EP0695839B1 - Curved roof covering slab or tile for ventilating an attic - Google Patents

Abstract

The cover plates comprises an air penetration region (4) which is provided between the upper side (5a) of the water fold (5) and the underside (6a) of the cover fold (6) of two neighbouring cover plates (1,2). Projections (7) are arranged on the underside of the cover which come into contact with the support surface (5b,d) of the water fold side to allow air penetration between two plates. The contact surface for the projections is formed by a flat region of the water fold side.

Description

The invention relates to a longitudinally folded roofing panel according to the preamble of claim 1.

In DE-U-83 08 864 there is one Roof covering plate for ventilation disclosed, the cover fold area as a survey such is formed that between this cover fold survey and the covered side fold of the neighboring one Roof covering plate a ventilation gap remains free that starts from the roof interior and into the outside atmosphere flows. There is a ventilation grille in the ventilation gap used, but not in all cases should be required. Shape and material of this Ventilation grilles can experience numerous modifications, the ventilation grille also one from the top fold down standing, slotted rag of the brick can.

The ventilation grille and the one not described in detail Rag have the disadvantage that this Roofing slab due to the elevation in the Cover fold area entirely from the cross-sectional shape of the neighboring, not for ventilation Roof covering plate deviates and thus the look of the Roof in a conspicuous manner, namely by the numerous humps of the surveys. With certain Wind directions arise in the not designated Ventilation gap a dynamic pressure, which nullifies the ventilation makes. In this respect, ventilation is only for certain Wind directions effective. However, all wind directions towards the ventilation gap always lead to one Back pressure of different sizes.

In another known roofing sheet according to EP-A-0 432 784 have two top fold ribs both ends raised on the one in between to make the part lying freely suspended and thus concave curvatures of the cover fold part due to the To be able to catch the manufacturing process. As from the 3 shows the ideal case of the installation, is the height difference between the free floating Elevations and the bearing surfaces of the grooves such low that it forms a high flow resistance, so that a ventilation worth mentioning does not take place. There the top seam ribs are freely movable in the grooves, the gap of Fig. 3 when laying the Interlocking tiles are also closed so that from the gap an air outlet is no longer possible. In any case would be pure ventilation with this roof covering plate random and does not go beyond the ventilation options conventional bricks due to manufacturing technology or errors caused by the installation. A defined ventilation is not disclosed.

From EP-A-0 585 737 there is one Roofing tile with an overflow opening disclosed to be a flow channel for penetrating Precipitation or condensation from the bottom of the brick lying on the visible side of this brick to lead in its midfield. In this context two crenellated notches become one Continuation rib described because this is said to Vents for better ventilation of the Form overflow. These notches or more precisely said these deepenings serve as sole purpose, a water accumulation at the level of the water passage opening of the Improve overflow if at this point Water stagnation should occur. For this reason, this should Overflow opening can also be a nozzle opening. The specialist This publication is only and exclusively about the Creation of a roofing sheet that is so tight before penetrating precipitation in the form of rain, snow or sleet that the roof pitch of Can fall below 22 °. Effective ventilation is not revealed.

Another well-known roof covering plate (see EISENBERGER double interlocking tile, model E 20) points to the Front of her foot on a sieve-like formation, in which the air passage area consists of the sieve openings. This roof covering plate for ventilation has the disadvantage that at about vertical and also at diagonal flow to the roof ridge at the sieve-like openings creates a dynamic pressure, which aeration of the underlying roof space either hindered or even thwarted. These sieve-like types achieve the best ventilation effect Inserts with a negative pressure, such as on the leeward side due to a flow separation in arises near the ridge. The same applies to the fan brick of the applicant's hollow brick program with molded dome-like slotted screens and for the fan tiles with grilles TRADI 13 and RENOV 13 the Pottery factory Laufen AG. CH-4242 Laufen and the fan brick Z-2000 from Tonwerke Kandern GmbH, D-79400 Kandern with separate mesh and sieve-shaped inserts.

Furthermore, a concrete roof tile for ventilation is known from a prospectus sheet "concrete roof tiles" by the applicant, which is provided with a hood ventilation made of plastic inserted into an opening in its central fold.

This concrete roof vent is largely independent of the air flow direction, but with the Disadvantages of a multi-part, complicated shape and an unpleasant visual conspicuous, because the Plastic insert protrudes over the surface of the roofing panels and an inhomogeneous visual impression leaves.

