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October 22, 2019
Local waterproofing contractors add waterproofing barriers to basement walls to prevent water seepage and water leaks.

The Best Waterproofing Contractors in New Haven County CT Are the Ones Proven Safe to Hire

Waterproofing contractors in New Haven County CT bearing The Prime Buyer's Report TOP 10 symbol are ones that have exceeded the minimum Connecticut regulatory standard. They are the waterproofers proven by our independent research to have passed the TOP 10 requirements for value and ability, carry liability insurance as protection for you the customer, who use only employees legal to work in the U.S., and for whom our staff has called previous customers to verify high satisfaction with them as waterproofers in New Haven County CT, including basement waterproofing, French drains, sump pumps, pressure release systems, crawl space waterproofing, and more.

The TOP 10 Waterproofing Contractors in New Haven County CT

Modern Tech Systems Waterproofing

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(203) 596-9372
764 Highland Ave
Waterbury, CT 06708

Areas Served: New Haven CT, Waterbury CT, Meriden CT, Milford CT, Naugatuck,…
Services: leak prevention, leak detection, water sealant services

Foundation Sealers CT LLC

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(203) 281-4155
80 Overlook Dr
Hamden, CT 06514

Areas Served: Meriden CT, New Haven County, Waterbury CT, Branford CT, New…
Services: waterproofing contractors for drainage, dewatering, water sealants

Ware-Cote Corp

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(203) 933-7167
48 Thill St
West Haven, CT 06516

Areas Served: New Haven Conn, New Haven County, East Haven CT, Branford…
Services: waterproofing services incl. wall coatings, water repellents, waterproof membranes

Budget Dry Waterproofing

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(203) 421-8560
800 Village Walk # 266
Guilford, CT 06437

Areas Served: New Haven County CT, Waterbury CT, New Haven CT, Meriden…
Services: cellar dewatering, basement waterproofing, all waterproofing services

A De Luca Basement Waterproofing

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(203) 285-3419
1 Brookfield Rd
East Haven, CT 06512

Areas Served: New Haven County, Hamden CT, West Haven CT, Wallingford CT,…
Services: waterproofing contractors for water seepage, water leaks, cellar waterproofing

Hollfelder Waterproofing LLC

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(203) 318-0691
99 Garnet Park Rd
Madison, CT 06443

Areas Served: New Haven CT, West Haven CT, Wallingford CT, North Haven…
Services: waterproofing incl. sump pumps, drainage

The Best Waterproofing Contractors in New Haven County CT Are the Ones Proven Safe to Hire

The state of Connecticut requires only that waterproofing contractors in New Haven County CT be registered with the state in order to do residential waterproofing with no exam or test of ability or knowledge about waterproofing, so there is no state standard for competency and reliability.

So the state registration for residential waterproofers is no guarantee that any particular company for waterproofing in New Haven County CT is even competent, is doing business honestly, delivering value, or satisfying customers.

This makes it all the more significant that all waterproofing contractors in New Haven County CT who bear The Prime Buyer's Report-TOP 10 symbol have been cleared by our research staff as passing all the requirements for Prime Buyer's Report-TOP 10 status such as survey phone calls to previous customers to verify high satisfaction, good complaint record, verified state registration (for residential waterproofing), worker's comp and liability insurance, only employees legal to work in the U.S., best business practices, and more.

Waterproofing is most effective when done at the time of construction because concrete itself is not watertight on its own.  One approach is the application of waterproof membranes of various materials like bitumen, silicate, or polymer sheets that act as a barrier between the building and the water.  A more recent approach uses additives to the concrete itself, known as integral waterproofing systems. There are two types of integral systems to give concrete a waterproof quality: hydrophilic which replaces the water in the concrete with crystals, and hydrophobic which uses fatty acids to block pores within the concrete, preventing water passage.

But the need for waterproofing contractors in New Haven County CT often involves solving water leaks, water seepage, and flooding in existing structures, especially cellars, basements, and crawl spaces.  

