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THE ROOFING EXPERTS IN THE SEATTLE & EASTSIDE AREAS 888-599-8591
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Flat Roofing

Top-Rated Flat Roofing Contractor in Seattle

Flat Roof Repair, Replacement, & Maintenance in King County, Pierce County, Snohomish County, Kitsap County & Surrounding Areas

Whether you are considering installing a flat roofing system or have one already, our expert Seattle-area roof installers can help. Serving Western Washington since 2006, our many years of experience make us a valuable asset when it comes to installing and maintaining your flat roof. Using only the best materials like vinyl roof membranes, we make sure our flat roof installation and repair services are always done right, so customers like you can have the peace of mind you deserve.

Get in touch with our flat roofing contractors in Seattle today at (888) 599-8591 or contact us online to receive a complimentary estimate!

Why We Choose Vinyl for Flat Roof Installation

There are two kinds of vinyl roof membranes: polyvinyl chloride or PVC and thermoplastic polyolefin or TPO. PVC and TPO sheets are made out of flexible plastic materials that are welded together to create a seamless sheet covering for your entire roof. Unlike other materials like wood, these plastic sheets can last 25 years or more with proper maintenance.

Here are some characteristics of heat-welded PVC and TPO sheet roofing:

  • Flexible even in cold weather
  • Class A fire resistant
  • Puncture and tear resistant
  • Holds up well to standing water
  • Chemicals and grease resistant
  • Available in many different colors

Our Comprehensive Flat Roof Installation Process

At Pro Roofing NW, we firmly believe that our experienced greater Seattle area roof replacement contractors are the best in the field. It’s not just the care we take, it’s the techniques we use. For example, one of the problems with PVC and TPO is they don’t breathe, so water vapor is unable to pass through. If the roof is simply covered with a sheet of PVC, as many other flat roof installers do, condensation will get trapped from inside the home and form leaks.

Fortunately, we are the experts when it comes to flat roof installation as well as repair. We follow strict quality and safety protocols to ensure a reliable and efficient flat roofing service.

Our flat roof installation process is as follows:

  • After removing your old roof, we fully remove any rotten or worn foundation and install only with strong and carefully selected material such as vinyl roof membranes
  • We then apply ice and water shield, which is a waterproof but breathable product, to the roof deck
  • We apply a separator sheet designed to absorb small quantities of moisture
  • We place the PVC or TPO sheeting
  • We ensure proper roof ventilation in order to prevent and mitigate the need for costly flat roof repairs later on

Our Western Washington roofing experts install two kinds of vents on flat roofs. One vents the attic under the roof while the other vents the separator sheet, so any water or moisture can easily pass through.

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Flat Roofing FAQ: Answers from Flat Roof Specialists

What are the Benefits of Flat Roofing?

Flat roofs offer several advantages for both residential and commercial buildings. The main benefit is cost savings—flat roofs are cheaper to install and can reduce heating costs since they help retain heat more efficiently than angled roofs.

Flat roofs also provide opportunities for additional uses, like rooftop gardens or lounges, which can enhance property value. They are also ideal for businesses like hospitals that need helicopter access or parking structures that require more space.

While flat roofs have many benefits, it's important to address potential issues early to avoid costly repairs down the line.

Are There Any Common Problems with Flat Roofing to Watch Out For? 

Yes, flat roofs have their own set of common problems and challenges that you should be aware of and watch out for. Regular inspections and proactive maintenance can help prevent these issues from becoming major problems. Here are some common problems associated with flat roofing:

  • Water Ponding: Flat roofs are prone to water ponding or pooling, especially if the drainage system is inadequate or blocked. Prolonged standing water can lead to roof membrane deterioration and leaks.
  • Leaking: Leaks are a significant concern with flat roofs. They can occur due to damaged or deteriorating roofing materials, failed seams, or improperly installed flashing. Regular inspections are essential to catch leaks early.
  • Blistering and Bubbling: Over time, moisture can become trapped between the layers of roofing materials, leading to blistering or bubbling of the roof surface. This compromises the integrity of the roof and can lead to leaks.
  • Flashing Issues: Flashing, which is used to seal roof penetrations (such as vents, chimneys, and skylights), can deteriorate or become loose over time. Damaged or improperly installed flashing is a common source of leaks.
  • Deterioration from UV Exposure: UV radiation from the sun can cause roofing materials to break down over time, leading to cracks, loss of flexibility, and reduced lifespan.
  • Ice and Snow Accumulation: In cold climates, ice dams and snow accumulation on a flat roof can lead to water infiltration and damage when the snow melts and refreezes.
  • Punctures and Mechanical Damage: Foot traffic, dropped tools, or other mechanical damage can puncture the roofing membrane or damage the surface, leading to potential leaks.
  • Lack of Maintenance: Neglecting regular maintenance, including inspections and necessary repairs, can exacerbate all of the above problems and significantly reduce the lifespan of a flat roof.

How Can I Extend the Life of My Flat Roof?

To address the common problems listed above and extend the life of your flat roof, it's essential to have a proactive maintenance plan in place. Regular inspections by a professional roofing contractor can help identify issues early, and timely repairs can prevent more extensive and costly damage. Keeping the roof clean and free of debris, as well as ensuring proper drainage, is crucial for flat roof maintenance.

How Often Should a Flat Roof Be Inspected?

A flat roof should be inspected at least twice a year, ideally in the spring and fall. Regular inspections help catch small issues, like pooling water or cracks, before they turn into bigger, more expensive problems.

Is Flat Roofing Suitable for Seattle’s Climate?

Yes, flat roofing can be effective in Seattle’s rainy climate, but it’s important to choose materials that resist water damage and ensure proper drainage. Regular maintenance, such as clearing debris and checking for leaks, will help keep your roof in good condition. 

Request a Free Estimate for Flat Roof Installation or Repair

Our company is based out of the Seattle area, but we serve other areas throughout King County, Pierce County, Snohomish County, and Kitsap County. If you are considering a flat roofing system in any of these areas, our award-winning flat roofing contractors are available. We will take the time to do your installation right.


Get in touch with our Seattle flat roofing contractors today at (888) 599-8591 or contact us online to receive a complimentary estimate!


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