San Antonio Roofing: Article About The Dangers Of Standing Water
Following a heavy storm or several days of rain, homeowners may discover that they have standing water on their roof. Standing water is any water that is still on a roof after 48 hours. It may be tempting to not worry about what appears to be a small amount of water on a roof, but it doesn't take much to do a significant amount of damage that will require San Antonio roofing repair services.
Standing water is a problem for two main reasons. Water is very heavy and can find its way into the roof's infrastructure, causing damage. Additionally, most roofs have pinhole imperfections in them. A one inch deep pool of water that is spread over one square foot weighs five pounds. By extension, a five foot by five foot area of roof with one inch of water on it can add 250 pounds of weight to a rooftop.
Depending on how large of an area the water covers, thousands of pounds of additional weight may need to be supported by a roof. When too much water collects on a roof, it could exceed the roof's load bearing capacity, causing the roof to collapse.
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Along with the potential problem of collapse, the weight of water also contributes to the collection of other types of moisture and debris. As water collects, a roof can start to sag due to the weight. When the roof sags, it creates a depression for more water, among other types of waste.
The other issue with standing water is that a roof is designed so that water flows off of it. This is accomplished in a variety of ways, including through the use of shingles that repel water and slanting a roof so that water naturally runs off it into gutters.
However, when water doesn't run off a roof like it is supposed to, it has a chance to start working its way into the small holes in the roof's structure. These holes aren't normally an issue since water isn't supposed to stay in place for more than a few seconds, but, when it does, leaks can begin to form.
Since these pinholes are usually all over a roof, multiple leaks can develop depending on where and how much water is pooling. Leaks can allow water damage to occur in a roof's structure and soak insulation, reducing its efficacy. Along with weighing down a roof and causing leaks, standing water on a roof may also become a breeding ground for mosquitoes.