Title:
COPING AND FASCIA TRIM
United States Patent 3668811
Abstract:
Coping and fascia trim for the edge of a building structure is comprised of a pair of elongated interconnectable trim strips each having a continuous anchor flange securable to the roof and a skirt depending to overlie the building facade. The strips are interconnected by a tongue and stirrup at the skirt edges and are dimensioned to provide spacing between the anchor flanges for a roofing layer. Optionally the trim may accommodate fascia insulating board between the skirts and roof insulation board between the anchor flanges.
US Patent References:
Fire venting roof structure
Wasserman - January 1962 - 3017721
POURED GYPSUM ROOF STRUCTURE WITH LOWER VENT MEANS FOR REMOVING EXCESS MOISTURE
Seaburg - March 1970 - 3498015
FASCIA AND FLASHING CONSTRUCTION
Tyler - October 1970 - 3533201
Building structures
Trostle - October 1958 - 2857861
Sheet-metal house
Pryden - February 1922 - 1406757
Fire venting roof structure
Wasserman - January 1962 - 3017721
POURED GYPSUM ROOF STRUCTURE WITH LOWER VENT MEANS FOR REMOVING EXCESS MOISTURE
Seaburg - March 1970 - 3498015
FASCIA AND FLASHING CONSTRUCTION
Tyler - October 1970 - 3533201
Building structures
Trostle - October 1958 - 2857861
Sheet-metal house
Pryden - February 1922 - 1406757
Application Number:
05/026842
Publication Date:
06/13/1972
Filing Date:
04/09/1970
View Patent Images:
Export Citation:
Primary Class:
Other Classes:
52/60, 52/96
International Classes:
E04D13/15; E04D13/15
Field of Search:
52/60,94,95,96
US Patent References:
Primary Examiner:
Abbott, Frank L.
Assistant Examiner:
Raduazo, Henry E.
Claims:
What I claim is
1. Coping and fascia trim in combination with the roof edge of a building comprising:
2. The combination as claimed in claim 1 wherein:
3. The combination as claimed in claim 1 wherein:
4. The combination as claimed in claim 1 wherein:
5. The combination as claimed in claim 1 wherein:
6. The combination as claimed in claim 5 wherein:
7. The combination as claimed in claim 5 wherein:
8. The combination as claimed in claim 1 wherein:
9. The combination as claimed in claim 8 wherein:
10. The combination as claimed in claim 1 wherein:
11. The combination as claimed in claim 10 wherein:
12. The combination as claimed in claim 11 wherein:
1. Coping and fascia trim in combination with the roof edge of a building comprising:
2. The combination as claimed in claim 1 wherein:
3. The combination as claimed in claim 1 wherein:
4. The combination as claimed in claim 1 wherein:
5. The combination as claimed in claim 1 wherein:
6. The combination as claimed in claim 5 wherein:
7. The combination as claimed in claim 5 wherein:
8. The combination as claimed in claim 1 wherein:
9. The combination as claimed in claim 8 wherein:
10. The combination as claimed in claim 1 wherein:
11. The combination as claimed in claim 10 wherein:
12. The combination as claimed in claim 11 wherein:
Description:
This invention relates to coping and fascia trim for use on a roof in a building structure and the invention particularly contemplates such a trim for use in a flat-roofed building.
Known forms of flat-roofed building structure include the provision of one or more layers of roof material located over a roof deck wherein it is necessary that such roof material be securely anchored in position to prevent lift-off under high wind conditions for example. Evidently occurrence of such lift-off is likely to commence around the edges of the roof material, which generally extends to the edge of the roof itself, and it is therefore a broad object of the invention to provide trim which is anchorable to the roof and which will also function to anchor roof material in position on the roof.
It is a further object of the invention to provide trim comprising two separate coping and fascia strips anchorable to the roof, interconnectable together, and relatively proportioned to provide accommodation therebetween for roof material to be anchored in position on the roof.
Such trim besides anchoring the roof material in position on the roof may conveniently also function to provide a facing depending from the roof edge for insulating and/or decorative purposes.
Accordingly it is a yet further object to provide trim anchorable to the roof and having facing depending integrally therefrom locatable at the roof edge generally to overlie the facade of the building structure adjacent said roof edge.
In accordance with the present invention the instant trim comprises fascia and coping strips each having roof anchor portions securable to the roof and skirts respectively integrally depending from said portions; said strips being interconnectable together in superposed relation by their skirts and relatively dimensioned to provide spacing between the roof anchor portions for accommodating roof material therebetween.
