Cadet overhang of the roof

The roof overhang, sometimes referred to as the eaves or the cadet overhang, is one of the crucial elements of roofs that both defines and protects them. The portion of the roof that protrudes past a building’s walls and offers shade, security, and visual appeal is known as the overhang.

The cadet overhang’s main purpose is to protect the building’s outer walls from the weather, especially rain and sunlight. It keeps water from trickling down the building’s sides by extending beyond the walls, which helps shield the walls from mold growth and moisture damage. Furthermore, on sunny days, the overhang reduces heat gain inside the building and promotes energy efficiency by shading the windows and walls.

In addition to serving practical purposes, the cadet overhang is a key element in determining a building’s architectural style. The forms of roof overhangs vary amongst architectural traditions and geographical areas, spanning from simple to ornate. These changes may affect the building’s historical background and cultural significance in addition to its outward look.

In addition, the cadet overhang’s dimensions and style may have an impact on the building’s internal lighting and general structural longevity. When overhangs are properly designed, they can protect external doors and windows from the elements and improve the diffusion of natural light inside the building.

It’s important to comprehend a roof’s cadet overhang for both practicality and aesthetics. In addition to providing shade from the sun and rain for the building, this extension past the walls is essential in keeping water away from the foundation and averting possible damage. Beyond its usefulness, a building’s architectural appeal is improved by the cadet overhang, which adds depth and shadow to the building’s overall attractiveness. By investigating its dimensions, composition, and upkeep, homeowners can make the most of this feature to safeguard their properties and improve their curb appeal."

Types of cornice overhangs

The developer’s desire alone determines whether the overhangs are finished. Functionality is unaffected, but only insofar as all building codes and regulations’ recommendations are faithfully followed.

Cadet overhang structures table

Professional advice is required before making a final decision, and you should consider the roof’s appearance as well as the necessity of ensuring that it operates as recommended.

Prices for various types of construction boards

Construction boards

Materials for binder

There are a variety of building materials available for finishing the cornice overhang, including both affordable and high-end options. It is advised to consider several buildings’ locations as well as the building’s style when making your selection.

    Siding. The most popular material. The main advantage is the low price and ease of installation. Plastic panels are easily cut, if necessary, they can be slightly bend. Industry offers customers special panels for binder, this is the so -called siding for cornices. Its difference from ordinary – the presence of perforated ventilation holes. Siding can be purchased various sizes and color solutions.

Cornice siding varies depending on whether a perforation is present.

For gearing cornices, natural lining is an excellent choice.

Licking overhangs is another use for galled steel, though this is a rare occurrence.

The cornice’s intricate copper hewing appears incredibly beautiful and costly.

Siding prices


How to make a cornice overhang

The cornice overhang is frequently too narrow, and the ends of the rafters frequently protrude slightly beyond the bearing walls. In these situations, boards measuring 100 by 50 mm in cross section are used to extend the rafters. We refer to these components as filly.

Extending the beams using filly

Calculator calculation of lengthening rafters for a cornice overhang

We’ll take the most challenging option, for instance, where the roof needs efficient ventilation to remove condensate because it is insulated with mineral wool. An ethylene-butylcrelat film with two vapor-holding layers of copolymer and polypropylene is used to form a vapor barrier layer.

Step 1: Secure the membrane from the attic’s interior. The films are initially secured with a stapler, and future technology will be employed based on the attic room wall lining technique. The joints are firmly cemented, and ventilation pipe and chimney outputs are additionally sealed. The internal vapor barrier is fixed to the walls or the roofing, so it cannot change to a cornice overhang.

An internal protective membrane is affixed.

Step 2: Place the support board in the space created by the rafter legs. The element’s width should meet the step of the rafter legs, it should be in the same plane as the facade walls, and it should account for the size of the insulation materials. Because the sizes match, there is no need to cut to fit the niche width, which greatly facilitates and speeds up the work while also greatly improving the insulation quality. Self-tapping screws or nails are used to secure the support boards to the rafter legs; two fasteners are required for each direction.

Place the support boards in the spaces between the rafters.

Step 3: Create a level foundation for installing a waterproof and windproof membrane by lowering the rafters’ height by the length of the cold overhang. This is carried out in phases.

  1. Make cuts on the rafter leg of the overhang. The depth of the cuts should be such that the plane of the boards nailed to them is located on the same level with whole rafter legs.
  2. Gently, gently, remove the extra pieces with a chisel or chisel, align the surface of the rafters. There is no need to do it perfectly even, these places are still closed with boards. Pay attention to that their surface is located at the same level or slightly below rafter legs.

