The pitched roof and the rafter spacing - information

Virtually every roof has rafters, also the saddle roof, also called gable roof. The distance between the rafters depends on the special calculation for the roof, but also varies according to the local practices.

Normal rectors of saddle roofs

As shown in the description above, the sparing distance is not the same for all houses. For new buildings, it is between 65 cm and 80 cm, with old buildings he can be much larger, up to 120 cm, but also smaller, for example 50 cm.

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Influences on the rafter distance

A roof must be designed so that it is stable, so does not break together under heavier loads. The weight on the roof is made up of the roofing materials (battens, insulation, tiles), plus there is, for example, snow (pitched roofs are more common in snowy areas than flat roofs and are also steeper there so that the snow can slide off better does not form too much load). The greater the expected load, the smaller the rafter spacing is usually.

However, the strength of the rafters also has an impact on the distance. Thick rafters can be spaced further apart than thinner rafters.

In new buildings, in which large skylights are often installed, the rafter spacing is also determined depending on the window size. This saves work, while in an old building for a new roof window either rafters have to be cut out or rafter replacement installed, depending on whether the rafter spacing is too large or too small.

Calculation of the rafter spacing

The calculation of the rafter spacing is always done by a specialist in a new building, unless you are building a carport or patio roof (but these are usually pent roofs, not gable roofs). Because only a structural engineer has the knowledge to reconcile the individual factors - load, material thickness and quality, window size - with one another. These calculations are necessary if you want to build a house. Without it, you will not get a permit.