EP0740027A1 - Roofing underlay - Google Patents
Roofing underlay Download PDFInfo
- Publication number
- EP0740027A1 EP0740027A1 EP96106262A EP96106262A EP0740027A1 EP 0740027 A1 EP0740027 A1 EP 0740027A1 EP 96106262 A EP96106262 A EP 96106262A EP 96106262 A EP96106262 A EP 96106262A EP 0740027 A1 EP0740027 A1 EP 0740027A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roofing membrane
- roofing
- membrane according
- fabric
- pref
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D12/00—Non-structural supports for roofing materials, e.g. battens, boards
- E04D12/002—Sheets of flexible material, e.g. roofing tile underlay
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06N3/045—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with polyolefin or polystyrene (co-)polymers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/121—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyesters, polycarbonates, alkyds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N5/00—Roofing materials comprising a fibrous web coated with bitumen or another polymer, e.g. pitch
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/12—Permeability or impermeability properties
- D06N2209/121—Permeability to gases, adsorption
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/12—Permeability or impermeability properties
- D06N2209/126—Permeability to liquids, absorption
- D06N2209/128—Non-permeable
Definitions
- the invention relates to a roofing membrane with a water vapor permeable but surface waterproof layer.
- the task of a roofing membrane is to protect the roof construction parts lying under a roof covering against the ingress of contaminants such as dust and soot, as well as from moisture, e.g. B. to protect penetrating surface water or driven thawing flying snow.
- a ventilation space is provided between the thermal insulation and the roofing membrane in order to be able to discharge the moisture diffusing from the interior through the thermal insulation to the outside.
- This ventilation space is essential when using conventional roofing membranes made of polyethylene films, since the water vapor diffusion resistance of these films is so high that the moisture cannot diffuse through the roofing membrane quickly enough.
- roofing membranes Due to increased requirements due to building regulations, thicker layers of insulation have to be provided for thermally insulated roof structures, so that there is hardly any space left for the necessary ventilation space. For this reason, roofing membranes have been developed which, in addition to sealing off the thermal insulation from external influences, are so open to water vapor diffusion that a ventilation space between the thermal insulation and the roofing membrane can be omitted.
- Such a roofing membrane is known, for example, from EP-A2 0 169 308.
- a polyurethane film is provided with a fleece layer.
- the polyurethane film is permeable to water vapor, but surface waterproof.
- the fleece layer should absorb excess water vapor and temporarily store it without this excess of water vapor condensing out.
- the fleece not only has the task of temporarily storing excess water vapor, but is also largely responsible for the strength of the underlay. However, the strength of nonwovens is limited, so that often a reinforcement with a net must be provided.
- a further embodiment of a sarking membrane can be found in EP-B1 0 183 266.
- the underlayment is formed by a water vapor permeable but surface waterproof film, a reinforcement layer made of open-cell foam and a mesh with a mesh size of 6 to 20 mm to increase strength.
- the strength of these known roofing underlays is also determined by the reinforcement network. Due to the large mesh size, the known roofing membranes are only superficially resilient, d. i.e. that puncturing these webs by e.g. B. sharp objects is easily possible.
- a disadvantage of these known roofing underlays also lies in the fact that relatively thick fleece layers or foam layers have to be used to achieve the required tensile strengths for the roofing underlay, so that a high use of material is required.
- a further disadvantage is that the use of fleece or foam layers makes such roofing underlays much thicker and heavier than conventional polyethylene films, and thus makes them more difficult to handle when laying on the roof.
- the invention is therefore based on the object to provide a roofing membrane which, on the one hand, is so permeable to water vapor that a ventilation space is unnecessary, and which can be produced with little use of material and has a low strength, high strength, high dimensional stability and high surface resistance and is easy to handle during installation.
- This object is achieved in that a fabric with a high fabric density is used as the carrier material for the water vapor permeable but surface water-tight layer.
- a fabric with a fabric density of greater than or equal to 0.8 is preferably used.
- the fabric consists of ribbons.