And finally, a fan tile from the "Fan tile" brochure from the company Laufen is known, which is a cant has at its foot end and is provided with an opening over almost the entire width of its foot, in which a sieve-shaped insert is inserted. This sieve-like insert protrudes with its underside for holding penetrating precipitation relatively far below the bottom towards the head side, which in turn the Flow path and the air to be discharged from the roof space extended and higher pressure losses. Especially In the case of flat roofs, rainwater can nevertheless occur if the back pressure is present on the windward side penetration. Although this fan tile has an impact surface that is favorable for a detachment process, it is also included suffers from the disadvantage of a lower part made of polypropylene plastic or metal.

Starting from this prior art, the object of the invention is a longitudinally folded roof covering plate of the type mentioned to create ventilation, on the one hand visually inconspicuous with the same ventilation roofing panels, but also with conventional roofing panels of the same type Form is relocatable, largely independent of the wind direction due to relatively large flow cross-sections always ensures effective ventilation and yet the penetration of precipitation into the attic safely prevented.

This object is achieved in connection with the generic term mentioned in the preamble of claim 1 in that that on the underside of the cover fold side of the Roofing tile several spaced apart Cams are formed as projections, and that on the Top of the rebate side of the roofing slab several spaced apart and across the plane of the Bearing pedestal protruding from the top of the water rebate side are integrally formed, each transverse to the longitudinal axis of the Roofing tile from two protruding Stop edges are limited, being in the covered position the projections of the one roof covering on the Bearing bases of the adjacent Roofing slab leaving Vents between the two Put on roofing sheets.

In contrast to the prior art, this design now for the first time creates a ventilation passage area between the top of the water fold side of one and the bottom of the cover salt side of the other neighboring Roof covering plate created, which is visually perceptible only with special attention. Ventilation technology this arrangement is linked to the incomparable advantage that regardless of the direction of flow Outside air always has a venting effect due to signs of detachment of the outside air in the vicinity of the longitudinal fold or the foot end that acts as a baffle edge is ensured. The greatest venting effect is with an inflow of the roof parallel to the ridge longitudinal axis. However, even when there is a flow perpendicular to the ridge longitudinal axis depending on the air speed, a suction effect and therefore ventilation of the roof space below ensured, in addition to the signs of separation of the air a Venturi effect in the channels between The water seam and top seam sides of the two neighboring roofing panels are added.

Another advantage of this longitudinally folded roofing sheet is that the appearance of its surface of a conventional longitudinally folded roofing sheet of the same kind by a layperson not or hardly is distinguishable and a multi-part embodiment is unnecessary, since the projections causing the air passage slots are cohesively connected to the relevant roof covering plate for ventilation and in one Operation in the pressing of such roofing sheets are made. Through the longitudinal folds on the water rebate side penetrating precipitation is hermetically prevented from entering the roof space and below fully exploited the specific function of the water rebate side towards the eaves.

It is understood that the roof covering plate according to the invention with convective ventilation due to differences in density the air in the roof space has a better ventilation effect due to the relatively large air passage slots than the conventional roofing tiles described in the prior art.

Furthermore, the roof covering plate according to the invention can be designed as a ridge connecting tile, that her head with a flat support surface for the ridge tile and with a parallel to the longitudinal axis of the ridge Baffle edge is provided to prevent precipitation.

And finally, the roof covering plate according to the invention also allows its head to be designed as a pent roof end tile to.

The Support surfaces for the projections are from the above formed the plane of the water rebate surface bearing base, which is transverse to the longitudinal axis of the roofing slabs is limited by two projecting stop edges. There is a possibility of moving and good adaptability of such a roof covering plate for ventilation with the adjacent roof covering plate same type, with the protrusions on the bearing base protruding beyond the level of the water rebate surface Place on a roof covering plate for ventilation.

Due to the stop edges, the projections can be inside a corresponding tolerance range.

Between the projections, which advantageously as a cam in the form of a truncated pyramid with a square or rectangular base area, the air passage areas are in the form of air passage slots, which are each several centimeters long and therefore also in connection with the height of the projections for a cheap one Ensure air passage.

