EP3015598B1 - Use of a roofing underlay in a steep-pitched roof with adjacent roof surfaces - Google Patents

Description

The present invention relates to a use of a sub-roof track in pitched roofs with adjacent roof surfaces according to claim 1.

Roofing membranes have been known from practice for years. Their task is primarily to produce the watertightness under the hard roofing in the pitched roof.
As a sheet product, the sub-roof sheet is fixed in strips on a roof. However, wind can penetrate between the webs and reduce the effect of the insulation by convection and flowing through. The remedy here is to connect the tracks with each other. This can be achieved by using an adhesive tape or - especially easy to install - by seam self-adhesive.
In a variant further improved with respect to the security against gluing, the use of two opposing adhesive surfaces is provided, so that in the end adhesive is glued into adhesive. These adhesive zones must be on different sides of the sub-roof, as in Fig. 1 is shown.
From the prior art according to the DE 10128078 A1 Furthermore, geomembranes for facades are known in which the adhesive zones lie on the same side of the web.

For simple pitch roof geometries, such as pitched roofs and pitched roofs, the sub-roof track pre-decking described above is sufficient to allow for efficient material utilization.
For more difficult geometries, in particular those in which adjacent roof surfaces, such as hipped roofs, Krüppelwalmdächern or roofs with throats, however, there is the problem that large amounts of waste occur, which easily account for more than 20% of the material used. This is in Fig. 2 shown. The more the shape approaches from the trapezoid to the triangle, the more extensive the blend will be. This is due to the fact that the webs are laid over overlapping so that there is no Hinterläufigkeit for water.

The same problem arises even if only one adhesive zone is present and the mating surface is free of adhesive. In this case too, the overlapping laying leads to a corresponding waste being dropped.

The EP 2 527 530 A1 discloses a bituminous roofing membrane with an at least single-layer carrier layer. The carrier layer comprises a nonwoven, which is either impregnated with bitumen or embedded in a polymer plastic. In addition, in the longitudinal direction of the web, top and bottom bitumen strips are provided, wherein the top-side bitumen strips are offset from the bottom bitumen strips in the transverse direction of the web by one strip width.
From the WO 01/90506 A1 is a roofing membrane projecting, which has a carrier layer and disposed on at least one side of the carrier layer and spaced from each other strips of bituminous material.
In the WO 2013/085700 A1 a thermoplastic cover sheet is disclosed. On one side of the film, a complete adhesive application is provided, wherein on the opposite side only a longitudinal edge-side adhesive application is provided.
The DE 10 2009 050 246 A1 discloses a web for building purposes, on the side of which adhesive strips are provided for bonding.

The EP 2 339 088 A2 discloses a vapor barrier as a film element in the thermal insulation of buildings, wherein the vapor barrier has grid-like markings as Schnitthilfslinien to form a cut pattern.

The task is now to use a self-adhesive web, which can be used without appreciable waste especially on pitched roofs with adjacent roof surfaces.

The above object is achieved by the use of a sub-roof sheet having the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

The same page is the page that is facing down when installed, unlike this Fig. 3 is shown. This allows the web to be rotated by 180 ° even with overlapping laying in the plane and laid without waste.
The adhesive zones at the edges can be designed differently. This can relate to both the choice of adhesive, the width of the adhesive application and / or the grammage of the adhesive application.
The adhesive zones can also be continuous or interrupted, preferably as strips.
In the case of bonding a plurality of webs to a sealing layer of sub-roof webs, the mating surface is preferably designed as a film-like surface in order to allow windproof and / or airtight bonding. According to the invention, sub-roof sheets are multi-layer products which contain a nonwoven layer. This hampers the secure bonding with only one side adhesive zones. In a further development of the invention, therefore, an edge-side portion is free of the further layer, in particular the nonwoven layer, wherein on the free area then the adhesive zone is at least partially provided. This is in Fig. 4 shown. In addition to a nonwoven plane, a film layer may be provided, by the way. The nonwoven and / or film layer preferably serves as a support layer for a vapor-permeable layer in the form of a breathable film. Thus, the sub-roof membrane is a total of diffusion. This means, of course, that the additional layers provided in addition to the functional layer are likewise open to diffusion.
In a preferred embodiment of the invention, the web is provided with four adhesive zones, two adhesive zones being provided on top of the panel and two adhesive zones on the bottom of the panel. The adhesive zones are on the top and bottom side offset at an edge to each other, as is the case Fig. 5 results. Preferably, the adhesive zones are arranged so staggered that the formation of thick places when rolling roles is reduced.

Again, all 4 adhesive zones may be different, but preferred are the adhesive zones 1a and 1b and 2a and 2b (see. Fig. 5 ) and allow the gluing "glue in glue".

