What is a cornice of the roof

One of a house’s most distinctive architectural features when viewed from the street is its roof. Roofs serve more purposes than just protecting us from the weather; they also frequently display elaborate details that give a building personality and flair. The roof cornice is one such element that is essential to both style and utility.

The visible edge of a roof that protrudes beyond a building’s walls is called the cornice. It accomplishes several goals by fusing form and function in architectural design. Its main function is to keep rainwater away from the walls, shielding the structure from moisture damage and foundation erosion.

In terms of architecture, the cornice is essential in determining how visually appealing a building’s exterior is. It gives the roofline more depth and dimension and produces a unique silhouette that enhances the building’s overall character. The style of cornices can differ greatly, representing various architectural eras and traditions, ranging from plain and understated to elaborate and ornate.

In addition to its decorative and protective roles, the cornice has historically had functional uses. Cornices helped direct rainwater away from the facade of older buildings, especially those with masonry walls, lowering the chance of dampness and decay. Even though its function in managing water is still vital, cornices are still common in modern architecture and provide both architects and homeowners with a means of expressing their creativity.

Cornice device: General information

The cornices on roofs of wooden houses are arranged very simply; four facades’ perimeters need to be nailed or cut to fit specific profile bracket shapes. The courtyard shouldn’t be accessible from the northern facade at the same time. Boards are then fastened to the brackets, which have to be cleaned with an antiseptic or resin beforehand. Generally speaking, the first nailed board should be roughly 3-5 centimeters wider than the others. To replace the dropper, follow these steps (also see "Installing the dropper on the roof").

A decorative through thread can be used to adorn the boards. Lining the ends of the beam tessom is the simplest method of equipping the cornice. The rafters’ extension is completed if they do not extend past the walls. Nail board pieces to each beam to accomplish this.

Remember that a specific outline is needed in order to create cornice architectural profiles on brick walls. She shouldn’t be thicker than fifty millimeters.

Keeping this moment in mind, think about the surfaces that can be treated with the solution:

  • Designs from boards;
  • Ready -made masonry outlets;
  • Metal frame that is covered with a net.

In order to complete the plastering cornice profiles, double-leaf profile board patterns are utilized. The profile must be stretched on the ground and then removed, which requires the second shackle. The spotless profile is then given a complimentary first-handing.

Rather, rollers will be needed for the cornice overhang device and its finishing. While paying close attention to every detail, they assist in moving a heavy template. It is best to use specific templates for cornice profiling if they are situated in incoming corners.

Practical tip: position the profile board of the template at a 45-degree angle to the wall in order to reach the top of the corner.

Rectangular triangle: this will serve as the template’s salad substitute. Usually, a profile board is fastened along his bisector. The metal profile base is positioned in between the boards. The chamfers in this instance ought to be on the outside. Decorative plaster is advised if you wish to decorate different cornice profiles. As its aggregate consists of crushed glass, mica, quartz, and granite crumbs. P. Also see: "We are a professionalist’s home."

Plaster is typically applied in three layers:

  • The first layer – spray. It grows the base with a plaster outline. To obtain this layer, you will need a solution with a liquid consistency. Depending on the material, the thickness is also selected – from 5 to 9 millimeters.
  • The second layer is soil. Its manufacture is carried out from a solution of a pre -preset for spraying in advance. The latter should, as they say, "grasp". Layer thickness – from 5 to 12 millimeters.
  • The third layer is the front. Its application is carried out by ongoing, and the thickness should be less than the declared 2 millimeters.

You can begin the stucco application after the plaster application is finished. They consist of specific cornice rods that have been installed.

Cornice overhang of roofs and its types

  • Frontal – designed to protect the facade of the building. Performed using protruding walls of the walls of slopes. They are usually installed under an inclination;
  • Lateral – made in the form of overhangs, which are located on the sides of the building.

Keep in mind that the width varies depending on where the cornice is. The majority of the time, side overhangs are released 50–60 centimeters outside the structure’s walls. Frontal overhangs: one meter maximum, although this distance may be extended.

You must release the skate board to the previously confirmed length beyond the facade in order to set up a front-line standard roof. Next, in accordance with the same theory, the load-bearing roofing crossbars that are fastened to the rafters are released.

The cornice board should then be fastened to the bearing bars and the end sides of the roof skate. It’s possible that the lower portion of the cornice frontal overhang is not packed with sofit. However, installing sofitis is still advised to enhance the house’s appealing appearance.

