WO1992008022A1

WO1992008022A1 - Sealing layer

Info

Publication number: WO1992008022A1
Application number: PCT/SE1991/000724
Authority: WO
Inventors: Alf Karl Johan BÄLLGREN
Original assignee: Mataki AB
Current assignee: Mataki AB
Priority date: 1990-10-29
Filing date: 1991-10-29
Publication date: 1992-05-14
Anticipated expiration: 1993-04-29
Also published as: SE9003435L; SE467418B; SE9003435D0

Abstract

A sealing layer which is adapted to be shaped with at least one upwardly curving edge portion and to be applied adjacent to an upwardly directed surface, with the upwardly curving edge portion located adjacent to said surface, and which is designed for application to roofs as a covering layer thereon, is mouldable into shape permanence so as permanently to form the upwardly curving edge portion or portions prior to the mounting of the sealing layer and possesses such rigidity that its upwardly curving edge portion or portions retain or substantially retain their shape after the mounting of the sealing layer adjacent to the upwardly directed surface. Being, furthermore, relatively inexpensive and material-saving as it may comprise only two layers, which facilitates the sealing thereof to an existant roof covering, such a sealing layer (1) is characterised in that it comprises at least one upper layer (10) of bituminous material, preferably asphalt material, and at least one subjacent metal layer (9) with apertures (9) therein, preferably a metal netting, and that bituminous material (10a) from the upper layer (10) engages the apertures (9a) of the metal layer as a result of the material (10a) from the bituminous layer (10) having been heated and thus caused to melt into the apertures (9a) of the metal layer (9).

Description

Sealing layer.

This invention relates to a sealing layer which is adapted to be shaped with at least one upwardly curving edge portion and to be applied adjacent to an upwardly di¬ rected surface, with the upwardly curving edge portion lo- cated adjacent to said surface. The sealing layer is de¬ signed for application to roofs as a covering layer thereon, is mouldable into shape permanence so as permanently to form the upwardly curving edge portion or edge portions prior to the mounting of the sealing layer and possesses such rigidity that its upwardly curving edge portion or edge portions retain or substantially retain their shape after the mounting of the sealing layer adjacent to the upwardly directed surface.

At the transition between a roof surface and an associated wall surface or the like, the roof surface and the wall surface have usually both been coated with cove¬ ring material without provision of any construction joint between the roof and the wall. If the roof and the wall move relative to one another the covering material will readily crack in the fold between the roof-covering part and the wall-covering part. Particularly, roofs construc¬ ted in the fifties and sixties show such damages.

To repair roofs impaired by such damages, a new layer of roof covering material can be laid onto the dama- ged material. The new sealing layer is laid on the roof surface, folded upwards along the wall surface and heat sealed to another sealing layer placed on the roof at a distance from the wall. In such a case, heat sealing with an open flame must not be carried out close to the wall as this would imply a very great risk of fire. Therefore, the new sealing layers placed on the roof and folded upwards along the wall must be given sufficiently large dimensions to make the sealing thereof possible at a sufficiently large distance from the wall. If the wall has a covering metal sheet applied to it this sheet often has to be dismounted in order to make it possible to extend the sealing layer to a satisfactor}- height on the wall. Dismounting of the covering metal sheet often necessitates cutting it and mounting it in position again after the application of the sealing layer, which is a circumstantial and time-consuming procedure.

Another problem is that the upwardly curving edge por¬ tions of readily flexible sealing layers frequently do not remain in their upwardly directed positions but subside, particularly so if they have not been mechanically anchored. This makes the mounting of the sealing layers more diffi¬ cult and even though they remain in position during the mounting proper and subside later on, they risk to lose their wall sealing capacity.

Today, however, there are also available sealing layers of materials mouldable into greater shape permanence. One such embodiment is described in EP, Al, 0 123 141 which discloses a sealing material which is mouldable into shape permanence and which includes an insert in the form of a metal wire netting. The insert is wholly embedded in the roof covering material which comprises two elastomer layers, preferably of rubber. When applied to roofs the material should, however, be coated with a further layer of bitumen or other sealing composition.

