DE3246573A1 - Covering for buildings and sealing web for its manufacture - Google Patents

Abstract

A ventilated, watertight covering for buildings or building parts, in particular for flat roofs, is described, consisting of at least one layer of plastics webs which are joined to one another watertightly and composed of weather-resistant, optionally foamed, elastomer and which are shaped, at at least one edge, into a dimensionally stable, highly resilient angle profile serving as a surround and furthermore joined firmly but resiliently to one another to form a continuously closed roof skin, the covering being kept at a distance from the building surface leaving open a vent. The invention also relates to a sealing web for manufacturing such a covering, which consists of optionally foamed, weather-resistant elastomer and is shaped, at at least one edge, into a dimensionally stable, highly resilient angle profile serving as a surround. The sealing problems occurring particularly frequently in the attic region and in the region of the dome lights of flat roofs are solved in a surprisingly simple, quick and clean manner with the aid of the proposed covering and the sealing web according to the invention.

Description

Cover for buildings and waterproofing membrane for their manufacture

The invention relates to a ventilated, waterproof cover for structures or parts of structures, in particular for flat roofs, which consist of at least a layer of plastic sheets connected to one another in a watertight manner, as well as a sealing membrane for producing such a cover.

For covering and sealing flat roofs, balconies and terraces Countless suggestions have already been made without a solution yet found would not have been completely renewed or "refurbished" every 5 or 10 years requires. A good overview of those related to the waterproofing of flat roofs Problems are Dr. Anton W. Rick in "Das Flach Dach", 6th edition, 1969, road construction, Chemie und Technik Verlagsgesellschaft mbH, Heidelberg.

A double-shell, rear-ventilated flat roof usually has the following Layer sequence on: raw ceiling (concrete, steel or wood construction) - leveling layer made of concrete or mortar (for leveling out unevenness in the raw ceiling and for creating a slight slope) - vapor barrier - thermal insulation layer - second shell with roof ventilation - roof membrane <sealing layer) - track position - covering layer (e.g.

Gravel) - wear layer (e.g. paving). Ventilated, waterproof Covers for balconies and terraces basically have the same layer structure. All of these different layers are subject to constant attack from two sides: The constantly changing heat exposure from outside and the water vapor diffusion from Inside. The effect of heat from the outside in the different materials the different layers have different degrees of thermal expansion, causing it especially at the layer boundaries to movement and thus to the formation of cracks.

Surface water first penetrates the cover through the cracks, then into the massive parts of the structure itself, causing further secondary damage leads. On the other hand, water vapor penetrates from inside the structure Diffusion into the cover, condenses on colder surfaces and leads through it to putrefaction and rotting, evaporates under strong sunlight and leads This leads to the formation of bubbles in the roof membrane and ultimately to the complete destruction of the Layer structure.

The actual sealing layer or roof skin is initially sheet-like, bituminous materials are used, especially roofing felts, which are laid in several layers and under each other glued with bitumen, tar or special adhesives and with the same adhesives were coated. To increase tear resistance and resistance to temperature changes it has been suggested to use wire bracing or strength-increasing between the cardboard layers Insert a carrier, for example glass fabric or glass fleece. Finally one has proposed unshaped bituminous covering media, such as mastic asphalt, for Manufacture of waterproof roof skin to use. In the end weldable foils and plates made of thermoplastics were made with and proposed without strength-increasing support inserts, especially foils made of soft PVC and polyisobutylene. In the meantime, the thermoplastic ones could also become Plastics do not prevail for the production of the sealing layers because they are in the course become brittle over time due to plasticizer losses, because they are not sufficiently UV-resistant and because they are in the area of the welds due to occurring during welding Structural changes changed mechanical, chemical and physical properties have, causing it to become at the border areas between weld seams and foil Stress and cracking occurs.