Other features of the invention more or less broad than the foregoing will become apparent from the hereinafter following description of the parts, principles and elements thereof given herein solely by way of example with reference to the accompanying drawings wherein like reference numerals refer to like parts throughout the several views and wherein:
FIG. 1 is a perspective view of a pair of fascia and coping strips comprising the instant trim, the strips being shown in superposed relation prior to their interconnection together;
FIG. 2 is an end cross-sectional view of the trim of FIG. 1 assembled on a roof edge;
FIG. 3 is a perspective view similar to FIG. 1 showing part of an alternative construction of trim adapted to accommodate a fascia board;
FIG. 4 is an end cross-sectional view of the trim of FIG. 3 assembled on a roof edge and
FIG. 5 is an end cross-sectional view of another alternative construction of the instant trim assembled on a roof edge.
The instant trim is intended for use on a roof of a building structure and, as illustrated herein, the structure particularly contemplated is one having a flat horizontal roof with a vertical facade thereto.
In accordance with the principles of the present invention the instant trim comprises an assembly of coping and fascia strips 10 and 12 respectively superposable relative to one another, interconnectable together and anchorable on a roof to anchor roof material in position upon the roof. Each said coping and fascia strip comprises a roof anchor portion anchorable to the roof and a skirt depending integrally therefrom which, in the embodiments described and illustrated herein, depends over the edge of the roof to overlie the facade of the building structure. In order to provide accommodation for roof material between the respective roof anchor portions, the coping and fascia strips are relatively proportioned to provide spacing, when they are interconnected, between the roof anchor portions thereof. The interconnection between the two strips conveniently takes the form of a tongue and stirrup interconnection conveniently provided at or adjacent to the free edges of the skirts remote from their junctures with their respective roof anchor portions.
A first embodiment of the instant trim will now be more particularly described with respect to FIGS. 1 and 2 of the drawings. As illustrated therein the trim comprising elongated coping and fascia strips 10 and 12 respectively is located at the peripheral edge of a flat roof to overlie the roof and the facade of the structure adjacent the roof edge.
The actual building structure may of course be of any convenient form and for the sake of convenience herein is illustrated as including a vertical wall 14 with an uninsulated roof deck 16 thereon, said deck 16 being overlaid with a layer of roof material 18 covering the whole of the roof area and completed by a peripheral edge strip-in 20. Such roof layer 18 and strip-in 20 may both for example comprise roofing felt with a bituminous material painted or poured thereon and top-dressed with gravel 22 in known manner.
The said strips 10-12 comprise respective roof anchor portions 24-26 securable to the roof and respective skirts 28-30 depending integrally therefrom which, in this embodiment, overlie the facade of the wall 14. The strips 10-12 are superposed relative to one another with the coping strip 10 having its roof anchor portion 24 and skirt 28 closely adjacent the roof and wall respectively and being respectively overlaid by the roof anchor portion 26 and skirt 30 of the fascia strip 12. The roof anchor portions 24-26 and skirts 28-30 are planar and extend continuously in the direction of the length of the strip.
As hereinbefore mentioned the strips 10-12 are interconnected together and this is conveniently accomplished at the edges of the respective skirts 28-30 remote from their junctures with their respective roof anchor portions 24-26. Such interconnection takes the form of a tongue 32 and stirrup 34 and in the embodiment illustrated herein such stirrup 34 is provided on the coping strip skirt 28 while the tongue 32 is provided on the fascia strip skirt 30. The strips 10-12 are so relatively proportioned that, when the tongue 32 is engaged within the stirrup 34 to interconnect the strips as shown in FIG. 2, spacing is afforded between the roof anchor portions 24-26 providing accommodation for the edge of roof material, specifically herein the layer 18.
As will be appreciated the coping strip 10 is first applied to the roof edge to overlie the roof deck 16 and wall 14 after which the roof material 18 is located in position and the trim is completed by the interconnection of the fascia strip 12 to the coping strip 10; the respective roof anchor portions 24-26 being secured to the roof by suitable fasteners such as the screw 36 illustrated in FIG. 2. Such an assembly not only anchors the edges of the roof material 18 to the roof 16, thereby obviating wind lift-off, but also provides a neat appearance to the facade of the wall 14 adjacent the roof edge.
