Queens Village, NY 11427
Queens Village, NY 11428
Queens Village, NY 11429
Rego Park, NY 11374
Richmond Hill, NY 11418
Ridgewood, NY 11385
Rochdale Village, NY 11434
Rockaway Beach, NY 11693
Rockaway Park, NY 11694
Rosedale, NY 11413
Rosedale, NY 11422
Roxbury, NY 12474
St. Albans, NY 11412
South Ozone Park, NY 11420
South Ozone Park, NY 11436
Springfield Gardens, NY 11413
Sunnyside, NY 11104
Whitestone, NY 11357
Woodhaven, NY 11421
Woodside, NY 11377