Basement Waterproofing in Freeport, NY

Stop Water Damage Before It Spreads

Permanent basement waterproofing solutions that actually work the first time.

Close up view of a perforated black plastic drainage membrane installed against an excavated dirt trench wall, with sand partially filling the bottom of the trench.

Hear About Us

A house foundation is partially exposed with black waterproofing membrane applied to the concrete wall. Sand and dirt are piled beside the foundation, and construction materials are visible nearby.

Professional Waterproofing Services Freeport

Your Basement Stays Dry Year-Round

You get your basement back. No more moving everything upstairs when storms hit. No more that musty smell that follows you around the house. No more wondering if today’s the day water damage turns into a five-figure nightmare.

Your basement becomes usable space again. Storage that stays dry. A workshop you can actually use. Maybe even extra living space for the family.

The constant worry stops. You know your foundation is protected. Your home value stays intact. Your family breathes cleaner air because there’s no moisture feeding mold growth behind the walls.

Basement Waterproofing Company Freeport NY

We Know Long Island Basements

We handle the basement problems that come with living on Long Island. We’ve seen what coastal weather and older foundations do to homes in Freeport and the surrounding areas.

We’re not the guys who show up, spray some sealant around, and disappear. We’re masonry and waterproofing specialists who understand that your basement water problem has a specific cause – and that cause needs a real solution.

Most of our work comes from referrals because we do it right the first time. We’ve been keeping Freeport basements dry long enough to know what works and what doesn’t.

A person wearing red gloves applies black waterproofing paint to a brick wall using a brush, holding a container of paint with the other hand. The scene appears to be outdoors.

Basement Waterproofing Process Freeport

Here's Exactly What We Do

First, we figure out where your water is actually coming from. Could be foundation cracks, failed exterior waterproofing, poor drainage, or a combination. We don’t guess – we identify the real source.

Then we explain your options. Sometimes it’s interior waterproofing with a drainage system and sump pump. Sometimes it’s exterior work to seal foundation walls properly. Often it’s both, depending on your specific situation and budget.

We handle the work ourselves – no subcontractors learning on your job. You get a clear timeline upfront, and we clean up completely when we’re done. Most importantly, you get a basement that stays dry even during the worst storms Long Island can throw at it.

A black dimpled waterproofing membrane is being installed along the foundation wall of a building, with sand and soil partially covering the lower part of the membrane.

Ready to get started?

Explore More Services

About Diamond Masonry & Waterproofing

Get a Free Consultation

Complete Waterproofing Services Freeport

Interior and Exterior Solutions Available

We handle both interior and exterior basement waterproofing because different problems need different solutions. Interior systems work great for managing groundwater and minor seepage. Exterior waterproofing is necessary when your foundation walls themselves are compromised.

Your specific solution might include foundation crack repair, exterior membrane installation, interior drainage systems, sump pump installation, or basement wall sealing. We use materials designed for Long Island’s soil conditions and weather patterns.

Every job includes a thorough assessment of your drainage situation. Poor grading and clogged gutters cause half the basement water problems we see. We’ll tell you about any exterior issues that need attention, even if we’re doing interior work.

A person wearing camouflage pants and gloves kneels on the ground, preparing to install or cut a rolled sheet of material, possibly for flooring or insulation, indoors. A small torch or burner is visible nearby.
Basement waterproofing costs vary significantly based on your specific problem and the solution needed. Interior drainage systems typically run $3,000-$8,000 depending on basement size and complexity. Exterior waterproofing ranges from $8,000-$15,000 for most homes. Simple crack repairs might only cost a few hundred dollars. The key is getting an accurate diagnosis first – many homeowners waste money on the wrong solution because they didn’t identify the real source of their water problem. We provide detailed estimates that break down exactly what work is needed and why.
It depends on where your water is coming from and your budget. Exterior waterproofing is more comprehensive because it stops water before it reaches your foundation walls, but it’s also more expensive and disruptive. Interior systems are less costly and work well for managing groundwater and minor seepage. Many Long Island homes need both – exterior work to address foundation issues and interior drainage to handle groundwater. We’ll assess your specific situation and recommend the most effective approach for your budget. Sometimes a combination of interior waterproofing with targeted exterior repairs gives you the best value.
Most interior waterproofing projects take 2-4 days depending on your basement size and the complexity of the drainage system. Exterior waterproofing typically takes 3-7 days because we need to excavate around your foundation. Weather can affect exterior work timing, especially during Long Island’s wet seasons. We’ll give you a realistic timeline upfront and keep you updated if anything changes. The actual work moves quickly once we start – most of the time is spent on proper preparation and cleanup. We work efficiently because we know you want your basement back to normal as soon as possible.
Professional basement waterproofing should stop water intrusion permanently when it’s done correctly for your specific problem. However, your home’s drainage system needs occasional maintenance – gutters cleaned, grading checked, and sump pumps tested annually. We design our systems to handle Long Island’s heaviest storms, but no waterproofing system works if water is pouring directly against your foundation from clogged gutters or poor grading. We’ll explain what maintenance your system needs and what you should watch for. Most of our customers never have water problems again after we complete the work.
Yes, we warranty our waterproofing work because we stand behind the solutions we install. Warranty terms depend on the specific work performed – interior drainage systems typically carry longer warranties than exterior sealant applications. We use quality materials designed for Long Island conditions and install everything according to manufacturer specifications. More importantly, we’re a local company that will be here if you ever need service. We’ll explain warranty coverage in detail before starting any work so you know exactly what’s protected and for how long.
Simple crack sealing might be a DIY project if the cracks are small and not structural. However, most basement water problems require proper diagnosis and professional-grade solutions to fix permanently. DIY basement waterproofing products from home improvement stores rarely solve the underlying problem – they just mask symptoms temporarily. Incorrect waterproofing can actually make problems worse by trapping moisture in walls or redirecting water to new areas. Given the potential for expensive water damage, most homeowners find professional waterproofing is worth the investment for peace of mind and guaranteed results.