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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3498402

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (7)

Family Cites Families (2)

• 1995
  • 1995-04-27 AT AT73495A patent/AT401941B/de not_active IP Right Cessation
• 1996
  • 1996-04-22 EP EP96106262A patent/EP0740027A1/fr not_active Withdrawn

Patent Citations (7)

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