According to an advantageous development of the invention, the areas of the bearing base and stop edges are approximately are of the same width and run at an angle of inclination between 0 ° and 30 ° to the horizontal in the direction on the foot of the roofing slabs. The purpose of this tendency is to have falling precipitation below it To allow gravity to flow towards the eaves. Since the protrusions on the Placing bearing bases on a surface area of the water rebate prevents the water rebate side with its raised, internal fold edge and concealed by the neighboring roof covering panel penetration of precipitation into the roof space, which is the basic purpose of each water rebate side corresponds

Each of the roofing panels for ventilation has an inner and at the top of its head an outer head rib and on the underside of her foot an inner and outer foot rib, which are about to each other run in parallel. The inner and outer head rib as well as the inner and outer foot rib are in their edge areas either rounded or beveled into a trapezoidal cross-sectional shape. For a favorable runoff of precipitation To allow between the outer and inner head rib is the inner head rib on the water rebate side provided with a drainage opening adjacent. Likewise, the water fold is at its base of the roofing slab facing end also with a drainage opening to the water rebate side of the adjacent Roof covering plate provided. This can penetrate precipitation from the area between the outer and inner head rib to the water seam side and from there through the drainage opening there flow away from the water rebate side near the foot to the roof covering plate adjoining it in the direction of the eaves.

The roof covering plate for ventilation according to the invention is on its underside near its head two protruding lugs for mounting on a roof batten and in the adjoining one, just before the ribs area to ensure a correspondingly high load capacity with both lengthways and with provided transverse stiffening ribs. From the inside of two stiffening ribs running parallel to the longitudinal axis branch three transverse expansion rib pairs towards each other at different heights from, the one longitudinal stiffening rib below the water seam side and the other approximately in Center area of the bottom is arranged. The arrangement of these stiffening ribs is not only for reasons of strength, but also against a fluidic background of the ventilation, because this means the underside of the roof covering slab in the area of the top rebate smooth and without dents which hinder the ventilation flow is trained. This smooth area therefore has a low-resistance air guiding function for those from the attic air to be extracted.

The roof covering plate according to the invention corresponds in size and circumferential contour to a conventional roof covering plate and is either together with other identical roofing slabs of this type for ventilation or can be installed with conventional roofing tiles of the same circumferential contour. These roofing tiles for ventilation are made of clay and are in a conventional pressing process in the corresponding under and Manufactured upper forms. In principle, however, it is also possible to use roofing panels of this type in a pressing process to manufacture with concrete. because the longitudinally folded surface is relatively smooth and the underside with relatively flat, is conical shapes.

Fig. 1 die Draufsicht auf ein Dach, welches in der ersten Reihe in Firstnähe von Dacheindeckungsplatten zur Entlüftung und in der zweiten Reihe von normalen Dacheindeckungsplatten eingedeckt ist, während in der dritten Reihe alternierend Dacheindeckungsplatten zur Entlüftung und normale Dacheindeckungsplatten verlegt sind,

Fig. 2 eine perspektivische Explosionsansicht dreier senkrecht zur Firstlängsachse verlegter Dacheindeckungsplatten, von denen die beiden unteren solche zur Entlüftung sind,

Fig. 3 bis 5 die Draufsicht, die Unteransicht und die Seitenansicht einer Dacheindeckungsplatte zur Entlüftung,

Fig. 6 eine Schnittansicht entlang der Linie VI-VI von Fig. 3,

Fig. 7 eine Schnittansicht entlang der Linie VII-VII von Fig. 3,

Fig. 8 eine perspektivische Draufsicht einer Dacheindeckungsplatte zur Entlüftung in einer gegenüber der Fig. 2 vergrößerten Darstellung,

Fig. 9 eine perspektivische Ansicht in teilweisem Schnitt von zwei benachbarten Dacheindeckungsplatten zur Entlüftung und einer in Firstrichtung sich anschließenden normalen Dacheindeckungsplatte,

Fig. 10 eine Schnittansicht entlang der Linie X-X von Fig. 9,

Fig. 11 eine Schnittansicht entlang der Linie XI-XI von Fig. 1 durch drei benachbarte Dacheindeckungsplatten, von denen die mittlere zur Entlüftung ausgebildet ist und

Fig. 12 eine perspektivische Draufsicht auf eine normale Dacheindeckungsplatte, die in Verbindung mit einer erfindungsgemäßen Dacheindeckungsplatte zur Entlüftung verlegbar ist.

