Roof drains are elements placed in the roof structure, whose role is to drain rainwater from the surface. What types of roof drains are there and how to install them properly?
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What types of roof drains are there?
In practice, roof drains are available in various variants, so you can choose a solution that suits the style of the facility. Appropriate variants must be adapted to the specificity and needs of a given building. The basic criteria are single and double gullies. The former are also called one-piece or single-flange, while the latter - double, are also called two-piece or two-flange.
The second way of classification is to take into account the variant based on the arrangement of pipes. Here we should mention horizontal models (angular, with a side exit) and vertical models, i.e. the so-called easy. Each variant helps to effectively drain water, but they differ in their mechanism of action. Vertical drains are connected to stormwater drainage pipes, so water is drained directly from the drain into the stormwater pipes. In the case of horizontal drains, the installation is slightly more extensive, and rainwater is initially discharged into the sink basket and then via downpipes directly into the sewage system. When horizontal drains are used, the water is directed to internal drain pipes.
Additionally, there are special variants, such as a heated roof drain . This solution is worth attention because it prevents a serious problem with icing blocking the drain and patency of the entire installation. An alternative solution is a parapet roof drain , characterized by a specific structure and shape. Thanks to this, the water drainage method is effective.
Roof drains with a bituminous collar are durable, solid and durable models. The big advantage is that a specially prepared collar allows for maximum tightness. An additional advantage of the collar is that it is easy to install.
Correct installation of the roof drain
The effectiveness of drainage depends on whether the drain is installed correctly. A very important element is the proper selection of elements for the type of roof. You should be aware that moisture and water can damage flat roofs.
Manufacturers of individual models provide detailed assembly instructions with the product. It is assumed that roof drains should be placed at the lowest point of a flat roof, because such a location will ensure optimal water drainage. In addition, they must be located in easily accessible places to ensure easy flow and access to individual elements for maintenance purposes.
When installing the drain, make sure that individual accessories are mounted precisely. Each leak has very serious consequences. First, prepare a hole of appropriate diameter and then place the body in it. Everything must be properly arranged and then attached to the roof surface. In the case of roofs with a waterproofing layer material made in a multi-layer model, the drain must always be attached to the first layer. Then, if the selected model has one, a special bitumen waterproof membrane is installed.
Additionally, you should pay attention to whether the roof on which the drains will be installed is designed to be walkable. This determines the depth at which subsequent elements will be placed.
How to select the number of roof drains to the roof surface?
The number of inlets used in the roof drainage system depends largely on the system selected. Where it is less than 40 m2 or if the total area is large and the riser height is small, there are no conditions to use a vacuum system. In such a situation, a gravity installation is performed. The number of drains made will depend on the square footage. It is assumed that one drain should cover approximately 300-350 m2.
Roof drains in the Onninen wholesaler
At the Onninen wholesaler, we have a wide range of roof drains, adapted to various needs. One of the models is a roof drain with a connection flange for Geberit 12l/s (Pluvia) 359.111.00.1 collector gutters from the Geberit Pluvia series. These models are available in various sizes and diameters, and the most important advantages include a functional connector made of PEHD, which can be shortened to adapt to your needs. The material from which the element is made is characterized by exceptional durability and solid construction.
Another solution used on flat roofs is the Ecoguss roof drain DN100, heated 48310.03 . This is a heated solution that needs to be attached to a plastic pipe. Sealing flanges are used to ensure maximum tightness.