Flat roofs are popular for commercial buildings and some residences. While they are not as common as pitched roofs, they offer some advantages, such as being easier to install and repair. However, like all roofs, flat roofs have a limited lifespan and will eventually need to be replaced. Here are five signs that it's time for a flat roof replacement.

1. Your Roof Has Reached the End of Its Useful Life

Every roof has an effective lifespan. If your roof is approaching or has already surpassed this age, it's time to start thinking about replacing it. Of course, the actual lifespan of your roof will depend on the materials used, the climate you live in, and how well the roof has been maintained over the years. But as a general rule of thumb, you can expect your flat roof to last around two decades before needing to be replaced.

2. You See Water Stains on Your Ceiling

If you notice any brown or yellowish stains, that's a surefire sign that your roof is leaking and needs to be replaced. Don't ignore these stains. The longer you wait to replace your roof, the more damage the leaks will cause.

3. Your Energy Bills Have Risen Dramatically

If you've noticed a sudden spike in your energy bills, there's a good chance it's because your roof is no longer doing its job of keeping the heat in during the winter and cool air in during the summer. This means your HVAC system must work overtime to maintain comfortable temperatures inside your home, driving up your energy costs. Flat roof replacement can help you save money on your energy bills in the long run.

4. Your Roof is Sagging or Buckling

Sagging or buckling happens when the supports underneath the roof become weak or start to break down. Not only does this make your home look unsightly, but it's also incredibly dangerous. A collapsing roof could seriously injure someone or even kill them. If you notice any sagging or buckling, contact a roofer ASAP to inspect the roof.

5. Your Roof Has Ponding Water

Ponding water is when rainwater or melting snow doesn't drain properly and pools on your roof. This can happen for various reasons, such as clogged gutters or a low spot on the roof. Ponding water is dangerous because it puts extra strain on your roof, which could lead to leaks or even collapse. 

Whether you're dealing with one or more of these issues, it's time to start considering a flat roof replacement.

Contact a company like Allcon Roofing to learn more about roof replacements.