Diy semi-hinged rafter roof

Diy semi-hinged rafter roof Semi-hip rafter roof

Experienced roofing and roofing frame designers and designers can attest that of all the available structures, the rafter system of a half-hip roof is considered the most perfect and at the same time difficult to manufacture. Its base was invented and created 300 years ago under conditions of an extremely humid and snowy climate on the coast of the Baltic Sea, which could leave a certain imprint on the frame structure of half-hip roofs.

Half-hip can be called a small roofing sector or a small slope, which is located between the inclined short rafters from the gable side. In modern types of structures of the half-hip variety, a couple of layout options are used. In the latter case, a vertical pediment section remains between the upper edge and the ridge of the half-hip, which is almost always equipped with a dormer or ventilation window for placing the attic.

The device of a semi-hipped roof

Advantages and disadvantages

Most people believe that the design and appearance of such a roof type handsome enough. The roof with a half-hip looks more modern and elegant, the weeks old gable rectangular and even hipped roofs.

Advantages of half-hip roofs. A little non-standard and strange, at first glance, a half-hip slope roof first appeared in Holland and Denmark, as the most optimal variant, which is able to withstand a climate with a lot of fog, rain and snow, constant frosts and regular roof / gable icing. For this reason, in the roof of the half-hip type, certain design features were first laid down that allow you to deal with moisture:

At first glance, this is not so important for modern conditions, but more recently, a shortened half-hip-type roof slope was a solution to problems under conditions of a very dense urban building. The house design with a shortened roof turned out to be very beautiful, and therefore a Danish roof with tiles or a half-hinged roof has long become an architectural classic.

Note that half-hips are very effective at reflecting wind pressure.

If you replace a half-gable gable roof with a flat pediment, then the latter will experience loads of several hundred kilograms, which can lead to extrusion of the wall cladding in strong winds.

Disadvantages of roofs with half-hips.Besides being beautifully designed and adapting to terrible weather conditions, this type of construction also has some drawbacks. First of all, high roof profiles. Initially, half-hip roof frames were quite tall.

In modern types of structures, the ridge height is determined by the customers. But even with a low installation height of the ridge beam, the installation of a half-hip roof is much more difficult than in the case of gable rafter frames according to the classical scheme.

In semi-hip roofs, the second main disadvantage will be an increase in the number of seams and joining lines of conjugated slopes. In this type of roof, there are much fewer of them than in hipped or classic hipped-roof schemes, but still the list of places of potential water leaks is larger than in a gable-type system. For this reason, additional canopies are often installed on the first half-hips of roofs, which reflect part of the water flow from rain and protect the walls and gables under them from getting wet.

For four-pitched roofs, the designers found another solution, and instead of the standard canopies, they extended two pitched side planes, as a result of which the upper edge and the window with an abutment bar were protected by them.

The rafter scheme of the system

In the most common version of the roof structure with halves of the hips, which are attached to the rafter frame, it strongly resembles a four-slope type scheme. For example, if you look at the drawings of half-hip type roofs with the lower placement of half-hips, it will become clear how the support system of the rafter beams is formed:

  1. Rafters are divided into 2 groups - hip and ordinary. The second ones are laid on the side roof slopes, the first ones are formed by hip halves.
  2. The central part of the rafter frame is made in the same way as in the case of a simple gable roof, and the ridge length is 2/3 of the distance between the walls on the sides.

  3. The height and shape of the slope of the future slope of the half-hip are formed by rafters.
  4. Half-hips are made of layered rafters, which at the base begin to abut against the Mauerlat, and the upper shelf on a transverse-type crossbar with an insert.

For schemes with top placement of half-hips, the rafter system is formed thanks to the hip beams that are installed between the horizontal beam of the crossbar and the ridge. In this case, the overhangs of the pediment are lengthened at a distance that is equal to the step of the rafters in the row.

Varieties

In modern construction design, you can find a lot of different modifications of a half-hipped roof, they are constantly used for different mansard schemes and residential attics, one-and-a-half and two-story buildings with balconies and outdoor recreation areas.

All of them are based on two common types - the Dutch and Danish scheme with a half-hip rafter frame.

Dutch

Such a roofing type in terms of the device fully coincides with the considered structure with the upper placement of a half-hip.A simple Dutch version of the construction of half-hip slopes is used for one-and-a-half-story houses, the rafter systems of which are made with long slopes, which are located at a large inclined angle.

The use of a half-hip makes it possible to reduce the wind load on the rafter system and at the same time protect the balcony / window from rain, and everything must be built on the gable of the building. The Dutch method of arranging a half-hip type roof makes it possible to reliably isolate the upper attic from the attic or living space under the roof.

One of the options for the semi-hip roof scheme is shown in the video. Such systems are ideal for attic arrangement with a sloping roof, country houses and country houses.

Danish

Diy semi-hinged rafter roof This is a classic truss system with a lower half hip placed. The Dutch models, despite the availability of manufacturing and the simplicity of the gable roof, have become less common than the Danish ones, since they are designed for large rafter frames. But in the last 15 years, with the active construction of two-story and three-story estates, the systems have become equally popular.

A drawing of such a half-hipped roof with frames can be applied to almost all types of buildings, from country houses with 3 floors to small one-story buildings. In the extremely cold and humid climate of Denmark, half-hip systems were built with broken slopes, as shown in the diagram. The upper part of the rafter frame should be at a steep angle, up to 70 degrees, the lower overhangs and ramps should be at an inclination of 20 degrees.

The result is a roof that strongly resembles a pointed medieval hat, which is equally comfortable in rain and snow. The owners lived in such bagasse, usually on the second floor, and on the first floor there was a kitchen and a stove, and supplies and utensils were stored in the attic and in the under-roof space.

For a long time, Danish roofs with broken slopes were the hallmarks of Copenhagen. Modern rafter systems only vaguely resemble roofing structures two centuries ago. This design makes it possible to equip a couple of windows in the attic without resorting to complex mortise and hearing systems.

Recommendations and advice

One of the bottlenecks of such roofs is associated with the arrangement of the zone where the upper edge of the roof covering adjoins the vertical pediment surface. It is in such a place that rainwater usually flows, and therefore, even when assembling the rafter system, an apron made of metal from galvanized, thin sheet steel is laid under the crate.

This will make it possible to increase the rigidity of the butt line and prevent tearing of the abutment strip to the walls.

Conclusion

The rafter system is relatively easy to assemble, reliable in use, widely used in private houses as a more successful alternative.If you have experience in the construction of frames of at least a gable frame, then it is quite possible to build the simplest Dutch or Danish roof with your own hands.

( 2 marks, average 3.5 from 5 )

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