EP0169308B1 - Synthetic underroof membrane - Google Patents

Synthetic underroof membrane Download PDF

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Publication number
EP0169308B1
EP0169308B1 EP85103831A EP85103831A EP0169308B1 EP 0169308 B1 EP0169308 B1 EP 0169308B1 EP 85103831 A EP85103831 A EP 85103831A EP 85103831 A EP85103831 A EP 85103831A EP 0169308 B1 EP0169308 B1 EP 0169308B1
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EP
European Patent Office
Prior art keywords
rafters
roof
sheeting
roof lining
polyurethane
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.)
Expired
Application number
EP85103831A
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German (de)
French (fr)
Other versions
EP0169308A2 (en
EP0169308A3 (en
Inventor
Dieter Dipl.-Ing. Jablonka
Klaus Dipl.-Ing. Urban
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ewald Dorken & Co KG GmbH
EWALD DORKEN GmbH and Co KG
Original Assignee
Ewald Dorken & Co KG GmbH
EWALD DORKEN GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ewald Dorken & Co KG GmbH, EWALD DORKEN GmbH and Co KG filed Critical Ewald Dorken & Co KG GmbH
Priority to AT85103831T priority Critical patent/ATE44066T1/en
Publication of EP0169308A2 publication Critical patent/EP0169308A2/en
Publication of EP0169308A3 publication Critical patent/EP0169308A3/en
Application granted granted Critical
Publication of EP0169308B1 publication Critical patent/EP0169308B1/en
Expired legal-status Critical Current

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    • 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

Abstract

1. Roof lining made of synthetic sheeting for high pitched roofs and similar constructions, roof consisting of joists and rafters with insulating material between the rafters, rafters and insulating material covered with vapour trap sheeting on the inside of the roof, and on the outside of the roof rafters covered with the roof lining on which lateral rafters are fixed forming space for ventilation and finally rafters to carry the roofing tiles, characterized in that the roof lining (1) is made of polyurethane sheeting (2) coated on the side facing inside the building with bonded fabric (4), wich is closely attached to the polyurethane sheeting (2), the other side of wich is exposed as far as possible.

Description

Die Erfindung betrifft eine Unterspannbahn aus Kunststoff in Folienform für Steildächer und dergleichen, wobei das Dach aus Balken und Sparren besteht, zwischen den Sparren Wärmedämmaterial angeordnet ist, auf der Dachinnenseite die Sparren und das Wärmedämmaterial durch eine Dampfbremse und auf der Dachaussenseite die Sparren durch die Unterspannbahn abgedeckt sind, auf welcher eine Konterlattung unter Bildung eines Belüftungsraumes sowie eine Dachlattung angeordnet ist, welche als Träger der Dacheindeckung dient. Eine bekannte Unterspannbahn ist aus einer PE-Folie gebildet.The invention relates to a plastic roof membrane in sheet form for pitched roofs and the like, the roof consisting of beams and rafters, arranged between the rafters thermal insulation material, the rafters and the thermal insulation material by a vapor barrier on the roof inside and the rafters through the roof membrane on the outside of the roof are covered, on which a counter battens is arranged to form a ventilation space and a roof battens, which serves as a support for the roof covering. A known underlayment is formed from a PE film.

Diese bekannte Unterspannbahn dient dazu, die darunterliegenden Dachkonstruktionsteile und die im Dachausbau liegenden Räume vor eingetriebenem auftauendem Flugschnee, Regen sowie Staub und Russ zu schützen. Die Funktion dieser Unterspannbahn hängt jedoch wesentlich davon ab, dass die Belüftung des Daches einwandfrei funktioniert.This well-known roofing membrane is used to protect the roof construction parts underneath and the rooms in the loft conversion from flying snow, rain, dust and soot. However, the function of this sarking membrane essentially depends on the ventilation of the roof working properly.