Important: Careful material selection is necessary to guarantee the frontal cornice overhang’s dependability. Remember that the cross section should have the same horizontal beam and rafter design.

Roofing beams should be released outside the wall’s outer plane when creating a side cornice overhang. The blind area’s width and the building’s height will determine the release distance. Following the stage of fastening the ends of the beams, lay the material to cover the roof. In this instance, the plank binding serves as the roof’s cornice. It will conceal the roofing floor’s original substrate and edge.

Usually, a special material is used to hem the remaining open overhang space. Usually, a groove is used for this at the cornice board’s bottom. Using a downted board or vinyl siding is advised (for further information, see "Roofing with siding – instructions"). Every material needs to be fastened at a ninety-degree angle.

The device of the cornice overhang of the roof and its ventilation

The installation of ventilation is required and is the primary regulation. regardless of the size and style of the overhang you have selected. In the event that you intend to equip the attic, ventilation is crucial. The entire area of the room should be between 1/600 and 1/400 of the total number of ventilation holes. Gaps should be present in the overflowering cornice bearing. They are essential to the interior’s fresh air circulation system. In order to allow air to evaporate from the room, special holes are provided by the bearing of roof overhangs. It is situated in the roof’s skate.

Important: a net should be used to seal off ventilation holes. She keeps bats and other tiny birds out of the room by keeping them out.

Cornice overhang device and material selection

Boards of any length or width are used for carved cornation overhangs. Its thickness should be no more than 22 millimeters, but it should be at least 17.

The board can be mounted at the ends if it is small. The mount should be placed on every meter of massive boards (longer than six meters).

  1. The best material for creating an overhang of a four -sloping hip roof is wood from conifers (pine, spruce, larch). Boards should be made of dry material. After his academic, the linear deformation of the boards should not remain. It is she who leads to damage to the appearance of the binder, since there are many gaps.
  2. In addition to boards, sheets made of galvanized steel can be used for lining of overhangs. The optimal thickness should be 0.6–0.8 millimeters. In turn, perforated leaf material should have a wavelength of more than 20 millimeters.


  • Another material for hearing overhangs is leaf aluminum, covered with a protective layer of pollination. Its width is calculated from the ratio of the parameters of the cornice overhang. Optimal thickness – 0.6 millimeters.
  • Since the sheets are fastened to the skin with latches, their length shouldn’t be more than six meters. Additionally, the sheets will sag if they are longer than necessary.

    A lot of snow accumulates on the roofing overhang during the winter. This may cause the overhang to collapse, followed by the cornice or even the walls.

    Poor cornice manufacture can cause the masonry and external wall surfaces to be destroyed in a hip roof with a minimum roof overhang. The upper and lower logs of the crowbar crowns will deteriorate in a wooden house. After being wet and drying, logs may break severely, losing their hemp and seams. The lining of a log home painted with oil paint will deteriorate if you don’t perform high-quality waterproofing (see "Roof overhangs – classification and installation").

    Considering all of these subtleties, equipping the cornice is highly recommended. In turn, he carries out the following duties:

    • Eliminates the line connecting the upper part of the carrier wall and the internal structure of the roof slope (read also: “Sofita: Sizes”);
    • Makes the facade of the house – finished. And also provides improved protection of the walls of the building.

    The cornices’ photo and video materials are available for viewing. After figuring out the material’s cost beforehand, you can also select the best option for your country home there. Also see: "Paint selection for a galvanized roof."

    Independent approach to the device of cornice overhang

    The process of building the roof is laborious and involves multiple steps that need to be carefully attended to. Following the completion of the major construction, the devices and cornice bindings—two smaller-scale but no less significant structural components—come into view. We will first examine the definition of the roof cornice, its components, and whether it is actually required.

    In terms of architecture, the cornice refers to the portion of the structure that extends beyond the building’s walls and shields them from the effects of rain, snow, and moisture seeping into a subcutaneous space. Apart from its protective purpose, the cornice closes off the internal components of the rafter system and lends the roof a unique aesthetic appeal.

    Cornices: classification and main types

    Building houses has been the main activity in history for many centuries, and every generation attempts to add something new and more contemporary to make the process of building a home better and easier. The following types of overhangs are the most commonly used among the vast array of variations available:

    • filed, used in the arrangement of gable and hip roofs;
    • Unexpected overhangs are the most common option used for holm and pitched roof of the house;
    • Boxing cornices – are used in the construction of a broken and single -sloping roof;
    • shortened overhangs – a universal option for any type of structure.

