Flat Roof Repairs & Leak Solutions

Expert Flat Roof Leak Repair on Long Island

Flat roof systems are durable, but they’re also prone to leaks if not installed or maintained properly. Most flat roof materials last 15–20 years, with commercial-grade applications lasting up to 30 years. However, leaks can occur in as little as 5–10 years due to penetrations at vent pipes, HVAC units, fence posts, or perimeter flashing.

Leak Stoppers Inc specializes in diagnosing and repairing flat roof leaks across Suffolk County, Nassau County, and all of Long Island, ensuring your roof is watertight and backed by our No Leak Guarantee. Contact us today.

Residential Flat Roof Repairsp

• Wall Flashing: The most common residential flat roof leak occurs where roofing meets siding. Traditional flashing materials like copper, aluminum, lead, or tar often fail. Our preferred method is to extend rubber roofing behind all siding layers (vinyl, insulation, asbestos, tar paper), creating a seamless barrier that lasts as long as the roofing material itself.
• Plumbing Pipes & Chimney Stacks: Penetration leaks are easily fixed with trowel-applied flashing, but we go further—using silicone-based sealant with polyester fabric, which lasts 3–4 times longer than traditional tar flashing.
• Perimeter Trim: Many roofers rely on sealants that eventually fail. We use redundant layering with aluminum drip edges and gutters, ensuring edges are wrapped, fastened, and patched for long-term durability.
• Failed Roof Seams: Seams often fail due to poor workmanship, weather conditions, or inferior materials. Our go-to solutions are TPO and Modified Bitumen membranes, which use molecular heat welding for instant, permanent bonding. Unlike peel-and-stick products sold at big box stores, our systems are installed with precision robot welders, ensuring strength even in cold weather.

We also use EPDM roofing for flexibility and tight spaces, though we caution homeowners about its seam prep requirements. EPDM sheets can last 30+ years, making them ideal for specific applications.

Commercial & Industrial Flat Roof Repairs

• Roof Perimeters: Commercial flat roofs often fail at the perimeter. Tar seals eventually break down, allowing water to penetrate between roof layers. Our solution is to extend roofing material 4 inches beyond the edge, overlapping walls or coping, then finishing with aluminum drip edges for a watertight seal.
• HVAC Units & Penetrations: HVAC units are notorious leak points. We reinforce these areas with advanced flashing and waterproofing systems to prevent costly water intrusion.
• Failed Seams: Seams can fail due to building movement, poor fastening, or insulation issues. We don’t just patch the effect—we identify the root cause (deck movement, condensation, or envelope leaks) before making repairs.

Our preferred membranes for commercial roofs are TPO and Modified Bitumen, both heat-welded for maximum durability. EPDM remains an option for flexibility and large sheet coverage, but we recommend TPO for aesthetics and long-term performance.

Why Choose Leak Stoppers Inc

When it comes to flat roof repairs, Leak Stoppers Inc stands out from the competition. Here's why property owners across Long Island trust us:

• 30+ years of roofing expertise
• Specialists in flat roof leak detection and repair
• Licensed and insured in Suffolk & Nassau Counties
• GAF Certified contractors for residential & commercial projects
• Lifetime guarantee on leak repairs
• Affordable financing options available
• Full-service roofing company working with all insurance providers

Our commitment to quality workmanship and customer satisfaction makes us different. We build lasting relationships with our clients while fixing their roofs.

Contact Us today

Flat roof leaks can escalate quickly, leading to structural damage and costly repairs. Don’t wait until water intrusion affects your property. Call Leak Stoppers Inc today for expert flat roof leak repair on Long Island. Our team is ready to respond with proven solutions that protect your home or business.