It will be seen that the fascia strip skirt 30 constitutes the outer surface of the assembled trim overlying the wall facade and is retained in position by the tongue and stirrup interconnection 32-34. That is to say, only the fasteners 36 may serve to hold and secure the trim in position on the roof edge, the said interconnection 32-34 serving to retain the fascia strip skirt 30 in position and restrain it against wind lift-off away from the wall facade. However if the skirts 28-30 are of substantial width, i.e., in excess of approximately 4 inches, it is deemed desirable to positively secure the skirts to the wall 14 such as by additional fasteners as illustrated herein in FIG. 2 by the screws 38. In such an arrangement the fascia strip skirt 30 conceals such fasteners 38 from sight while at the same time maintaining an uncluttered exterior appearance on the wall facade.
It will be observed from the FIGS. 1 and 2 illustrations that the coping and fascia strips 10-12 are both contoured at the respective junctures between their roof anchor portions 24-26 and skirts 28-30 to provide, on each strip, upstanding abutments 40 and 42 respectively which are in fact continuations of the skirts 28-30 beyond the respective planes of the roof anchor portions 24-26.
As has been mentioned hereinbefore the roof material 18 may be in the form of a roofing felt over which a bituminous composition is poured or painted to impregnate the felt therewith. The edges of such a roofing felt would be applied over the roof anchor portion 24 of the coping strip 10 before the fascia strip 12 is interconnected thereto and there is therefore a danger that the poured or painted bituminous material, when applied to the roofing felt, may splash or drip over the roof edge. Hence the coping strip 10 is provided with the abutment 40 locatable at the roof edge to act as a dam preventing any accidental spillage of bitumen over the said roof edge. Also of course after the roof has been completed, prolonged exposure to the sun may at least partially liquify the bituminous material on the roof causing it to tend to run and said coping strip abutment 40 would also prevent any such running of said material over the roof edge.
Similarly the abutment 42 on the fascia strip 12 will act to dam any bitumen spillage which may tend to occur from the striping layer 20. In addition however such fascia strip abutment 42 serves as a gravel stop to prevent any gravel chips 22, which may become loosened from their embedment within the bituminized roof material 18 or 20, from being dislodged over the roof edge. Furthermore such fascia strip abutment 42 will act as a rainwater dam to prevent rainwater from spilling over the roof edge and to retain it within the confines of the roof for appropriate interior drainage.
It should be understood that the provision of a facing, i.e., the skirts 28-30 of the instant trim, overlying the facade of the building structure may serve several purposes, amongst these being insulation and/or decoration of the facade. The embodiment illustrated in FIGS. 1 and 2 primarily serves only as decoration to give a neat uncluttered finish to the facade adjacent the roof edge but it may also be adapted to deflect rainwater away from the facade in an attempt to minimize water marking or staining thereof. This effect is achieved in the present embodiment by providing a projecting lip 44 on the fascia strip skirt 30 which, when the trim is assembled in position, extends away from and downwardly of the wall facade to deflect rainwater running down the exterior surface of the skirt 30 away from the wall 14.
It will be appreciated that the instant trim may be formed of a relatively thin metal and the formation of the rainwater deflector lip 44 is therefore easily accomplished. Likewise the appropriate contourings of the strips 10-12 to provide the aforesaid abutments 40 and 42 together with the provision of the stirrup 34 accommodating the tongue 32 of the interconnection between the strips is equally easily accomplished by a suitable forming operation.
Turning now to the alternative structure of trim as illustrated herein in FIGS. 3 and 4, it will be observed that the coping and fascia strips 10-12 are relatively proportioned not only to provide accommodation for roof material but also to accommodate fascia board 46 between the skirts 28-30.
As has been mentioned hereinbefore the skirts 28-30 which together form a facing overlying the facade of the building structure may contribute to insulation purposes as well as to decoration. The embodiment of trim illustrated in FIGS. 3 and 4 is adapted to serve this insulation purpose by the accommodation of the aforesaid fascia board 46 which will function to insulate the wall adjacent the roof edge.