    Since the roof cornice is essentially an extension of the roof, the type of overhang needed must be carefully chosen, taking into account the characteristics of the local climate as well as the makeup of the roofing "pie."

    The roof cornice device comes in a wide variety of forms and falls into the following primary categories:

    1. Cornice overflow. In this case, the rafters are not excreted beyond the boundaries of the walls, and a horizontal drain board is attached along their edge, to which drainage gutters are subsequently mounted. Lack of these overhangs in the absence of protection of the upper elements of the wall from moisture.
    2. Open Office – is widely used in private construction. The drainage system is attached to the upper edges of the rafters or along their lower edge.
    3. Closed overhang. The protruding ends of the rafters are closed with a cornice with a special groove for attaching sofitis from the inside. In the presence of an insulated attic, such a cornice should have ventilation holes.
    4. Pediment overhang. The device of the cornice of the roofing in this case completely depends on the fantasy of the designer and can, how to play beyond the boundaries of the walls, and arrange a flush. The protruding area of ​​the roof is subject to mandatory binder, the width of which should be at least 50 cm.

    Depending on the style of building and local meteorological conditions, cornice overhangs vary in length. Therefore, it is taken from 55 cm for wooden houses and up to 55 cm for panel and brick homes. The range of values is 40 cm at the minimum and 120 cm at the maximum.

    Characterization of cornice overhangs

    Independent work can be performed on the roof’s cornice construction, which is not the most challenging task. The most important thing is to comprehend and handle the two primary options for cornice overhang construction, which are as follows:

    • Frontal, which is the protruding inclined edges of the roof slopes, which serve as the protection of the pediment of the building from atmospheric precipitation. Their length can reach one meter;
    • side – these are overhangs up to 60 cm long, located on the sides of the building.

    The cornice overhang’s value is affected. The cornice should be longer in proportion to the height of the structure.

    If the rafter system does not have projections over the house’s walls, the rafter legs are further extended by cutting the wrapper, and then the cornice is fastened to them. It is imperative to bear in mind that the purpose of the roof’s cornices is to safeguard the pediment of the house. For this reason, it is crucial to accurately determine the required overhang width. The lower edges of the overhangs are sheathed with boards or other material to provide the roof of the aesthetic species with support and to keep moisture out.

    We make a cornice over our own hands

    Properly installed roof cornice: this is a task that can be carried out with the right construction tools, technical know-how, and adherence to safety regulations. Recall that the sequence of work depends on the finishing material selection and how it is fastened, and that the sheathing of the pitched roof’s cornice overhang is dependent on the usage of rafters.

    The ridge timber is released to the appropriate length to form front cornices. The lower protruding board and skate are fastened with a stretched cord that is used to cut the protruding ends of the boards. Additionally, the wind cornice board is nailed to the transverse boards and the end of the ridge beam that protrudes. The entire roof’s flooring is installed concurrently with the installation of roofing material along the resulting overhang’s length. Similarly, the edges of the rafters extending past the building’s walls in a parallel manner.

    Installing a trimming board or metal profile cornice on the roof is the next step. The material for the cornice itself is also chosen based on what is intended to be filled in the overhang. Thus, a wooden lining is installed on a wood frame, and siding is installed on vinyl or metal profiles.

    Prior to creating the roof’s cornice, you should choose the kind of cornice box, which can be:

    • vertical – in this case, the skin is carried out according to the rafters protruding for the line of the wall. This method is used only in the case of a small slope of the roof;
    • horizontal – the box with one edge is attached to the board located at the junction of the wall of the house and rafter legs, to the other to the lower point of the rafters.

    The bearing of the cornice overhang is constructed of materials like wood, siding, lining, and sofit and is positioned at a right angle to the building’s wall.

    Selection of binding material: what to pay attention to?

    A well-manicured cornice not only looks good, but it consistently keeps the underworld area safe from wind, moisture, and cold penetration. For this reason, careful consideration should be given to the material selection for the binder. Thus, the most well-liked ones now are:

    • Coniferous wood: larch, pine, spruce. The thickness of the boards should be within 17-22 mm. In order to avoid possible deformation, the boards should have optimal humidity, which is why they are stored on the street before starting work. Before the binder, the wood is antiseptic processing to prevent fire and decay. Short boards, laid perpendicular to the wall, are attached along the edges, while the long ones are fixed to the box parallel to the wall with a step per meter. Between the binding boards, a 1-2 cm gap should be made to create ventilation.
    • Siding – a more strong variety of plastic lining. Vinyl siding is a budget option that does not have sufficient practicality in operation. Metal siding is more durable and costs much more, however, due to the tendency to corrosion, its service life is relatively short.
    • PVC lining – affordable material that has more disadvantages than advantages. Under the influence of rain, snow and sun, it quickly dulls and loses its elegant look; The absence of ventilation holes has a negative impact on ventilation.
    • Sofites – a fashionable version of the baking of the cornice of the roof, in the design of which perforated ventilation holes are already laid. Unlike siding, Sofita is environmentally friendly and have increased resistance to mechanical influences. The advantages of this material are durability, aesthetic appearance and ease of installation, so that its installation can be easily done with your own hands.