Several embodiments of the invention are shown in the drawings. Show:

1 is a top view of a roof, which is covered in the first row near the roof covering panels for ventilation and in the second row of normal roof covering panels, while in the third row alternating roof covering panels for ventilation and normal roof covering panels are laid,

2 shows an exploded perspective view of three roof covering plates laid perpendicular to the ridge longitudinal axis, of which the two lower ones are for ventilation,

3 to 5, the top view, the bottom view and the side view of a roofing plate for ventilation,

6 is a sectional view taken along the line VI-VI of Fig. 3,

7 is a sectional view taken along the line VII-VII of FIG. 3,

8 is a perspective top view of a roof covering plate for ventilation in an enlarged view compared to FIG. 2,

9 is a perspective view in partial section of two adjacent roofing panels for ventilation and a normal roofing panel adjoining in the ridge direction,

10 is a sectional view taken along line XX of FIG. 9,

Fig. 11 is a sectional view taken along the line XI-XI of Fig. 1 through three adjacent roofing sheets, the middle of which is designed for ventilation and

Fig. 12 is a top perspective view of a normal roofing sheet that can be installed in connection with a roofing sheet according to the invention for ventilation.

1 near the ridge 3 has a number of longitudinally folded roofing panels according to the invention 1 for ventilation as well as in the row below longitudinally folded, conventional roofing sheets 2 with which the roofing panels 1 for ventilation - as provided in the third row - together in a series can be laid alternately. This makes it possible to individual roofing panels 1 for ventilation, for. B. immediately in front of chimneys, roof windows, ridges or the like.

According to FIGS. 2, 8 and 10, the air passage area 4 is located between the top 5a of the water rebate side 5 and the underside 6a of the cover fold side 6 of two adjacent roofing panels the underside 6a of the cover fold side 6 projections 7 are arranged on a support surface 8 of the water fold side 5 of the roof covering plate adjoining on the long side, leaving through slots 4a. There is the bearing surface 8 for the projections 7 from a protruding beyond the plane 5c of the top 5a of the water fold 5 Bearing base 5d of the transverse to the longitudinal axis 9 of the roofing plate of two protruding Stop edges 10 is limited.

As can be seen in particular from FIGS. 2, 3, 5 and 8, each roof covering plate 1 as projection 7 on four cams, which have the shape of a truncated pyramid with either square or rectangular Have floor space. At the same height to the longitudinal axis 9 of the roofing panels 1, these are on the Water fold side 5 provided with bearing bases 5d.

As can be seen in particular from FIG. 3, the areas of bearing base 5d and stop edges 10 are approximately the same broadly designed and run for the aerodynamic drainage of penetrating rainwater or condensed water at an angle of inclination α between 0 ° and 30 ° to the horizontal 11 in the direction of the foot 12 of the roofing plate 1.

As can be seen most clearly from FIGS. 3 and 5 to 7, the roof covering plate 1 has on it Top 1a at the level of her head 13, an inner head rib 14 and an outer head rib 15 and on the underside 1b of her foot 12 an inner foot rib 16 and an outer foot rib 17, which run approximately parallel to one another The inner and outer head ribs 14, 15 are rounded in their edge regions or have a trapezoidal cross-sectional shape are provided.

According to FIG. 3, the inner head rib 14 is adjacent to the water fold side 5 with a drainage opening 18 Provided Furthermore, the water fold side 5 is also at its end facing the foot 12 with a drainage opening 19 to the adjacent roofing slab.

According to FIGS. 4 and 5, the roof covering plate has on its underside 1b near its Head 13 two projecting lugs 20 with which it can be held on a roof batten, not shown. By doing from the head 13 towards the foot 12 adjoining area are the roofing slabs according to FIG. 4 with two longitudinal stiffening ribs 21, 22 and with three transverse stiffening rib pairs 23-25 provide the different height ranges from the longitudinal stiffening ribs 21,22 towards each other branch off. One of the longitudinal stiffening ribs 22 is below the water fold side 5 and others 21 are arranged approximately in the central region of the bottom 1b. As a result, the underside 6a of the cover fold side 6 to on the projections 7 are kept free from flow-restricting ribs.

As can be seen from FIGS. 1 and 2, the roof covering plate 1 according to the invention corresponds to ventilation in size and circumferential contour of a conventional roofing sheet 2 and according to FIG. 1 is either together with other identical roofing panels 1 for ventilation or with conventional roofing panels 2 identical circumferential contours can be laid.