Grundsätzlich ist die Belüftung des Daches von immer grösserer Bedeutung, weil in zunehmendem Masse Dachräume zu Wohnzwecken ausgebaut werden und hierdurch mehr Nutzungsfeuchte und Neubaufeuchte entsteht, die zudem durch stärkere Heizungsanlagen ausgetrieben wird.Basically, the ventilation of the roof is of increasing importance, because roof rooms are increasingly being expanded for residential purposes and this results in more usage moisture and new building moisture, which is also driven out by more powerful heating systems.

Des weiteren werden immer dickere Wärmedämmungen vorgesehen, durch die letzte Wärmeschutzverordnung bis zu 16 cm.Furthermore, increasingly thicker thermal insulation is provided, up to 16 cm due to the latest thermal protection regulation.

Bei solchen Dicken ist praktisch der gesamte Sparrenquerschnitt mit Wärmedämmung ausgefüllt, so dass für die Belüftung zwischen der Wärmedämmung und der Unterspannbahn kein Freiraum mehr bleibt. Dies wäre zwar nicht von so wesentlicher Bedeutung, wenn die Dampfsperre bzw. Dampfbremse ihre Funktion immer erfüllen würde.With such thicknesses, practically the entire cross-section of the rafters is filled with thermal insulation, so that there is no space left for ventilation between the thermal insulation and the underlay. This would not be so important if the vapor barrier or vapor barrier would always fulfill its function.

Als Dampfsperre sind häufig dünne Alufolien auf Papier, auch einstückig mit der Wärmedämmung, vorgesehen. Die häufig unzulängliche Verarbeitung durch den Handwerker oder den selbstinstallierenden Heimwerker führt jedoch dazu, dass die Funktion gar nicht oder nur unzureichend erfüllt werden kann, weil die dünne Alufolie durchstossen oder an den Stossstellen nicht ordnungsgemäss überlappend verlegt ist.Thin aluminum foils on paper, also in one piece with the thermal insulation, are often provided as a vapor barrier. However, the often inadequate processing by the craftsman or the self-installing handyman means that the function cannot be performed at all or only inadequately, because the thin aluminum foil is pierced or is not properly overlapped at the joints.

Sofern aber die Dampfsperre nicht ordnungsgemäss angebracht ist, ist die Belüftung zwischen Wärmedämmung und Unterspannbahn äusserst notwendig. Dies findet seinen Ausdruck auch in der neuen DIN 4108 sowie in den überarbeiteten Fachregeln des DDH.However, if the vapor barrier is not properly installed, ventilation between the insulation and the underlay is extremely necessary. This is also reflected in the new DIN 4108 and in the revised DDH rules.

Allerdings werden diese Regeln häufig aus Unkenntnis nicht beachtet.However, these rules are often ignored due to ignorance.

Es müssten nämlich die Planer und die Statiker schon einen höheren Sparren und damit einen grösseren freien Querschnitt vorsehen, damit noch Platz für die Belüftung bleibt.The planners and structural engineers would have to provide a higher rafter and thus a larger free cross-section so that there is still space for ventilation.

Des weiteren müsste der Planer, besonders im Traufbereich, Zuluftöffnungen vorsehen.Furthermore, the planner, especially in the eaves area, would have to provide supply air openings.

In der Regel werden aber Ausmauerungen bis zur Oberkante der Sparren ausgeführt.As a rule, however, brickwork is carried out up to the top edge of the rafters.

Selbst wenn die Planung ordnungsgemäss abläuft, müsste der Baustellenleiter die Tätigkeit auch des letzten Handwerkers daraufhin überwachen, dass die Zuluftöffnungen nicht aus Unkenntnis von Putzern oder dergleichen wieder zugeputzt werden.Even if the planning is proceeding properly, the site manager would have to monitor the activity of even the last craftsman to ensure that the supply air openings are not plastered again due to ignorance by cleaners or the like.

