Due to the erection of a mansard roof, may significantly increase the usable space of low-rise private houses. However, this is a very laborious process which requires the preliminary calculation, the observance of certain rules and techniques. Properly designed truss system mansard roof is the key to creating comfortable, reliable, functional and durable houses.
1 Truss mansard roof system: design features
1.1 Schematic mansard roof
2 Elements of design mansard roof
3 Types of mansard roofs
3.1 Lean-to Dormer roof. Photos of successful projects
3.2 the Gable mansard roof: construction
4 Truss system attic roof. Drawings classic version
4.1 calculation of the mansard roof
5 Windows for mansard roof
6 Methods of installation of mansard roof
6.1 How to build a mansard roof in the traditional way?
7 Technology insulation of mansard roof
7.1 Important rules for insulation of mansard roof
7.2 How to insulate a mansard roof: progress
7.3 Varieties of insulation for the attic roof. What insulation is better?
8 creating a mansard roof with his hands, step by step. Video instructions
Truss system roof roof: design features
Before the construction of the attic needed a good project. Appearance of your future roof should be in harmony with the General appearance of the building. There are several varieties of the design of the truss frame, depending on the type of roof, the pitch of rafters and attic roof. Opt for a specific configuration, you should be aware of any structural elements comprises a frame system. It is the supporting skeleton of the roof, and can withstand not only the weight but also the influence of precipitation.
Truss mansard roof system has its own configuration features that are important to consider in planning and construction
Proper installation of roof system provides the reliability, functionality and durability.
When creating the project mansard roofs should:
to perform the correct calculation of the load on the support load-bearing walls and the Foundation, preventing its excess;
to choose quality thermal insulation to avoid uneven heating;
to choose a good sound insulation due to properly chosen roofing material;
to choose a good waterproofing;
choose a lightweight lining materials for finishing the attic space.
Scheme mansard roof
The truss system can have a sloping or hanging design. Structures in the hanging rafters are based on mauerlat and ridge run. To distribute the load on the rafters are installed the upper and lower torques. When the slope length of more than 4 m, to prevent sagging in the lower part of the structure of the truss legs propped up with struts and braces. The main advantage of this design is that all its elements are placed in unused areas of the attic, which creates more space.
The sloping design is used in homes where in the middle of the building is a load bearing wall, which supports the construction of the legs. On the inner support structure is laid groundsel, which plays the role of mauerlat, and he mounted rack that holds the ridge run. This system is used for large areas of the mansard roof of a private house, which you can see in the photo. Here you can use roofing materials with a large weight, such as slate or ceramic tile.
There are projects mansard roofs of private houses, where it is used both roof systems. To release free space frame elements can be offset to one side, where they will be used as the basis for the walls, and Rigel suitable for lining the ceiling. Some architectural styles beams and posts can be used as decorative elements.
For the arrangement of large eaves, mansard roof is done with a focus beyond the supporting walls. Here does not install mauerlat. The system is mounted with the use of beams. Be sure to set the strut, a special rack cut into the beams and rafters are fixed using a reliable anchor connection, and wire twisting.
Diagram of truss system attic roof
Elements of design mansard roof
Truss system under the mansard roof consists of the following structural elements:
the rafters or beams of the uprights;
additional beams, regala and runs.
The basis of the whole structure of the roof is mauerlat, which consists of wooden beams of square section, fixed to the external walls of the building. These boards are mounted the other elements of the frame of the mansard roof. The primary purpose of mauerlat is the perception and the uniform distribution of the entire load from the General system of roof-bearing walls of the building.
Rafter leg or rack of beams form a frame of the roof structure. For these items, you must pick boards that can withstand the load of the roofing together with an outer coating. To maintain stands of beams or rafters purlins are used, mounted at an angle. Vertical posts hold the Central part of the truss boards, protecting them from bending. They also provide support for the ridge beam.
To ensure the rigidity of the future roof structure on the long roof truss systems are installed ridge beam. The crate is an additional wooden structure that is attached to the truss system and is the basis for a future roof.
Types of mansard roofs
Today there are several options of mansard roofs, which have a different design of the truss frame:
polylines consist of two or more rays with different angles of inclination;
a gambrel has two triangular ramp with the short sides of the roof and two trapezoidal slope with long;
poluvalmovaya have two short front hip over the front part of the roof;
the dome is characterized by round or polygonal shape;
vaulted have a sectional arc shape.
Shed roof is the most simple in execution. He is frequently approached when it is necessary to make the attic into a small country house. The most popular among other types of mansard roofs of private houses photos clearly confirm this, is the gable roof. Its design and construction is straightforward. Especially if we are talking about a gable roof.
When choosing a sloping roof, it is possible to obtain a large, functional and comfortable attic room with no additional work associated with the construction of the walls. Today, many prudent owners of private houses prefer truss system gable roof under the corrugated sheet, a construction which does not require numerous technological and technical tricks and unnecessarily high consumption of resources for construction materials.
The most difficult to install are hipped, arched and domed mansard roofs. Their device requires a professional approach. Data mansard roof, photos of private homes clearly show, have unusual and highly aesthetic design. They are characterized by a large number of pitched breaks that are device ends. Diagram of the truss system demonstrate the peculiarity and uniqueness of this design. The unsatisfactory state of each of the valleys (internal angles) can be a potential danger to the integrity of the entire roof.
Hipped mansard roof of a complex configuration requires a specific miscalculations of the load on the Foundation and walls of the building
Lean-to Dormer roof. Photos of successful projects
The most simple, reliable and cheap option is a lean-to roof mansard. The result is an unconventionally designed building. This type of roof is used for industrial and commercial buildings. Also, often used for single storey small houses. Here you can use all roofing materials.
Design involves the creation of a high mansard roof Windows. In this construction, missing strong point, which simplifies its installation. Mauerlat fixed on the walls with different levels, due to which is formed the bevel. It is based of the beam.
The angle of the slope must be in the range of 35-45 deg. The less the slope, the more snow will accumulate on the surface of the roof that will require additional supports and strengthen the girders. Besides, it will greatly reduce the roof space. Design able to withstand strong winds with proper orientation of the roof slope, which is necessary to improve the stability of the structure.
A useful tip! If between opposing bearing walls at a distance of not more than 4.5 m, it is possible to mount the supporting elements, and just put on the wall of long wooden beams. This further reduces the cost of construction of the roof.
This type of roofing involves the use of simple elements to create a ventilation of roof spaces. Enough to sew two perforated soffit overhang, or mount the ventilation grille.