In Fig. 12, a conventional roofing sheet 2 is shown, in which with those described above Figures corresponding parts are designated by the same reference numerals. This conventional roofing tile 2 differs from the roofing sheet 1 according to the invention essentially in that at the Underside 6a of the cover fold side 6, the projections 7 of the roofing panel 1 according to the invention are also missing as on the water fold side 5, the bearing base 5d with the stop edges 10. Instead, the water fold side 5 from its inside to the outside three folding ribs 31, 39 which run parallel to one another (as in the roof covering plate 1) and a further folding rib 38. The folding rib 39 is identical to the folding rib 39 of the invention Roofing plate 1 (see Figures 2 and 9) and prevents rainwater from entering into the roof space 28. In the roof covering plate 1 according to the invention, however, the middle folding rib 38 is missing whose place the bearing base 5d with the stop edges 10 have entered. Thus, the bearing surface for the fold rib 40 (see FIG. 11) of a conventional roofing panel 2 either from the plane 5c between the inner seam rib 31 and the middle folding rib 38 or, in the case of a roof covering plate 1 according to the invention, from the bearing base 5d formed in connection with the stop edges 10.

The venting principle is described below with reference to FIGS. 1, 10 and 11:

Fig. 10 shows the cross-sectional view along the line X-X of Fig. 9 of two adjacent roofing sheets 1 for ventilation, as they are laid next to each other in the first row of the ridge 3 of Fig. 1.

The cheapest ventilation is parallel from the roofing panels 1 with a flow direction of the outside air reached to ridge 3 along arrow 26, as can be seen from FIGS. 1 and 10. With these flow conditions there is a flow separation of the outside air in front of the cover fold side 6, as shown by arrow 27 in FIG. 10 is identified. As a result, the outside air experiences a speed increase in the following area. This According to the Bernoullian flow equation, the speed increase is in the area below with a corresponding pressure drop connected. Due to the resulting vacuum, the under Roofing panels 1 located roof space 28 according to the flow lines 29 drawn in air. This air reaches the underside 6a of the cover fold side 6 between the projections 7 through the air passage slots 4a (see FIG. 8) and the air passage slots 30 between the lower edge 6b and the adjacent side surface 31a of the adjacent rebate 31 of the adjacent roofing slab 1 or 2. The ventilation in this flow direction arrow 26 is most effective because after passing through the air passage slots 30, the air from the Roof space 28 does not undergo any further deflection, but is entrained in the outside air in the direction of flow (arrow 26).

But also opposite to this flow direction, namely according to arrow 32 of Figures 1 and 11, takes place an extremely effective ventilation of the roof space 28. According to FIG Outside air shortly before the fold 31 a flow separation of the outside air with a corresponding increase in speed with simultaneous decrease in pressure. As a result, the air from the roof space 28 is passed along the flow lines 29 the air passage slots 4a sucked out according to Figures 2 and 8 until they between the gap 33 between the Longitudinal fold 40 on the cover fold side 6 of a normal roof covering plate 2 and the side surface 31a of the adjacent one Longitudinal fold 31 of the roofing plate 1 according to the invention emerges and from the outside air along the Flow lines 35 is entrained in the direction of arrow 32. Since here the air emerging from the roof space 28 If a deflection occurs along the flow lines 29 after passing through the slot 33, this venting is also carried out slightly higher pressure losses than that described in FIG. 10 in the direction of arrow 26.

The further fold on the underside 6a of the cover fold side 6 of a roof covering plate 2 is designated by 34 (see Fig. 11).

With an oblique flow against the roof, for example in the direction of arrow 36 of FIG. 1, one occurs accordingly of component 36a reduced ventilation, which nevertheless due to the relatively large width of the air passage slots 4, 4a, 30a, 33 provides significantly higher ventilation of the roof space 28 compared to the prior art.

Even with a flow perpendicular to the ridge 3 in the direction of arrow 37 of FIG. 1, there is a vent of the roof space 28, because depending on the flow velocity in the vicinity of the inner head rib 14, a flow separation with a corresponding increase in speed with simultaneous decrease in pressure of the outside air and according to the conditions of the Bernoulli flow equation also through the air passage slots 4, 4a, 30a, 33 air is sucked in from the roof space 28. However, this direction of flow is along arrow 37 compared to the other flow directions described above in terms of ventilation not so cheap.

At the same time, there is the inventive feature of the roof covering plate 1 for venting the roof space 28 in that it is optically inconspicuous in the covered state and also the combination of the inventive Roofing sheets 1 with conventional roofing sheets 2 of the same circumferential configuration and Form allowed and due to their one-piece design for ventilation relatively wide air passage slots 4, 4a, 30a, 33 without additional parts. Through the skilful use of an air passage area 4 between the The upper side 5a of the water fold side 5 and the lower side 6a of the cover fold side 6, despite the relatively wide and high Air passage channels prevent rainwater from penetrating through the individual in the form of rain, snow or sleet Folding ribs 38, 39 of the water rebate side 5 prevented.

