Duplex roof - installation of the roof
Our idea of a country house is impossible without the image of a cozy and beautiful roof. And of course, this should not be a flat “city”, but a dual-slope roof. Even a small child we learn to draw a house like this. But the device and the construction of the house - not a child's drawing. This is a complex construction process, which includes the creative work of the architect, engineering calculations requiring high qualification, and the direct implementation of the project by experienced specialists.
The roof of the roof: the difference between pitched and flat
Since the roof of the roof is located under a certain slope, its angle must also be calculated. When calculating take into account the average annual rainfall and wind load. In thatgable rooffundamentally different from the flat, for which the wind load has a minimum value. For the pitched, this is largely a determining factor that requires accurate calculation due to its windage.
But the load from snow or rain for the pitched one is less important, since due to the slope, in most cases they are spontaneously removed, while the flat roof needs special engineering solutions and regular maintenance. From the same considerations, a suitable material is selected when roofing the roof, for which the optimal angle of inclination of the ramps is specifically indicated by the manufacturer.
Why is a gable roof?
First of all, the species are divided by the number of skates. The most common and familiar -gable roof. Nevertheless, there are also three- and four-pitched ones, and there are even odnoskatnye. Regardless of the complexity of the project, the device itself will consist of a carrier part and roofing flooring.
Shed - rarely used for a house type. As a rule, it is used as a shelter or in the construction of garages, sheds. The slope will be small, although there are almost vertical options.
Chetyrekhskatnaya (poluvalmovaya) - the design of the four slopes, usually two pairs of the same. Most often it is country or rural objects. Subspecies chetyrehskatnoy - hip. In this case, all four identical skates converge at one point.This type is used for capital construction of houses with a square base.
The hairpin-shaped is a rarely used species, where several skates are collected in the form of a triangle.
And this is only a very generalized classification. There are projects of houses, the number of roofs of which even difficult to count.
However, the most popular is the proven variant of the dual slope roof. And this is explained not only by high reliability and relative simplicity of construction, but also by a certain aesthetics, which it communicates to the house, giving it a neat and finished look.
Rafter Roof System
At the design stage, several basic parameters need to be taken into account.
Gable roofwith a tilt angle of more than 50 degrees, there is practically no fear of snow drifts, there will not be a large snow cap on it. And with less load, this will reduce the cross section of rafter legs. For a more sloping design with a slope angle, for example, 2-4 degrees, the calculation of the truss system will have to be made taking into account the load several times larger.Accordingly, this will affect the cross-section of the rafter legs, which ultimately leads to an increase in the consumption of materials and higher prices for the whole structure.
The rafter leg is a structural element, the lower end abutting against the wall, and the upper one connecting at an angle with the opposite rafter leg.
Wooden rafters of a double-sloped roof and more complex structures undergo a special treatment, which makes it possible in large measure to prevent the spread of fire in the event of a fire. In addition, the increase in cross-section of the truss leg allows it to withstand the effects of fire longer.
Thermal insulation characteristics
The use of modern insulation materials, such as mineral wool, allows us to achieve excellent results with a slight increase in the load on the roof system.
Materials and service life
Each material has its own performance characteristics and scope. They are selected on the basis of the architectural features of the building and the purpose of the object.
The service life of the metal and reinforced concrete systems is about 30-50 years.Wooden (with appropriate and timely care) - 20-30 years.
As a rule, this type of coating is used when installing the roof of houses, where there are only two load-bearing walls. These are low one- or two-story houses - in particular, built on Canadian technology. Such lightweight prefabricated frame structures have only two load-bearing walls and do not imply the arrangement of massivegable roof. The main components of such a truss system are the mauerlat (a bar mounted on the top along the perimeter of the outer wall on which the rafters are supported), racks, rafter legs, lathing and screed.
The advantages of wooden construction include relatively low costs, the use of environmentally friendly materials and a sufficiently long service life with the mandatory special processing of structural elements. Of the negative factors - low fire resistance, susceptibility to rotting and exposure to harmful microorganisms.
The main distinguishing feature of such a dual-pitch roof is damping properties. That is, the ability, depending on weather conditions, to work both in tension and in compression.
The upper part of the structural frames, arches or trusses are usually mounted from wood, and the lower part - from metal reinforcement.
Installation of the roof of this type is quite expensive, and for this reason in private construction is rarely used. It is used mainly in the construction of industrial facilities. The advantages include the possibility of overlapping long spans (up to 20 meters) and excellent decorative characteristics. Disadvantages - high initial cost, as well as costly repairs.
The main elements of the truss system of reinforced concrete are manufactured at the factory and delivered to the construction site in a ready-made form. When mounting the roof, they are joined by welded embedded parts. This type is used in the construction of large economic structures: hangars, warehouses, elevators. Its advantages are the longest service life, increased durability and ease of maintenance. Among the shortcomings, we note a huge load on the foundation and the need for special equipment for installation.
Installation of the roof
Regardless of the type, type or material, the basic design of a dual-pitch roof consists of the following elements:
- the horse;
- inclined edge;
- eaves overhangs.
But the complexity of its construction, the cost of roofing and maintenance depend on the specific conditions. This is the internal structure of the house, and the accepted angle of inclination of the slopes, and even that which is in close proximity to the house.
However, however difficult and often costly the task is not to buildgable roofa country house, do not give it up. In addition to its functional advantages, it has an undoubted aesthetics and appeal. This is the first thing that we see when we return home, in contrast to the dull urban "landscape", where the roof is not visible at all. This is a huge field for creativity and the opportunity to design a unique image of your own home, which, organically fitting into the surrounding natural environment, will delight you and your loved ones for more than a dozen years.
See what happens to the roof after 5 years of operation.