Your Roof, Our Craft

Commercial Flat Roof Replacement

 Flat Roof Replacement for Protection and Value

Commercial Flat Roof Replacement.

If you are suspicious your flat roof is damaged, don’t wait to find out. Flat roofs are notorious for underlying damage due to water pooling caused from their flat shape. Replacing a flat roof in New York starts with removing the old roofing materials to get a clear view of the roof deck and address any hidden damage. Once the deck is repaired, we install new insulation and apply a durable roofing membrane (such as EPDM, TPO, or PVC.) This process not only maintains a watertight seal but also improves overall durability and performance. Whether you’re dealing with frequent leaks or an aging roof, a flat roof replacement can offer a fresh start with long-lasting benefits.

Choose us for flat roof replacement in New York:

  • 10 Years of Expertise
  • Knowledge in Both Roofing and Waterproofing
  • 24/7 Emergency Repairs
  • Same-Day Roof Fixes
  • Local Roofing Knowledge
  • Reliable & Fast Service
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Flat Roof Replacement by Dr. Roof & Waterproof

At Dr. Roof and Waterproof, we take flat roof replacement in New York to the next level. Our expertise in both roofing and waterproofing means we don’t just lay down a new roof; we create a comprehensive solution that stands up to New York’s toughest weather. Using top-quality materials and state-of-the-art techniques, we replace your old roof with one that is both durable and energy-efficient. Trust us to deliver a flat roof replacement that offers exceptional protection and performance for years to come.


  1. Roof Size: Larger roofs cost more. Prices typically range from $3 to $10 per square foot.
  2. Material Choice: Different materials have different costs:
    • EPDM (Rubber): $4 to $8 per square foot
    • TPO (Thermoplastic Olefin): $5 to $9 per square foot
    • PVC (Polyvinyl Chloride): $6 to $10 per square foot
    • Modified Bitumen: $3 to $6 per square foot
  3. Labor Costs: Skilled labor in New York can range from $50 to $150 per hour.
  4. Roof Deck Condition: Repairs to the roof deck can add $500 to $2,000.
  5. Insulation: Adding insulation can cost $1 to $3 per square foot.
  6. Removal of Old Roof: Removing old roofing material can add $1 to $2 per square foot.
  7. Permits and Inspections: These can add several hundred dollars to the total cost.

Estimated Total Cost

For an average-sized roof (1,000 to 2,000 square feet), the total cost to replace a flat roof can range from $5,000 to $20,000 or more. For an accurate estimate, get a detailed quote from a professional roofing contractor.

In many cases, it is possible to install a new flat roof over an existing one, but there are several factors to consider:

  1. Building Codes: Local building codes may limit the number of layers of roofing material that can be installed. Typically, only one additional layer is allowed.

  2. Roof Condition: The existing roof must be in relatively good condition. If there are significant issues like extensive water damage, mold, or structural problems, it’s better to remove the old roof first.

  3. Weight Considerations: Adding a new layer increases the weight on the roof structure. Ensure that the building can support the additional weight without compromising structural integrity.

  4. Surface Preparation: The existing roof must be properly prepared. This includes cleaning, repairing any minor damages, and ensuring the surface is smooth and even to avoid issues with the new roofing material.

  5. Moisture and Ventilation: Ensure there are no trapped moisture issues. Proper ventilation must be maintained to prevent condensation buildup between the layers.

  6. Warranty Concerns: Some roofing material manufacturers may not honor warranties if their products are installed over an existing roof. Check the warranty terms before proceeding.

When to Avoid Overlaying

  • If the existing roof has multiple layers.
  • If there is significant damage or the underlying structure is compromised.
  • If there are concerns about the additional weight on the building structure.

A damaged flat roof can show several signs:

  • Ponding Water: Persistent water pools after rain.
  • Blisters/Bubbles: Raised areas from trapped moisture.
  • Cracks/Splits: Visible cracks in the roofing material.
  • Worn Membrane: Thinning or peeling protective layer.
  • Damaged Flashing: Cracked or loose flashing around vents and edges.
  • Mold/Mildew: Indications of moisture penetration.
  • Sagging Areas: Sunken sections suggest structural issues.
  • Stains: Discolored patches on the roof or ceilings.
  • Soft Spots: Spongy areas indicating rot or water damage.
The most common issue with flat roofs is ponding water. This occurs when water collects in puddles on the roof and does not drain properly. Over time, this standing water can lead to several problems. Prolonged exposure to water can deteriorate the roofing material, leading to membrane damage. Water can also seep into the building, causing leaks and interior damage. Additionally, the added weight of the water can put stress on the roof structure. Persistent moisture can promote mold and mildew growth, which can affect indoor air quality. To prevent ponding water and maintain a healthy flat roof, it is essential to address drainage issues and ensure proper roof slope.
I’m impressed with the comprehensive roof maintenance program offered by Dr. Roof and Waterproof. They’ve helped extend the life of my roof with their meticulous inspections and maintenance services. It’s a five-star experience every time!
Carlos G
The waterproofing service provided by Dr. Roof and Waterproof for our Queens estate was top-notch. Their team was knowledgeable, courteous, and the results speak for themselves. No more leaks, just flawless, professional work.
Sophia R
Running a business in Brooklyn means dealing with the elements, and Dr. Roof and Waterproof has been our go-to for all our commercial roofing needs. Their swift response and exceptional work have kept our operations smooth, rain or shine.
Michael T

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