Sofern die entsprechenden Zuluftöffnungen und der entsprechende Freiraum zwischen Dämmung und Unterspannbahn nicht vorgesehen ist, entsteht in der Wärmedämmung bzw. an der Unterspannbahn Kondenswasserbildung, die zur Durchfeuchtung der Wärmedämmung mit allen negativen Auswirkungen führt.If the corresponding supply air openings and the corresponding free space between the insulation and the underlay are not provided, condensation forms in the thermal insulation or on the underlay, which leads to the dampening of the thermal insulation with all negative effects.

Um diese bestehenden Nachteile zu vermeiden, ist schon vorgeschlagen worden, PE-Folien zu perforieren, damit sich in der Wärmedämmung bzw. unterhalb der Unterspannbahn bildende Feuchtigkeit nach aussen austreten kann.In order to avoid these existing disadvantages, it has already been proposed to perforate PE films so that moisture forming in the thermal insulation or below the underlay can escape to the outside.

Jedoch hat die Perforation den Nachteil, dass Tropfwasser von aussen kapillar eintreten kann, wodurch der gewünschte Effekt nicht erreichbar ist.However, the perforation has the disadvantage that dripping water can enter capillary from the outside, which means that the desired effect cannot be achieved.

Ein anderer Vorschlag geht dahin, die Unterspannbahn aus hochreissfestem Polyester-Spinnvlies mit einer wasserabweisenden und atmungsaktiven Spezialbeschichtung herzustellen. Dazu muss ein relativ dickes Vlies benutzt werden, da dieses Vlies für den Beschichtungsvorgang eine erhebliche Eigenstabilität aufweisen muss. Die Beschichtung mittels einer Paste ist ebenfalls von erheblicher Dicke, was hohen Materialeinsatz nach sich zieht.Another suggestion is to manufacture the underlay from highly tear-resistant spunbonded polyester with a water-repellent and breathable special coating. A relatively thick fleece must be used for this, since this fleece must have considerable inherent stability for the coating process. The coating by means of a paste is also of considerable thickness, which results in a high use of materials.

Die wasserabweisende Ausrüstung schützt dabei die Konstruktionsteile und darunterliegende Räume vor auftauendem Flugschnee und Regen sowie Staub und Russ, wobei zusätzlich durch die Wasserdampfdurchlässigkeit des Materials ein Dampfdruckausgleich zwischen innen und aussen ermöglicht werden soll.The water-repellent finish protects the construction parts and the rooms underneath from thawing snow and rain, as well as dust and soot, while the water vapor permeability of the material should also enable vapor pressure equalization between inside and outside.

Eine derartige Unterspannbahn soll deshalb auch die unmittelbare Verlegung auf der Wärmedämmung ermöglichen.Such a sarking membrane should therefore also allow direct laying on the thermal insulation.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Unterspannbahn der eingangs bezeichneten Art zu schaffen, die so diffusionsoffen ist, dass eine Belüftung sich erübrigt, selbst wenn die Dampfsperre unzureichend vorgesehen ist, die unmittelbar auf die Wärmedämmung gelegt werden kann und somit die gesamte Sparrenhöhe für die Wärmedämmung nutzbar macht, die darüber hinaus so beschaffen ist, dass sie bei Stossbelastungen, zum Beispiel beim Austreiben der Neubaufeuchte, die Bildung von Tropfwasser oder dergleichen weitestgehend verhindert, und die bei wesentlich geringerem Einsatz an Material, nämlich Vlies und Beschichtung, eine hohe Festigkeit besitzt und grosstechnische Herstellung ermöglicht.Proceeding from this, the invention has for its object to provide a sarking membrane of the type mentioned, which is so open to diffusion that there is no need for ventilation, even if the vapor barrier is inadequate, which can be placed directly on the thermal insulation and thus the entire rafter height usable for the thermal insulation, which is also designed so that it largely prevents the formation of dripping water or the like in the event of impact loads, for example when driving out the new building moisture, and which with a significantly lower use of material, namely fleece and coating, a high Has strength and enables large-scale production.

