Are you considering putting up a commercial property and wondering if a flat roof is right for you? There has been an increase in the popularity of flat roofs in recent years, but there are still some misconceptions about them. In this post, Gold Star Roofing LLC will dispel some of those myths and give you the information you need to decide whether a flat roof is right for your business.
Before going any further, it’s important to understand commercial flat roofs.
Contents
What Is A Commercial Flat Roof?
Flat roofs are roofs with a pitch of less than 10 degrees. They are also sometimes called low-slope roofs. While they may not have a lot of slope, they are designed to drain water efficiently. The benefit of installing a commercial flat roof is its simple design, making it easier to install and more cost-effective.
Despite their simplistic design, commercial flat roofs are solid and can withstand a lot of weight. They can also last for many years with proper maintenance.
Let’s now look at the different types of commercial flat roofs.
Types Of Commercial Flat Roofs
The construction of commercial flat roofs can vary, and knowing these differences will help you make a more informed decision when choosing a roofing contractor and also in the maintenance of the roofs. Here are the most common types of commercial flat roofs:
Built-up roofs (BUR)
Also known as tar and gravel roofs, BUR roofs are made up of multiple layers of tar and gravel. They are one of the most common types of commercial flat roofs and have a lifespan of 15 to 20 years. BUR roofs are popular because they are very durable and a low-maintenance roofing option. However, diagnosing a leakage issue can be difficult and their capacity to hold against adverse weather conditions is not as good as other types of roofs.
Modified Bitumen Roof (MBR)
An MBR is similar to a BUR roof, but instead of tar, it uses asphalt. This type of roofing is made up of five layers:
Insulation – This layer provides thermal resistance and energy efficiency.
The modified base layer – The base layer is firm, reinforced bitumen impregnated with fiberglass and responsible for the roof’s flat structure.
Modified bitumen membrane – This layer is composed of a co-polymer-impregnated sheet applied over the base layer.
Adhesive – This layer is an adhesive layer offering water resistance.
Surface – The surface layer protects the roof from the elements and UV.
An MBR has a lifespan of 20 to 30 years and is a popular choice for commercial flat roofs because it is easy to install and repair. It is also durable and withstands heavy foot traffic and adverse weather conditions.
Spray-On Flat Roof
The spray-on flat roof is a foam layered on the roof deck. A high-pressure system sprays the foam, which adheres to the roof and creates a seamless barrier. The process starts with a high-density polyurethane foam base layer, followed by a waterproof elastomeric topcoat. The topcoat protects against UV rays, weathering, and ponding water.
The spray-on flat roof is a popular choice because it is seamless, which makes it watertight and durable. It also provides excellent insulation and energy efficiency. The only downside is that it can be more expensive than other commercial flat roofs.
Metal Flat Roof
Metal has desirable qualities that make it an ideal roofing material for commercial flat roofs. It is durable, fire-resistant, and reflective, which helps to keep the building cooler. Metal roofs also have a long lifespan and are low maintenance. The most common type of metal roofing is aluminum, but steel, copper, and zinc options are also available. The main drawback of metal roofs is corrosion, especially in wetter climates. Installing metal flat roofs involves adhering metal sheets to the roof deck with fasteners and sealants.
Concrete Flat Roof
A concrete flat roof is made from concrete. It is composed of several layers:
A screed layer – The screed layer is a thin layer of concrete applied over the roof deck.
A vapor barrier – The vapor barrier follows the screed layer and prevents moisture from seeping into the concrete.
Insulation – This polyethylene film provides thermal resistance and energy efficiency.
A concrete layer – The concrete layer is the main structural element of the roof. It is self-compacting and provides a seamless, watertight barrier.
Concrete flat roofs are durable and have a long lifespan of up to 50 years. The main downside of concrete flat roofs is their weight, which can strain the roof deck and the building’s structure.
There are different commercial flat roofs, each with advantages and disadvantages. When choosing a roof type, the most crucial factor to consider is your area’s climate and weather conditions. Metal roofs are a good choice for areas with high winds and severe weather, while concrete flat roofs are suitable for areas with heavy snowfall. Spray-on flat roofs are a good choice for all climates, but they can be more expensive than other options. Ultimately, the best roof for your commercial building depends on your specific needs and preferences.