- Thermoplastic polymers such as high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), polypropylene (PP) and polyester (PET) serve as the starting material for the tapes. These belong to a group of polymers, the strength of which can be increased by stretching. The orientation of the macromolecules of the polymer takes place in the direction of stretching and thus the strength of this shaped body is increased in this direction by stretching a shaped body, such as a film, ribbon or thread made of a stretchable polymer.
- HDPE high-density polyethylene
- LLDPE linear low-density polyethylene
- PP polypropylene
- PET polyester
- a possible production process for the tapes used according to the invention is the formation of films from the polymers, the longitudinal stretching taking place on the film formed. This is then followed by splitting this film in the longitudinal direction to form the film strips. Alternatively, the longitudinal stretching can also be carried out on the film strips. In both cases, one obtains monoaxially stretched tapes with high strength in the longitudinal direction.
- the tapes have a thickness of 10 to 100 microns, preferably 20 to 40 microns and a width of 0.1 to 6 mm, preferably 1 to 4 mm.
- the film strips produced in this way are formed into fabrics on conventional weaving machines, it being possible to use flat and circular weaving machines.
- the preferred type of weave is plain weave.
- the density or unity of a fabric can be expressed in this context by the distance between two ribbons, in the weft or in the warp.
- a complete fabric closure has a fabric density of 1. This is achieved if there is no space in the fabric between the weft threads or the warp threads, or between the weft ribbons or warp ribbons in the ribbon fabric preferred according to the invention.
- a partial overlap or a partial slight spacing of the ribbons is possible.
- a high tissue density is present if this value is greater than or equal to 0.8.
- such a fabric made of monoaxially stretched tapes despite the high fabric density, has sufficient water vapor diffusibility and is largely uniform over the surface, so that the requirements for water vapor permeability for roofing membranes for roofs without ventilation space are met.
- the fabric alone is not surface waterproof, i.e. H. that water on the surface can penetrate the tissue at, for example, capillary forces or at less dense locations.
- the starting material for this layer can be any highly water vapor permeable polymer.
- Thermoplastic polyester elastomers and polyurethanes are particularly suitable for this.
- the layer is advantageously applied to the fabric by extrusion coating.
- the polyolefins which are preferably used for the fabric are non-polar and have only a low adhesive capacity for polymers of the same type. Bonding agents must therefore be used in conventional coating and lamination techniques. However, the use of adhesion promoters severely affects the ability to diffuse.
- the roofing membrane according to the invention has a high tensile strength, a low basis weight, a high dimensional stability and a high surface load capacity, with a low basis weight and a small thickness.
- the tensile strength of the roofing membrane according to the invention has a value of greater than 300 N / 50 mm in both directions (longitudinal and transverse direction), preferably the tensile strength is in a range from 500 to 700 N / 50 mm (measured according to DIN 53 354).
- the elongation at break is at least 10%, preferably greater than or equal to 20% (measured according to DIN 53 354)
- the weight per unit area is from 80 to 200 g / m 2 , preferably from 110 to 150 g / m 2 (measured according to DIN 53 352)
- the needle pull-out force is from 300 to 600 N, preferably from 400 to 600 N (measured according to DIN 54 301).
- the water vapor permeability is greater than 130 g / m 2 .24h, preferably greater than or equal to 160 g / m 2 .24h (measured according to DIN 53 122).
- the diffusion-equivalent air layer thickness is less than 0.30 m, preferably less than 0.25 m.
- An advantageous embodiment is a roofing membrane that is equipped with flame-retardant additives.
- fire behavior according to class B1 (DIN 4102) can be set.
- the roofing membrane according to the invention is particularly suitable for use between an insulation layer and a roof covering.
- a preferred use is the application on sloping roofs.
- the roofing membrane can be applied directly to the insulation layer.
- the coated surface points towards the roof covering. With proper application and a properly executed roof construction, there is no risk of condensation forming on the surface of the roofing membrane facing the insulation layer.
- a roofing membrane according to the invention has the following properties:
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Dispersion Chemistry (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Die Erfindung betrifft eine Dachunterspannbahn mit einer wasserdampfdurchlässigen, aber oberflächenwasserdichten Schicht.The invention relates to a roofing membrane with a water vapor permeable but surface waterproof layer.