    Wood-filled cadanial overhangs require special protective compositions to be applied every three to five years. This will enable you to keep the original type of binder and its operational qualities for an extended period of time.

    Even in the adverse effects of heavy snow cover, the correct and dependable device of the roof’s cornice will help to prevent deformation of the structure. Recently, there has been a lot of popularity for anti-icing roof gutters and cornices, which basically involves running heating cables through gutters and ahead of the cornice. These wintertime adjustments prevent ice buildup on the overhang, which would have placed a heavy burden on the roof.

    Properly installed ventilation will aid in extending the "life" of the roofing structure. The gratings, openings, and fissures between the bearing material and the bearing walls are the primary ventilation components.

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    The device of the node of the cornice of the pitched roof

    Every roof in the house has a cornice device attached to it. A cornice is even present on a flat roof, which is installed with roller materials. Its apparatus is required to prevent rainwater from getting into the sub-worship area. perhaps the roofs with parapets attached are an exception.

    The purpose of installing the cornice is to prevent moisture from penetrating the subcutaneous area.

    Apart from its functional duties, the cornice serves as the last piece of decoration on the roof structure because the internal rafter system components close after the end of the binder. In order to optimize the protection of the house’s roof rafters, they are taken out of the wall to a 50-centimeter segment outside the wall. This indicator might not rise significantly in some circumstances.

    Properties of roofing overhangs

    The inside mechanism of the roof’s cornice. When making the box, you should use large quantities of knot-free, non-twisted boards free of bark.

    There are instances where the rafter system’s design lacks protrusions that extend past the house’s walls. Simultaneously, a technique is employed which suggests that the rafters are forced to extend because of unique components known as mares.

    Not to mention, the building’s pediment is protected by the cornice device, which is something we should not overlook. There should be at least 500 mm between the overhangs that shield the house’s pediment. In this instance, a cornice-style board is fixed to the roof’s edge. Skin is required for the lower portion of the cornice construction. The most common sheathing for cornice nodes is a board.

    It’s crucial to keep in mind that the frontal and pitched cornices have remarkably different designs.

    The ornamental or practical edge of a roof that protrudes past a building’s walls is called the cornice. It enhances the building’s architectural style while providing functional and esthetic benefits by shielding the walls from water runoff. In order to maximize a roof’s appearance and longevity, homeowners, architects, and builders must comprehend the design and purpose of the roof cornice."

    Types of cornice overhangs

    Diagram of the caudal overhang device: 1 rafters, 2 overhanging cornice boards, 3 (4): Sofits reference board 5. Sofit; 6. crate (7.8). Ten: a dropper; eleven: an apron cornice bar; and nine: a drainage gutter.

    Throughout the history of building houses, a vast array of overhanging designs have been created and effectively implemented. Among the primary kinds are:

    1. Unsuitable overhangs – are used in the arrangement of a hip roof of the house both for a napal and gable structure.
    2. Heaty overhangs – are also most often used on hip roofs and are widely in demand when the roof of a gable structure is arranged.
    3. Boxing cornice overhangs – used in the arrangement of a single -sloping and broken roof.
    4. Shortened cornice nodes of the roof are used on absolutely every type of structure.

    Such cornices will also look good on the Danish roof.

    Varieties of cornice overhangs

    The selection of the roof’s cornice node is contingent upon the climate of the area in which the building project is being carried out.

    There are various kinds of cornice overhang nodes. It is crucial to delve deeper into the specifics of their design as a result.

    Cadet overhang installation plan when a frontal board is present.

    In situations where the rafter system is not excreted past the front wall boundary, a flush cornice overhang is used. This calls for using a drain board, which is positioned horizontally, to reinforce the rafters’ edge. This is done to prevent moisture from penetrating the house’s pediment. In this instance, the drainage system is likewise guaranteed. Such design elements also lend uniqueness to a broken roof.