Basement Waterproofing
There are two categories of basement flooding. One is surface water entering the basement from the walls, including windows, wall cracks, pipe penetrations leaks, or basement wall seepage.  The other category is groundwater in the basement through the floor slab, or the cove joint which is where the basement floor and walls meet. This kind of water seepage is referred to as hydrostatic pressure. Good waterproofing contractors will start by determining if the flooding is through the walls or through the floor (hydrostatic pressure) or both.

Basement Flooding from the Walls
Basement water problems are rarely solved by applying waterproof compounds to the interior walls since those interior coatings will degrade over time or can't handle the pressure of water already penetrating the wall.   Cellar dewatering or basement waterproofing is properly done on the exterior, so that water never accumulates around the foundation.   This may include grading the soil to keep water at least 15 feet away, installing a drywell if a downhill slope to the foundation is unavoidable, extending gutter downspouts further away from the walls, and correcting window wells that accumulate water.

Basement Flooding from the Floor Slab (Hydrostatic Pressure)
The amount of ground water can increase with rainfall, causing hydrostatic pressure that pushes water through the cellar floor. The most common solution is installing a drainage system which includes a drainage pipe, gravel or drainage stone, concrete to cover the gravel, and a discharge system consisting of a sump basin and sump pump.   Proper installation of a basement drainage system will prevent seepage by removing water before it rises to the level of the basement floor and divert it to a sump well recessed in the floor where a sump pump discharges it elsewhere.   Basement drainage systems are usually installed along the interior part of the foundation and can be retrofitted into homes when exterior drainage systems fail or don't exist.

Sump pumps ideally should include a battery back-up to prevent failure during power blackouts since storms can be the common source of both rainfall and power outages.

Crawl Space Waterproofing
Originally it was believed that moisture control of crawl spaces was achieved by venting the crawl space to the outside.  More recent experience indicates that crawl space venting leads to moisture problems like mold, rot and insects because the moisture level of crawl spaces fluctuates with the outside humidity, while a closed crawl space remains dry.   For existing crawl spaces, waterproofing a crawl space includes fixing water entry problems, closing off the wall vents, installing a full ground moisture barrier (lining the ground with plastic) inside the crawl space.   The crawl space should not be closed off if there is unresolved water entry or if furnaces or water heaters are supplied with air from the crawl space.  If the hot water heater relief line and drain pan terminate in the crawl space, piping should be added to run these lines to outdoors to prevent overflow from flooding the crawl space.

Installing a crawl space drain will prevent plumbing leaks and water spills from creating standing water on top of the ground moisture barrier (such as ground lining polyethylene). Moldy crawl space air can be prevented from entering the house by sealing floor holes and duct leaks.   Closing the crawl space from outdoors includes sealing wall vent openings with rigid foam and sealing with caulk, expanding foam, or mastic, sealing all wall penetrations for electrical and plumbing, and adjusting the crawl space door or access panel for a tight fit. Sealing a crawl space can reduce moisture levels such that hardwood flooring above it may shrink and show gaps while some previously buckled by moisture have flattened out.   Some waterproofing companies may recommend permanently installing a dehumidifier inside the crawl space.

Full Service Waterproofing  vs One-Size-Fits-All
Many waterproofing contractors offer only one kind of solution, or their own patented system.  If your own research or an independent inspection has already determined that's exactly the kind of waterproofing you need, then it can make sense to hire that company.  But if you have not determined yet the exact cause of the problem and the right approach, then a company that sells only one kind of waterproofing might not be the best option.  Some waterproofing contractors are "full service" meaning they provide multiple options and approaches and can recommend one based on an inspection of your property and determination of the exact causes of water seepage or water leaks in your case.   And remember, cheap waterproofing has not saved you any money when it fails to work,  so think long term, and look for written guarantees which can be anywhere from several years, decades or a lifetime warranty. 

Some Waterproofing Contractors in New Haven County Are A Better Value Than Others
The Prime Buyer's Report lists these contractors for waterproofing in New Haven County CT: . Other waterproofing companies in New Haven County CT that might still be in business include: .