Die Aufgabe einer Dachunterspannbahn ist es, die unter einer Dacheindeckung liegenden Dachkonstruktionsteile vor eindringenden Verunreinigungen, wie Staub und Ruß, sowie vor Nässe, durch z. B. eindringende Oberflächenwässer oder eingetriebenem auftauenden Flugschnee zu schützen.The task of a roofing membrane is to protect the roof construction parts lying under a roof covering against the ingress of contaminants such as dust and soot, as well as from moisture, e.g. B. to protect penetrating surface water or driven thawing flying snow.
Bei einer üblichen wärmegedämmten Dachkonstruktion bestehend aus Balken und Sparren, einer Wärmedämmschicht, einer Unterspannbahn und der Dacheindeckung, ist zwischen der Wärmedämmung und der Unterspannbahn ein Belüftungsraum vorgesehen, um die aus dem Rauminneren durch die Wärmedämmung hindurchdiffundierende Feuchtigkeit nach außen abführen zu können. Dieser Belüftungsraum ist bei Verwendung herkömmlicher Dachunterspannbahnen aus Polyethylenfolien unerläßlich, da der Wasserdampfdiffusionswiderstand dieser Folien so hoch ist, daß die anfallende Feuchtigkeit nicht schnell genug durch die Dachunterspannbahn hindurchdiffundieren kann.In a conventional thermally insulated roof construction consisting of beams and rafters, a thermal insulation layer, a roofing membrane and the roof covering, a ventilation space is provided between the thermal insulation and the roofing membrane in order to be able to discharge the moisture diffusing from the interior through the thermal insulation to the outside. This ventilation space is essential when using conventional roofing membranes made of polyethylene films, since the water vapor diffusion resistance of these films is so high that the moisture cannot diffuse through the roofing membrane quickly enough.
Durch gesteigerte Anforderungen aufgrund von Bauverordnungen müssen für wärmegedämmte Dachkonstruktionen dickere Dämmschichten vorgesehen werden, sodaß kaum mehr Platz für den nötigen Belüftungsraum bleibt. Deshalb wurden Unterspannbahnen entwickelt, die zusätzlich zur Abschottung der Wärmedämmung vor von außen eindringenden Einflüssen, so wasserdampfdiffusionsoffen sind, daß ein Belüftungsraum zwischen der Wärmedämmung und der Dachunterspannbahn entfallen kann.Due to increased requirements due to building regulations, thicker layers of insulation have to be provided for thermally insulated roof structures, so that there is hardly any space left for the necessary ventilation space. For this reason, roofing membranes have been developed which, in addition to sealing off the thermal insulation from external influences, are so open to water vapor diffusion that a ventilation space between the thermal insulation and the roofing membrane can be omitted.
Eine derartige Unterspannbahn ist z.B. aus der EP-A2 0 169 308 bekannt. Bei dieser Konstruktion wird eine Polyurethanfolie mit einer Vliesschicht versehen. Die Polyurethanfolie ist wasserdampfdurchlässig, aber oberflächenwasserdicht. Die Vliesschicht soll überschüssigen Wasserdampf aufnehmen und vorübergehend speichern, ohne daß dieser Wasserdampfüberschuß auskondensiert. Das Vlies hat nicht nur die Aufgabe der Zwischenspeicherung überschüssigen Wasserdampfes, sondern ist maßgeblich für die Festigkeit der Unterspannbahn verantwortlich. Die Festigkeit von Vliesen ist jedoch beschränkt, sodaß oft zusätzlich eine Verstärkung mit einem Netz vorgesehen werden muß.Such a roofing membrane is known, for example, from EP-A2 0 169 308. In this construction, a polyurethane film is provided with a fleece layer. The polyurethane film is permeable to water vapor, but surface waterproof. The fleece layer should absorb excess water vapor and temporarily store it without this excess of water vapor condensing out. The fleece not only has the task of temporarily storing excess water vapor, but is also largely responsible for the strength of the underlay. However, the strength of nonwovens is limited, so that often a reinforcement with a net must be provided.
