The eaves overhang of the roof has not only decorative, but also several very useful protective functions.
The eaves overhang of the roof is the lower part of the slope that protrudes beyond the plane of the house wall. Building rules do not regulate the width (overhang from the wall) of the roof overhang. There are only recommendations for the maximum overhang, depending on the material of the roof covering. For example, a corrugated asbestos-cement sheet can hang from the roof by no more than 50 mm, from ceramic tiles – by 70 mm, and from roofing steel – by 100 mm.
Eaves overhang functions
- The eaves overhang saves energy
- Ventilation in the eaves eaves
- Horizontal binder
- Sewing parallel to the slope
The size of the eaves overhang is usually determined by the architectural traditions adopted in a particular area. These traditions depend on the materials used for construction, the climate and the population’s perceptions of beauty and attractiveness.
For example, in the highlands of the Carpathians on wooden houses, you can most often see steep roof slopes with wooden roofing and a very wide overhang.
English-style stone houses have tiled roofs with very little or no overhangs.
A wide cornice overhang covers the attic (vertical) walls under the roof slopes of the attic. As a result, the house appears lower and its proportions look more attractive.
The eaves overhang changes, lengthens the apparent height of the roof, and this changes the proportions of the house, its architectural expressiveness. The house as a whole, with the roof slopes protruding far from the walls, seems to be lower.
A wide eaves overhang protects walls and windows from slanting rain, removes water and snow away from the walls, thereby preventing the walls and basement of the house from getting wet.
A wide eaves overhang covers, protects the high window from rain and snow. And in the summer heat, it shades the window, limiting the amount of sunlight that heats the room. The overhang lining is made in the same color scheme with the details of the window and terrace.
Wide cornice overhangs create a cozy space near the walls of a one-story house. A wide overhang, as it were, increases the area of the house.
Under a wide overhang (at least 70 cm), you can put a bench, store garden tools, arrange a woodpile of firewood. Sometimes the eaves overhang of the roof acts as a canopy on the door.
A house with a large eaves overhang looks better on spacious areas surrounded by greenery.
The narrow overhang of the roof lies on the eaves (ledge) of the wall. The wall cornice is partially wrapped around the pediment wall. This architectural technique makes the house visually lighter and slender. The house seems taller and more compact.
A narrow overhang lying on the eaves of the wall is more suitable for a house in dense urban areas.
The eaves overhang saves energy
If you choose the right size of the eaves overhang, you can save energy spent on heating the house in winter and on air conditioning in summer. To do this, it is necessary to choose the width of the overhang and its height above the window so that in summer the eaves of the roof obscures the window, and in winter the sun’s rays penetrate the window and heat the room.
If the windows are not protected from the sun by a cornice overhang in summer, for example. on the lower floors, then on the southern facade of the house it is necessary to install shading devices outside above the windows. These can be awnings – awnings or roller shutters. Their installation should be foreseen at the stage of designing house windows.
Ventilation in the eaves eaves
In the eaves overhang, elements for ventilation of the under-roof space or an unused attic must be provided, through which air enters from the outside and then moves to the ridge of the roof. For example, arrange a special gap or install perforated panels or ventilation grilles in the filing.
It is recommended to leave ventilation openings with a total area equal to 1/400 – 1/600 of the roof area in the eaves eaves for air flow. At the top of the roof for air outlet, make
The ventilation openings through which birds or insects can enter must be covered with a net.
Luminaires are built into the wide eaves overhang, which illuminate the facade of the house and illuminate the adjacent territory.
To make the house look beautiful, the cornice overhang is closed from below – hemmed with various materials. Overhang filing is sometimes called the foreign term “soffit” or “soffit”. Overhang filing can be done in several ways.
Eaves overhang of the roof of a private house – horizontal filing. The filing panels are attached to the bottom chord of the trusses perpendicular to the wall plane.
If a rafter system is used as a structural roof frame, then the horizontal filing is performed as follows.
The horizontal roof sheathing panels are inserted into the grooves of the starter planks perpendicular to the plane of the outer wall.
The bars on which the filing panels are installed must not be fastened to the outer wall. Otherwise, the movement of the wooden parts of the rafter system with changes in load, humidity or temperature will cause deformation of the sheathing panels.
In the construction market, plastic panels for installing soffits can be found from siding sellers. Several manufacturers of PVC gutter systems also produce soffit panels.
Siding for soffit has a large selection of colors and textures. The material is lightweight, durable and relatively cheap, making it very popular.
The panel profile can contain one, two or three strips 10 – 12 cm wide. Each. Material thickness 1 – 2 mm. The strips can be perforated.
Sections are cut from the panels, several millimeters in length shorter than the distance between J – profiles. The panel should be positioned freely in opposite profiles in order to compensate for temperature changes in the panel length.
Plastic J – profiles are attached to wooden planks every 30 – 50 cm.
Filing of the eaves overhang of a private house with panels, PVC clapboard
In addition to siding, PVC panels are used for the soffit, which have a voluminous honeycomb structure. The thickness of the panels is 8 – 10 mm., The width is 10 – 30 cm. Narrow panels are often called plastic clapboard.
Due to the honeycomb structure, PVC panels are stiffer than siding, and their weight is not much higher. To connect the panels to each other, a groove and a ridge are formed along their edges.
The soffit panels are attached to the lathing of wooden bars. Self-tapping screws are screwed into the edge of the panel groove. The distance between the screws is about 30 cm.
The soffit made of siding or PVC panels is very easy to maintain. As necessary, the coating is washed with water and an antistatic agent.
Roofing profiled sheet is sometimes used for filing the cornice – corrugated board. It is recommended to use sheets with a wave height of no more than 20 mm.
The traditional tree for the soffit is used less and less. Wooden parts require regular maintenance to look good. Approximately every five years, the tree must be treated with protective compounds, painted or varnished.
Horizontal filing is more suitable for a house with a hip or hip roof.
Sewing parallel to the slope
The eaves overhang of a gable roof of a private house is most often hemmed parallel to the roof slope.
For the soffit device parallel to the slope, the same materials are used as for horizontal hemming.
The eaves overhang is not always hemmed. The photo shows an interesting idea of the architect, when the roof rafters are left open.
The eaves overhang is closed with a filing in order to give the house an attractive look. Protruding rafters and the lower surface of the roof usually do not look aesthetically pleasing. But this is not always done. The photo above shows a variant of the device for a wide eaves without filing. published by econet.ru
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