Alternatively, individual zones can be formed only as a specially trained counter surface for the adhesive zone of the other web. This is done e.g. by covering with a liner, for example, to keep out moisture / dirt. In another variant, the counter surfaces are e.g. surface-treated by varnish and optionally additionally covered by a liner.

In order to facilitate easier laying, in particular in the case of regular hipped roofs, the individual lanes may also be provided on the upper side with at least one cutting mark. The cut mark preferably has auxiliary lines for possible cuts. In Fig. 6 a cut mark is shown with auxiliary lines that run at angles of 30 °, 45 ° and 60 °. On a web, a plurality of cut marks are preferably provided which repeat periodically. The cutting mark or the individual auxiliary lines of the cutting mark can be realized by a printing and / or embossing in the surface.

The web used as such is preferably roll goods with a web length between 30 m and 100 m, in particular of about 50 m. The width of the web is preferably between 1 m and 3 m and in particular about 1.5 m.

• Wasserdampfdurchlässigkeit der Bahn: sd-Wert < 0,3m und/oder
• Grammatur der Folie der Bahn: 10-200 g/m2, bevorzugt 30-150 g/m2, weiter 50-100 g/m2 und/oder
• Grammatur des Vlieses der Bahn: 20-500 g/m², bevorzugt 50-300 g/m², weiter 70-200 g/m² und/oder
• Breite der Klebezone: cm und/oder
• Anzahl der Streifen pro Klebezone: 1-15, bevorzugt 3-12, weiter 5-9 und/oder
• Streifenbreite eines Streifens: 1-30 mm, bevorzugt 1,5-10 mm, weiter 2-5 mm und/oder
• Flächengewicht des Klebers: 50-500 g/m², bevorzugt 75-300 g/m² weiter 100-150 g/m² und/oder
• Randüberstand der Beschichtung: 2-90 mm, bevorzugt 4-30 mm, weiter 8-15 mm und/oder
• Platzierung der Klebezone: 1-90 mm vom Rand entfernt, bevorzugt 3-70 mm, weiter 5-50 mm und/oder
• verwendeter Kleber: a) Hotmelts auf Basis Polyolefin, Polyamid, Polyurethan und/oder Acrylat und/oder
  • b) Getrocknete Dispersionen oder Lösungen von Acrylaten und/oder Poyurethanen und/oder
• Auftragstechnik: Zulauf vorgefertigter Klebebänder oder Inline-Auftrag aus einer Düse und erkalten bzw. trocknen

Moreover, the web is preferably characterized by the following material properties or ranges, which may be provided by themselves or in any desired combination with one another:

• Water vapor permeability of the web: sd value <0.3 m and / or
• Grammage of the film of the web: 10-200 g / m 2, preferably 30-150 g / m 2, further 50-100 g / m 2 and / or
• Grammage of the web of the web: 20-500 g / m ² , preferably 50-300 g / m ² , further 70-200 g / m ² and / or
• Width of the gluing zone: cm and / or
• Number of strips per adhesive zone: 1-15, preferably 3-12, further 5-9 and / or
• Strip width of a strip: 1-30 mm, preferably 1.5-10 mm, further 2-5 mm and / or
• Basis weight of the adhesive: 50-500 g / m ² , preferably 75-300 g / m ² further 100-150 g / m ² and / or
• Edge overhang of the coating: 2-90 mm, preferably 4-30 mm, further 8-15 mm and / or
• Placement of the gluing zone: 1-90 mm from the edge, preferably 3-70 mm, further 5-50 mm and / or
• used adhesive: a) hot melts based on polyolefin, polyamide, polyurethane and / or acrylate and / or
  • b) Dried dispersions or solutions of acrylates and / or polyurethane and / or
• Application technology: Supply of prefabricated adhesive tapes or inline application from a nozzle and cool or dry

