A gazebo with a flat roof is constructed quickly

To erect a pavilion quickly and inexpensively, four corner posts, on which a flat roof is laid, are the simplest type. In most cases, a frame that joins the corner posts together and the laying of roof coverings such as boards or corrugated iron.

Stability and support structure

Although the design and construction of a pavilion with a flat roof is simple and does not pose any problem for any DIY enthusiast, some static details should be considered, above all, from a certain size and roof area.

On a flat roof, of course, dirt remains like leaves or branches and snow in winter. This creates a mechanical load that must be taken into account when calculating the roof cover elements.

Corrugated or trapezoidal roofing tiles have an increased stability due to their shape, which also allows cantilevered up to two meters free suspension. For larger distances to be bridged, consideration should be given to a supporting substructure, such as a spider or center post.

Slope for water drainage

To ensure the drainage of a flat roof, a slight inclination of the roof is recommended. Professionals recommend two to three inches on each meter.

It should be noted that in a roof without gutter the water in heavy rain sometimes runs torrents on one side of the pavilion. In particular, on the water drainage side, the foundations of the support posts must be protected against under-flushing to avoid loosening the corner posts.

Provider and costs

  • karibu.de is one of the largest German manufacturers of garden sheds and offers kits for various flat roof pavilions.
  • gartenhaus-gmbh.de offers high quality pavilions with flat roof and side elements in modular technology.

The individual purchase of the components is possible in any hardware store and the need for construction materials such as posts, retaining beams and roof covering manageable.

Simple prefabricated kits for pavilions with flat roofs start from 500 euros, closed variants with side walls from around 1500 euros. Anyone who assembles the building materials himself and, for example, in the hardware store, can calculate from 300 euros for the pavilion.

Tips & Tricks

Even if the construction of a pavilion with flat roof is self-explanatory, the neuralgic stability points such as the post foundations, the attachment of the roof substructure and the roof elements themselves should necessarily be carried out expertly.

Video Board: Garden Room Workshop: Part 9. Flat roof structure