GB2142947A - Ventilated roof abutment curb - Google Patents

Ventilated roof abutment curb Download PDF

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Publication number
GB2142947A
GB2142947A GB08317378A GB8317378A GB2142947A GB 2142947 A GB2142947 A GB 2142947A GB 08317378 A GB08317378 A GB 08317378A GB 8317378 A GB8317378 A GB 8317378A GB 2142947 A GB2142947 A GB 2142947A
Authority
GB
United Kingdom
Prior art keywords
curb
abutment
roof
head
cover capping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08317378A
Other versions
GB2142947B (en
GB8317378D0 (en
Inventor
John Longworth
Original Assignee
John Longworth
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by John Longworth filed Critical John Longworth
Priority to GB08317378A priority Critical patent/GB2142947B/en
Publication of GB8317378D0 publication Critical patent/GB8317378D0/en
Publication of GB2142947A publication Critical patent/GB2142947A/en
Application granted granted Critical
Publication of GB2142947B publication Critical patent/GB2142947B/en
Expired legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
    • E04D13/17Ventilation of roof coverings not otherwise provided for
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04DROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
    • E04D13/14Junctions of roof sheathings to chimneys or other parts extending above the roof
    • E04D13/143Junctions of roof sheathings to chimneys or other parts extending above the roof with ventilating means in junctions of roof sheathings to parts extending above the roof

Abstract

The curb 3, between flat or pitched roof 1 and abutment wall 2, for ventilating the roof void 28, comprises a curb member 4 projecting up from the roof adjacent the abutment wall and spaced therefrom so as to leave a ventilation gap 9. Fixed to the head 8 of the curb member is a curb top 10 with supports 16 for a cover capping 17. The latter extends from abutment wall 2 over curb head 8 and has a front wall portion 24 overhanging the front of curb head 8, forming a passageway between ventilation gap 9 and the front of curb member 4. A grill 25 is formed from an inwardly bent portion along the lower edge of the overhanging wall and the flange 14 of the curb top to allow free flow of air whilst denying access to birds, small animals, etc. <IMAGE>

