What Are Green Roofs Made Of?

Green roofs are not a choice of color but a choice of lifestyle! 

Green roofs are becoming increasingly popular, especially with people who love nature as well as with businesses that are paying more and more attention to the ecological system of our world. They provide many benefits such as improving air quality, encouraging settlement of wildlife, slowing water runoff, and preventing overflow of gutters.

Green roofs are not a new concept. They have been around since the beginning of time, with one of the oldest green roofs being the Hanging Gardens of Babylon.

But what is a green roof? A green roof is also known as a living roof, is a roof of a dwelling that is covered with vegetation planted over a waterproofing sheet.

What Are Green Roofs Made Of?

There are three types of green roofs: intensive green roof, semi-intensive green roof, and an extensive green roof. Different types of green roofs require different plants and therefore require different depths for supporting the growth of vegetation.

However, they are all basically built the same way. A green roof is made up of three layers: drainage, filter, and vegetation layer. 

Support Structure

The first and most important step in the construction of a green roof is to check that the building can support it and is structurally sound. The reason is that a considerable amount of weight is being added as opposed to the weight of a normal roof.

Waterproofing Is a Must

The next step is the addition of a layer of waterproofing. Ideally, this needs to be a strong and tough type of material such as a heavy-duty pond liner. This is to prevent dampness and roots from getting through to your roof base.

Water Storage and Drainage

Now, one is ready to add a water storage and drainage layer. This consists of a layer of small pebbles to provide drainage.

A moisture blanket is added over the drainage layer. What is a moisture blanket? It is a fleecy material that serves as a moisture retainer and is important for the growth of vegetation.

Your growing medium is the next step. This growing medium layer should be at least 15cm in depth.

Choosing Appropriate Plants

Now the pièce de résistance is adding a choice of vegetation. The top surface layer is what creates your green roof. 

You can choose between different mixtures of seeds, small cuttings, or even herbs such as thyme. Choose lightweight rather than heavier plants in order not to add too much weight to your roof.

Make the Choice Go Green

Making the choice to build a green roof can be a simple and pleasant experience.

It will require some professional guidance and expertise to make the right choice in the type of green roofs chosen. Professionals will also make sure the roof structure is properly surveyed and strong enough and, if necessary, install any reinforcement needed. Thereafter adding the final layers will be a fairly quick process.

If you need help with your choice of green roofs, please contact us. We are here to help and advise you on the construction of your green roof.