Zur Lösung dieser Aufgabe schlägt die Erfindung vor, dass die Unterspannbahn aus einer Polyurethanfolie besteht, die einseitig, in der Einbaulage gebäudeseitig innenliegend mit einer Vliesschicht belegt ist, die mit der Polyurethanfolie innig verbunden ist und auf der dieser abgewandten Seite weitestgehend freiliegt.To achieve this object, the invention proposes that the underlay consists of a polyurethane film which is covered on one side, in the installed position on the inside of the building, with a non-woven layer which is covered with the polyurethane film lie is intimately connected and is largely exposed on the side facing away from this.

Der Begriff «weitestgehend freiliegt» ist so zu verstehen, dass die Vliesschicht nicht vollständig in die PU-Folie eingebettet ist, sondern die PU-Folie nur einseitig auf dem Vlies aufliegt. Durch die erfindungsgemässe Kombination einer wasserdampfdurchlässigen Polyurethanfolie mit einer bauseitig innenliegenden Vliesschicht wird eine gewisse Pufferwirkung erreicht, die es ermöglicht, auch bei Stossbelastungen Wasserdampf in ausreichendem Masse aufzunehmen und vorübergehend zu speichern, ohne dass dieser Wasserdampfüberschuss auskondensiert.The term “largely exposed” should be understood to mean that the nonwoven layer is not completely embedded in the PU film, but rather the PU film only lies on one side of the nonwoven. The combination according to the invention of a water-vapor-permeable polyurethane film with a non-woven layer provided by the customer achieves a certain buffer effect, which makes it possible to absorb and store water vapor to a sufficient extent even in the event of shock loads, without this excess water vapor condensing out.

Die Vliesschicht stellt also einen Feuchtigkeitsspeicher dar, der nach aussen hin durch eine wasserdichte, aber hervorragend dampfdurchlässige Beschichtung abgeschirmt ist. Überdies kann diese erfindungsgemässe Unterspannbahn auch unmittelbar auf die Wärmedämmung gelegt werden, wobei es weiterhin unerheblich ist, ob die Dampfsperre ordnungsgemäss oder überhaupt vorgesehen ist.The fleece layer thus represents a moisture accumulator that is shielded from the outside by a waterproof, but outstandingly vapor-permeable coating. In addition, this sarking membrane according to the invention can also be placed directly on the thermal insulation, it still being irrelevant whether the vapor barrier is provided properly or at all.

Ein besonderer Vorteil der erfindungsgemässen Unterspannbahn ist noch darin zu sehen, dass die Vliesschicht als Träger für die folienartige PU-Beschichtung dient, wodurch eine äusserst geringe Dickenbemessung der PU-Folienschicht und der Vliesschicht möglich ist, was aus Gründen der Materialkosten vorteilhaft ist.A particular advantage of the underlay according to the invention can also be seen in the fact that the nonwoven layer serves as a carrier for the film-like PU coating, as a result of which the PU film layer and the nonwoven layer can be made extremely thin, which is advantageous for reasons of material costs.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen bezeichnet.Advantageous further developments are described in the subclaims.

Durch die Einbindung des Netzes ist es möglich, die PU-Folienschicht so dünn auszubilden, dass diese nur ihre Funktion hinsichtlich der Abschirmung nach aussen und der Wasserdampfdurchlässigkeit ausgelegt werden kann, während auch die Vliesschicht ledigleich auf ihr gewünschtes Speichervolumen auszulegen ist.By integrating the network, it is possible to make the PU film layer so thin that it can only be designed for its function with regard to external shielding and water vapor permeability, while the fleece layer is also only to be designed for its desired storage volume.

