Four Ways Standing Water Can Be Damaging To A Flat Roof

Posted on: 7 December 2017


If you have a flat residential or commercial roof, it is important that you find a roofing contractor who has experience with flat roofs when you need a new one installed. Flat roofs are very different than sloped roofs because water can sit on the roof and not drain if the roofing system is not properly installed. While this may not sound like a huge deal, sitting water can cause damage to your flat roof a number of different ways. Here are four ways that standing water can be damaging to your flat residential or commercial roof:

Increases the Risk for Roof Leaks

Standing water on a flat roof increases the risk of leaks developing in the roof. When water is sitting on your roof, it has time to penetrate your roofing materials and the membrane beneath it. Overtime, this can lead to leaks developing, which can cause damage to the wood structure supporting the roof, the wood and insulation in your home or building or provide moisture for mold to grow. 

Causes the Roof to Sag

Another problem that sitting water on a flat roof can cause is a sagging roof. When it rains, the water has nowhere to go, so it just sits there. If it continues to rain, the amount of water sitting on your flat roof increases. Your roof can only support so much before it begins to saw or bow. Not only does this aesthetically look bad, but it can lead to many other roofing problems, such as ice dams or collapsed roofs. 

Allows Moss and Algae to Grow

As water sits on your flat roof, it provides moss and algae the moisture they need to thrive and grow. Unfortunately, these are plants that you do not want growing on your roof. They can strip your roof of moisture, causing the membrane and wood to crack or split. When you keep water off of your roof, you minimize the chances of algae and moss growing. 

Shortens the Lifespan of Your Roof

The last problem associated with sitting water on a flat roof is that it shortens the lifespan of your roof. Roofing materials, including those used on flat roofs, are not designed to have water sitting on them. When water sits on them for prolonged periods of time, it can weaken the material, damage it or decrease its efficiency. All of these things can lead to your roof needing to be repaired more frequently or replaced more often. 

If you have a flat roof and are in need of a new roof, always be sure to ask the roofer what experience they have with flat roofs. You need an experienced roofer who knows how to properly design the roofing system for your flat roof so that water drains, instead of sitting on the roof and causing damage. 

Contact a company like Earhart Roofing Company Inc for more information and assistance.