What was stone in the building industry in antiquity is mostly concrete in today's buildings. The original masonry of an attic corresponds to the continuation of the outer wall with the same material. Consistently, in terms of material-based concrete, it is the basis of the roof border. It can be put on or poured as a prefabricated part.
In modern construction, concrete is the "most natural" solution
A concrete parapet corresponds to the original construction of the masonry on a concrete house. The structure of the parapet consists of a concrete core that runs along the edge of the roof in an L-shape.
After the precast concrete parts have been put in place or this "little wall" has been poured, the parapet can be clad with sheet metal. Alternatively, only a cover on the top of the wall is possible. It can be made of sheet metal or stone and protects the concrete from the weather.
Simply raise the outer wall and facade
If there is insulation or an insulation composite system on the outer facade, it can easily be extended upwards. So the insulation is "worn " higher than necessary. As a result, any risk of a cold or heat bridge at the roof edge and corner can be safely ruled out.
The parapet roof border installed as a wall extension does not necessarily have to be the same thickness as the wall below. You can get narrower than this.
Wait for the concrete to harden
If you build an attic with poured concrete in a formwork, you have to wait for the concrete to set and dry through. Depending on the concrete, it is 28 days or more. So-called precast concrete (€ 15.69 at Amazon *) also needs a few weeks to achieve its full load capacity. With a poured parapet, a roof should only be made accessible when the concrete has definitely and safely achieved its stability.
Weigh up the effort, especially with regard to moving and transport
Precast concrete elements are anchored to the underlying masonry with holes in the attachment surfaces. A heavy-duty crane is required to transport the cuboids into place. When pouring the concrete, the effort is less, since a ready-mixed concrete supplier with a pump arm and giraffe can also easily reach higher-lying roofs. The average roof height of private single-family houses is around twelve meters.Tips & Tricks You have to think of a culvert for drainage. If you are working with reinforcement, subsequent drilling may be impossible.