GB2108546A

GB2108546A - Insulated roof panels

Info

Publication number: GB2108546A
Application number: GB08128371A
Authority: GB
Inventors: Fox
Original assignee: LAMCATEC U K Ltd
Current assignee: LAMCATEC U K Ltd
Priority date: 1981-09-19
Filing date: 1981-09-19
Publication date: 1983-05-18

Abstract

A laminated roof panel having a central foam plastics insulating layer sandwiched between inner and outer metallic sheets (3, 5) so as to form a one piece structural panel. The panel may have a frame (7) which surrounds the insulation layer (1) and is itself sandwiched between and bonded to the inner and outer sheets (3, 5). The inner and outer sheets (3, 5) may be both of the same size and larger than the frame and displaced in opposite directions with respect to the frame (7) so as to form projecting portions (15, 19) on the outer and inner surfaces of the panel. These projecting portions, in use, co-operate with an adjacent panel to form an overlapping water proof joint. <IMAGE>

Description

SPECIFICATION Improvements in or relating to building systems The present invention relates to improvements in building systems and in particular to a roofing system and method of jointing same.

Sectional buildings for use as offices, garages, sheds, agricultural buildings are known but heretofore the roofing used on these buildings has involved several operations namely fixing a covering to form the roof and applying some waterproofing material over it and where the roof is to be insulated subsquently applying insulation to the inner side of the roof covering and covering this with a facing layer. Such a system has the disadvantage that it is extremely time consuming to erect and hence a building roof constructed in this manner is necessarily expensive.

It is an object of the present invention to provide a roofing system particularly for a sectional building, which eliminates this laborious form of construction.

In accordance with the invention there is provided a roofing system comprising one or more panel members the panel members being of laminated construction comprising a sheet of foamed plastics insulation sandwiched between and bonded to inner and outer metallic sheets.

Preferably the panel members are rectangular and the edge regions of the panel are formed by a frame which is sandwiched between and bonded to the inner and outer metallic sheets. Preferably the frame is wooden and preferably all the outer edges of the frame have a rebate formed therein.

In a preferred emodiment the outer metallic sheet extends beyond the edge region along one side of the panel and the inner metallic sheet extends beyond the edge region on that side of the panel opposite to that at which the outer sheet is extended. By means of these extended outer and inner sheets adjacent panels may be easily connected in a waterproof manner. Thus, the extended outer sheet of one panel overlaps onto the outer sheet of an adjacent panel. To provide a mechanical joint between the two panels a tongue is fitted into the respective rebate of adjacent panels.

Sealant is applied to the edge regions df the panels particularly to the extended inner and outer sheets as an added protection against water penetrating the joint.

The invention will now be described further, by way of example only with reference to the accompanying drawings, in which: Figures 1 and 2 are sectional views of two embodiments of a roof panel in accordance with the invention, Figure 3 is a sectional view of an edge region of a panel drawn approximately full scale, Figure 4 illustrates a horizontal panel to panel joint.

Figure 5 illustrates a vertical panel to roof support connection and Figure 6 illustrates a ridge connection.

In the drawings the same reference numerals have been used to indicate corresponding parts. Referring firstly to Figs. 1 and 2 which illustrate to a reduced scale two embodiments of a roof panel for use in a roof system in accordance with the invention. The panel is of laminated construction and comprises a sheet of foamed plastics insulation material 1 sandwiched between an inner and outer metallic sheet 3, 5. A wooden frame 7 extends around the periphery of the insulation material 1 and is likewise sandwiched between the inner and outer metalic sheets 3, 5. The inner and outer sheets 3, 5 are bonded to the central insulation and the wooden frame conveniently the panel is bonded in a vacuum press. The panel member is typically rectangular and the four sides of the wooden frame 7 define a respective edge region for the panel member.

The particular configuration of the edge region depends upon the position of the panel member in the roof system. This wil become more clear with reference to the description of Figs. 4 to 6 below.

Fig. 3 illustrates a section through one of the edge regions of a panel and shows more clearll;;:le frame 7 defining the edge region.

The frame is provided with a rebate 9 the purpose of which is described below with reference to Fig. 4. The inner and outer metallic sheets 3, 5 are illustrated as finishing just short of the edge 11 of the frame and this is to be preferred but is by no means essential and the two sheets 3, 5 may finish flush with the edge 11.

The panel members are intended to be supported at two of their edges on roof trusses and where the span of the roof exceeds the length of the panel, adjacent panels may be joined by means of a tongue 1 3 which engages in the rebate 9 on the frame 7 of the respective panels. Fig. 4 illustrates such a joint. It will be seen that the outer metallic sheet 5 of one panel A overlaps the outer metallic sheets of an adjacent panel B. This is achieved by arranging for the outer metallic sheet 5 of panel A to extend, along one side only, beyond the edge region defined by the frame 7. The projecting portion 1 5 thus overlapping the other panel B so that in use water running down the external surface of panel A passes over the joint and runs down panel B.