The building structure illustrated in FIG. 4 is somewhat different to that shown in FIG. 2 inasmuch that roof insulation board 48 is superposed on the roof decking 16 before the roof material 18-20 is applied thereto; said board 48 together with said roof material 18-20 having its edges accommodated by said trim and anchored to the roof thereby in a similar manner to that hereinbefore described with reference to the FIGS. 1 and 2 embodiment. The coping and fascia strips 10-12 are again interconnected by means of a tongue and stirrup interconnection 32-34 provided at the edges of the respective skirts 28-30 remote from their junctures with the respective roof anchor portions 24-26 but in this embodiment the stirrup 34 of such interconnection is dimensioned to receive not only the tongue 32 thereof but also to receive an appropriate insulating fascia board 46 which is conveniently of the rectangular cross-sectional form illustrated in FIGS. 3 and 4 and which may be formed of the same material as the roof insulating board 48.
It will be appreciated that in this embodiment, the actual means of securing the trim to the roof, and if required to the wall also, may be the same as hereinbefore described with reference to the FIGS. 1 and 2 embodiment. Similarly the respective abutments 40-42 of the coping and fascia strips 10-12 at the roof edge together with the rainwater deflector 44 may also be of the same general form as described with reference to FIGS. 1 and 2.
Turning now to the further alternative construction of trim illustrated in FIG. 5 of the drawings, it will be observed that whereas the coping strip 10 is of substantially the same form as that illustrated in FIGS. 3 and 4, the fascia strip 12 is further contoured between its skirt 30 and roof anchor portion 26 to provide an inclined support 50 for the strip-in roof material 20 and function as an integral cant strip, as well as to function as a rainwater dam and gravel stop as hereinbefore described.
Before discussing the specific structure of the FIG. 5 embodiment in more detail, it should first of all be observed that the building structure contemplated herein is similar to that illustrated in the FIGS. 3 and 4 embodiment including a roof decking 16 overlaid by insulating board 48 and completed by further roof material in the form of one full layer 18 and a strip-in 22. Furthermore the coping and fascia strips 10-12 are relatively proportioned to accommodate the roof insulating board 48 and a layer 18 of roof material therebetween and anchor them to the roof as well as to accommodate insulating fascia board 46 between the respective skirts 28-30 of the trim, said fascia board 46 being received within the stirrup 34 of the tongue and stirrup interconnection between the coping and fascia strips. Likewise the actual means of securing the trim to the roof, and if required to the wall also, may be the same as hereinbefore described with respect to either of the two preceding embodiments and the rainwater deflector lip 44 on the fascia strip skirt 30 may also be the same as hereinbefore described.
It will be observed from FIG. 5 that the fascia strip 12 is proportioned relative to the coping strip 10 to provide accommodation between the two respective skirts for insulating fascia board 46 which extends above the surface of the roof thereby to provide an improved insulation to the roof in the vicinity of the wall to roof joint. Such fascia strip 12 is contoured not only to provide an abutment 42 at its upper edge to serve as a gravel stop and dam as hereinbefore described but also to be inclined from said abutment 42 to its roof anchor portion 26 to provide an integral cant strip for the edge trim assembly.
Provision of insulating fascia extending above the roof top level is not in itself new and in known constructions such a roof edge assembly has generally been completed by the addition of a cant strip of wedge-shape cross-sectional form to act as a filler between the fascia and the top surface of the roof and functioning also as support for a strip-in layer of roof material. However, such known cant strips are generally formed of wood and in any event have been separate from the fascia itself so that the instant fascia strip 12 contemplated by the FIG. 5 embodiment provides several advantages over the prior art inasmuch that it is an integral part of the trim assembly while at the same time it provides support for the strip-in layer 20 in known manner.
It may also be mentioned herein that certain problems of pressurization may occur in such roof structures of the type illustrated herein particularly in connection with the insulated type of roof structure as shown in FIGS. 4 and 5. It is known for example that it is a common property of building structures that pressurization tends to build up under the roof decking and subsequently within any roof insulation board which may be superposed upon the decking. If no means are provided to relieve such pressurization, the air pressure build up within the insulation board will break out where it can, generally between the upper surface of the insulation board and the layer of roofing felt, thereby causing ridging or bubbling in said roofing felt with a consequent tendency to run-off of the bituminous material with which it is coated hence causing failure of the roof as a whole. Furthermore, since said roof insulation boards are generally laid side by side in abutting relation on the roof deck, relief of the pressurization may tend to occur at such abutting joints causing ridging in the roofing felt with attendant danger of complete failure.