Questions to Ask Waterproofing Contractors in New Haven County CT

When it comes to waterproofing in New Haven County CT, ask them these questions about their abilities, experience, and credentials:

• How long have they been waterproofing in New Haven County specifically? (Different areas can have unique soil conditions, water table and rainfall issues that it helps to be experienced with.)

• Do they provide only one type of waterproofing? What types don't they provide?

• In the case of basement waterproofing, do they do exterior work or only interior? If they do basement drain systems, are they above the footing (might be less effective) or sub-floor (below the slab).

• How many other waterproofing jobs have they done of the exact type you're seeking (sub floor interior drains and sump pumps, soil grading, liquid sealants, etc).  Different types of waterproofing requires different skills, tools, and experience.

• Can the waterproofing company give you names and numbers you can call as references? (All waterproofing contractors bearing the Prime Buyer's Report-TOP 10 symbol have already had their customer references called by our research staff so you don't have to.)

• How do they determine pricing?

• Will they be performing every stage of the work or do they use subcontractors?

• Is there a written guarantee, for how many years, and what are the terms?

•  Can the waterproofing contractor vouch that all their employees sent to your property are legal to work in the U.S.? (All waterproofing companies  bearing The Prime Buyer's Report-TOP 10 symbol have already signed an agreement to only hire documented workers.)

• Do they have active workers' compensation and general liability insurance? (All waterproofing contractors bearing The Prime Buyer's Report-TOP 10 symbol have already had proof of insurance verified by our research staff so you don't have to.)

• What inspection work will they do before preparing an estimate?

• How long will it take and does the waterproofing company give any kind of guarantee of completion by your deadline date?

• How well do they know their crews? Do they personally hire and train their crews, or do they bring them in from the outside on a project-by-project basis?

When you've chosen the best waterproofing contractor in New Haven County CT for your needs, make sure they are registered with the state of Connecticut which is required by law if the waterproofing is residential. (All waterproofing companies bearing the Prime Buyer's Report-TOP 10 symbol have already had their state registration verified by our research staff so you don't have to.)

Resources About Waterproofing in New Haven County CT

The following is a list of trade associations and publications related to waterproofing contractors.

Regulatory Bodies & Trade Associations for Waterproofing in New Haven County CT

Basement Health Association

The Waterproofing Contractors Association

SWRI (Sealant Waterproofing and Restoration Institute)

LRWA (Liquid Roofing & Waterproofing Association)

SWA (Sealant and Waterproofing Association)

NAWSRC (National Association of Waterproofing and Structural Repair Contractors)

Publications for Waterproofing Companies in New Haven County CT

Applicator Magazine

Clear Water Repellent Manual

Waterproof Magazine

Architectural Roofing & Waterproofing Magazine


If you are looking for weatherproofing or waterproofing, The Prime Buyer's Report provides information for the TOP 10 Waterproofing Contractors in New Haven County CT within the following zip codes:

6478, 6514, 6532, 6716, 6477, 6513, 6525, 6712, 6473, 6512, 6524, 6710, 6472, 6511, 6519, 6708, 6471, 6510, 6518, 6706, 6492, 6517, 6705, 6770, 6488, 6516, 6704, 6762, 6483, 6515, 6702, 6720, 6450, 6443, 6437, 6418, 6410, 6405, 6461, 6403, 6460, 6401 and 6451

The Prime Buyer's Report provides information for the TOP 10 Waterproofing in New Haven County CT within the following cities:

Ansonia, Cheshire Village, Derby, East Haven, Heritage Village, Meriden, Naugatuck, New Haven, North Haven, Orange, Waterbury, West Haven, Woodmont, Beacon Falls, Bethany, Branford, Cheshire, Guilford, Hamden, Madison, Middlebury, Milford, North Branford, Oxford, Prospect, Seymour, Southbury, Wallingford, Wolcott and Woodbridge