Eine weitere Ausführung einer Unterspannbahn ist der EP-B1 0 183 266 zu entnehmen. Die Unterspannbahn wird gebildet durch eine wasserdampfdurchlässige, aber oberflächenwasserdichte Folie, einer Verstärkungsschicht aus einem offenporigem Schaumstoff und einem Gittergewebe mit einer Maschenweite von 6 bis 20 mm, zur Erhöhung der Festigkeit.A further embodiment of a sarking membrane can be found in EP-B1 0 183 266. The underlayment is formed by a water vapor permeable but surface waterproof film, a reinforcement layer made of open-cell foam and a mesh with a mesh size of 6 to 20 mm to increase strength.
Die Festigkeit wird bei diesen bekannten Dachunterspannbahnen auch vom Verstärkungsnetz bestimmt. Durch die große Maschenweite sind die bekannten Dachunterspannbahnen nur eingeschränkt oberflächlich belastbar, d. h., daß ein Durchstoßen dieser Bahnen durch z. B. spitze Gegenstände leicht möglich ist.The strength of these known roofing underlays is also determined by the reinforcement network. Due to the large mesh size, the known roofing membranes are only superficially resilient, d. i.e. that puncturing these webs by e.g. B. sharp objects is easily possible.
Ein Nachteil dieser bekannten Dachunterspannbahnen liegt auch darin, daß zur Erzielung der erforderlichen Reißfestigkeiten für die Dachunterspannbahn relativ dicke Vliesschichten oder Schaumstoffschichten verwendet werden müssen, sodaß ein hoher Materialeinsatz erforderlich ist. Ein weiterer Nachteil ist, daß durch die Verwendung von Vlies- oder Schaumstoffschichten derartige Dachunterspannbahnen wesentlich dicker und schwerer als herkömmliche Polyethylenfolien ausfallen und somit eine schlechtere Handhabbarkeit bei den Verlegearbeiten auf dem Dach gegeben ist.A disadvantage of these known roofing underlays also lies in the fact that relatively thick fleece layers or foam layers have to be used to achieve the required tensile strengths for the roofing underlay, so that a high use of material is required. A further disadvantage is that the use of fleece or foam layers makes such roofing underlays much thicker and heavier than conventional polyethylene films, and thus makes them more difficult to handle when laying on the roof.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Dachunterspannbahn zu schaffen, die einerseits so wasserdampfdurchlässig ist, daß sich ein Belüftungsraum erübrigt, und welche mit geringem Materialeinsatz hergestellt werden kann und bei geringem Flächengewicht eine hohe Festigkeit, eine hohe Formstabilität und eine hohe Oberflächenbelastbarkeit aufweist und eine leichte Handhabbarkeit bei der Verlegung besitzt.The invention is therefore based on the object to provide a roofing membrane which, on the one hand, is so permeable to water vapor that a ventilation space is unnecessary, and which can be produced with little use of material and has a low strength, high strength, high dimensional stability and high surface resistance and is easy to handle during installation.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß als Trägermaterial für die wasserdampfdurchlässige, aber oberflächenwasserdichte Schicht ein Gewebe mit einer hohen Gewebedichte eingesetzt wird.This object is achieved in that a fabric with a high fabric density is used as the carrier material for the water vapor permeable but surface water-tight layer.
Vorzugsweise wird ein Gewebe mit einer Gewebedichte von größer oder gleich 0,8 eingesetzt.A fabric with a fabric density of greater than or equal to 0.8 is preferably used.
In einer vorteilhaften Ausführungsform besteht das Gewebe aus Bändchen.In an advantageous embodiment, the fabric consists of ribbons.