Description

SPECIFICATION Ventilated roof abutment curb The present invention relates to a ventilated roof abutment curb for use between a flat or pitched roof, or other roof covering, and an abutment wall.
In the case where a roof is constructed in abutting relation with a side wall, for example, in a single storey house extension, problems have been experienced with condensation occurring in the roof void between the roof covering and the ceiling. It is therefore important satisfactorily to vent this space.
Hitherto, ventilated curb structures for this purpose have been constructed in situ from timber joists and fillet, suitably covered with roofing felt and flashing.
Moreover, with a solid concrete roof, the roof screed, that is, a layer of cement and aggregate up to six or more inches thick which is placed on top of the concrete roof to form falls, can never adequately dry out before the applicaton of the covering and, unless the roof screed is ventilated, loss of adhesion, bubbling and degradation of the covering can be caused bythetrapped moisture.
It is an object of the present invention to provide a ventilated roof abutment curb which is suitable for ventilating roof voids and solid concrete roofs and which can be readily and economically constructed from prefabricated components.
To this end, the invention consists in a ventilated roof abutment curb comprising a curb member projecting upwardly from the roof adjacent an abutment wall and, preferably, inclined towards the abutment wall, said curb member being spaced from the wall so as to leave a ventilation gap, a curb top disposed on the head of the curb member and having upstanding support means for supporting a cover capping above the curb head, said cover capping extending from the abutment wall over the curb head and having a front wall portion overhanging the front of the curb head, whereby to provide a passageway between the ventilation gap and the front of the curb member, and a grille, mesh or other apertured member disposed between the overhanging wall portion and the curb member to allow for flow of ventilation air through the passageway whilst preventing the ingress of birds, animals, insects and other undesirable objects.
The capping may have an upstand portion extending up the face of the abutment wall for cooperation with suitable flashing secured to the wall above the capping. Alternatively, the upstand may, itself, form the flashing and, to this end, it may terminate in a rearwardly projecting flange secured in a chase in the abutment wall. Advantageously, the capping projects away from the wall at a downward inclination having a sufficient angle to take water away from the wall.
The curb top may include a generally horizontal spacer portion arranged to extend across the gap between the abutment wall and the curb head so as to space the head the required distance from the wall. This spacer portion has ventilation slots or openings therein to allow for free circulation of air to and from the roof space via the ventilation gap between the curb member and the wall, and the passageway between the curb top and the capping.
The curb top may also include a front edge portion turned downwardly in spaced relation to the front face of the curb member so as to cap and retain the top edge of roof covering material faced up the front of the curb member. The apertured member may be disposed between the front edge of the overhanging wall portion of the capping and the downturned front edge portion of the curb top. It may be formed from an inwardly bent portion of the capping which is suitably pierced to provide for circulation of ventilating air and which has its free rear edge attached to the front edge portion of the curb top by being clipped behind the front edge of the curb top or by means of spring clips or other suitable means.
Attachment of the integral apertured member to the front edge of the curb top assists in retaining the cover capping and preventing dislodgement by strong winds.
The curb member may be formed from sheet metal material or be molded or cast from plastics material, fibre-reinfo;ced plastics material or bitumen, asbestos cement or other material which may be rolled or molded to shape and is rigid enough to support itself and imposed loads and which is durable and able to withstand the heat of application of a roof covering. The curb top and cover capping may be formed of similar material which can be rolled or molded to shape and is able to resist the weather.
The curb head may comprise a generally horizontal flange extending along the top edge of the curb member. It may be molded or extruded integrally with the curb member or may be separately formed and attached to the member. The cover top and/or capping may be pre-fixed to the curb member or, more conveniently, may be fixed to the latter after application of roof covering material to the front face of the curb memberto allow such covering material to be worked under the curb top. The front face of the curb member may be keyed to provide better adhesion for roof covering material, such as, ashphalt, by piercing or by fixing expended metal to the face.
The present invention also consists in a set of components comprising a curb member, a curb top and cover capping for constructing a ventilated roof abutment curb of the kind described.
In order that the invention may be more readily understood, reference will now be made to the accompanying drawings, in which: Figure lisa cross sectional view through a first embodiment of the invention, Figure 2 is a perspective view, partially broken away, of the abutment curb shown in Figure 1 and also illustrates a modification, Figure 3 is a cross sectional view of a second embodiment of the invention for use at the head of a pitched roof, Figure 4 is a cross sectional view of a third embodiment for use at the side of a pitched roof, and Figure 5 is a cross sectional view of a fourth embodiment for use with a flat or pitched roof having a covering or profiled sheet material.
Throughout the various Figures like reference numerals indicate similar parts.
Referring to Figures 1 and 2 of the drawings, these illustrate the use of the invention between a flat roof 1 and a masonry abutment wall 2. The abutment curb 3 comprises an inclined sheet-like curb member 4 prefabricated, for example, from sheet metal material. It comprises a foot 5 along its bottom edge which is mechanically fixed to the roof deck 6, for example, by screws 7, and a head 8 in the form of a generally horizontal flange extending along its top edge. The roof deck 6 is supported on suitable joists (not shown) and finishes short of the abutment wall 2. The curb member 4 projects upwardly from the roof deck at an inclination of, for example, 70 and is spaced from the abutment wall so as to leave a ventilation gap 9 between the wall and the curb member. In one embodiment, the height of the curb member is approximately 1 50mm.
Attached to the curb head is a prefabricated curb top 10 of sheet material including a generally horizontal spacer portion 11 fixed to the head and projecting inwardly so as to engage the wall 2 and retain the curb head spaced therefrom. Along its rear edge, the spacer portion has a vertical flange 12 attached to the wall. The spacer portion has ventilation slots 13 therein. Along its front edge, the curb top has a flange 14 projecting downwardly in spaced substantially parallel relation to the curb member so as to encase the top of roof covering 15 faced up the front of the curb member. Fixed at spaced positions along the cover top are upstanding supports 16 for supporting cover capping 17. These supports are formed from sheet material and have their upper edges bent substantially at right angles to provide platforms 18 at the desired angle of inclination for supporting the capping.
The cover capping 17 is prefabricated from sheet material and is fixed to the upstanding supports 16.
It comprises a cover portion 19 inclined at a suitable angle 20 to take rain water away from the wall 2 and fixed to the platforms 18, an upstand 21 along the rear edge of the cover portion, extending flat up the face of the abutment wall and terminating in a flashing 22 wedged within a suitable chase 23 in the wall by means of lead wedges and pointed with mastic or mortar, as is standard practice, a front wall portion 24 along the front of the cover portion and overhanging the curb head 8 and flange 14 and directed substantially parallel to the curb member, and an inwardly bent portion 25 along the lower edge of the overhanging wall portion 24 disposed across the space between the overhanging wall and the flange 14 of the curb top.This bent portion 25 is pierced to allow for free flow of air, the flow area being not less than the area of the ventilation slots 13 in the curb top, and prevents the ingress of birds, animals, insects and other undesirabie objects. It is, in fact, bent back on itself so as to form a drip 26 along the front edge of the cover capping. It is fastened to the flange 14 of the curb top by being clipped behind the latter at 27. In this way, the curb top assists in retaining the cover capping and preventing its dislodgement by strong winds.
The roof covering 15 may comprise layers of ashphalt, built-up felt or a one layer roofing system applied to the roof deck 6 and is extended up the front face of the curb member 4. The latter may be keyed to provide for better adhesion of the covering material. Conveniently, the capping 17 is not fastened in position until after application of the roof covering in order to allow the covering material to be worked underthe curb head and curb top.
The resulting curb structure permits circulation of ventilating air to and from the roof void 28 below the roof deck 6, via the gap 29 between the roof deck and the abutment wall, the gap 9 between the curb member and the abutment wall, the ventilation slots 13 and the perforations or openings in the pierced portion 25 of the capping.
In a modification, as illustrated in Figure 2, the upstand 21a of the cover capping may be returned flat up the face of the abutment wall 2 and have metal, bitumen or plastic flashing 30 dressed over its upper edge portion, instead of also utilising the upstand 21,22 as the flashing.
Figure 3 illustrates the application of the invention to the head of a pitched roof 31. In this embodiment, the structure of the ventilated roof abutment curb 3 is similar to that illustrated in Figures 1 and 2 and will only be described in so far as is necessary to explain the differences. Hence, in Figure 3, the roof comprises rafters 32 attached to the abutment wall 2 by wall plates 33. The prefabricated curb member 4 is secured in position by fastening its foot 5 to a timber fillet 34 fixed to the rafters, for example, by nails. The sarking felt 35 covering the rafters is sandwiched between the curb foot and the fillet 34 and is finished short of the abutment wall 2 to allow for ventilation.
Save for the face that the cover capping 17 has an upstand 21a returned flat up the face of the abutment wall and separate flashing 30 is provided, which is wedged and pointed into the abutment wall, as is standard practice, the curb top 10 and cover capping 17 are constructed and arranged as shown in Figures 1 and 2. If the abutment wall 2 is covered in sheet material or tile hanging, the cover flashing would be carried up underneath.
The roof covering 31 is illustrated as interlocking concrete tiles 36 supported by tile battens 37.
However, it may be of any other material, such as plain tiles, slates, shingles or profiled sheet. The covering is terminated at the fillet 34 and the joint between the covering and fillet is sealed by means of metal faced bitumen self-adhesive flashing 38 adhered to the face of the curb member 4 and dressed down overthe roof covering.
Figure 4 illustrates the invention utilised at the side of a pitched roof 31. in this embodiment, the underlining felt 35 is returned around the end of the tile battens 37 and under the foot 5 of the curb member 4 which is fastened to the tile battens. In this way, a ventilation gap 40, which communicates with the ventilation gap 9 between the curb member and the abutment wall 2, is left between the rafters and the ends of the battens and the abutment wall 2.
The front face of the curb member 4 is finished with metal faced bitumen self-adhesive flashing 41 which is dressed over the adjacent edges of the tiles 36.
Figure 5 illustrates the use of the invention along the side of a flat or pitched roof 42 clad with profile sheet material 43. In this embodiment, the sheet material is finished short of the abutment wall 2 to provide the required ventilation gap 44 between the wall and the roof space, and the foot 5 of the curb member 4 is bedded on a neoprene or bitument sealing strip 45 and is fixed to the profiled roof, together with the sealing strip, for example, by means of self-tapping screws or bolts 46. Alternatively, the curb foot may be screwed, riveted or bolted to the roofing sheet and self-adhesive flashing may be applied over the fastenings. Such an arrangement is suitable for roof sheeting of asbestos cement and fibre reinforced bitumen.
Whilst particular embodiments have been described, it will be understood that modifications can be made without departing from the scope of the invention.