Venting of such pressurization within roof insulation board may easily be accomplished in the trim of the present invention by perforating the coping strip abutment 40 at positions adjacent the edge of the roof insulation board 48 whereby the air pressure may be vented to atmosphere between the coping strip skirt 28 and the facade of the building structure. Such perforation is indicated by the reference numeral 52 in FIGS. 3 and 4 of the drawings. Alternatively, if no perforations are provided in the coping strip, venting of the pressurization in the insulation board may be accomplished between the abutting ends of adjacent coping strips which are normally in lengths of approximately 10 feet secured in edge to edge relation around the periphery of a roof edge.
A further known problem is that roof decking, particularly if it includes concrete, is liable to have a high moisture content which may tend to pass into any roof insulation board laid thereupon. Since the roofing material laid over the roof insulation board is of a bituminized felt material impervious to water, condensation will tend to occur on the under surface of such roof layer with consequent moisture saturation of the roof insulation board and attendant failure of its insulating properties. It is therefore desirable to insert a vapor barrier, which may conveniently be polythene sheeting, to cover the entire under surface of the roof insulation board above the roof decking substantially in the manner shown by the sheet 54 in FIG. 5 of the drawings. Provision of such a water impervious vapor barrier 54 thereby contains the moisture within the roof decking 16 and prevents any moisture penetration from reaching the roof insulating board 48. It will be appreciated that in the provision of the vapor barrier 54 as shown in FIG. 5 it will be necessary also to perforate such barrier, preferably at the position where it lies between the edges of the roof insulation board 48 and the coping strip abutment 40, to vent any pressurization which may tend to build up in the insulation board in the manner aforesaid.
Thus the instant trim comprised of two superposed strips offers several advantages over known forms of edge trim as hereinbefore mentioned and, since the instant trim is conveniently formed of thin metal sections, which require no further finishing, complete elimination of any wooden cant strips or fascias or soffits is procured.
Known forms of flat-roofed building structure include the provision of one or more layers of roof material located over a roof deck wherein it is necessary that such roof material be securely anchored in position to prevent lift-off under high wind conditions for example. Evidently occurrence of such lift-off is likely to commence around the edges of the roof material, which generally extends to the edge of the roof itself, and it is therefore a broad object of the invention to provide trim which is anchorable to the roof and which will also function to anchor roof material in position on the roof.
It is a further object of the invention to provide trim comprising two separate coping and fascia strips anchorable to the roof, interconnectable together, and relatively proportioned to provide accommodation therebetween for roof material to be anchored in position on the roof.
Such trim besides anchoring the roof material in position on the roof may conveniently also function to provide a facing depending from the roof edge for insulating and/or decorative purposes.
Accordingly it is a yet further object to provide trim anchorable to the roof and having facing depending integrally therefrom locatable at the roof edge generally to overlie the facade of the building structure adjacent said roof edge.
In accordance with the present invention the instant trim comprises fascia and coping strips each having roof anchor portions securable to the roof and skirts respectively integrally depending from said portions; said strips being interconnectable together in superposed relation by their skirts and relatively dimensioned to provide spacing between the roof anchor portions for accommodating roof material therebetween.
Other features of the invention more or less broad than the foregoing will become apparent from the hereinafter following description of the parts, principles and elements thereof given herein solely by way of example with reference to the accompanying drawings wherein like reference numerals refer to like parts throughout the several views and wherein:
FIG. 1 is a perspective view of a pair of fascia and coping strips comprising the instant trim, the strips being shown in superposed relation prior to their interconnection together;
FIG. 2 is an end cross-sectional view of the trim of FIG. 1 assembled on a roof edge;
FIG. 3 is a perspective view similar to FIG. 1 showing part of an alternative construction of trim adapted to accommodate a fascia board;
FIG. 4 is an end cross-sectional view of the trim of FIG. 3 assembled on a roof edge and
FIG. 5 is an end cross-sectional view of another alternative construction of the instant trim assembled on a roof edge.
The instant trim is intended for use on a roof of a building structure and, as illustrated herein, the structure particularly contemplated is one having a flat horizontal roof with a vertical facade thereto.
In accordance with the principles of the present invention the instant trim comprises an assembly of coping and fascia strips 10 and 12 respectively superposable relative to one another, interconnectable together and anchorable on a roof to anchor roof material in position upon the roof. Each said coping and fascia strip comprises a roof anchor portion anchorable to the roof and a skirt depending integrally therefrom which, in the embodiments described and illustrated herein, depends over the edge of the roof to overlie the facade of the building structure. In order to provide accommodation for roof material between the respective roof anchor portions, the coping and fascia strips are relatively proportioned to provide spacing, when they are interconnected, between the roof anchor portions thereof. The interconnection between the two strips conveniently takes the form of a tongue and stirrup interconnection conveniently provided at or adjacent to the free edges of the skirts remote from their junctures with their respective roof anchor portions.
