Pitched roof slope – An important aspect that should not be underestimated


The pitched roof is one of the more special roof forms that are not yet too widespread in this country. The construction got its name from the console, which, like the roof named after it, has a surface that is inclined on one side. Pitched roofs are particularly common in Europe for buildings or parts of buildings that are attached to another object, such as extensions, side aisles of basilicas or bay windows. Increasingly, however, they are also used as main roofs in house construction. best fountain pump there are several reasons for the increasing demand for pitched roofs .On the one hand, it is because a pitched roof costs less than a gable roof. On the other hand, the special roof shape has other advantages, such as the relatively simple construction and the good suitability for generating solar energy. In this guide, we will explain what to consider in terms of roof pitch when deciding on a pitched roof.

What are the advantages of the pitched roof?

The pitched roof looks like a very sloping flat roof or a halved gable roof. As a result, it offers a modern and straightforward look. Building a pitched roof on a house is even easier than building a flat roof. Basically, it is difficult to understand why the majority of builders do not opt for a pitched roof, because it offers numerous advantages:

Simple design – faster assembly and lower costs

More space to live – there is only one sloping roof on the upper floor

More inclined than the flat roof – precipitation runs well

Normal windows can be integrated into the upper floor – creating bright, light-flooded rooms

Can be easily aligned to the south – Perfect for generating energy through photovoltaics

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In particular, the last point is a decisive argument for the pitched roof for many builders, because in view of the rising prices for energy costs, more and more people want their own photovoltaic system on the roof. The pitched roof does not have many disadvantages, only good insulation of the roof must be taken into account.

With the pitched roof, it is extremely important that it is aligned in the right direction. It is recommended to face north so that the house is protected from the weather and can be opened on the south side with large window fronts. However, if you want to generate solar energy, you have to align the roof to the south.

Possible roof pitches in the pitched roof

The high flexibility of the pitched roof is also reflected in the large scope that you enjoy when designing the roof slope. In principle, roof pitches of between 11 and 60 percent are possible. However, most pitched roofs are designed to be quite flat with inclinations of 20 percent. How many degrees the roof pitch of the pitched roof should be depends on various technical and optical factors. Among other things, the degree of inclination determines for which type of roof covering the pitched roof is suitable at all. In addition, the slope depends on how well the roof surface cleans itself. If roofs are too flat, there is a risk of lichens and mosses attaching to the roof, which reduces durability.

The roof slope determines the type of covering

You should already consider how much your pitched roof should be inclined during planning, because this will determine which type of roofing is suitable. Many commercially available roof tiles are only suitable for inclinations of 20 percent or more. With a lower roof slope, the precipitation could run back and penetrate into the roof cladding. In the case of a very low inclination, it is therefore advisable to install a second, waterproof sub-roof under the brick covering. However, this increases the costs and the risk of faulty execution.

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Meanwhile, many manufacturers have special tiles for slightly inclined pitched roofs on offer, which are developed as flat roof tiles. They are suitable for roof pitches from 7 to 20 degrees.

Steeper pitched roofs with inclinations between 45 and 60 degrees are suitable for almost all roof tiles made of concrete or clay. The individual manufacturers provide a data sheet for each roof tile. This shows how high the minimum inclination for the respective brick must be. The following variants are suitable for particularly flat pitched roofs:

7-degree Dachstein from Braas – suitable for 7 to 12 degrees roof pitch

Rapido folding tiles from Creaton AG – suitable from 16 degrees roof pitch

Terra Optima from Creaton AG – suitable from 18 degrees roof pitch

Ergoldsbacher E58 SL from Erlus AG – suitable from 20 degrees roof pitch

Depending on the type, roof tiles made of concrete, plastic and clay are therefore only suitable for a specific inclination, which is why they must be bought appropriately. The situation is different with trapezoidal sheet metal: Here you have to pay attention to a certain overlap of the individual sheets so that the roof becomes completely tight. calculate pond pump size with a gradient of three to five degrees, the overlap should be at least 20 centimeters, while for a gradient of five to 20 degrees, it should be at least 15 centimeters. From a 20-degree gradient, it is sufficient to let the individual trapezoidal sheets overlap ten centimeters.

Avoid too weak roof pitch in the pitched roof

Although there are now suitable roof tiles for flat pitched roofs, you should refrain from a too low inclination for self-interest.

Only from a certain roof slope does the self-cleaning effect of the roof begin, which is why flat roofs must be cleaned twice a year, because the water flows too slowly, so that mosses and lichen can settle.

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Whether the self-cleaning works or not, but also depends on the wave pattern of the trapezoidal sheet or the roof tiles, which is why no generally valid recommendations can be made here. In tightly worked waves or valleys, even a slight amount of water is enough to eliminate bird droppings, leaves and moss. However, if the water is distributed over a wide channel, if it slopes too slightly, it does not have enough force to carry the dirt away with it.

Calculate the roof pitch on the pitched roof – How to proceed

The calculation of the roof slope is carried out using the tangent. First of all, you need to think about how much higher the roof at the steep end should be compared to the low end. In addition, you need to know the length of the roof. The following formula is used to determine the slope of the roof:

Roof slope = height (in centimeters) divided by the length of the roof (in centimeters)

The height in the formula does not refer to the total height, but to the difference between the height at the steep end and the height at the low end. To illustrate, we will show you below how to calculate the roof slope using the example of a carport for the garden:

Pitched roof length: 600 centimeters

Height of the front: 300 centimeters

Height of the back wall: 250 centimeters

Height difference: 50 centimeters

50 centimeters divided by 600 centimeters is equal to 0.08

The 0.08 is multiplied by 100 to determine the roof slope in percent

Thus, you come to a roof slope of 8 percent.


In principle, it is advisable not to choose the roof slope too low for pitched roofs. With a flat pitched roof, special flat roof tiles must be used for covering and the self-cleaning effect also decreases. Pitched roofs with an inclination of at least 25 degrees are better suited.

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