Finally there was already the use of liquid, pourable or trowelable coatings made of crosslinkable and curable, but also after the cross-linking of permanently elastic elastomers to produce the waterproof ones Cover proposed, in particular the use of synthetic rubber. Even though these elastomers compared to the previously used thermoplastics and in particular the weldable plastic films have significant advantages in terms of of elasticity and thermal shock resistance, the simple led Material replacement in the manufacture of the roof cladding has not yet turned out to be an overall satisfactory one Cover, i.e. a cover that is not only completely waterproof in the long term remains, but at the same time is as simple as possible to manufacture and lay that Has the necessary strength in order to be able to apply a special wear layer To be able to forego the proper ventilation and discharge of the through the building ceiling ensures that the vapor diffuses through it in an emergency can take off from the top of the building without being completely destroyed and the dreaded crack formation in the roof membrane or at the interfaces between the individual layers as far as possible.

The invention is based on the object of a cover of the initially to create the named genus, which, while avoiding the usual, The disadvantages associated with weldable plastic films are a long-term, absolutely watertight, Permanently elastic, tear, impact, pressure and wear-resistant, shrinkage-free roof skin forms, which is as simple as possible to manufacture and relocate, which can also be used by laypeople can be easily repaired and which is a holistic solution not only for the flat or flat areas of flat roofs, but also especially for those areas offers problematic areas of flat roofs and similar structural parts, namely for the area of the roof end (parapet), the area of skylights, skylights and the like and the area of pipe penetrations (downpipes, drains, etc.). The invention is also based on the object of producing a suitable sealing membrane to create such a cover.

According to the invention, this object is achieved with one of at least one Layer of existing cover made of plastic sheets connected to one another in a watertight manner of the type mentioned at the outset in that the plastic sheets are made of weather-resistant, optionally foamed elastomer exist, on at least one edge to one dimensionally stable, highly elastic, angled profile serving as a border and along the butt joints between each two sheets to form one continuously closed roof skin are elastically connected, as well as the fact that the cover by suitable means at a distance that allows ventilation from the surface of the building or from a possibly provided second shell is held.

Since in the cover according to the invention, the edge termination is an integral Part of the actual roof skin is because it is made of weather-resistant elastomer existing plastic sheets in the area of the edge termination to one Angle profile are formed, omitted in the solution according to the invention, all connection and Sealing problems between the edge or, in the case of flat roofs, the roof on the one hand and roof skin on the other. To solve these problems were previously complex Special constructions are required in order to avoid the Problems caused by mechanical stress, heat and steam build-up to be solved at least for a reasonable period of time. Sooner or later had to but all of these elaborate constructions because of the attacks in this area Forces leaking and therefore "in need of renovation".

According to the invention, “weather-resistant elastomer” means optionally modified and / or vulcanized natural or synthetic rubber, a silicone elastomer or silicone rubber, a thermoplastic modified in a known manner, for example modified polyethylene, polypropylene or polybutylene, as well as any other in appropriately modified synthetic resin, such as polyurethane elastomer understood.

These elastomers are particularly resistant to temperature changes, weatherproof, UV-resistant, highly elastic, tear-resistant, impact-resistant, pressure-resistant, wear-resistant, root-resistant, rot-resistant, rot-resistant, non-shrinking, non-embrittling, durable against acid rain and all other chemicals found in the atmosphere, resistant to bitumen, oil, petrol, diluted acids, bases, sea water, industrial exhaust gases, Resistant to flying sparks, easily repairable, and they can be used in terms of modify their curing characteristics in almost any way, i.e. e.g. adapt to the temperatures prevailing at the time of installation. According to the invention The elastomers used can be pigmented as desired, but they can also be colorless and thus processed and used in a translucent manner.

The anyway heat-insulating properties of the invention consistently closed roof cladding can, if necessary, be significantly improved in that Plastic sheets made of foamed elastomer are used.

Another advantage of the cover according to the invention is that no strength-enhancing supports, e.g.

Wire, woven, knitted or fleece inserts are required to to the roof membrane composed of the plastic sheets the necessary strength to lend; rather, the elasticity and strength values are so high that the Cover according to the invention can also be walked on, habitable without strength-increasing beams, can be planted and even driven over. Although not necessary, it is of course possible, the cover according to the invention also using such additional strength-increasing carrier, which is in the elastomer plastic sheeting can be integrated to train.

