Green Roofs: How to Detail Waterproofing Using Liquid Membranes, House M / Plan:b arquitectos House M / Plan:b arquitectos
Green roofs are composed of a series of layers that allow vegetation to grow correctly, avoiding leaks that may cause damage to the structure of the building. Although there is a wide variety of options to build them, we're presenting a system composed of a mortar base, a layer of asphalt emulsion, two waterproof asphalt membranes, a drainage layer, and the substrate that will allow the growth of plant species.
To waterproof the areas of parapets and other 'critical' points, the system includes a liquid polyurethane membrane, which allows the entire system to be sealed. Below, you can see some application keys of the different components of a green roof, and the benefits of this liquid impermeable layer.
Cortesía de SikaHotchkiss Biomass Power Plant / Centerbrook Architects and Planners. Image © David Sundberg/EstoCortesía de SikaCortesía de Sika
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Save this picture! House M / Plan:b arquitectos. Image © Sergio Gómez House M / Plan:b arquitectos. Image © Sergio Gómez
1. Slab
Cover under the system with a minimum slope of 2%
The first layer of a green roof is made up of the roof of the building, which will receive its loads. To ensure proper drainage and avoid water stagnation, these should be able to move fluidly on the slab, maintaining a minimum slope of 2%.