Als Ausgangsmaterial für die Bändchen dienen vor allem thermoplastische Polymere, wie High Density Polyethylen (HDPE), Linear Low Density Polyethylen (LLDPE), Polypropylen (PP) und Polyester (PET). Diese gehören zu einer Gruppe von Polymeren, deren Festigkeit durch Verstreckung gesteigert werden kann. Durch die Verstreckung eines Formkörpers, wie Folie, Bändchen oder Faden aus einem verstreckbaren Polymeren, findet eine Orientierung der Makromoleküle des Polymeren in Verstreckungsrichtung statt und somit erhöht sich in dieser Richtung die Festigkeit dieses Formkörpers.Thermoplastic polymers such as high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), polypropylene (PP) and polyester (PET) serve as the starting material for the tapes. These belong to a group of polymers, the strength of which can be increased by stretching. The orientation of the macromolecules of the polymer takes place in the direction of stretching and thus the strength of this shaped body is increased in this direction by stretching a shaped body, such as a film, ribbon or thread made of a stretchable polymer.
Ein mögliches Herstellungsverfahren der erfindungsgemäß eingesetzten Bändchen ist die Bildung von Folien aus den Polymeren, wobei die Längsverstreckung an der gebildeten Folie erfolgt. Daran anschließend erfolgt eine Aufspaltung dieser Folie in Längsrichtung unter Bildung der Folienbändchen. Alternativ kann die Längsverstreckung auch an den Folienbändchen erfolgen. In beiden Fällen erhält man monoaxial verstreckte Bändchen mit hoher Festigkeit in Längsrichtung.A possible production process for the tapes used according to the invention is the formation of films from the polymers, the longitudinal stretching taking place on the film formed. This is then followed by splitting this film in the longitudinal direction to form the film strips. Alternatively, the longitudinal stretching can also be carried out on the film strips. In both cases, one obtains monoaxially stretched tapes with high strength in the longitudinal direction.
Die Bändchen weisen eine Dicke von 10 bis 100 µm, vorzugsweise 20 bis 40 µm und eine Breite von 0,1 bis 6 mm, vorzugsweise 1 bis 4 mm auf.The tapes have a thickness of 10 to 100 microns, preferably 20 to 40 microns and a width of 0.1 to 6 mm, preferably 1 to 4 mm.
Die derart hergestellten Folienbändchen werden auf herkömmlichen Webmaschinen zu Geweben geformt, wobei Flach- und Rundwebmaschinen eingesetzt werden können. Die bevorzugte Bindungart ist die Leinwandbindung. Die Dichte bzw. Geschlossenheit eines Gewebes kann in diesem Zusammenhang durch den Abstand zweier Bändchen, im Schuß oder in der Kette ausgedrückt werden. Analog zu Geweben aus textilen Fäden oder Garnen hat ein vollständiger Gewebeschluß die Gewebedichte von 1. Dies ist dann erreicht, wenn im Gewebe kein Zwischenraum zwischen den Schußfäden oder den Kettfäden, bzw. im erfindungsgemäß bevorzugten eingesetzten Bändchengewebe zwischen Schußbändchen oder Kettbändchen ist. In einem Bändchengewebe ist jedoch eine teilweise Überlappung oder ein teilweiser geringfügiger Abstand der Bändchen möglich. Eine hohe Gewebedichte liegt erfindungsgemäß vor wenn dieser Wert größer oder gleich 0,8 ist.The film strips produced in this way are formed into fabrics on conventional weaving machines, it being possible to use flat and circular weaving machines. The preferred type of weave is plain weave. The density or unity of a fabric can be expressed in this context by the distance between two ribbons, in the weft or in the warp. Analogous to fabrics made of textile threads or yarns, a complete fabric closure has a fabric density of 1. This is achieved if there is no space in the fabric between the weft threads or the warp threads, or between the weft ribbons or warp ribbons in the ribbon fabric preferred according to the invention. In a ribbon fabric, however, a partial overlap or a partial slight spacing of the ribbons is possible. According to the invention, a high tissue density is present if this value is greater than or equal to 0.8.