• 1a) Ein 110 g/m2 Polyester-Nadelvlies wird mit 90 g/m2 TPU extrusionsbeschichtet. Es ergibt sich eine diffusionsoffene Bahn. Dabei steht die Beschichtung an beiden Rändern 15 mm über. Kurz nach dem Erkalten laufen an beiden Rändern ieweils auf der Vliesseite vorgefertigte Klebestreifen zu. Dabei handelt es sich um ein Dispersionsacrylat mit aufgebrachtem Liner. Die Klebestreifen weisen eine Breite von 40 mm und ein Flächengewicht von 125 g/m2 auf und werden 3 mm vom Rand der Beschichtung platziert.
• 1b) In einer Variante von 1a) laufen bei der Beschichtung auf der Beschichtungsseite an beiden Rändern jeweils 90 mm breite Liner direkt auf die Beschichtung zu und decken die Gegenfläche ab. Platzierung 5 mm vom Rand entfernt.
• 2) Ein thermisch verfestigtes 70 g/m2 Polypropylen-Spinnvlies wird mit einem weiteren thermisch verfestigten 40 g/m2 Polypropylen-Spinnvlies und einem 25 g/m2 atmungsaktiven Film ("Breathable Film") zu einem dreischichtigen Verbund thermisch laminiert, bei dem die Vliesschichten außen liegen. Anschließend werden mit beheizten Düsen Polyolefin-Hotmelts gemäß Fig. 5 aufgetragen und mit einem Liner abgedeckt.
  Klebezonen 1a und 1b:
  • Breite 30 mm, Grammatur 80 g/m2, Platzierung 10 mm vom Rand entfernt
  Klebezonen 2a und 2b:
  • 9 Streifen, Streifenbreite 3 mm, Klebezonenbreite 60 mm, Grammatur 50 g/m2, Platzierung 45 mm vom Rand entfernt.
• 3a) Ein thermisch verfestigtes 60 g/m2 Polypropylen-Spinnvlies wird mit einem 30 g/m2 atmungsaktiven Film ("Breathable Film") zu einem zweischichtigen Verbund thermisch laminiert. Auf der Vliesseite werden jeweils 20 mm vom Rand entfernt Polyolefinhotmelts aufgetragen und mit einem Liner abgedeckt.
  Klebezone 1:
  • Breite 30 mm, Grammatur 110 g/m2
  Klebezone 2:
  • 3 Streifen, Streifenbreite 10 mm, Klebezonebreite 55 mm, Grammatur 115 g/m2
• 3b) Der zweischichtige Verbund aus 3a) wird mit einem 40 g/m2 Polypropylendrehergewebe und einem 20 g/m2 Polypropylen Spinnvlies zu einem 4-lagigen Laminat verklebt, so dass sich die Vliesseiten außen befinden. Anschließend werden Klebezonen aus angedicktem Lösungsmittelacrylat gemäß Fig. 5 aufgetragen, thermisch getrocknet und mit einem Liner abgedeckt.
  Klebezonen 1a und 1b:
  • Breite 15 mm, Grammatur 40 g/m2, Platzierung 50 mm vom Rand entfernt
  Klebezonen 2a und 2b:
  • 11 Streifen, Streifenbreite 4 mm, Klebezonenbreite 90 mm, Grammatur 100 g/m2, Platzierung 5 mm vom Rand entfernt.
• 4) Ein thermisch verfestigtes 120 g/m2 Polyester-Spinnvlies wird mit einer Acrylatdispersion beschichtet und getrocknet, so dass sich ein Gesamtflächengewicht von 220 g/m2 ergibt. Anschließend werden an beiden Rändern auf der Vliesseite vorgefertigte Klebebänder aus UV-vernetzbarem Reinacrylat appliziert und mit einem Liner abgedeckt.

5 Streifen, Streifenbreite 2 mm, Klebezonenbreite 50 mm, Grammatur 85 g/m2, Platzierung 15 mm vom Rand entfernt.
Die Gegenfläche wird auf einer Breite von 100 mm mit 20 g/m2 nicht klebriger Acrylatdispersion lackiert und getrocknet und stellt damit einen besonders sicheren Verklebungspartner dar.Hereinafter, embodiments of the invention will be described. Even features of individual embodiments can be used in other embodiments or exchanged for existing there features without departing from the subject matter of the invention defined by the claims.

