ROOF CONSTRUCTION

Abstract: A roof construction, preferably intended to be arranged on a roof of a slight fall and comprising a plurality of supporting plate profiles (1:1') which are put on crossbars (6) or the like, said plate profiles (1:1') being placed in a certain spaced relationship. At roofs having a slight fall, so-called plane roofs, it has so far been impossible in principle to use outer roof covering, as inleakage of water has been a great problem. The invention is characterized in that channeled plates (8) are laid on the supporting plate profiles (1:1') and that a condensate bar in the form of a disc (15) is arranged under each plate (8) at some distance from this, the disc (15) connecting with the plate profiles (1:1').

Description: Roof Construction This invention relates to a roof construction, pre¬ ferably intended to be arranged on a roof of a slight fall, comprising a plurality of supporting plate profiles exten¬ ding in the direction of the roof fall and put up on cross- bars or the like, said plate profiles being placed in a certain spaced relationship. At roofs sloping only a few degrees, so-called plane roofs, the outer roof covering often consists of so-called weatherproof board as it has so far not been possible to use any other type of outer roof covering, e.g. plate, brick, due to the tendency of water to leak in as a con¬ sequence of the slight roof fall. Moreover, plate roofs have been unsuitable due to formation of condensate. It is true that there are special compounds which are applied to the underside of the plate and bind the condensing water. However, this water must be given a possibility of evaporating, which has not always been the case due to lacking ventilation. There is a continuous need of reconditioning the above-mentioned felt roofs, as the used so-called weather¬ proof board has a life of about 10-15 years. Set far the only alternatives at renewal of such roofs with maintained fall have been either to tar the felt or lay new felt on top of the old one. However, only a relatively short life of the reconditioned roof will be obtained in this way. For this reason quite a new superstructure with a greater roof fall has also been made on the roof in certain cases and in doing this it has been possible to use e.g. plate or brick as outer roof covering. However, the last-mentio- ned method is relative expensive as quite a new superstruc¬ ture must b * e made. It is the object of this invention to provide a roof construction with plate as outer roof covering, which can be applied to so-called plane roofs without risking nega- tive consequences at a possible inleakage of water. This object of the invention is realized by means of a roof construction which has been given the characte¬ ristic features set forth in the annexed claims. An illust¬ rative example of the invention will be described below with reference to the enclosed drawing, in which a perspec¬ tive view of part of a roof construction according to the invention is shown schematically. The roof construction shown in the Fig. comprises supporting plate profiles 1, which have an upper flange 2, two mantles 3 extending outwards and downwardly from this 1 0 flange and at their lower ends passing on to outwardly directed lower flanges 4 having an upwardly bent free edge 5. These plate profiles 1 are put up on supporting mem¬ bers 6 e.g. in the form of crossbars, light elements or 15 the like, which extend transversely of the longitudinal direction of the plate profiles 1. The plate profiles 1 are anchored in the supporting members 6 via the lower flanges 4 by means of attachment 7, which may consist of e.g. screws or nails. 20 The suitable centre/centre distance between the sup¬ porting members 6 is decided by the span that the plate profiles 1 can bridge, which is in turn dependent on the height, stiffening and plate thickness of the mantles 3. The outer roof covering consists of channeled roofing * -*- ■ sheets 8 which at their longitudinal lateral edges arc provided with edge portions 9 overlapping each other at adjacent plates 8. The edge portions 9 have a connecting part 11 which preferably is plane and upwardly bent from the channeled 30 portion 10. A means of attachment 12 extending parallely to the main plane of the roof is connected to the connecting mem¬ ber 11, the edge portion 9 terminating in an edge part 13 downwardly bent relative to the means of attachment 12. ^ $ As is apparent from the Figure the means of attach¬ ment 12 is attached to the upper flange 2 of the plate profile 1 , this attaching being effected by suitable attaching means 14, e.g. plate screws. As two edge portions 9 overlap each other above the plate profile 1 the attaching means 14 pass through two means of attachment 12 and also the upper flange 2 of the plate profile 1. Under the roofing plate 8 a condensate trap is arranged in the form of a disc 15, preferably a hard fiberboard (MASONITE * ) . As is apparent from the Figure the disc 15 is arranged in a certain spaced rela¬ tionship from the roofing plate 8, an air gap 16 being formed between the plate 8 and the disc 15. Attachment of the longitudinal edges of the disc 15 to the mantle 3 of the plate profile is carried out by means of hook-shaped elements 17, which are adapted to the mantles 3 through fastening means 18. It can be said that the disc 15 is clamped between the plate profiles 1, the distance between the elements 17 at opposed longitudi¬ nal edges of a disc 15 being less than the width of the disc 15 in unactuated state. By a suitable adaptation of the vertical placement of the elements 17 on the mantles 3 and the distance between the plate profiles 1 the disc 15 will be given a downwardly bulged form which substan¬ tially agrees with the downward bulge of the roofing plate 8, the disc 15 and the channeled portion 10 of the plate 8 being substantially parallel. As is apparent from the Figure a board 19 is arran- ged in the region of its lowermost point, which board in the illustrative example shown is recessed in the suppor¬ ting member 6. The board 19 thus extends parallely to the plate profiles 1. The purpose of the board 19 is to serve as anchoring member of the centre portion of the disc 15. The air gap 16 has the effect that the plate 8 be¬ comes ventilated on its underside, which is extraordinari¬ ly advantageous when it is about taking charge of the pos¬ sible condensation water formed on the underside of the plate 8. If condensate is formed to such an extent that ven¬ ting in the air gap is insufficient to eliminate the condensation water such water possibly falling down from the plate will be collected on the disc 15 and carried in the direction of the roof fall to an external or internal surface water sewer. The build-up of the surface construction according to the invention ensures to an extraordinarily high degree that no inleakage of water takes place. As already described above condensation water possib¬ ly dropping down from the roofing plate 8 is taken charge of by the disc 15. This disc 15 also takes charge of water leaking through the roofing plate 8 on account of some da¬ mage, e.g. holes or cracks in the plate 8. If it should happen that water leaks down between the longitudinal edges of the disc 15 and the hook shaped ele¬ ment 17 or between this and the mantle 3 of the plate pro- file 1 this water is taken charge of by the channel 4 and is carried away to a gutter or the like. As pointed out above the roof construction according to the invention is especially suitable for so-called plane roofs, i.e. with a roof fall of only a few degrees. Usual- ly such roofs slope inwardly and are consequently provided with so-called interior sewers which are hidden inside the building. By the channel form of the roofing plate 8 rain water will automatically find its way due to " the influence of gravity towards the lowermost point of the channel, the risk of inleakage of water in the overlapping joints, e.g. by the capillary force, in principle being eliminated. Thus, double folding in the joints is avoided and usual overlapping is sufficient. As is apparent from Fig 2 bent transversal profile members 20 can be arranged instead of the longitudinal board 19, which members support the board 15 between the crossbars 6 ■ . Thus, the profile element 20 is anchored with its ends to the plate profiles I 1 , which are different from the plate profiles I according to Fig. 1 through the longi¬ tudinal grooves 21 arranged in the lower flanges 4'. The anchorage of a profile clement 21 to the plate pro iles 1 ' is made in that downwardly extending tongues 22 of the profile element 20 are placed in the groove 23 formed between the mantles 3' of the plate profiles 1' and the groove 21. A downwardly directed tongue 24 of the pro¬ file element 20 is thereafter anchored, e.g. by means of a screw 25, in the mantle 3* of the profile 1 1 . In this way the ends of the profile element 20 are fixed to the plate profiles 1 ' . Thus, with the roof construction of the present in¬ vention an extraordinarily tight roof covering is obtained and if water should still leak in, e.g. on account of da¬ mage, the leaking water is taken charge of and led to sewage, underlying parts of the roof construction being protected. It is possible within the scope of the invention to replace the board 15 by a plate, which is applied in a way corresponding to the disc. The invention can also be freely varied in other res¬ pects within the scope of the following claims.

