DE9306397U1 - Device for ventilation of roofs - Google Patents

Description

Description

The invention relates to a device for ventilating roofs, in which an eaves board is provided on the lower ends of the rafters, over which a plastic film is guided under the roof tiles. The plastic film is intended to prevent water from penetrating through the joints of the tiles or condensation forming under the tiles from dripping into the room to be covered. The film is placed on the rafters and secured to the rafters using counter battens. The cross battens that support the roof tiles are secured to the counter battens. So that, for example, the water collecting on the film is directed into the eaves (gutter, roof gutter), the rafters have an eaves board at their lower end that runs in the lengthwise direction of the roof, over which the film is guided into the eaves. The eaves are usually in holders, the ends of which are secured to the eaves board lying underneath the film, for example by nailing them there. If the tiles are corrugated in cross-section, as is the case with "Frankfurter pans", for example, the valleys of the tiles rest on the eaves board. The raised curvatures of the pan allow air to get under the tiles, which rises above the foil underneath to the roof ridge, where it exits through the openings provided.

If the tiles lie flat on the eaves board, for example when using "beaver tiles", then a supply air element is usually arranged along the eaves board, above the foil, which is, for example, wave-shaped, so that the air can pass under the tiles through the raised parts of the supply air element, as is the case when using "Frankfurt pans".

With these designs, there is no ventilation of the roof below the foil between the rafters, because the foil and the eaves board do not allow outside air to get between the rafters. Therefore, the rafters themselves are not ventilated by the outside air, so that condensation can form here.

The object of the invention is to provide a device which ensures ventilation of the roof rafters.

This object is achieved by the characterizing feature of claim 1. Because the eaves board is now replaced by a screen grid that at least partially follows the cross-sectional shape of the eaves board, i.e. has an approximately trapezoidal cross-section, air can pass through the openings of the screen grid below the film through the screen grid between the roof rafters and flow below the film between the roof rafters up to the ridge.

The screen grid preferably consists of a metal sheet, for example an aluminum sheet or a sheet made of an aluminum compound, in such a way that it can withstand the pressure load from the roof tiles on top and, if applicable, the brackets for the eaves. The grid is therefore angled vertically downwards at the front and back and rests on the roof rafters with its edge surfaces running in the direction of the rafters.

The base of the sieve can remain open so that the sieve grid can be used despite the angled front and rear parts

and the angled edge surface supports can be folded from a single flat piece.

Using the holes in the screen grid, it can be nailed to the roof rafters with its edge surfaces lying on the roof rafters. To attach a holding device for the eaves, the holding device is advantageously placed on the screen grid. To ensure that the screen grid is not damaged when the eaves holder is nailed on, and in particular that it does not bend, in a further embodiment of the invention, suitable wooden wedges can be inserted into the cross-section enclosed by the screen grid, which fill the space between the rafters and the surface of the screen grid.

Further details can be found in the subclaims.

The drawing shows an embodiment of the invention, namely

a cross section through a roof section with

inserted sieve grid;

the view of the screen grid towards the

Arrow II of Fig. 1;

the view of the screen grid in the direction

of arrow III of Fig. 1;

a section along line IV-IV of the

Fig.3;

a modified embodiment;

a detail of Fig. 5;

a modified detail of Fig. 5.

Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

According to Fig. 1, a film (2) is placed on the roof rafters (1). The film (2) is held on the roof rafters (1) using counter battens (20). Cross battens (21) are attached to the counter battens, which support the roof tiles (23) by placing them behind the battens (21) with studs (24).

The film (2) is guided over a screen grid (3) into an eaves (4) so that water collecting on the film runs into the eaves (4) and is drained away from there. The screen grid (3) has the same cross-section as the eaves plank used previously, except that a cavity (5) is now provided in the appropriately folded screen grid (3), which is closed off at the front by a bent vertical surface part (6) and at the back by a bent vertical surface part (7). The parts (6 and 7) are followed by bent edge surfaces (8 and 9) of the screen grid (3) running in the direction of the roof rafters (1). The screen grid (3) can be nailed to the roof rafters (1), for example, through the holes in the edge surfaces (8 and 9).

With this design, the air can pass through the front surface part (6) of the screen grid in the direction of the arrow (10) through the rear surface part (7) of the screen grid (3). From here, the air can reach between the rafters (1) beneath the foil (2) to the roof ridge in order to be discharged in a suitable manner.

Wooden wedges (11 and 12) can be inserted into the trapezoidal cross-section of the screen grid (3), namely into the cavity (5), in such a way that they fill the space between the roof rafters (1) and the surface (3a) of the screen grid (3) along the roof at several points. In this way

The retaining bar (13) of the eaves bracket (14) can be nailed using wooden wedges (11 and 12). The eaves (4) is inserted into the holders (14). The nails can then be guided through the holes in the screen grid (3). When nailed in this way, the screen grid (3) does not bend in its surface (3a) and is not damaged in this area.