A first embodiment of the instant trim will now be more particularly described with respect to FIGS. 1 and 2 of the drawings. As illustrated therein the trim comprising elongated coping and fascia strips 10 and 12 respectively is located at the peripheral edge of a flat roof to overlie the roof and the facade of the structure adjacent the roof edge.
The actual building structure may of course be of any convenient form and for the sake of convenience herein is illustrated as including a vertical wall 14 with an uninsulated roof deck 16 thereon, said deck 16 being overlaid with a layer of roof material 18 covering the whole of the roof area and completed by a peripheral edge strip-in 20. Such roof layer 18 and strip-in 20 may both for example comprise roofing felt with a bituminous material painted or poured thereon and top-dressed with gravel 22 in known manner.
The said strips 10-12 comprise respective roof anchor portions 24-26 securable to the roof and respective skirts 28-30 depending integrally therefrom which, in this embodiment, overlie the facade of the wall 14. The strips 10-12 are superposed relative to one another with the coping strip 10 having its roof anchor portion 24 and skirt 28 closely adjacent the roof and wall respectively and being respectively overlaid by the roof anchor portion 26 and skirt 30 of the fascia strip 12. The roof anchor portions 24-26 and skirts 28-30 are planar and extend continuously in the direction of the length of the strip.
As hereinbefore mentioned the strips 10-12 are interconnected together and this is conveniently accomplished at the edges of the respective skirts 28-30 remote from their junctures with their respective roof anchor portions 24-26. Such interconnection takes the form of a tongue 32 and stirrup 34 and in the embodiment illustrated herein such stirrup 34 is provided on the coping strip skirt 28 while the tongue 32 is provided on the fascia strip skirt 30. The strips 10-12 are so relatively proportioned that, when the tongue 32 is engaged within the stirrup 34 to interconnect the strips as shown in FIG. 2, spacing is afforded between the roof anchor portions 24-26 providing accommodation for the edge of roof material, specifically herein the layer 18.
As will be appreciated the coping strip 10 is first applied to the roof edge to overlie the roof deck 16 and wall 14 after which the roof material 18 is located in position and the trim is completed by the interconnection of the fascia strip 12 to the coping strip 10; the respective roof anchor portions 24-26 being secured to the roof by suitable fasteners such as the screw 36 illustrated in FIG. 2. Such an assembly not only anchors the edges of the roof material 18 to the roof 16, thereby obviating wind lift-off, but also provides a neat appearance to the facade of the wall 14 adjacent the roof edge.
It will be seen that the fascia strip skirt 30 constitutes the outer surface of the assembled trim overlying the wall facade and is retained in position by the tongue and stirrup interconnection 32-34. That is to say, only the fasteners 36 may serve to hold and secure the trim in position on the roof edge, the said interconnection 32-34 serving to retain the fascia strip skirt 30 in position and restrain it against wind lift-off away from the wall facade. However if the skirts 28-30 are of substantial width, i.e., in excess of approximately 4 inches, it is deemed desirable to positively secure the skirts to the wall 14 such as by additional fasteners as illustrated herein in FIG. 2 by the screws 38. In such an arrangement the fascia strip skirt 30 conceals such fasteners 38 from sight while at the same time maintaining an uncluttered exterior appearance on the wall facade.
It will be observed from the FIGS. 1 and 2 illustrations that the coping and fascia strips 10-12 are both contoured at the respective junctures between their roof anchor portions 24-26 and skirts 28-30 to provide, on each strip, upstanding abutments 40 and 42 respectively which are in fact continuations of the skirts 28-30 beyond the respective planes of the roof anchor portions 24-26.
As has been mentioned hereinbefore the roof material 18 may be in the form of a roofing felt over which a bituminous composition is poured or painted to impregnate the felt therewith. The edges of such a roofing felt would be applied over the roof anchor portion 24 of the coping strip 10 before the fascia strip 12 is interconnected thereto and there is therefore a danger that the poured or painted bituminous material, when applied to the roofing felt, may splash or drip over the roof edge. Hence the coping strip 10 is provided with the abutment 40 locatable at the roof edge to act as a dam preventing any accidental spillage of bitumen over the said roof edge. Also of course after the roof has been completed, prolonged exposure to the sun may at least partially liquify the bituminous material on the roof causing it to tend to run and said coping strip abutment 40 would also prevent any such running of said material over the roof edge.
