The Pros and Cons of Flat Roofing for Commercial Buildings

There are several types of roofs—pitched roofs, gambrel roofs, dome roofs, flat roofs, etc. Of these many types, flat roofs have most recently become the most resounding. And for good reason too. They’re sleek, modern-looking, and easy to install. 

If you’re thinking about putting a flat roof on your commercial building but aren’t sure if it’s the best choice, this guide will help you by pointing out the good and not-so-good things to consider before you decide.

But first, what exactly is a flat roof?

What is a flat roof?

A flat roof is precisely what it sounds like—it’s nearly level, with a slight pitch to allow for water drainage. Unlike the more traditional sloped roofs, flat roofs have a minimal incline, making them appear, well, flat.

Flat roofs can be made from various materials, but they typically involve a horizontal surface covered with materials like asphalt, modified bitumen, rubber membrane, or even a concrete slab. The choice of material depends on factors such as climate, budget, and the intended use of the roof.

Underneath the visible surface, a flat roof has a supporting structure, usually made of beams, joists, and sometimes a decking material like plywood. This framework provides the foundation for the roof covering and supports any additional weight, such as people or equipment on the roof.

Flat roofs are not entirely flat; they have a subtle slope designed for water drainage. The slope is crucial to prevent water from pooling on the roof, which could lead to leaks or structural issues over time.

READ ALSO: Roofing Materials in Ghana: Which Ones Are Best for Your Home or Construction Business?

So, why is there all the rage about these flat roofs? Well, they’re modern, minimalist, and rather versatile architectural styles. Which makes the case for them as commercial roofing options. Let’s see what they really have to offer in detail:

Pros

1. Fits the Look:

Flat roofs have a modern and practical look that blends well with the new spring of buildings we have in Ghana. They’re clean and simple, which matches the styles you see in our neighbourhoods like East Legon and estates like Devtraco.

Is the look of your commercial building, especially the roofing so important? Absolutely! 

The aesthetic appeal of a commercial building attracts more people and businesses. Flat roofs give you that look. This positive appearance can bring in more customers and improve the building’s overall value.

2. Space-Savers:

Commercial spaces often come at a premium, and the ability to maximize usable space is a significant advantage. Flat roofs allow for rooftop gardens, solar panels, or additional functional spaces. This way, you save space and still make the most of the available square footage. Ultimately, it can translate into increased revenue opportunities, such as hosting events, installing additional equipment, or creating recreational spaces for employees.

3. Easy to Put Up and Keep Up:

Flat roofs are a straightforward choice. They’re quick to install, which means less hassle during construction, and they’re also easy to take care of. Simple maintenance keeps them going for a long time. So you get the looks and still save money.

4. Wallet-Friendly:

Money matters and flat roofs tend to be lighter on the wallet. They don’t need as much material, making them a smart choice for commercial projects where budgets are tight. Plus, they can save you money in the long run with lower maintenance costs.

Cons

1. Rainwater Hiccups:

If you’re in Ghana, you know the rains can get heavy when they want to be. But more than anything, you need your roof to be able to handle the downpour. 

But that’s one hiccup of the flat roof. Unlike pitched roofs that have a noticeable slope to encourage water runoff, flat roofs have a much more subtle incline. If the design or construction of the flat roof is not done correctly, there’s a risk of water puddling. Puddling occurs when water accumulates in certain areas on the roof instead of draining away properly.

If water is allowed to pool on the roof due to a design error, it can lead to several problems. Prolonged water accumulation can compromise the structural integrity of the roof. It may result in leaks, damage to roofing materials, and even affect the underlying structure of the building.

Thankfully, you can solve this problem by simply simply hiring an experienced roofer; someone who knows how to design a good drainage system that fits our weather and the flat roofing system. 

2. Tough on Wear and Tear:

Our weather can be harsh, and flat roofs take the full hit. For example, unlike pitched roofs that allow water and debris to slide off, flat roofs have a more subtle slope. This makes them susceptible to the full force of the weather.

Regular upkeep is a must to keep them standing strong. Plus, checking and addressing issues regularly helps prevent small problems from turning into more significant, potentially costly issues. It’s a proactive approach to keep the roof in good condition over time.

Invest in good-quality materials and have an expert install them to avoid headaches down the line. Quality materials contribute to the durability and longevity of the roof. Choosing subpar materials may lead to premature deterioration and frequent repairs.

3. Insulation challenges:

Slanted roofs, with their slope, make it easy for ventilation and insulation to work well. They naturally create the right conditions without needing a lot of strategic planning.

On the other hand, flat roofs, without a natural slope, need intentional and well-thought-out steps to insulate effectively. Without careful planning, there’s a risk that the building may struggle to keep a consistent and comfortable temperature.

Successfully insulating a flat roof depends on a smart combination of the right materials and proper installation methods. This combination is essential for making sure the building stays thermally efficient, avoiding problems like temperature swings and unnecessary energy use.

Conclusion

Deciding on a roof for your commercial building is like choosing between different cars. Some have better gas mileage, some are roomier, and some are more stylish. Similarly, roofs have different features – some are good for drainage, some provide extra space, and others might be easier on your budget.

Before settling on a flat roof, compare it with other options. Think about what matters to you – how it looks, how much space you need, and what fits your budget. This will help you make a better decision.

But don’t do it alone; get advice from professionals like contractors or engineers. Their insights can help anticipate potential challenges, assess long-term costs, and guide the decision-making process toward a solution that best aligns with the unique needs of the commercial building.

At Rosa Roof, we take great pride in guiding our clients through the process of choosing the perfect roof for their buildings. We understand that selecting the right roofing solution is a significant decision, and our mission is to make this journey as seamless and informed as possible. We go beyond this to get the job done for you—and without hassle.

Want to know if a flat roof is the right choice for you? Shoot us a message so we can talk about the best roof fit for your building.