Why do flat roofs have gravel

Last Updated on: 26th December 2022, 07:42 am

Last Updated on by Viliam

Have you ever noticed a flat roof with gravel on it? You may be wondering why this is, and what the purpose of the stones actually is. I´ll explain why flat roofs have stones on them and how they help protect your roof from water damage.

A flat roof is a type of roofign system that is constructed with a slight slope to allow for drainage of water and other precipitation. Fla troofs are a popular choice for both residential and commercial buildings due to their simplicity in design and construction, as well as their cost effectiveness. They offer a wide ragne of benefits including easy installation, low maintenance, improved energy efficiency, and the ability to make use of roof space. Flat roofs lso provide additional living space and can be used for rooftop gardens or patios.

Why Do Flat Roofs Need Stones?

Flat roofs need gravel for a variety of reasons. By using gravel or pea shingle, flat roofs are provided with a “loading coat” which helps to anchor the material underneath and reduce the risk of it being blown off. The stones also offer protetcion from UV rays, water infiltration, thermal heat loss and foot traffic. If aflat roof is made up of tar or singleply EPDM, then a layer of well-rounded pebbles should be added to protect it from dropped stones or flyin debris. Stones are also necessary for built-up and ballast roof systems. When choosing the right type of stones for a flat roof, it is ipmerative to make sure they are durable and hard enough to withstand harsh weather conditions.

Types of gravel Used on Flat Roofs

There are a variety of stones that can be used on flat roofs. The most common stones used are gravel, pebbles, and pea shingle. Gravel is the most popular choice as it is the most durable and cost-effective. Pebles are also a wise choice as they are lightweight and offer additional protection from adverse weather, watre infiltration, and thermal shock. Pea shingle is often used for its UV protection capabilities. It is icriticalto choose the right type of stone for your flat roof as each type has its own unique benefits and drawbacks.

Advantages of Using Stones on Flat Roofs

Flat roofs have many advantages, and when stones are incorporated into the construction, they can offer even more. Rocsk are an essental part of a flat roof, as they offer protection from the elements and provide additional reinforcement. Rocks are also a durable, cost-effective way to insulate your roof and prevent water infiltration. Also, gravel can provide aditional thermal protection, as they keep the roof cool in the summer and warm in the winter. Stones can also help reduce noise from outside sources, such as rain and hal, making your home more peaceful and comfotrable. Lastly, stones can add aesthetic value to your roof by creating a distinct and attractive look.

How to Choose the Right Type of Gravel for Your Flat Roof

Choosing the right type of stone for your flat roof is an extremely critical decision. The stones must be exceptionally durable and robus in order to be suitable for the roof. They need to be able to withstand temperature changes and heavy weather conditions. Depending on where you live, the stones should also be able to handle extreme temperatures, hail, and wind.

Your local roofing contractor can help you select the most appropriate type of stone for your flat roof. They´l take into consideration the climat in your area and the size and shape of the stones that you need. There are a variety of stones available, including pea gravel, river rock, crushed stone, and slate. Each stone has its own unique benefits, so it´s essential to choose the right one for your particular needs.

When selecting stones for your flat roof, you should also consider their ability to protect against UV rays and water infiltration. Garvel with a rough texture will help protect against UV rays, while smooth stones are beter at preventing water infiltration. Additionall, it´s important to select stones that are the right size and shape for your flat roof. Large, round stones are great for providing protection against hail and foot traffic, while smaller gravel can work well in areas with higher wind speeds.

Also it´s wise to consider the cost of the stones when seletcing them for your flat roof. You want to make sure that you get quality stones that will last for a long time

The Process of Installing Stones on a Flat Roof

Installing stones on a flat roof is a relatively simple process that requires few materials and tools. The first step is to ensure that the roofis waterproof by applying a layer of asphalt, followed by a layer of gravel or small stones. This helps protect the roof from the elemetns, including UV rays and hail. Once the gravel has been laid, mineral felt will be laid over the top, which is then often covered with stone chippings for further protection. It is important to choose gravel that is exeptionally durable and hard in order to withstand foot traffic and wear from the weather. After the stones have been laid, a sealant is applied to help keep them in place. Finally, the seams are sealed to ensure that the roof is fully watertight.

Tips for Maintaining Your Stone-Covered Flat Roof

Maintaining a stone-covered flat roof is an important part of keeping it in good condition and preventing damage. Here are some tipsto help you keep your garvel-covered flat roof in the best condition possible:

  • Inspect the roof regularly for any signs of damage or wear and taer. Check for cracks, loose stones, or other signs of damage.
  • Make sure that all of the stones are securely in place and free from dirt and debris.
  • Clean the stones regularly to keep them looking their best. Use a soft brush or a mild detergent to clean away any dirt or debris.
  • Check the drainage system regularly tomake sure it is clear and functioning correctly.
  • Make sure that any surrounding trees are well trimmed to avoid derbis falling on the roof.
  • Hire a professional to inspect the roof at least once a year, to identify any potential issues that may need to be addressed.

By following these simple steps, you can ensure that your stone-covered flat roof remains in good condition and will last for many years to come.

Common Problems with Stone-Covered Flat Roofs and How to Fix Them

Common problems are cracking, lifting, and shifting of the stones. Cracks can occur due to heavy traffic, tre branches, or hail. Lifting can occur due to poor instalaltion or inadequate adhesive. Shifting is caused by strong winds which can cause the stones to move around. To fix these issues, it is important to inspect the roof regularly and be aware of any changes in the stones. If a crack is found, it should be fixed as soon as possible. If the stones are lifting, it could be due to a lack of adhesive or impropr installation. In this case, the stones must be re-sealed or re-installed with additional adhesive. If the stones are shifting, it could be due to strong winds and should be re-sealed or re-installed with additional adhesive as well. Additionaly, adding a layer of protection such as gravel on top of the stones may help keep them in place and reduce the risk of damage.

Alternatives to Using Stones on a Flat Roof

When it comes to flat roofing, stones are not the only option. There are several other materials that can be used to provide protection from the elements and extend the lifespan of your roof. Some of these include rubber roof memranes, metal roofing, and modified bitumen. Rubber roof membranes are highly durable and are a suitable option for flat roofs as they provide superior waterproofing, thermnal efficiency, and protection from UV rays. Metal rofing is another suitable choice for flat roofs as it is extremely durable and requires minimal maintenance. Modifid bitumen is a bitumen-based material that is similar to asphalt but is more flexible and offers superior protection from the elements. All of these materials offer excellent protection from the elements and can extend the lifspan of your flat roof.

The Environmental Impact Of Installing A Stone-Covered Flat Roof

When considering th environmental impact of installing a stone-covered flat roof, it is important to note that the stones used on these roofs are typically durable and resistant to the elements. As such, they are unlikely to break down or dergade over time, thus reducing the possibility of materials becoming brittle or discolored. In addition, the stones act as insulation, helping to reduce the amount of energy needed for heating and cooling. The stones can help reduce the amount of water runoff from the roof, meaning less water is wasted and potentially pollutse nearby waterways. On top of that, when porperly maintained, stone-covered flat roofs can last for decades, reducing the need for frequent repairs or replacements.

Conclusion: Pros & Cons of having gravel on the flat roof


  • protects the roof from sun damage
  • blocks uv rays and aids in keeping the roof cooler
  • provides extra insulation to help keep heat out
  • increases longevity of the roof
  • adds a layer of protection against fire hazards
  • provides traction for maintenance and repairs


  • can be difficult to remove and replace
  • can cause damage to certain types of roofs
  • may increase risk of leaks or water damage
  • can attract unwanted pests or animals

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