Similarly the abutment 42 on the fascia strip 12 will act to dam any bitumen spillage which may tend to occur from the striping layer 20. In addition however such fascia strip abutment 42 serves as a gravel stop to prevent any gravel chips 22, which may become loosened from their embedment within the bituminized roof material 18 or 20, from being dislodged over the roof edge. Furthermore such fascia strip abutment 42 will act as a rainwater dam to prevent rainwater from spilling over the roof edge and to retain it within the confines of the roof for appropriate interior drainage.
It should be understood that the provision of a facing, i.e., the skirts 28-30 of the instant trim, overlying the facade of the building structure may serve several purposes, amongst these being insulation and/or decoration of the facade. The embodiment illustrated in FIGS. 1 and 2 primarily serves only as decoration to give a neat uncluttered finish to the facade adjacent the roof edge but it may also be adapted to deflect rainwater away from the facade in an attempt to minimize water marking or staining thereof. This effect is achieved in the present embodiment by providing a projecting lip 44 on the fascia strip skirt 30 which, when the trim is assembled in position, extends away from and downwardly of the wall facade to deflect rainwater running down the exterior surface of the skirt 30 away from the wall 14.
It will be appreciated that the instant trim may be formed of a relatively thin metal and the formation of the rainwater deflector lip 44 is therefore easily accomplished. Likewise the appropriate contourings of the strips 10-12 to provide the aforesaid abutments 40 and 42 together with the provision of the stirrup 34 accommodating the tongue 32 of the interconnection between the strips is equally easily accomplished by a suitable forming operation.
Turning now to the alternative structure of trim as illustrated herein in FIGS. 3 and 4, it will be observed that the coping and fascia strips 10-12 are relatively proportioned not only to provide accommodation for roof material but also to accommodate fascia board 46 between the skirts 28-30.
As has been mentioned hereinbefore the skirts 28-30 which together form a facing overlying the facade of the building structure may contribute to insulation purposes as well as to decoration. The embodiment of trim illustrated in FIGS. 3 and 4 is adapted to serve this insulation purpose by the accommodation of the aforesaid fascia board 46 which will function to insulate the wall adjacent the roof edge.
The building structure illustrated in FIG. 4 is somewhat different to that shown in FIG. 2 inasmuch that roof insulation board 48 is superposed on the roof decking 16 before the roof material 18-20 is applied thereto; said board 48 together with said roof material 18-20 having its edges accommodated by said trim and anchored to the roof thereby in a similar manner to that hereinbefore described with reference to the FIGS. 1 and 2 embodiment. The coping and fascia strips 10-12 are again interconnected by means of a tongue and stirrup interconnection 32-34 provided at the edges of the respective skirts 28-30 remote from their junctures with the respective roof anchor portions 24-26 but in this embodiment the stirrup 34 of such interconnection is dimensioned to receive not only the tongue 32 thereof but also to receive an appropriate insulating fascia board 46 which is conveniently of the rectangular cross-sectional form illustrated in FIGS. 3 and 4 and which may be formed of the same material as the roof insulating board 48.
It will be appreciated that in this embodiment, the actual means of securing the trim to the roof, and if required to the wall also, may be the same as hereinbefore described with reference to the FIGS. 1 and 2 embodiment. Similarly the respective abutments 40-42 of the coping and fascia strips 10-12 at the roof edge together with the rainwater deflector 44 may also be of the same general form as described with reference to FIGS. 1 and 2.
Turning now to the further alternative construction of trim illustrated in FIG. 5 of the drawings, it will be observed that whereas the coping strip 10 is of substantially the same form as that illustrated in FIGS. 3 and 4, the fascia strip 12 is further contoured between its skirt 30 and roof anchor portion 26 to provide an inclined support 50 for the strip-in roof material 20 and function as an integral cant strip, as well as to function as a rainwater dam and gravel stop as hereinbefore described.
