Flat roof cultivation - favorable space gain


Whether the family has grown or you just want to have a little more space, a flat roof cultivation is, if it is well executed, a cheap and ideal variant. What you should pay attention to, we show here.

Plan flat roof cultivation

The two most important factors when planning a flat roof extension are the insulation and the slope of the roof. So that the additional space does not become a major burden on the cost of heating bill, you should observe and comply with the new standards of the Energy Saving Ordinance.

Insulation in flat roof cultivation

The most important insulation of flat roof construction is the upper roof insulation, but you should not forget the insulation of the floor slab or the outer walls.

For the outer walls, it makes sense to use a superior insulation system, since so enough housing remains and the cold is already caught where it arises.

Slope and roofing for flat roof cultivation

Which slope is necessary for the flat roof depends primarily on the roofing chosen. For a roof covering made of bituminous membranes or tar paper, a roof pitch of three percent is sufficient in the least case.

  • lowest slope with bituminous membranes from about three percent
  • Roofing with trapezoidal sheet can also be done from about three percent
  • Tiles or roof tiles require at least 15 percent tilt depending on the model

Tips & Tricks

However, if there are deciduous trees around your new flat roof cultivation, then it is advisable to choose a slightly greater gradient than three percent, as the drains quickly clog with leaves and small branches.

It can also accumulate compost from the leaves everywhere on the roof, because the self-cleaning power of the roof at this low slope does not work yet. In this case you would have to clean the roof yourself at least twice a year.


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