Reference list

roofing plate according to the invention 1 conventional roofing sheet 2nd Top of the roofing sheet 1 1a Underside of the roof covering plate 1 1b First 3rd Air passage area 4 4th Air vents 4a, 30, 30a, 33 Water fold side 5 Top of the water rebate side 5 5a Area of the water rebate side 5 5b Level of the top of the water fold 5 5c Bearing base 5d Cover fold side 6 Underside of cover fold page 6 6a Ledges 7 Bearing surface 8th Longitudinal axis 9 Stop edges 10th horizontal 11 foot 12th head 13 Top ribs 14, 15 Ribs 16, 17 Drainage openings 18, 19 Noses 20th Stiffening ribs 21, 22 Reinforcing rib pairs 23-25 Arrows 26, 27, 32, 36, 36a, 37 Attic 28 Flow lines 29, 35 Side surface of the fold 31 31a Longitudinal folds of the roof covering plate 2 under the cover fold side 6 34, 40 Longitudinal seams on the water seam side 5 31, 38, 39

Claims (11)

1. A side lap roof tile (1) for the ventilation of a roof room (28) situated below, which in the installed position exhibits an air passage area (4) with the longitudinally adjoining roof tile, wherein the air passage area (4) between the upper side (5a) of the lap weather side (5) of the one roof tile and the lower side (6a) of the covering lap side (6) of the longitudinally adjoining roof tile, characterized in that several interspaced studs as projections (7) are shaped on the lower side (6a) of the covering lap side (6) of the roof tile (1) and that several interspaced support foots (5d) protruding over the level (5c) of the upper side (5a) of the weather lap side (5) are shaped on the upper side (5a) of the weather lap side (5) of the roof tile (1) each of which is demarcated at right angles to the longitudinal axis (9) of the roof tile (1) by two protruding stop edges (10) wherein in the installed position the protrusions (7) of the one roof tile comes to rest on the support foots (5d) of the longitudinally adjoining roof tile, leaving air passage slits (4a, 30a, 33) between the two roof tiles.
2. A side lap roof tile according to claim 1, characterized in that the studs (7) have the shape of the frustum of a pyramid with a quadratic or rectangular shaped foot.
3. A side lap roof tile according to claim 1, characterized in that the areas of support foot (5d) and stop edges (10) are approximately of identical width and arranged under an angle of inclination (a) between 0° and 30° relative to the horizontal (11) in the direction of the foot (12) of the roof tile (1).
4. A side lap roof tile according to one of the claims 1 to 3, characterized in that it is equipped with four studs (7) on the lower side (6a) of its covering lap (6) and on the upper side (5a) of its weather lap side (5) with four support foots (5d) at identical height relative to the longitudinal axis.
5. A side lap roof tile according to one of the claims 1 to 4, characterized in that on its upper side (la) at the level of its head (13) it has an inner and an outer head rib (14, 15) and on the lower side (1b) of its foot (12) it has an inner and an outer foot rib (16, 17) which run in parallel.
6. A side lap roof tile according to claim 5, characterized in that the inner and outer head rib (14, 15) have rounded edge areas or are of a trapezoidal cross-sectional shape.
7. A side lap roof tile according to claim 5, characterized in that the inner and outer foot ribs (16, 17) have either rounded edge areas or are chamfered into a trapezoidal cross-sectional shape.
8. A side lap roof tile according to claims 5 or 6, characterized in that the inner head rib (14) of the weather lap side (5) is equipped with an adjoining water drain opening (18).
9. A side lap roof tile according to one of the claims 1 to 8, characterized in that on its lower side (1b) in the vicinity of its head (13) it is equipped with two projecting lugs (20) and in the adjoining area ending just in front of the foot ribs (16, 17) it is equipped with longitudinal and transverse stiffening ribs (21-25).
10. A side lap roof tile according to claim 9, characterized in that from the inside of two stiffening ribs (21, 22) running in parallel with the longitudinal axis (9) three transversely arranged pairs of stiffening ribs (23-25) branch off towards one another at different levels wherein the one longitudinal stiffening rib (22) is arranged below the weather lap side (5) and the other longitudinal stiffening rib (21) is arranged approximately in the central area of the lower side (1b).
11. A side lap roof tile according to one of the claims 1 to 10, characterized in that the weather lap side (5) at the end facing the foot (12) is also equipped with a water drain opening (19) towards the adjoining roof tile.

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