Before discussing the specific structure of the FIG. 5 embodiment in more detail, it should first of all be observed that the building structure contemplated herein is similar to that illustrated in the FIGS. 3 and 4 embodiment including a roof decking 16 overlaid by insulating board 48 and completed by further roof material in the form of one full layer 18 and a strip-in 22. Furthermore the coping and fascia strips 10-12 are relatively proportioned to accommodate the roof insulating board 48 and a layer 18 of roof material therebetween and anchor them to the roof as well as to accommodate insulating fascia board 46 between the respective skirts 28-30 of the trim, said fascia board 46 being received within the stirrup 34 of the tongue and stirrup interconnection between the coping and fascia strips. Likewise the actual means of securing the trim to the roof, and if required to the wall also, may be the same as hereinbefore described with respect to either of the two preceding embodiments and the rainwater deflector lip 44 on the fascia strip skirt 30 may also be the same as hereinbefore described.
It will be observed from FIG. 5 that the fascia strip 12 is proportioned relative to the coping strip 10 to provide accommodation between the two respective skirts for insulating fascia board 46 which extends above the surface of the roof thereby to provide an improved insulation to the roof in the vicinity of the wall to roof joint. Such fascia strip 12 is contoured not only to provide an abutment 42 at its upper edge to serve as a gravel stop and dam as hereinbefore described but also to be inclined from said abutment 42 to its roof anchor portion 26 to provide an integral cant strip for the edge trim assembly.
Provision of insulating fascia extending above the roof top level is not in itself new and in known constructions such a roof edge assembly has generally been completed by the addition of a cant strip of wedge-shape cross-sectional form to act as a filler between the fascia and the top surface of the roof and functioning also as support for a strip-in layer of roof material. However, such known cant strips are generally formed of wood and in any event have been separate from the fascia itself so that the instant fascia strip 12 contemplated by the FIG. 5 embodiment provides several advantages over the prior art inasmuch that it is an integral part of the trim assembly while at the same time it provides support for the strip-in layer 20 in known manner.
It may also be mentioned herein that certain problems of pressurization may occur in such roof structures of the type illustrated herein particularly in connection with the insulated type of roof structure as shown in FIGS. 4 and 5. It is known for example that it is a common property of building structures that pressurization tends to build up under the roof decking and subsequently within any roof insulation board which may be superposed upon the decking. If no means are provided to relieve such pressurization, the air pressure build up within the insulation board will break out where it can, generally between the upper surface of the insulation board and the layer of roofing felt, thereby causing ridging or bubbling in said roofing felt with a consequent tendency to run-off of the bituminous material with which it is coated hence causing failure of the roof as a whole. Furthermore, since said roof insulation boards are generally laid side by side in abutting relation on the roof deck, relief of the pressurization may tend to occur at such abutting joints causing ridging in the roofing felt with attendant danger of complete failure.
Venting of such pressurization within roof insulation board may easily be accomplished in the trim of the present invention by perforating the coping strip abutment 40 at positions adjacent the edge of the roof insulation board 48 whereby the air pressure may be vented to atmosphere between the coping strip skirt 28 and the facade of the building structure. Such perforation is indicated by the reference numeral 52 in FIGS. 3 and 4 of the drawings. Alternatively, if no perforations are provided in the coping strip, venting of the pressurization in the insulation board may be accomplished between the abutting ends of adjacent coping strips which are normally in lengths of approximately 10 feet secured in edge to edge relation around the periphery of a roof edge.
A further known problem is that roof decking, particularly if it includes concrete, is liable to have a high moisture content which may tend to pass into any roof insulation board laid thereupon. Since the roofing material laid over the roof insulation board is of a bituminized felt material impervious to water, condensation will tend to occur on the under surface of such roof layer with consequent moisture saturation of the roof insulation board and attendant failure of its insulating properties. It is therefore desirable to insert a vapor barrier, which may conveniently be polythene sheeting, to cover the entire under surface of the roof insulation board above the roof decking substantially in the manner shown by the sheet 54 in FIG. 5 of the drawings. Provision of such a water impervious vapor barrier 54 thereby contains the moisture within the roof decking 16 and prevents any moisture penetration from reaching the roof insulating board 48. It will be appreciated that in the provision of the vapor barrier 54 as shown in FIG. 5 it will be necessary also to perforate such barrier, preferably at the position where it lies between the edges of the roof insulation board 48 and the coping strip abutment 40, to vent any pressurization which may tend to build up in the insulation board in the manner aforesaid.
Thus the instant trim comprised of two superposed strips offers several advantages over known forms of edge trim as hereinbefore mentioned and, since the instant trim is conveniently formed of thin metal sections, which require no further finishing, complete elimination of any wooden cant strips or fascias or soffits is procured.