The cover according to the invention is using more suitable than Spacers of acting means basically so on the structure or part of the structure attached that between the building surface and the underside of the cover an air space remains free, the component of a continuous rear ventilation of the whole Coverage is.

Means suitable as spacers are conventional lath constructions, Welded wire mesh, plastic or metal grids and the like are suitable. Particularly preferred means of keeping the cover a vent-free distance To keep them off the surface of the building are individual piles of hardenable adhesive and preferably made of an elastomer of the same type that the plastic sheets are made of exist. In the not yet hardened state, these piles initially cause a Bonding between the roof skin composed of the individual plastic sheets and the building surface or the optionally provided second shell and after hardening are both firm but elastic at the same time Spacers represent.

Instead of individual piles of elastomer compound, you can put it on the underside the roof skin and thus every single plastic sheet of rubber chips, e.g. from old tires, be glued on. The rubber chips in turn provide suitable spacers Maintenance of the rear ventilation.

For the purposes of the invention, particularly preferred elastomers are the polyurethane elastomers, which are characterized by suitable selection of functionalities modify the polyol on the one hand and the isocyanate on the other hand very easily permit. Leave depending on the ratio between reactive OH and NCO groups essentially linear polyurethane chains or branched and three-dimensional ones Cross-linking to form cured polymer chains. Depending on the controllable number of after The polyurethane elastomers can use functional groups that are still free of crosslinking then with the help of special additives - according to the vulcanization of the natural or synthetic rubber - through bridging between the individual polymer chains further modified.

The use of polyurethane elastomers leads to resistance to temperature changes the coverage according to the invention from -500c to + 1000C in long-term behavior, short-term even from -500C to + 2500C. The polyurethane coating has an elongation at break Up to 400% extremely tear-resistant, but at the same time permanently elastic, impact-resistant, wear-resistant and not embrittling due to the lack of a plasticizer content. The adhesive strength on sandblasted steel 2 is 280 kg / cm2. On concrete, the adhesive strength exceeds of the polyurethane elastomer even the tensile strength of the concrete. Even without a special one The polyurethane elastomer is an additive to flame-retardant or flame-retardant substances particularly resistant to flying sparks and radiant heat (DIN 4102, part 7).

The cover according to the invention can have a single-shell or two-shell design be. In the single-shell design, the cover is made with the help of the described, means suitable as spacers attached directly to the building surface, while in the two-shell training one created in a manner known per se second shell is provided, which optionally over a thermal insulation layer and / or a vapor barrier can be arranged. The second shell can be known per se Way made of wood, metal, plastic, concrete, mortar and the like.

Another advantage of the cover according to the invention is its extraordinary quality high flexibility, especially in the attic area, in the area of skylights and similar structures as well as in the area of drain and pipe connections to carry comes because in these areas there is often no flat surface available as a substrate stand, but curved surfaces, angles, edges, elevations and depressions, Grooves, channels, openings and the like.

The cover according to the invention can easily cover all of these irregularities and unevenness of the subsurface can be applied without the danger cracking, shrinking or becoming brittle.

Strong alternating bending stress also leads to the inventive Cover does not cause stress whitening.

The cover according to the invention is itself a vapor barrier. Additional, conventional vapor barriers can be built in, but they are not mandatory. Because the elastomer from which the roof cladding is made is itself is waterproof and rot-proof, even condensation cannot harm it. In addition, the ventilation of the cover ensures that the previous designs Dreaded blistering in the roof cladding due to heat build-up, steam and condensation build-up is excluded.

In a preferred embodiment of the invention, the elastomer is in particular the plastic sheeting made of it, biocidal and / or flame-retardant equipped.

The free surface of the cover, which doubles as a usable area Can be used, depending on your needs, by incorporation of pigments, mineral Particles, tinsel made of plastic or other common decoration particles to the respective Purpose of use can be optimally adapted. The surface can also be special light- and heat-reflecting protective layers, in particular with a protective layer or a protective varnish against the effects of UV radiation. Even though Completely superfluous for the function of the cover, additional gravel can also be used or paving slabs are applied.