Überraschenderweise weist ein derartiges Gewebe aus monoaxial verstreckten Bändchen trotz der hohen Gewebedichte eine ausreichende und eine über die Oberfläche überwiegend gleichförmige Wasserdampfdiffusionsfähigkeit auf, sodaß die Anforderungen an die Wasserdampfdurchlässigkeit für Dachunterspannbahnen für Dächer ohne Belüftungsraum erfüllt werden. Das Gewebe alleine ist jedoch nicht oberflächenwasserdicht, d. h. daß an der Oberfläche befindliches Wasser an Gewebekanten durch beispielsweise Kapillarkräfte oder an weniger dichten Stellen das Gewebe durchdringen kann.Surprisingly, such a fabric made of monoaxially stretched tapes, despite the high fabric density, has sufficient water vapor diffusibility and is largely uniform over the surface, so that the requirements for water vapor permeability for roofing membranes for roofs without ventilation space are met. However, the fabric alone is not surface waterproof, i.e. H. that water on the surface can penetrate the tissue at, for example, capillary forces or at less dense locations.
Daher ist die Aufbringung einer wasserdampfdurchlässigen, aber oberflächenwasserdichten Schicht erforderlich.It is therefore necessary to apply a layer which is permeable to water vapor but is waterproof to the surface.
Das Ausgangsmaterial für diese Schicht kann jedes stark wasserdampfdurchlässige Polymer sein. Besonders eignen sich dafür thermoplastische Polyesterelastomere und Polyurethane.The starting material for this layer can be any highly water vapor permeable polymer. Thermoplastic polyester elastomers and polyurethanes are particularly suitable for this.
Die Aufbringung der Schicht auf das Gewebe erfolgt vorteilhafterweise durch Extrusionsbeschichtung.The layer is advantageously applied to the fabric by extrusion coating.
Die für das Gewebe vorzugsweise verwendeten Polyolefine sind unpolar und weisen nur eine geringe Adhäsionsfähigkeit für nicht artgleiche Polymere auf. In herkömmlichen Beschichtungs- und Kaschiertechniken müssen daher Haftvermittler eingesetzt werden. Der Einsatz von Haftvermittlern beeinträchtigt jedoch stark die Diffusionsfähigkeit.The polyolefins which are preferably used for the fabric are non-polar and have only a low adhesive capacity for polymers of the same type. Bonding agents must therefore be used in conventional coating and lamination techniques. However, the use of adhesion promoters severely affects the ability to diffuse.
Überraschenderweise hat sich gezeigt, daß eine ausreichende Haftung der Schicht mittels der Extrusionsbeschichtung von Polyesterelastomeren und Polyurethanen auf Geweben aus Polyolefinen ohne die Verwendung von Haftvermittlerschichten erzielt werden kann.Surprisingly, it has been found that sufficient adhesion of the layer can be achieved by means of the extrusion coating of polyester elastomers and polyurethanes on polyolefin fabrics without the use of adhesion promoter layers.
Die erfindungsgemäße Dachunterspannbahn weist eine hohe Reißfestigkeit, ein geringes Flächengewicht, eine hohe Formstabilität und eine hohe Oberflächenbelastbarkeit, bei einem geringen Flächengewicht und einer geringen Dicke auf.The roofing membrane according to the invention has a high tensile strength, a low basis weight, a high dimensional stability and a high surface load capacity, with a low basis weight and a small thickness.
Die Reißkraft der erfindungsgemäßen Dachunterspannbahn hat in beiden Richtungen (Längs- und Querrichtung) einen Wert von größer als 300 N/50 mm, vorzugsweise liegt die Reißkraft in einem Bereich von 500 bis 700 N/50 mm (gemessen nach DIN 53 354).The tensile strength of the roofing membrane according to the invention has a value of greater than 300 N / 50 mm in both directions (longitudinal and transverse direction), preferably the tensile strength is in a range from 500 to 700 N / 50 mm (measured according to DIN 53 354).
Die Reißdehnung beträgt mindestens 10 %, vorzugsweise größer oder gleich 20 % (gemessen nach DIN 53 354)The elongation at break is at least 10%, preferably greater than or equal to 20% (measured according to DIN 53 354)
Das Flächengewicht beträgt von 80 bis 200 g/m2, vorzugsweise von 110 bis 150 g/m2 (gemessen nach DIN 53 352)The weight per unit area is from 80 to 200 g / m 2 , preferably from 110 to 150 g / m 2 (measured according to DIN 53 352)
Die Nadelausreißkraft beträgt von 300 bis 600 N, vorzugsweise von 400 bis 600 N (gemessen nach DIN 54 301).The needle pull-out force is from 300 to 600 N, preferably from 400 to 600 N (measured according to DIN 54 301).