    This node has one disadvantage in spite of its benefits, and that is the upper portion of the wall is not secure against water. The overwrestling overhang knot is at least 50 centimeters long. A shorter ledge can be created if it is set up in brick or panels.

    Cadet overhang installation plan devoid of winding board.

    It is advised to install cornices in the attic to help prevent drafts from forming there and to stop snow from bluffing into the space left by the wall of snow during the pediment construction process, should the house wall be allowed to release puffs beyond its line.

    An extension takes the place of the broken roof’s rafter legs’ missing protrusions behind the wall line. They fasten to rafter ends with screws or nails. Following that, the trimming is attached to a cornice board.

    When the primary rafters of the gable roof form outside the building, open-type cornial overhang nodes are created. In this instance, the drainage system is conjugated to either the upper edges or the lateral portion of the rafters. This node’s design features enable you to use it to construct a broken roof in a private residence.

    During the closure of the rafters projecting for the pediment, overhang, closed cornice nodes are formed. The skin’s components are inserted into a unique groove that is used from the inside for this purpose.

    The pediment’s node can be positioned to speak through the walls in addition to being flush. The owner of the home and the designer’s ideas are the only factors that determine the method to be used; either way, it will be accurate. Whichever method is selected, there will always be that portion of the pitched roof that is exposed.

    List of materials and tools for overhanging overhang

    The choice of materials

    Since coniferous wood is thought to be the best material, coniferous wood boards are typically used to sheathe the nodes of the cornices on gable roofs. You must consider the material’s humidity content when selecting it. Overly damp material has the potential to distort over time, ruining the overhang’s appearance.

    The cornice overhang installation plan with a width exceeding 45 cm.

    It is important to note that the wooden casing should have a minimum thickness of 17 mm and a maximum thickness of 22 mm. Additionally, the board’s length and width are chosen separately. Every side of the sheathing undergoes conjugation. Boards longer than six meters are exempt from this. In this instance, the conjugation is carried out in steps that are one meter long, representing the length of the skin-making material.

    A waterproof composition should be applied to the boards that sheathe the gable roof’s nodes at the cornices. This is completed prior to beginning work. This is accomplished by using a specific paint or varnish made for wood processing. Every two to three years, wooden casing needs to be treated. She will only be able to live a long time in this situation. Apart from boards, alternative construction materials can be employed for the skin:

    Overhanging cornice.

    1. Galvanized steel sheets. When sheathing roofing cornices, steel is used, the thickness of which should not exceed 0.8 mm. In addition to ordinary steel, metal sheets that have perforation can be used. To cut such material, use special equipment. After the sheets are ready, they are covered with paint to avoid corrosion.
    2. Aluminum sheets. Their thickness should not exceed 6 mm, and width – 30 cm. Special latches are used to conjure sheets.

    You will need a standard set of tools used in the roof device to line the overhangs:

    • construction level or plumb line;
    • hammer;
    • roulette;
    • screwdriver;
    • fasteners;
    • pencil;
    • Construction corner ruler.

    A roof’s cornice is more than just an ornamental edge; it is an essential part of the structure’s defense. The cornice, which is positioned at the edge where the roof meets the walls, extends outward and frequently has eaves and gutters. Its main purpose is to divert rainfall away from the building’s foundation and walls, thereby averting long-term erosion and water damage.

    In terms of architecture, a building’s cornice gives it personality and flair. Depending on the architectural style and the designer’s preferences, it can be either simple or complex. Beyond aesthetics, a structure’s overall appearance, including its historical authenticity and visual appeal, can be influenced by the size and shape of its cornice.

    Practically speaking, the cornice protects against the weather as well. It helps to maintain a comfortable interior temperature by reducing heat gain and offering shade and protection from direct sunlight by hanging over the walls. In warmer climates, this shading effect can lessen the need for excessive cooling, which can improve energy efficiency.

    In summary, a roof’s cornice combines form and function. It creates a visual statement and protects the building from weather extremes and water damage by fusing essential protective features with beautiful architecture. Comprehending its function in roofing architecture facilitates the appreciation of its importance from an aesthetic and functional standpoint by both homeowners and architects.

    Video on the topic

    How to make roof cornices correctly. Installation of a dropper.

    Bearing of the cornice of the roof of sofita (vinyl siding) – Altima Stroy

    How to protect the cornice of the roof?

    Overview of a private house under the Ruza, built according to our project

    What do you think, which element is the most important for a reliable and durable roof?
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    Alexandra Fedorova

    Journalist, author of articles on construction and repair. I will help you understand the complex issues related to the choice and installation of the roof.

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