• 1a) A 110 g / m2 polyester needle punched nonwoven is extrusion coated with 90 gsm TPU. This results in a vapor-permeable path. The coating is 15 mm above both edges. Shortly after cooling, pre-fabricated adhesive strips run on both sides of the fleece side. This is a dispersion acrylate with applied liner. The adhesive strips have a width of 40 mm and a basis weight of 125 g / m2 and are placed 3 mm from the edge of the coating.
• 1b) In a variant of 1a) during the coating on the coating side, 90 mm wide liners at both edges run directly onto the coating and cover the counterface. Placement 5 mm from the edge.
• 2) A thermally bonded 70 gsm polypropylene spunbonded web is thermally laminated with another thermally bonded 40 gsm polypropylene spunbonded web and a 25 gsm breathable film to form a three-layer bond in which the nonwoven webs lie outside. Then be with heated nozzles polyolefin hot melt according to Fig. 5 applied and covered with a liner.
  Adhesive zones 1a and 1b:
  • Width 30 mm, weight 80 g / m2, placed 10 mm from the edge
  Adhesive zones 2a and 2b:
  • 9 strips, strip width 3 mm, adhesive zone width 60 mm, weight 50 g / m2, placement 45 mm from the edge.
• 3a) A thermally bonded 60 g / m2 polypropylene spunbonded nonwoven is thermally laminated with a 30 gsm breathable film to form a two-layer composite. On the nonwoven side, polyolefin hotmelt is applied 20 mm from the edge and covered with a liner.
  Adhesive zone 1:
  • Width 30 mm, grammage 110 g / m2
  Adhesive zone 2:
  • 3 strips, strip width 10 mm, gluing zone width 55 mm, weight 115 g / m2
• 3b) The two-layer composite from 3a) is glued to a 4-ply laminate with a 40 g / m2 polypropylene twisted fabric and a 20 g / m2 polypropylene spunbonded nonwoven, so that the fleece sides are on the outside. Adhesive zones are then prepared from thickened solvent acrylate according to Fig. 5 applied, thermally dried and covered with a liner.
  Adhesive zones 1a and 1b:
  • Width 15 mm, grammage 40 g / m2, placement 50 mm from the edge
  Adhesive zones 2a and 2b:
  • 11 strips, strip width 4 mm, adhesive zone width 90 mm, grammage 100 g / m2, placement 5 mm from the edge.
• 4) A thermally bonded 120 g / m2 polyester spunbond is coated with an acrylate dispersion and dried to give a total basis weight of 220 g / m2. Subsequently, on both sides of the non-woven side, pre-fabricated adhesive tapes of UV-crosslinkable pure acrylate are applied and covered with a liner.

5 strips, strip width 2 mm, adhesive zone width 50 mm, weight 85 g / m2, placement 15 mm from the edge.
The mating surface is lacquered and dried over a width of 100 mm with 20 g / m2 non-tacky acrylate dispersion and thus represents a particularly secure bonding partner.

Claims (14)

1. A use of a roofing underlay in steep-pitched roofs with adjacent roof surfaces, comprising adhesive zones on the longitudinal-edge sides, wherein, in each longitudinal-edge region, an adhesive zone, each having a width of between 2 and 10 cm, is provided on the underside of the membrane which is downward-facing in the installed state of the membrane, the roofing underlay being formed in multiple layers and comprising at least one non-woven layer and a breathable film, and the roofing underlay being diffusion permeable and having an S_d value < 0.5 m.
2. The use according to claim 1, characterised in that the edge-side adhesive zone is spaced apart from the outer longitudinal edge of the membrane.
3. The use according to claim 1 or 2, characterised in that the adhesive zones are strip-shaped and, where appropriate, are formed as interrupted strips.
4. The use according to any one of the preceding claims, characterised in that the adhesive zones are differently formed in the various longitudinal-edge regions of the membrane and in that, preferably, the adhesive zones comprise a different adhesive, have a different width of the adhesive application, a different number of adhesive strips and/or a different mass per unit area of the adhesive application.
5. The use according to any one of the preceding claims, characterised in that the adhesive zones are formed such that, on bonding with a neighbouring roofing underlay, a windproof and/or airtight bond results.
6. The use according to any one of the preceding claims, characterised in that one layer of the membrane has a smaller width than another layer of the membrane and in that, in the edge-side subregion of the shorter layer, adhesive is provided, at least in regions of an adhesive zone.
7. The use according to claim 6, characterised in that the adhesive of the adhesive zone of the edge-side subregion overlaps the layer having smaller width.
8. The use according to any one of the preceding claims, characterised in that an adhesive zone is provided on both the upper and lower sides of the longitudinal edge.
9. The use according to any one of the preceding claims, characterised in that the adhesive zones provided on the upper and lower sides on an edge of the membrane are arranged offset with respect to one another.
10. The use according to any one of the preceding claims, characterised in that the offset of the upper-side and lower-side adhesive zones in a longitudinal-edge region of the membrane are selected such that, on bonding of neighbouring membrane, an adhesive-in-adhesive bond is created between adhesive zones of neighbouring membranes.
11. The use according to any one of the preceding claims, characterised in that the structure is such that the mating surfaces for the adhesive zone of another membrane is covered and/or surface treated with a liner, in particular by means of a lacquer.
12. The use according to any one of the preceding claims, characterised in that at least one cutting mark is provided on the upper side and/or lower side of the membrane and in that, preferably, a plurality of periodically recurring cutting marks are provided over the length of the membrane.
13. The use according to claim 12, characterised in that the cutting mark comprises auxiliary lines at an angle to the longitudinal direction of the membrane and in that, preferably, the cutting mark comprises auxiliary lines at an angle of at least 30°, 45° and/or 60°.
14. The use according to claim 13, characterised in that the auxiliary lines are generated by printing and/or embossing on the upper and/or lower side of the membrane.

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