If you own a home or maintain a commercial building with a flat roof in Utah, you’ve probably wondered at some point, “How long does a flat roof last?” Flat roofs have a distinct appearance, performance, and materials compared to sloped roofs. They also have a minimal slope, typically less than 10 degrees, and are great for outdoor areas.
This article aims to answer your questions and provide information on the types of flat roofs available, as well as their advantages and disadvantages, to help you decide whether a flat roof is a good idea for your home.
What Is Metal Roofing?
A metal roof is made of metal materials, like aluminum, copper, tin, or zinc, and functions like any other type of roof to provide protection. You can get a metal roof in several styles, colors, and finishes to create a unique look on your home.
How Long Does a Flat Roof Last?
Many factors contribute to the lifespan of a flat roof. Everything from weather to the materials used to the type of roof installed impacts the lifespan. On average, expect about 20 years of life from a flat roof. Still, extenuating weather circumstances can make the lifespan shorter. The materials used and regular maintenance of a flat roof can increase the lifespan, though no one can precisely predict how long a roof will last.
How Does Utah’s Weather and Climate Impact Flat Roofs?
Utah’s weather and climate impact the lifespan of flat roofs. Snowy winters in Logan and Park City can leave standing water on roofs if they don’t drain properly, leading to leaks and water damage inside the building. Bright, sunny, dry days in St. George and Moab can eventually lead to roof blistering and cracking due to the high amounts of UV radiation Utah receives. A cracked roof can leak when it rains, causing water damage.
Flat Roof vs. Angled Roofs
Flat and angled roofs (pitched or sloped roofs) have distinct characteristics. They are suitable for different architectural styles and climates. Here are some critical differences between flat roofs and angled roofs:
Flat Roofs:
- Aesthetic appeal: Flat roofs often have a modern and minimalistic aesthetic.
Use of space: Flat roofs can create additional living space for things like rooftop gardens, solar equipment, or outdoor living space. - Cost: Flat roofs are typically more cost-effective compared to angled roofs because they are easier to design and build.
- Maintenance: Maintenance of flat roofs is generally easier as access is straightforward. However, proper drainage is crucial to avoid ponding water.
- Weather sensitivity: Flat roofs are more susceptible to water pooling, and proper drainage is essential. They may also face challenges with snow accumulation.
Angled Roofs:
- Aesthetic variety: Angled roofs offer various design possibilities and are commonly associated with traditional, classic, or regional architectural styles.
- Water drainage: Angled roofs naturally facilitate water runoff, making them less prone to water-related issues such as ponding or leaks.
- Snow shedding: In regions with heavy snowfall, angled roofs allow for snow shedding, reducing the risk of excessive snow load on the roof.
- Weather adaptability: Angled roofs are generally better suited to various weather conditions, including heavy rainfall and snow.
What Type of Roofing is Best for a Flat Roof?
The best type of roofing for a flat roof depends on your climate, budget, and how long you want it to last. EPDM, TPO, and PVC are among the most popular flat roof materials because of their durability, water resistance, and energy efficiency. However, traditional options like BUR and modified bitumen also offer solid protection at a lower cost.
If you’re looking for longevity or energy performance, certain materials clearly stand out.
BUR
A BUR (built-up roof) has layers of bitumen and fabrics, which often have several layers. These provide great insulation and protection against weather events. On average, a BUR roof will last approximately 15 years before signs of wear and tear begin to show.
EPDM
Ethylene propylene diene monomer (EPDM) is made from rubber membranes, providing optimal insulation and protection. If your area is prone to hailstorms, this is the preferred roofing material to protect your home. The approximate longevity of an EPDM roof is 20 years.
PVC
A polyvinyl chloride (PVC) roof is a top consideration when longevity is essential. Compared to other options, a PVC flat roof is extremely water-resistant, meaning it provides excellent protection for your home. This type of flat roof can last around 30 years if it is well-built and maintained correctly.
TPO
Thermoplastic polyolefin (TPO) is a newer flat roof material. These single-ply roofs have a membrane that uses polymer fillers to increase strength and durability. These are great roofs to protect against UV rays. A typical lifespan of TPO roofs is between 15 and 30 years.
Spray-On Coating
A three-layer sprayed-on polyurethane roof coating can provide excellent protection from wind and damaging UV rays. This option can be substantially more expensive than other roof types. When properly maintained, however, this roof type can last for decades.
Modified Bitumen
These roofs are incredibly durable and low-maintenance. A modified bitumen roof provides adequate protection from the elements and is entirely water resistant. When installed correctly, this roof can last around 20 years.
Pros of Flat Roofs
There are several advantages of flat roofs compared to pitched roofs. These advantages include:
- Affordability: Due to easier flat roof installation, they are more affordable than traditional pitched roofs
- Easy to clean: Flat roofs are easier to clean and maintain than pitched roofs. They are safer for the person on the roof, too!
- Versatility: One of the main benefits of a flat roof is that it’s extremely versatile. Grow a garden when you lack yard space, add a fire pit, create a relaxation area, and more.
- Energy efficiency: Flat roofs are more energy-efficient due to the material used and the lack of attic space they create.
- Equipment availability: A flat roof offers more usable space, making it easier to install HVAC units and solar panels.
Cons of Flat Roofs
While flat roofs offer many advantages, there are also disadvantages to consider. Here are a few to help you decide if a flat roof is the right choice for your home:
- Water pooling: Water doesn’t drain easily from a flat roof, resulting in long-term damage.
- Water leakage: Heavy rain and melted snow can often be found in the cracks of a flat roof.
- Weather sensitivity: Flat roofs are commonly exposed to UV rays and heavy snowfall, which can cause cracks and drainage issues.
- Shorter lifespan: Some flat roofs have shorter lifespans and require regular maintenance.
What Are the Risks Associated With Flat Roofs?
The risks associated with flat roofs are mostly related to weather. Since the roof is flat instead of sloped, it is easier for water to gather. This standing water can cause puddles if the roof doesn’t drain properly, which can eventually seep into the roof and cause water damage to the property. If you notice any discoloration spots on your ceiling, it could indicate that there is an undetected leak somewhere in your roof.
Warm temperatures can eventually cause flat roofs to crack and blister. When this occurs, it may be time for a roof repair or replacement.
How to Extend the Lifespan of Your Flat Roof
Proper cleaning and regular maintenance and inspections will help extend your flat roof’s lifespan.
What Is the Cost of a Flat Roof Installation?
The cost of flat roof installation will vary greatly depending on the material used and the size of the project. A roof assessment will provide more information about the best roof for your needs and the associated costs.
What Is the Cheapest Way to Cover a Flat Roof?
EDPM, a synthetic rubber, is one of the most affordable ways to cover a flat roof, especially in sunny Utah climates like Ogden, Layton, or Salt Lake City. This roofing material is lightweight and can last up to 20 years with proper care.
Are Flat Roofs a Good Idea?
Ultimately, flat roofs can be a cost-effective and practical roofing option, especially for modern homes and commercial buildings. They typically cost less to build than pitched roofs, offer easier access for roof maintenance, and create usable space for features like solar panels, HVAC systems, or rooftop patios.
That said, flat roofs aren’t ideal for every climate. They require proper drainage systems and regular upkeep to prevent issues like standing water and roof leaks. Their lifespan can also be shorter than that of sloped roofing systems, especially in areas with heavy rainfall or snow.
Flat roofs work best for:
- Dry or mild climates like Utah’s
- Modern or minimalist architecture
- Buildings that benefit from extra roof space
Not sure if a flat roof is right for you? Talk to a roofing contractor to explore the best flat roofing systems for your location, structure, and budget.
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