In a further advantageous embodiment of the invention the plastic sheets are at least above light openings in the structure Areas unpigmented, colorless and translucent. This makes them special costly and rarely 100% leakproof edge connections on skylights and skylights superfluous. In the cover according to the invention is simply in this area of the roof skin is an unpigmented, colorless and translucent one Used sealing membrane. However, it is also sufficient if only that part of the roof membrane is directly above the light openings, is made translucent and if the translucent area with the adjacent pigmented opaque Areas of the roof membrane is firmly but elastically connected. Preferably the translucent area chosen somewhat larger than the outline or the base the skylight or the skylight, so that the butt joints between the translucent area and the opaque area outside the critical Light opening. Then you can even deliberately destroy the cover the damage caused by penetrating water as little as possible held will.

In a further embodiment of the invention, the plastic sheets are in the area of their butt joints forming edges tapers in the shape of a step, so that Adjacent tracks by pouring the butt joints and the stair-step-shaped Training resulting grooves with a suitable potting compound particularly tight and can be firmly connected elastically to each other.

An elastomer of the same type is preferably used as the casting compound from which the plastic sheets are made.

When the edges of the plastic sheets are tapered in the shape of a staircase are, the elastic potting of the then between two adjacent plastic sheets formed T-shaped joints also consist of two different layers of elastomer: If, for example, the cover is laid in very cold weather, the joint can initially be cast with an elastomer that is still elastic even at low temperatures remains, but does not harden or does not harden completely at these low temperatures; A relatively thin layer of a can then over this first elastomer second elastomer are applied, which does not have the desired elasticity values needs to have, but hardens easily and completely even at low temperatures. Under the protection of this thin, second elastomer layer, the one underneath The main layer gradually cures completely, taking the at low temperatures slow networking speed is no longer a problem.

In those embodiments of the invention in which the edges of the plastic sheets are not tapered in the shape of a staircase, they are then between every two adjacent plastic sheets butt joints are created with a corresponding one elastomer potting compound poured, where you get so much potting compound that used not only the joint itself, but also the right and left side the surface areas of the adjacent plastic sheets still located at the joint are covered with the potting compound so that the connection and adhesive surface is increased and thus also the adhesive strength and the elongation at break of the cover in the area of the Joints between the plastic sheets is increased.

In a particularly preferred embodiment of the invention have the angle profiles serving as edge termination in the area of both angle legs, each on the side facing the building, several ventilation ducts forming Grooves with openings that remain free, through which air and water vapor enter the and can circulate freely from the rear ventilation. This creates complex devices superfluous, the air passage from the conventional roof structures Ventilation through the attic area and through the roof end, and of course also in reverse, you should make sure. In the solution according to the invention are the ventilation ducts required for this in the one serving as the edge closure Angled profile of the plastic sheets and thus integrated into the roof skin itself. the The geometry of the grooves forming the ventilation ducts is not essential here; it can be grooves with rectangular, with triangular and any other polygonal Cross-section, but also through holes.

In the last exemplary embodiment explained, this can be done as Angled profile serving as a border also at a distance from the building surface, for example from the attic, as well as the other areas the cover, but this is not the case with the solution preferred according to the invention more imperative, because even if they are used as a border Angle profiles rest directly on the building surface without any air gap, one the free access to air permitting connection between the Outside atmosphere and the rear ventilation, precisely through the grooves forming the ventilation ducts, is ensured.

Another, particularly preferred embodiment of the invention is that over the described, continuously closed roof skin a second, otherwise identical roof skin is arranged. In this embodiment is therefore located above a first layer of waterproof interconnected Plastic sheets a second layer of the same and in the same way with each other connected plastic sheets, in such a way that a rear ventilation between the two layers it remains free that the angle profiles are firmly but elastically connected to one another are that the ventilation ducts forming grooves and their openings remain free.