As an additional precaution against water penetration into the joint a sealant 1 7 is applied to the projection 1 5 and/or edge of the panel B.

It will be seen also that the inner sheet 3 of the panel B is likewise extended so that it projects beyond the edge region of the panel B and overlaps with the inner sheet 3 of the panel A. A sealant 21 is likewise applied to the projecting portion19 and/or to the inner sheet 3 of panel A to prevent condensation or such like entering the joint. By having both the inner and outer sheets projecting enables standard sized sheets of metal to be used therefore avoiding the need to trim the sheets.

The tongue 1 3 co-operating with the rebates 9 of the respective panels A and B serves to mechanically link the panels. Preferably no mechanical loading is taken by the inner and outer metallic sheets 3, 5 where they overlap with the adjacent panel. The gap 20 between the panels serves on an expansion joint.

Fig. 5 illustrates a ridge connection and it will be seen that no extension of the inner or outer sheets is necessary at this connection.

Thus the upper edge of panels C correspond in shape with right hand edge of the panel illustrated in Fig. 1. If the panel C is not long enough to span the roof itself then it will have an extended outer sheet at its lower edge thus allowing formation of a joint as illustrated in Fig. 4. Closure plates 23, 25 are secured in a position to bridge the upper ends of the two panels C. A sealant 27 is applied to prevent water ingress and insulation 28 is disposed between the closure plates.

Fig. 6 illustrates a section through a vertical panel to panel connection and shows how the edges 31, 33 of adjacent panels D, E are supported on a roof truss 29. A gap 35 between the panels D, E allows for expansion.

It will be seen that the edge regions are flush with no extension of the inner or outer metallic sheets 3, 5, thus the edges of the panels forming the vertical joints of the roof system will have a configuration corresponding in section to that shown in Fig. 3. Because these edges of the panels are supported on the roof trusses it is not necessary to fit a tongue between the panel to co-operate with the rebates in the frame. Thus the rebates are not strictly necessary along these vertical edge regions. A cover strip 37 is fitted over the vertical joint and in conjunction with flexible sealant 39 ensures that the joint remains water tight.

Preferably the tongue 1 3 is plywood and the sealant is a non-setting mastic sealant the thickness of the insulating material is dependent upon the degree of insulation required.

Generally 45 mm or 70 mm thick sheets would be employed. The thickness of the inner and outer metallic sheets may be varied depending upon strength requirements. Typically 0.5 mm thick plastic coated steel sheet would be used. The bonded laminated panel constitutes a one piece structural unit.

Claims

1. A roofing system comprising one or more panel members, the panel members being of laminated construction comprising a sheet of foamed plastics insulation sand wiched between and bonded to inner and outer metallic sheets.

2 A roofing system as claimed in claim 1 in which a frame surrounds the foamed plastics insulation and is sandwiched between and bonded to the inner and outer metallic sheets.

3. A roofing system as claimed in claim 2 in which the panel is rectangular and the frame defines edge regions of the panel.

4. A roofing system as claimed in claim 3 in which the outer metallic sheet extends beyond the frame at least along one edge of the panel.

5. A roofing system as claimed in claim 3 or 4 in which the inner metallic sheet extends beyond the frame at least along one edge of the panel.

6. A roofing system as claimed in claim 5 in which the inner and outer metallic sheets are the same size and are displaced with respect to the frame in opposite directions so that a projecting portion of the outer sheet is disposed on the opposite side of the panel to that side at which a portion of the inner sheet projects.

7. A roofing system as claimed in claim 6 in which the edge of the inner and outer sheets and the edge of the frame of the other two opposite sides of the panel member are substantially flush.

8. A roofing system as claimed in any of claims 2 to 7 in which the panel has a rebate formed in the frame at least along one edge.

9. A roofing system as claimed in claim 8 in which the edge which is rebated corresponds with the edge in which either the outer or the inner sheets is extended.

10. An assembly of at least two panels according to claims 8 or 9 in which two adjacent panels are joined by means of a tongue which co-operates with the rebate formed in the edge of the respective panels.

11. An assembly as claimed in claim 10 .in which the projecting portion of the outer sheet of one panel overlaps the outer sheet of the adjacent panel and the projecting portion of the inner sheet of said adjacent panel overlaps the inner sheet of said one panel.

1 2. An assembly as claimed in claim 11 in which a sealant is disposed between the overlapping portions of the adjacent panels.

1 3. An assembly as claimed in claim 1 2 in which the sealant is a non-setting flexible mastic.

14. A roofing system as claimed in any of claims 2 to 9 in which the frame is wooden.

1 5. A roofing system constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.