Make incisions at the rafters’ ends.

Some unskilled builders arrive at the rafters without considering the level of placement of the boards on the overhangs. They are situated above the plane in this position, where the membrane bends upward. Condensate cannot be removed freely, causing a significant amount of water to continuously build up at the intersection. The longevity of wooden structures is severely impacted by these rafter system operating conditions.

Sensible guidance. Insulation should terminate on a reference board; it is not required to insulate a cornice overhang. Furthermore, it is positioned across from the Mauerlat, or Facade Wall.

Step 4: Use overlaid boards to create a cornice overhang. They are fastened with nails to the rafter legs’ prepped areas. During the procedure, check the position; if the boards protrude above the leg plane, the niches need to be deeper. We emphasize once more how crucial it is that condensate not remain on the membrane for an extended period of time. The rafter system will become wet as the water flows over time.

Fasten the planks firmly to the beams.

Self-tapping screws can be used to fasten the boards, but smooth nails are a lot quicker and simpler. This element is not under much load, and any metizes ensure a strong enough fixation.

Step 5: Screw the frontal (cornice) board into position. It needs to be fastened to the rafter legs’ ends. The ends of the rafter system are strictly positioned in one plane and aligned on the rope during installation. If length discrepancies are discovered, wooden stands can be placed between the board and legs. It’s up to you to make sure they have enough sizes and are dry. Otherwise, unintended cracks may emerge from raw, dry nails that crack too small stands.

Put in a frontal board

6. Purchase the dropper. He carries out two tasks: he holds the lower edge of the water-protective membrane and retrieves water from outside the walls. The dropper has a 0.45 mm thick sheet of galvanized steel with a polymer coating on the upper surfaces. There is a five centimeter overlap between the elements; the direction of the joints is irrelevant.

On top, the dropper is screwed.

Step 7: Begin installing a windproof and waterproof membrane. Depending on the kind, it can be placed directly on the insulation or a space needs to be left open to allow moisture to evaporate. Work is done starting from the bottom and going all the way up to the skate; there is a 10 centimeter overlap, and it is best to glue the point of contact. Certain membranes feature unique adhesive compound stripes; the protective paper is peeled off and everything is prepared for glue.

Place the barrier in place.

A specific type of tape needs to be used to secure the membrane to the dropper. Experts advise utilizing butyl tape-based materials because they ensure dependable adhesion and maintain the original adhesion parameters over time. In the following sequence, the membrane is fixed.

  1. Clean the dropper of dust, its surface should be clean, dry and low
  2. Attach the tape to the edge of the element. Do not allow curvature, the tape should not sag on the bend of a metal bar.
  3. Remove protection, while slightly wrap the edge of the membrane in the opposite direction.
  4. Comers the canvas and in this position, glue it to the tape as tightly as possible.

The membrane’s lower edge needs to be adhered to the drip bar firmly.

Long-term and trouble-free use of the rafter system is guaranteed by accurate adherence to the recommended technologies. There are no general guidelines that apply to every situation in life; rather, the master must make many decisions on the spot based on the unique characteristics of each design.

Mistakes made when waterproofing the cornice node

Prices for vapor barrier

Material for vapor barrier

The subcutaneous space still needs to be ventilated, and how well this is done primarily depends on how well the cornice overhang is designed.

The longevity of the thermal insulation material and rafter system is guaranteed by adequate ventilation.

It is clear from comprehending a roof’s cadet overhang that this architectural element has both practical and decorative uses. This extension, which is situated at the roof’s edge, is crucial for safeguarding the building’s structure. It extends the life of the building by keeping moisture out of the walls and foundation by protecting the walls from rain, snow, and intense sunlight.

In addition to providing protection, the cadet overhang makes a big visual impact on a building’s overall design. Architects frequently use the overhang to give a building personality and flair, which improves the building’s aesthetic appeal. The size and style of the overhang can have a significant impact on the building’s overall appearance, whether it is emulating traditional architectural forms or giving the building a modern, minimalist appearance.

Additionally, residents can benefit practically from the cadet overhang. It provides shade and cover by extending past the walls, resulting in the creation of cozy outdoor areas like porches and verandas. This extra covered space not only increases living areas but also promotes indoor-outdoor living by encouraging outdoor activities in all weather conditions.

Video on the topic

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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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