Die Wasserdampfdurchlässigkeit ist größer als 130 g/m2.24h, vorzugsweise größer gleich 160 g/m2.24h (gemessen nach DIN 53 122). Die diffusionsäquivalente Luftschichtdicke ist kleiner als 0,30 m, vorzugsweise kleiner als 0,25 m.The water vapor permeability is greater than 130 g / m 2 .24h, preferably greater than or equal to 160 g / m 2 .24h (measured according to DIN 53 122). The diffusion-equivalent air layer thickness is less than 0.30 m, preferably less than 0.25 m.
Eine vorteilhafte Ausführungsform ist eine Dachunterspannbahn, die mit flammhemmenden Zusatzstoffen ausgestattet ist. So kann beispielsweise ein Brandverhalten nach Klasse B1 (DIN 4102) eingestellt werden.An advantageous embodiment is a roofing membrane that is equipped with flame-retardant additives. For example, fire behavior according to class B1 (DIN 4102) can be set.
Besonders geeignet ist die erfindungsgemäße Dachunterspannbahn zur Verwendung zwischen einer Dämmschicht und einer Dacheindeckung. Eine vorzugsweise Verwendung ist die Aufbringung auf geneigten Dächern. Die Dachunterspannbahn kann direkt auf die Dämmschicht aufgebracht werden. Die beschichtete Oberfläche weist dabei in Richtung Dacheindeckung. Bei einer sachgemäßen Aufbringung und einer sachgemäß ausgeführten Dachkonstruktion besteht keine Gefahr einer Tauwasserbildung an der der Dämmschicht zugewandten Oberfläche der Dachunterspannbahn.The roofing membrane according to the invention is particularly suitable for use between an insulation layer and a roof covering. A preferred use is the application on sloping roofs. The roofing membrane can be applied directly to the insulation layer. The coated surface points towards the roof covering. With proper application and a properly executed roof construction, there is no risk of condensation forming on the surface of the roofing membrane facing the insulation layer.
Eine erfindungsgemäße Dachunterspannbahn weist folgende Eigenschaften auf:A roofing membrane according to the invention has the following properties:
- Gewebe:Tissue:
- HDPEHDPE
- Beschichtung:Coating:
- thermoplastisches Polyesterelastomerthermoplastic polyester elastomer
Claims (20)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT73495A AT401941B (en) | 1995-04-27 | 1995-04-27 | ROOF COVERING |
AT734/95 | 1995-04-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0740027A1 true EP0740027A1 (en) | 1996-10-30 |
Family
ID=3498402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96106262A Withdrawn EP0740027A1 (en) | 1995-04-27 | 1996-04-22 | Roofing underlay |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0740027A1 (en) |
AT (1) | AT401941B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016134941A1 (en) * | 2015-02-24 | 2016-09-01 | Dsm Ip Assets B.V. | Roofing membrane and process for producing the roofing membrane |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109928A1 (en) * | 1982-10-18 | 1984-05-30 | Forbo-Stamoid AG | Concealed insulating material |
US4684568A (en) * | 1986-04-21 | 1987-08-04 | E. I. Du Pont De Nemours And Company | Vapor-permeable liquid-impermeable fabric |
EP0341430A1 (en) * | 1988-05-07 | 1989-11-15 | Akzo N.V. | Textile layer laminate with a "breathable" film |
US5169712A (en) * | 1991-08-23 | 1992-12-08 | Amoco Corporation | Porous film composites |
DE4221562A1 (en) * | 1992-07-01 | 1994-01-13 | Metzeler Schaum Gmbh | Thermal insulation for sloping roofs |
DE4322745A1 (en) * | 1993-07-08 | 1995-01-12 | Ploucquet C F Gmbh | Roof-insulating panel |
DE4322747A1 (en) * | 1993-07-08 | 1995-01-12 | Ploucquet C F Gmbh | Waterproof membrane for roofs |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1530498A (en) * | 1967-05-03 | 1968-06-28 | Articles woven from stretched plastic strips | |