With this 1, double "embodiment of the cover according to the invention skylights, passages and other building openings can be made particularly easy and safe seal and cover. In this case, the lower roof cladding can be seen directly at the edge of the skylight or other obstacle, such as a downpipe or a power supply mast, elastic and watertight fasten, for example through Gluing, welding, casting, foaming or any other known technique, and you can simply put the second, upper roof skin over the skylight, the opening, put the passage or other obstacle so that the dome or the other opening is completely sealed. Here again the directly The area of the second roof skin located above the light opening is colorless and translucent be executed. Since the second, upper roof skin on its underside has a Suitable means act as spacers in a vent that leaves behind Distance from the surface of the first, lower roof membrane is kept, air can and water vapor can also circulate freely between the two roof skins.

The vertical leg of the angle profile that forms the edge, preferably has a drip nose to prevent rainwater and condensation from dripping off to facilitate.

The layer thickness or strength of the plastic webs that make up the inventive Cover is built up, can within wide limits, depending on the application, vary; it is preferably 1 to 10 mm, in the area of the edge termination serving angle profiles preferably 5 to 25 mm.

The object underlying the invention is further through a Sealing membrane for the production of the cover according to the invention solved, which optionally foamed, weather-resistant elastomer and at least one edge to a dimensionally stable, highly elastic angle profile that serves as a border is shaped and which is preferably made of optionally modified and / or vulcanized Natural or synthetic rubber, polyurethane or silicone elastomer is made, however also made of thermoplastics modified in a known manner, for example polyethylene, Polypropylene or polybutylene, as well as others, modified in a suitable manner Can consist of synthetic resins.

In a preferred embodiment, the sealing membrane is whole or partially unpigmented and translucent. The sealing membrane can also be advantageous Be biocidal and / or flame-retardant, they can be in the area of their butt joint-forming Edges are tapered in a stepped manner and they can, particularly preferably, within their angle profile serving as a border in the area of both angle legs, each on one side, several, ventilation ducts forming grooves of any cross-section or have through holes with openings that remain free. With another Embodiment of the invention Sealing membrane has the vertical Legs of the angle profile have a drip nose.

The layer thickness or strength of the sealing membrane can, depending on the area of application; fluctuate within wide limits; it is preferably 1 to 10 mm and im Area of the angle profile preferably 5 to 25 mm.

The invention is further explained with reference to the drawing: FIG. 1 is a section through part of a two-layer flat roof covering according to the invention; FIGS. 2 and 3 are sections through the roof skins of further exemplary embodiments the cover according to the invention with different butt joint designs; Fig. 4 is a further section through the cover according to FIG. 1 in the area of a light dome and Fig. 5 is a section through another embodiment of one according to the invention Cover in the area of a skylight.

In the two-layer embodiment of the cover according to the invention 1 (Fig. 1) is the cover of a double-shell flat roof 2, wherein only the particularly critical edge area around the parapet 3 and the area above the adjacent part of the concrete ceiling 4 is drawn. On top of the concrete ceiling 4 is a thick insulating layer 5 made of glass or mineral wool, over the one with the top edge of the parapet 3 concluding conventional slat construction as the second Shell 6 is attached. The cover lies on the parapet 3 and the second shell 6 1 for reasons detailed below be purified so that a rear ventilation 13 remains free, which via ventilation ducts with the outside atmosphere is in open communication.

The cover 1 consists of a first, lower layer of each other waterproof connected plastic sheets 8 made of weather-resistant polyurethane elastomer, the plastic webs 8 not having a strength-increasing fabric or the like contain. The plastic webs 8 are at one edge to form a dimensionally stable, highly elastic, angled profile 9 serving as an edge termination. Winkelp2 (ofil 9 and plastic sheet 8 thus consist of one piece, without the parapet 3 being transverse to the cutting plane any connection seams or joints between the angle profile 9 and plastic sheet 8 would be present. The plastic webs 8 are along the between each two webs resulting butt joints, which, among other things, lie in planes parallel to the cutting plane, in Area of the roof center but also lie in planes perpendicular to the cutting plane, with one another elastically connected to form a completely closed roof skin. The bottom the plastic webs 8 is made with rubber chips 7 of different sizes stickers so that air and water vapor between the individual rubber chips unhindered can flow through and that at the same time the plastic sheets 8 in one the rear ventilation 13 kept free distance from the building surface or the second shell 6 will.

