Filly in the rafter system - photo, dimensions

Filly in the rafter system - photo, dimensions The filly in the rafter system - photo, dimensions

In the process of roofing design, it is recommended to pay special attention to the distance between the edge of the eaves and the building wall. If such a gap is up to 0.4 meters, then it should be taken into account that the water that flows from the roof during precipitation will immediately fall on the blind area and the wall, and at the same time they will blow into the space that is under the roof terrible wind gusts.

The filly in the rafter system is used quite often, and through it it is possible to equip the overhang of the required dimensions.

A filly on the roof - what is it?

A filly is an element that is on the roof frame.

The purpose of such an element is to lengthen the legs of the rafters, which rests on the Mauerlat of a building made of blocks or bricks and is located on the upper harness of a building made of timber or logs. Simply put, the filly in the rafter system is a piece of board that is used as a continuation of the rafter systems, resulting in an overhang on the roof. As a rule, such an element is suitable for a rafter system in the event that the rafter leg does not have the required size, and this can prevent the appearance of light.

In order to equip the filly on the rafter system, it is recommended to select boards with a much smaller cross-section than a board that is suitable for the rafter system. Moreover, due to the application of this approach, it is possible to significantly facilitate the installation work.

The use of such material in the rafter system makes it possible to significantly facilitate the installation of the construction and further repair work of the roof frame. Moreover, it is possible to significantly reduce the load level on the base and load-bearing walls.

This is due to the following:

  1. Filly in the rafter system - photo, dimensions Since the length of the rafter leg will be where less, then you do not need to calculate the overhang beyond the wall plane by 0.4-1 meters for arranging the overhang in the future, as a result, the design is quite simple, short and not so expensive.
  2. Installation work is carried out on boards that are thinner than the rafter type material, which is suitable for arranging a rafter system, as a result of which the structural weight will be much less.

  3. If necessary, it is possible to fairly easily align the overhang line, and in the event that a construction error is allowed, it will be enough to replace such an element.
  4. If, during operation, the eaves overhang support begins to rot, then it will be enough to replace the damaged elements than to carry out repair work.

Moreover, it is important to consider that filly in the rafter system can be used in the construction process as a decorative element.If necessary, such a product used in the rafter system can be given any shape, make it as decorative as possible. Please note that for a better understanding it is recommended to see how such filly look in the photo.


Construction of roof filly

Eaves overhang, which has a width of 0.9 to 1 meter is easy enough to install. To do this, you need to fix the filly on the roof, using a rafter for this. In this case, the rafters must be mounted on the Mauerlat or on the top harness. The fillets are an extension of the rafter system, as a result of which, during the installation work, the crate, waterproofing material and roof covering must be mounted on them.

Before installing the deck, it is recommended to install a cornice board along the edge of the roof, on which the drip will be located in the future. After the roof is fully installed, it is required to sew up the overhang on the eaves. To do this, you can choose jointed boards or soffits. The placement must necessarily be perpendicular, and at the same time there must be a small gap, due to which ventilation will not be disturbed. Due to the circulation of air, moisture will be removed, as a result of which the putrefactive process of wooden elements can be prevented.

If you plan to install an overhang, the length of which is more than 1 meter, then the filly on the roof will experience quite heavy loads. In order to prevent roof collapse, it is recommended to support the elements of the rafter system on the cantilevers, which are beams placed in a vertical position.

As a rule, consoles are also separate, and they do not have to be connected by means of a horizontal connection along the common perimeter of the ramp. In this case, the filly is able to rely on the Mauerlat, and as practice has shown, the choice of design will fully depend on the width of the eaves. It is recommended to use the consoles if the material for making the filly is more than 1.

5 meters.

Dimensions of the element

You know why you need a filly in the rafter system, and in case a decision was made during the construction work to use such elements for the rafter system, it is recommended to correctly make calculations, as well as calculate the length of the filly. As practice has shown, it is best to carry out installation work after the roof has been installed. When calculating the required length of parts, you need to understand that a margin of 0.3 to 0.

5 meters must be made, because the fastening will be overlapped. Only after that you can start choosing building materials for future work. In this case, it is permissible to use boards with a cross section of 5 * 15 cm, and at the same time, a size of 12 * 4 cm or 10 * 3 cm is perfect for creating fillies.Most experts advise giving preference to materials from coniferous wood species. In this case, it is required to ensure that the moisture level varies within 8-10%.

The elements should be free of knots and rotten fragments.

Good advice! After all the parts have been prepared and adjusted to the dimensions, it is recommended that all elements be carefully treated with an antiseptic composition, which makes it possible to prevent the formation of rot and fungus in the operational process.

How to make filly for rafters

Roofing works, where it is planned to install filly on elongated rafters, is recommended to be carried out using standard technology. After the rafters are installed, you need to go to the preparatory stage of the remaining elements, the number of which should be equal to the legs used. The dimensions of the elements fully depend on the overhang width, to which the order of 0.

3-0 should be additionally added. 5 meters to create an attachment. One rule should be remembered - the longer the filly used, the more it is required to leave a margin for fixation. Only this method can achieve the required level of rigidity and fully exclude the subsidence of the structure alignment. It is recommended to use boards with the desired section or bar trim.

The step-by-step installation work algorithm looks like this:

  1. Filly in the rafter system - photo, dimensions The first step is to prepare a template according to which the elements used during construction will be cut. After that, each cut must be processed with a fire retardant composition. Installation is required to overlap the rafter system - approximately 0.3-0. 5 meters, and after that the upper ends of all elements need to be aligned.

    For fastening, you can use polished or even simple nails. In order to ensure high-quality adhesion, up to 4 nails should go to each node, which is important to hammer in a couple of nails on each side. In order for the fastening not to weaken during operation, the ends of the studs must be bent.

  2. Initially, the fillets for the rafter system must be fixed at the edges, on the slope, and the dimensions of the overlap must be measured as carefully as possible. It is required to pull the cord between such elements, and then carry out the installation work further.

    This method is perfect for stingrays that are short, because the cord used should not sag.

  3. If in the construction process the overhang assumes the presence of consoles, then the fixation of the fillies should be carried out flush from the side of the horizontal beam. In order to strengthen the structure, it is recommended to additionally mount an accelerated or even continuous crate, which makes it possible to achieve the desired level of rigidity.
  4. After the construction work has come to an end, it is required to hem the cornice.

Now some goodies.

Recommendations and useful tips

When performing construction work, it is necessary to take into account that fillets on the surface of the rafters must be cut off at the same level with the wall of the building. The length of the board used for arranging the overhang fully depends on the desired size. The length of the filly cornice should be increased by 0.3-0. 5 meters, because the works will be overlapped.

Moreover, this approach provides good fixation.

The elements used must be made of the following types of wood:

  • Cedar.
  • Pine.
  • Larch.

It should be noted that the operational period will directly depend on the quality of the materials used in the construction of the roof and the technology used.

It is undesirable to use a croaker.


The filly in the rafter system plays an incredibly important role, and as a result, it is recommended to approach the work with great responsibility. During the installation process, the best option would be to follow the step-by-step instructions and recommendations of experienced craftsmen - the only way you can get the desired result.

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