The sealing layer according to the present invention is characterised in that it comprises at least one upper layer of bituminous material, preferably asphalt material, and at least one subjacent metal layer with apertures therein, preferably a metal netting, and that bituminous material from the upper layer engages the apertures of the metal layer as a result of the material from the bituminous layer having been heated and thus caused to melt into the apertures of the metal layer. The sealing layer according to the present invention thus is relatively inexpensive and material-saving since it may consist of only two layers, viz. an upper bituminous layer and a lower metal layer. As one of the layers is of the same material that sealing layers for roof covering purposes usually consist of, the sealing of another roof covering to the sealing layer according to the invention is facilitated. No further layer for this purpose or for the requisite sealing need be applied over the sealing layer. As, moreover, material from one layer, the bitu¬ minous layer, penetrates into the apertures of the other layer, the metal layer, the sealing layer according to the invention can be sealed to the existant roof covering without it being necessary to apply, for this purpose, any further layer of bituminous material to the underside of the metal layer. The sealing layer according to the invention thus provides the effect aimed at, viz. an inexpensive and simple manufacture of the sealing layer, an inexpensive and simple formation thereof and an inexpensive and simple mounting of the same, while retaining the shape imparted to it and making it possible to seal the sealing layer to the existant roof covering and/or to apply a new roof covering on top of the same. This is realised with the lowest possible number of various layers that are formed and that cooperate in a special way. Of course, the novel sealing layer can furthermore be made sufficiently large so that heat sealing can be performed at an adequate distance from the wall, and in spite of its size the sealing layer is easy to handle when mounted in position at the wall. In case upwardly curving edge portions of the sealing layer have to be pushed in beneath covering metal sheets, said metal sheets need to be dismounted since it is not necessary to fix the upwardly curving edge portions to the wall be¬ neath the metal sheets. Moreover, the sealing layer accor¬ ding to the invention constitutes a movement-absorbing ele- ment as there is no connection between any vertical sur¬ face of the building structure and the sealing layer. The invention will be elucidated more in detail herein¬ after with reference to the accompanying drawings, in which: fig. 1 illustrates part of a sealing layer according to the invention in a perspective view, various layers comprised in the sealing layer having been cut at various "points fig. 2 illustrates a section of the sealing layer according to the invention on line II-II in fig. 1; fig. 3 illustrates the sealing layer according to the invention in a side view at the mounting of the layer on a roof; and fig. 4 illustrates the sealing layer shown in fig. 3 in position on the roof after the mounting of the layer. The sealing layer 1 shown in the drawings is adapted for use as roof covering material. The sealing layer 1 is also adapted to be formed with at least one upwardly cur¬ ving edge portion la and to be applied adjacent to an up¬ wardly directed surface 2, with the upwardly curving edge portion la located adjacent to said surface 2, preferably without being attached thereto. The upwardly directed sur¬ face 2 may be one side of a wall 3 or another part of a building that projects above the roof surface 4.

The sealing layer 1 is mouldable into shape permanence so that the upwardly curving edge portion la or the up- wardly curving edge portions can be formed prior to the mounting of the sealing layer. Moreover, the sealing layer 1 has such a rigidity that its upwardly curving edge portion or edge portions la retain or substantially retain their shape after the mounting of the sealing layer adja- cent to the upwardly directed surface 2.

Furthermore, the sealing layer 1 is mouldable, pre¬ ferably by manual permanent conformation, into a planar or substantially planar part lb and is formed by manual bending with at least one edge portion la which extends at right angles or substantially right angles to the planar part lb. As a result, the sealing layer 1 is brought into its final or approximately final shape by manual work input at the site itself after the height of the upwardly curving edge portion la and the widht of the other, planar part lb has been determined. At the mounting of the sealing layer 1 an existant sealing layer 5 may remain undisturbed and, if deemed necessary, the sealing layer may be sealed thereto. The conformation of the sealing layer 1 is carried out by determining the width of the other, planar part lb of the sealing layer. Its width shall be. so large that the dis¬ tance from the upwardly curving edge portion la to the edge portion lc of the part lb that does not curve in an upward direction will be sufficient to eliminate any risk of fire at or inside the upwardly directed surface 2 when the edge portion lc of the part lb is heated and thus sealed to another sealing layer 6.