Das Netz übernimmt praktisch die tragende Funktion dieser kombinierten Unterspannbahn.The network practically takes on the supporting function of this combined roofing membrane.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und im folgenden näher beschrieben. Es zeigt:

  • Fig. eine Unterspannbahn als Ausschnitt in Ansicht;
  • Fig. 2 desgleichen im Schnitt 11-11 der Fig. 1.
An embodiment of the invention is shown in the drawing and described in more detail below. It shows:
  • Fig. An underlay as a cutout in view;
  • 2 likewise in section 11-11 of FIG. 1.

Die Unterspannbahn 1 besteht aus einer Polyurethanfolie 2, einem Netz 3 aus Kunststoff sowie einer Vliesschicht4, beispielsweise einem Wirrfaservlies. In der Einbaulage ist die Vliesschicht 3 gebäudeinnenseitig angeordnet.The underlay 1 consists of a polyurethane film 2, a mesh 3 made of plastic and a non-woven layer 4, for example a random fiber fleece. In the installed position, the fleece layer 3 is arranged on the inside of the building.

Die PU-Folie 2 ist einseitig auf eine Vliessschicht4 im Wege des Extrudierens aufgebracht und mit dieser stoffschlüssig und ohne Verbindungshilfmittel verbunden.The PU film 2 is applied on one side to a nonwoven layer 4 by extrusion and is connected to it in a material-locking manner and without connecting aids.

Das Netz 3 ist zwischen PU-Folie 2 und Vliesschicht4 angeordnet. Bei der Fertigung wird auf die dünne Vliesschicht4 das Netz3 gelegt und die PU-Folie 2 auf diese Schicht extrudiert, wobei sie eine innige Verbindung mit der Vliesschicht4 eingeht und das Netz 3 durch die verbundenen Schichten 2 und 4 gehalten ist.The mesh 3 is arranged between the PU film 2 and the nonwoven layer 4. During manufacture, the mesh 3 is placed on the thin fleece layer 4 and the PU film 2 is extruded onto this layer, whereby it forms an intimate connection with the fleece layer 4 and the mesh 3 is held by the connected layers 2 and 4.

Die dünne PU-Folie 2 ist wasserdampfdurchlässig, aber feststoff- und flüssigkeitsundurchlässig.The thin PU film 2 is permeable to water vapor, but impermeable to solids and liquids.

Die Vliesschicht 4 dient als Flüssigkeitsspeicher für vorübergehend aus dem Wasserdampf auskondensierende Flüssigkeit, die von der Vliesschicht 4 gespeichert und langsam durch die PU-Folie 2 abgegeben wird, bis ein Dampfdruckausgleich erreicht ist.The fleece layer 4 serves as a liquid store for liquid which temporarily condenses out of the water vapor, which is stored by the fleece layer 4 and is slowly released through the PU film 2 until a vapor pressure equalization is achieved.

Die Vliesschicht 4 kann entsprechend ihrer gewünschten Speicherkapazität dünner oder dicker bemessen sein.The fleece layer 4 can be dimensioned to be thinner or thicker in accordance with its desired storage capacity.

Claims (5)

1. Roof lining made of synthetic sheeting for high pitched roofs and similar constructions, roof consisting of joists and rafters with insulating material between the rafters, rafters and insulating material covered with vapour trap sheeting on the inside of the roof, and on the outside of the roof rafters covered with the roof lining on which lateral rafters are fixed forming space for ventilation and finally rafters to carry the roofing tiles, characterized in that the roof lining (1) is made of polyurethane sheeting (2) coated on the side facing inside the building with bonded fabric (4), which is closely attatched to the polyurethane sheeting (2), the other side of which is exposed as far as possible.
2. Roof lining as in Claim 1, characterized in that the polyurethane sheeting (2) is reinforced with an embedded net (3).
3. Roof lining as in Claims 1 and 2, characterized in that one side of the polyurethane sheeting (2) is covered with bonded fabric (4), e.g. polyethylene bonded fabric, whereby the net (3) of synthetic material, e.g. polyethylene, is attatched between the sheeting (2) and the bonded fabric (4), integrated with the fabric and free of adhesive agents.
4. Roof lining as in Claims 1 bis 3, characterized in that the weight of the roof lining totals about 100 g/m2 plus net (3).
EP85103831A 1984-07-13 1985-03-29 Synthetic underroof membrane Expired EP0169308B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85103831T ATE44066T1 (en) 1984-07-13 1985-03-29 PLASTIC SURFACE RAILWAY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3425794 1984-07-13
DE3425794A DE3425794A1 (en) 1984-07-13 1984-07-13 PLASTIC UNDERLAYER