BG15378A3 (en) * | 1967-06-08 | 1972-05-20 | Chemiefaser Lenzing Ag | METHOD FOR DRIVING FABRIC FROM FOIL STRIPS AND DEVICE FOR DRIVING THE METHOD |
-
1995
- 1995-04-27 AT AT73495A patent/AT401941B/en not_active IP Right Cessation
-
1996
- 1996-04-22 EP EP96106262A patent/EP0740027A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109928A1 (en) * | 1982-10-18 | 1984-05-30 | Forbo-Stamoid AG | Concealed insulating material |
US4684568A (en) * | 1986-04-21 | 1987-08-04 | E. I. Du Pont De Nemours And Company | Vapor-permeable liquid-impermeable fabric |
EP0341430A1 (en) * | 1988-05-07 | 1989-11-15 | Akzo N.V. | Textile layer laminate with a "breathable" film |
US5169712A (en) * | 1991-08-23 | 1992-12-08 | Amoco Corporation | Porous film composites |
DE4221562A1 (en) * | 1992-07-01 | 1994-01-13 | Metzeler Schaum Gmbh | Thermal insulation for sloping roofs |
DE4322745A1 (en) * | 1993-07-08 | 1995-01-12 | Ploucquet C F Gmbh | Roof-insulating panel |
DE4322747A1 (en) * | 1993-07-08 | 1995-01-12 | Ploucquet C F Gmbh | Waterproof membrane for roofs |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016134941A1 (en) * | 2015-02-24 | 2016-09-01 | Dsm Ip Assets B.V. | Roofing membrane and process for producing the roofing membrane |
Also Published As
Publication number | Publication date |
---|---|
ATA73495A (en) | 1996-05-15 |
AT401941B (en) | 1996-12-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE19642252C2 (en) | Diffusion-open roofing membrane and method for producing the same | |
DE602004006360T2 (en) | Membrane and process for its production | |
RU2418820C2 (en) | Microporous air-permeable structural materials containing coated woven and/or nonwoven materials, and method of producing said materials | |
DE4008043A1 (en) | TRAILER RAIL FOR ROOF TENSION RAILWAYS | |
DE3872920T2 (en) | Coated products. | |
EP0880628A2 (en) | Roof-lining material allowing diffusion and production method therefor | |
EP2065534A1 (en) | Construction material comprising a long-term UV stabilised, multilayered material | |
DE29805622U1 (en) | Diffusion-open and waterproof roofing membrane | |
EP0359165B1 (en) | Supporting web for sheets spread under a roof | |
EP2753767A1 (en) | Laminar sealing tape | |
AT401941B (en) | ROOF COVERING | |
EP0716176A2 (en) | Steam-permeable roof liner | |
EP0399952A1 (en) | Strip for making a construction watertight | |
DE10116477B4 (en) | Vapor-permeable and waterproof roofing membrane | |
WO1999055983A1 (en) | Watertight, water vapor-permeable flat material | |
WO2016198097A1 (en) | Composite tent tarpaulin and tent arrangement | |
EP0179162B1 (en) | Roof lining sheet | |
AT2948U1 (en) | UNDERCOVERING | |
DE3516605A1 (en) | SMOOTH SEALING MEMBRANE, IN PARTICULAR FOR ROOFS, CONSTRUCTED FROM A THERMOPLASTIC MATERIAL REINFORCED BY A GRILLE OF SYNTHETIC FIBERS AND A GRILLE OF GLASS FIBERS | |
EP0562447A1 (en) | Impervious sheet | |
DE4322747A1 (en) | Waterproof membrane for roofs | |
EP0990081B1 (en) | Diffusion-permeable roof boarding, roof lining or wind bracing board | |
DE8601670U1 (en) | Roofing membrane | |
DE10012997B4 (en) | Arrangement of a condensate absorption mat | |
DE4120777A1 (en) | Building roofing giving isotropic movement - contains a structured netting or nonwoven as a protective matting |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19960422 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE DE FR LU NL |
|
17Q | First examination report despatched |
Effective date: 19970902 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19980613 |