The angle profile 9 has in the area of both angle legs, respectively on the side facing the building 2, several grooves forming ventilation ducts 10 with remaining openings 11, 12, through the air and water vapor into the and can circulate freely from the rear ventilation 13.

Above the first, lower layer of waterproof interconnected Plastic sheets 8 are a second layer of the same and in the same way interconnected plastic webs 15, with between the two layers one Rear ventilation 20 remains free and wherein the angle profiles 16 of the plastic sheets 15 with the angle profiles 9 of the plastic webs 8 firmly but elastically with one another are glued. The ventilation ducts which are also located in the angle profiles 16 and form Grooves 17 and their openings 18, 19 remain free, so that air and Water vapor can also freely circulate into and out of the intermediate rear ventilation 20. The distance between the Plastic webs 15 of the second layer from the top of the plastic webs 8 of the first position is maintained again by suitable means, namely by the in irregular distribution on the underside of the plastic webs 15 glued Rubber chips 7.

The vertical leg of the angle profile 16 has a drip nose 21 trained extension.

In Fig. 2 and Fig. 3, two embodiments for the elastic, Tear and tensile strength connection along the resulting between two plastic sheets Butt joints reproduced. The butt joints are on the underside of the two adjacent plastic webs 22, 23; 26, 27 with a simple tape 24, 28 been temporarily covered so that the casting compound 25, 29 before it hardens do not leak out of the butt joints and penetrate into the underlying roof structure can. The plastic sheets 22, 23 are in the area of their delimiting the butt joint Edges not specially designed.

The potting compound 25 consists of the same elastomer as the plastic sheets 22, 23, namely a modified polyurethane elastomer. The potting compound 25 is applied in such an amount that they also cover the surfaces of the butt joint adjacent areas of the plastic webs 22, 23 covered so far that a T-shaped Potting compound profile results in a high adhesive strength between the plastic sheets 22, 23 and the potting compound 25 guaranteed.

In the embodiment shown in Fig. 3, the plastic sheets 26, 27 tapered in the form of a stepped step in the area of their butt joint-forming edges, so that a T-shaped groove or butt joint remains free between the tracks, which with two different elastomers 29, 30 is poured out, which differ in terms of their Differentiate curing speeds. This embodiment is also through the largest possible connection between the potting compound 29 and the plastic sheets 26, 27 ensures that the bond also has a high degree of adhesion and adhesion in the area of the butt joint Has tensile strengths.

In Fig. 4 the cover according to Fig. 1 (in a somewhat simplified, schematized form) in another area of the flat roof 2, namely in the area of the dome light 31, which has a corresponding light opening in the concrete ceiling 4 covered. The first layer is the cover 1, that is, that of the plastic webs 8 lower layer assembled to form a continuously closed roof membrane, direct to the enclosure of the Liohtkuppel 31 watertight, firmly but elastically attached. The second, upper layer made of waterproof, interconnected plastic sheets 15 has a special area 32 above the light dome 31 which is unpigmented and is translucent and the all around with the help of potting compound 25 in the in Fig. 2 shown with the plastic webs 15 to a continuously closed Roof skin is elastically connected. The translucent area 32 is like this chosen large that the butt joints and thus the connection to the plastic sheets 15 lies outside the critical area of the skylight dome.

With a simpler skylight construction (Fig. 5) there is a simple one Roof skin made of plastic sheets 8 connected to one another in a watertight manner over a flat, the light opening in the concrete ceiling 4 covering glass or acrylic glass plate 34, the plastic sheet 8 lying directly above the plate 34, the component one through walking closed dacli skin is, on the whole, unpiqflnt lert and translucent. The glass plate 34 rests on squared timbers 33 that the space filled with an insulating layer 5 between the rear ventilation 35 and the concrete ceiling 4 laterally close in the area of the light opening.