Having been brought in position adjacent to the up¬ wardly directed surface 2, the sealing layer 1 can be fixed with the aid of fastening means 7. These can be mounted by raising parts of an upper layer 10 of bituminous mate¬ rial from a subjacent metal layer 9 and by passing the fastening means 7 through apertures in the metal layer 9, whereupon the fastening means are secured and the upper layer 10 is replaced. Then, the edge portion 6a of the other sealing layer 6 can be placed on top of the edge por¬ tion lc, whereupon sealing is carried out with the use of appropriate equipment.

If there is a cover metal sheet 8 on the upwardly directed surface 2 the height of the upwardly curving edge portion la is determined in such a manner that, after mounting said edge portion will project some distance in upward direction beneath said cover metal sheet 8. It may be necessary temporarily to bend aside said cover metal sheet in order that the upwardly curving edge portion may be pushed beneath it. Should the angular position of the upwardly curving edge portion la be altered at said bending or at other mounting steps, the correct angle can be resto-

placed side by side and sealed to each other in a suitable manner so that no moisture and no water can penetrate through the joints. The sealing layer 1 illustrated further¬ more facilitates the mounting thereof considerably as com- pared to the state of the art technique, and after mounting the sealing layer can be satisfactorily sealed since also the upwardly curving edge portion la thereof retains its shape and its position.

The above-described structure and shape of the sealing layer 1 may vary within the scope of the appendant claims. Thus, the sealing layer may comprise a number of layers other than two, the metal layer may consist of a squared netting or wire netting, the thickness of the various layers within the sealing layer may vary as required and, if necessary, more than one upwardly curving edge por¬ tion la may be provided.

Claims

Claims :

1. A sealing layer adapted to be shaped with at least one upwardly curving edge portion (la) and to be applied adjacent to an upwardly directed surface (2), with the up¬ wardly curving edge portion (la) located adjacent to said surface, said sealing layer (1) being designed for appli¬ cation to roofs as a covering layer thereon, being mouldable into shape permanence so as permanently to form the upwardly curving edge portion or portions (la) prior to the mounting of the sealing layer (1) and possessing such rigidity that its upwardly curving edge portions (la) retain or substantially retain their shape after the moun¬ ting of the sealing layer (1) adjacent to the upwardly directed surface (2), c h a r a c t e r i s e d in that the sealing layer (1) comprises at least one upper layer (10) of bituminous material, preferably asphalt material, and at least one subjacent metal layer (9) with apertu¬ res (9a) therein, preferably a metal netting, and that bituminous material (10a) from the upper layer (10) en¬ gages the apertures (9a) of the metal layer as a result of the material (10a) from the bituminous layer (10) having been heated and thus caused to melt into the aper¬ tures (9a) of the metal layer (9).

2. A sealing layer as claimed in claim 1, c h a ¬ r a c t e r i s e d in that the sealing layer (1) is adapted to be sealed to another existant sealing layer (5) by heating at least the material (10a) of the upper bitu¬ minous layer (10) which engages the apertures (9a) of the metal layer (9) .

3. A sealing layer as claimed in claim 1, c h a - r a c t e r i s e d in that the bituminous layer (10) of the sealing layer (1) which is situated on top of the metal layer (9) can be partially raised from the metal layer (9) to permit fixation thereof with the aid of fas¬ tening means (7) passing through the apertures (9a) of the metal layer (9), and that the raised portion of the upper layer (10) is then replaced on top of the metal layer (9) so that another sealing layer (6) can be applied over and sealed to the sealing layer (1) by heating.