The screen grid (3) thus ensures the passage of air and ventilation of the roof rafters (1) beneath the foil (2). At the same time, it prevents insects and the like from penetrating the floor space covered by the roof, as long as the holes (15) in the screen grid are kept small enough. The parts (6 and 7) of the screen grid (3) also prevent snow or the like from being blown through the screen grid (3) into the roof space under the roof.

Fig. 5 shows a screen grid design for use with a roof overhang (30). In the rafters of the overhang there is a recess (31) in which tongue-and-groove boards (32) are usually arranged for aesthetic reasons. The tongue-and-groove boards extend to the house wall marked (33).

With this design, the screen grid (3) can be extended until it reaches the house wall (33) so that the film (2) cannot lie on the tongue and groove boards (32) and prevent the air from escaping from the screen grid (3).

If a sieve grid (3) according to the embodiment according to Figures 1 to 4 is used, in a further embodiment of the invention a second sieve grid (35)

be arranged behind the screen grid (3) so that the film (2) also runs over this screen grid (35). The air now passes through the front and rear surfaces of the screen grids (3 and 35) in the direction of the arrows (36) between the roof rafters (1).

If a second sieve grid part (35) is used, its cross-section can be designed as a U-shaped sieve grid (37), as shown in Fig. 6. The U-legs (38) of this sieve grid are supported on the tongue-and-groove board connection (32), or with their front leg on the rear edge surface (9) of the sieve grid (3). However, the sieve grid (37) can also have edge surfaces angled to the front (39) and rear (40) as shown in Fig. 7, with which it rests on the tongue-and-groove board connection or with its rear edge on the tongue-and-groove boards and with its front edge on the edge of the sieve grid (3). The sieve grid (37) can be attached to the tongue and groove boards (32) or the roof rafters (1) using nails through the holes in these angled parts (39, 40).

The ventilation according to the invention is particularly advantageous if, for the purpose of thermal insulation, thermal insulation panels are arranged under the roof rafters or even extending into the roof rafters, so that hollow spaces remain between the rafters, as is also the case with the overhang. The sieve grid (3) according to the invention, optionally in conjunction with the sieve grid (37), brings about ventilation into these closed air spaces remaining between the rafters without any special measures.

Reference numbers Roof rafters 1 foil 2 Screen grid 3 Surface of the sieve grid 3a eaves 4 cavity 5 Screen surface part 6 Screen surface part 7 front edge surface of the sieve grid 8th rear edge of the sieve grid 9 Arrow 10 Wooden wedge 11 Wooden wedge 12 web 13 Eaves bracket 14 Holes 15 imaginary base of the trapezoidal 16 Screen grid (3) Counter battens 20 Crossbars 21 Roof tiles 23 Holding knobs 24 Roof overhang 30 Recess of the roof overhang 31 Tongue and groove boards 32 housewall 33 Screen grid 35 Arrows 36 Screen grid 37 ü-leg 38 front edge surfaces 39 rear edge surfaces 40 9493 21 /en Kn

Claims (9)

Patent Attorney Dipl.-Math. Siegfried KnefelWertherstr. 16, PO Box 1924, 6330 WetzlarTelephone 06441/46330 - Fax 06441/48256 H 6 Klaus Henn, Breslauer Straße 1, 6345 Eschenburg 1 Device for ventilating roofs Protection claims 1. Device for ventilating roofs, in which an eaves board running transversely to the roof is provided on the lower ends of the rafters, over which a plastic film covering the roof tiles is guided, characterized in that the eaves board is formed by a sieve grid (3) which can be fastened between the rafters (1) and the film (2) on the rafters (1) and has an essentially trapezoidal cross-section. 2. Device according to claim 1, characterized in that the side of the sieve grid (3) (base area of the sieve grid) facing the roof rafters (1) is open. 3. Device according to claim 2, characterized in that the sieve grid (3) has edge surfaces (8, 9) angled in the direction of the roof rafters (1). 4. Device according to claim 3, characterized in that the sieve grid has approximately vertically extending angled sieve surface parts (6 and 7) at the front and rear, which open into the angled edge surfaces (8, 9). 5. Device according to claim 1, characterized in that the sieve grid consists of a single, suitably folded, flat piece. 6. Device according to claim 1, characterized in that the sieve grid (3) consists of a perforated, flat metal sheet. 7. Device according to claim 1, characterized characterized in that the sieve grid (3) consists of aluminium or an aluminium compound. 8. Device according to claim 1, characterized in that the sieve grid (3) consists of plastic. 9. Device according to claim 1, characterized characterized in that wooden wedges (11, 12) filling the cavity (5) of the sieve grid (3) are arranged at a distance from one another.