The cover according to the invention can not only be used to cover flat roofs, but also used by other civil engineering works of all kinds, too of terraces and balconies, of underground garages and parking decks, but can also be used for sealing of floors in wet rooms as well as in sanitary and industrial areas. The cover according to the invention can, should it be damaged, even by non-specialists by potting the damaged area with elastomer solution or -paste easy and quick to repair. The sealing membranes according to the invention and thus are also the entire cover, even if they are made of non-foamed elastomer, compared to conventional covers, especially if the latter is graveled must, significantly lighter, which is extremely cost-reducing on the statics of the to be covered Building has an effect, which has to carry a significantly lower load as a result.

Claims (17)

Claims Ventilated, waterproof cover for buildings or structural parts, in particular for flat roofs, consisting of at least one Layer of plastic sheets connected to one another in a watertight manner, characterized in that that the plastic sheets (8.15; 22.23; 26.27) made of weather-resistant, optionally foamed elastomer, at least one edge to form a dimensionally stable, highly elastic angle profile (9, 16) serving as an edge and along of the butt joints between every two sheets to one continuous closed roof skin are elastically connected, and in that the cover (1) by suitable means (7) in a rear ventilation (13, 20, 35) leaving free Distance from the building surface or a second, if applicable Shell (6) is held. 2. Cover according to claim 1, characterized in that the plastic sheets made of possibly modified and / or vulcanized natural or synthetic rubber, Polyurethane or silicone elastomer are made. 3. Cover according to claim 1 or 2, characterized in that the Plastic sheeting at least in areas above light openings in the structure (32) are unpigmented and translucent. 4. Cover according to one of claims 1 to 3, characterized in that that the plastic sheets made of biocidal and / or flame-retardant elastomer exist. 5. Cover according to one of claims 1 to 4, characterized in that that the plastic webs (26,27) in the area of their butt joints forming edges step-like are rejuvenated. 6. Cover according to one of claims 1 to 5, characterized in that that the butt joints between the plastic sheets with preferably the same elastomer (25) are poured or glued, from which the plastic webs (8,15; 22,23; 26,27) exist themselves. 7. Cover according to one of claims 1 to 6, characterized in that that the angle profile (9, 16) serving as the edge closure in the area of bei.der angle legs, each on the side facing the structure (2), several ventilation ducts forming Grooves (10, 17) with openings (11, 12; 18, 19) that remain free, through the air and water vapor can freely circulate in and out of the rear ventilation (13,20,35). 8. Cover according to one of claims 1 to 7, characterized in that that over a first layer of waterproof interconnected plastic sheets (8) a second layer of the same and interconnected in the same way Plastic sheeting (15) is arranged so that there is ventilation between the two layers (20) it remains free that the angle profiles (9, 16) are firmly but elastically connected to one another are that the ventilation ducts forming grooves (17) and their openings (18,19) remain free. 9. Cover according to one of claims 1 to 8, characterized. characterized in that the vertical leg of the angle profile (9,16) has a drip nose (21). 10. Sealing sheet for producing the seal according to one of the claims 1 to 9, characterized in that it is made of optionally foamed, weather-resistant Consists of elastomer and at least one edge to form a dimensionally stable, highly elastic, serving as an edge angle profile (9,16) is formed. 11. Sealing sheet according to claim 10, characterized in that it consists of optionally modified and / or vulcanized natural or synthetic rubber, Polyurethane or silicone elastomer. 12. Sealing sheet according to claim 10 or 11, characterized in that it is at least partially unpigmented and translucent. 13. Sealing membrane according to one of claims 10 to 12, characterized in that that it consists of biocidal and / or flame-retardant elastomer. 14. Sealing membrane according to one of claims 10 to 13, characterized in that that it tapers step-like in the area of its butt joints forming edges is. 15. Sealing membrane according to one of claims 10 to 14, characterized in that that the angle profile (9, 16) serving as the edge termination in the area of both angle legs a plurality of grooves (10, 17) forming ventilation ducts with openings (11, 12) that remain free; 18,19). 16. Sealing sheet according to one of claims 10 to 15, characterized in that that the vertical leg of the angle profile (9, 16) has a drip nose (21). 17. Sealing membrane according to one of claims 10 to 16, characterized in that that they are 1 to 10 mm in the area of the angle profile serving as the edge (9,16) 5 to 25 mm thick.