The most common mistakes when building a roof
The roof, crowning the house, should be as reliable as all other constructions. However, errors in the construction of the roof are common enough. Therefore, the National Encyclopedia of Construction of ProfiDom.com.ua made a selection of the most common of them, so that it was possible to avoid such problems during the construction of a roof in a private home.
The first error
Lack of project or construction documentation. Even if you have found in the network a typical project of a private home, about the pros and cons of which the portal wrote in detail, it should be detailed in detail, described, all key details. And the features of the roof, including!
Otherwise, if you build a house simply by cutting out a magazine, without attracting an architect, the result may be dubious. You can not start building a house without understanding what the roof will be. It should be in harmony with the facade, layout, and other features of the structure. Therefore, a preliminary plan, a project with an exact calculation of the required quantity of materials and structural features is necessary.
The second error
Incorrectly selected roofing. For example, slate roofs and natural tiles require a sufficiently large slope, otherwise it will be difficult to provide tightness. For roofs of complicated construction, with a large number of angles, protrusions, joints, metal domes do not need to take – there will be too much waste, there will be problems with joints.
In this case, it is advisable to stay on a soft roof, materials on a bitumen basis. In addition, the weight of the roofing should be taken into account, for heavy cement-sand tiles, for example, a reinforced base is needed. In any case, the choice of roofing material should be dictated by the features of a particular project. And the color of the roof must be in harmony with the facade finishes.
Error the third
Slabs in thermal insulation. It is very important to ensure that the insulating boards are tightly adjacent to each other. Otherwise, bridges of cold will appear, and all work will be done in vain. Mats and plates are stacked by the vassor, it is necessary to leave at a centimeter of allowances in width, in order to ensure a tight fit to the rafters. Level the heater at the bottom of the rafters.
In the case of laying two or three layers of the heater, the joints of the upper and lower plates should not coincide. Another important point – do not forget to warm the wall located behind Maurlat. Yes, this is a hard-to-reach place, but it also needs to be warmed up, otherwise there will be a significant defect in the thermal protection of the entire home.
The fourth error
Lack of vapor barrier or its incorrect layout. The “cake” of roof insulation should be executed according to all rules, otherwise dampness may occur, which will lead to deformation of rafters. Use construction films and membranes, and place them so as to ensure tightness.
Yes, it is difficult to do in places adjacent to the walls, roof windows and ventilation ramps. But you need! Use a special mounting tape to seal the joints of the vapor barrier to the structures and joints. And do not allow the laying of a subfloor film inside out! It is always sold face-to-face inside the roll, on it a dotted line is highlighted on the roll.
Lack of ventilation or illiterate installation. This can lead to the appearance of condensation under the roof, dampness and related problems. It must be taken into account that the area of supply and exhaust ventilation should correspond to 1 / 250-1 / 500 of the insulation area
If it is a question of the ventilation gap of the eaves, then it must be at least 0.2% of the area of the roof slab. It is possible to achieve this as a way of installing roof fans, aerators, cornice and ridge products, as well as the creation of special ventzazorov between insulation and insulating film.
Nervous apple tree. This is an obligatory element of the entire roof construction. The method of construction and the type of slab should match the roofing. If the step is enlarged, there are irregularities, then the finish coating will be mounted inaccurately, the joints will be leaky, fastening the weak.
It is important to remember that, for example, for a metal tile, the pitch should be 50×50 millimeters, and for roller materials, bitumen tile needs a solid flooring of thin boards or moisture-resistant plywood. For the slate roof, the cross-section of the slab is 40×60 millimeters.