A parapet or a roof edge profile on the garage roof

A parapet on the garage roof is usually more of a roof edge profile or a cornice. In common parlance, the borders are often generally referred to as parapets. The elevations through profiles can only measure a few centimeters and do not have a real crown. They are edged and can be mounted flat.

Sheet metal frame as a profile or masonry as an attic

The transition from the roof edge profile to the real parapet is fluid. The roof edge profile is a slightly raised frame that surrounds and covers the garage wall and roof at a right angle. An attic is a structure that has its own crown and forms a wall extension.

There are structural specifications for both types of construction. While a parapet can remain unclad as a roof border at the transition between the roof edge and wall, a profile must cover at least five centimeters of the wall end.

Structural requirements and specifications

In both constructions, drip edges must protrude at least two centimeters, which is realized by a sheet metal on the crown of the parapet or by a protruding profile arch.

Molded parts that have already been manufactured must be installed at corners and ends, which applies to both the roof edge profile and the covering of a parapet. The parapet on the flat roof of the garage must be designed in such a way that it triggers a controlled and controlled water drainage. The slope of the circumferential profiles must point inwards towards the roof, where the incoming water can flow away through a drainage system such as a gargoyle.

Fastenings and joints

With a parapet on the garage, the distances between the fastening points are defined depending on the material. At heights of up to ten meters, the following distances must not be exceeded:

  • One meter on concrete roofs
  • Ninety centimeters on aerated concrete roofs
  • Wood on sheet metal sixty centimeters
  • Wood on wood 33 centimeters

The following maximum joint widths at the joints are recommended for covers and profiles made of aluminum:

  • 1.79 millimeters per running meter
  • For cover or profile pieces with a length of 2.50 meters, three millimeters
  • Seven millimeters for cover or profile pieces with a length of five meters

If the outside temperature is colder during installation, the joint widths must be adjusted (one millimeter more for every five degrees Celsius less)

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