Claims: -*- PATENT CLAIMS 1. Roof construction, preferably intended to be arranged on a roof of a slight fall, comprising a plurali- ty of supporting plate profiles (1:1*) which are put up on crossbars (1) or the like, said plate profiles (1:1') being placed in a certain spaced relationship, c h a r a c t e ¬ r i z e d in that an outer roof covering in the form of channeled plates (8) extending in the direction of the roof fall (15) put up with the edge portions (9) on the suppor¬ ting plate profiles (1:1) and that a condensate trap in the form of a disc-shaped member (15) is arranged under each plate (8) at some distance from this, the disc-shaped mem¬ bers (15) connecting with the supporting plate profiles C1:T). 2. Construction as claimed in claim 1, c h a r a c - t e r i z e d in that the edge portions (9) of the roofing plates (8) overlap each other at the plate profiles (1:1'). 3. Construction as claimed in claim 1 or 2, c h a - r a c t e r i z e d in that the edge portions of the plates (8) are raised, when the plates are mounted, relative to the channeled portions (10) of the plates (8). 4. Construction as claimed in " any of the preceding claims, c h a r a c t e r i z e d in that the disc-shaped members (15) are clamped between the supporting plate pro¬ files (1:1') by means of hook-shaped members (17) which are attached to said plate profiles (1:1'). 5. Construction as claimed in any of the preceding claims, c h a r a c t e r i z e d in that the supporting plate profiles (1:1') have channeled lower flanges (4:4'). 6. Construction as claimed in any of the preceding claims, c h a r a c t e r i z e d in that the supporting plate profiles (1:1') have a trapezoidal cross section. 7. Construction as claimed in any of the preceding claims, c h a r a c t e r i z e d in that the disc-shaped member (15) is supported between the crossbars (6) by spe¬ cial profile elements (20) extending transversely of plate profiles (1'), the ends of said elements being supported by the plate profiles (1').

Inventors: WIKLUND PER, WIKLUND, PER
Applicants: WIKLUND PER, WIKLUND, PER
Application year: 1985
Main classification: E04D13
IPC codes: E04B7, E04D3