Publications (3)

Publication Number Publication Date
EP0169308A2 EP0169308A2 (en) 1986-01-29
EP0169308A3 EP0169308A3 (en) 1987-03-04
EP0169308B1 true EP0169308B1 (en) 1989-06-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103831A Expired EP0169308B1 (en) 1984-07-13 1985-03-29 Synthetic underroof membrane

Country Status (3)

Country Link
EP (1) EP0169308B1 (en)
AT (1) ATE44066T1 (en)
DE (2) DE3425794A1 (en)

Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP0708212A1 (en) 1994-10-20 1996-04-24 Ewald Dörken Ag Under-roof membrane, particularly suited for heat insulated sloping roofs
WO1997030244A2 (en) * 1996-02-13 1997-08-21 Klöber, Johannes Roof-lining material allowing diffusion and production method therefor
DE19725451A1 (en) * 1997-06-16 1998-12-24 Caplast Kunststoffverarbeitung Foamed plastic composite especially for use as underroof membrane
WO1999055983A1 (en) 1998-04-29 1999-11-04 Lafarge Braas Roofing Accessories Gmbh & Co. Watertight, water vapor-permeable flat material
DE102008033891A1 (en) 2008-07-18 2010-02-04 Ipt Gmbh & Co. Kg Roof substrate strip consists of strip-shaped base material made of polypropylene spunbonded nonwoven with a surface coating based on polyacrylate or pure acrylate, where the coating is subjected in two coating orders and/or in fluid form

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ATE184949T1 (en) * 1994-12-12 1999-10-15 Kloeber Johannes DIFFUSION FILM, ESPECIALLY IN THE FORM OF A SUPPORT MEMBRANE FOR ROOFS
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0708212A1 (en) 1994-10-20 1996-04-24 Ewald Dörken Ag Under-roof membrane, particularly suited for heat insulated sloping roofs
WO1997030244A2 (en) * 1996-02-13 1997-08-21 Klöber, Johannes Roof-lining material allowing diffusion and production method therefor
DE19725451A1 (en) * 1997-06-16 1998-12-24 Caplast Kunststoffverarbeitung Foamed plastic composite especially for use as underroof membrane
WO1999055983A1 (en) 1998-04-29 1999-11-04 Lafarge Braas Roofing Accessories Gmbh & Co. Watertight, water vapor-permeable flat material
DE102008033891A1 (en) 2008-07-18 2010-02-04 Ipt Gmbh & Co. Kg Roof substrate strip consists of strip-shaped base material made of polypropylene spunbonded nonwoven with a surface coating based on polyacrylate or pure acrylate, where the coating is subjected in two coating orders and/or in fluid form
DE202008017740U1 (en) 2008-07-18 2010-05-27 Ipt Gmbh & Co. Kg Base material with multi-layer, at least one side applied, aqueous, provided with fillers and additives, solvent-free coating based on acrylate, their composition / s, production and use

Also Published As

Publication number Publication date
DE3571057D1 (en) 1989-07-20
EP0169308A2 (en) 1986-01-29
EP0169308A3 (en) 1987-03-04
ATE44066T1 (en) 1989-06-15
DE3425794A1 (en) 1986-01-23

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