Claims (14)

1. A ventilated roof abutment curb comprising a curb member projecting upwardly from the roof adjacent an abutment wall, said curb member being spaced from the wall so as to leave a ventilation gap, a curb top disposed at the head of the curb member and having upstanding support means which supports a cover capping above the curb head, said cover capping extending from the abutment wall over the curb head and having a front wall portion overhanging the front of the curb head, whereby to provide a passageway between the ventilation gap and the front of the curb member, and a grille, mesh or other apertured member disposed between the overhanging wall portion and the curb member.
2. A ventilated roof abutment curb as claimed in claim 1, wherein the curb member is inclined towards the abutment wall and the cover capping projects away from the wall at a downward inclination having a sufficient angle to take water away from the wall.
3. A ventilated roof abutment curb as claimed in claim 1 or 2, wherein the cover capping has an upstand portion extending up the face of the abut menu wall for cooperation with flashing secured to the wall above the cover capping.
4. A ventilated roof abutment curb as claimed in claim 1 or 2, wherein the cover capping has an upstand portion extending up the face of the abutmenu wall and terminates in a rearwardly projecting flange secured in a chase in the abutment wall, whereby to form flashing.
5. A ventilated roof abutment curb as claimed in any one of the preceding claims, wherein the curb top includes a generally horizontal spacer portion arranged to extend across the gap between the abutment wall and the curb head so as to space the head a required distance from the wall, said spacer portion having ventilation slots or openings therein to allow for free circulation of air to and from the roof space via the ventilation gap between the curb member and the wall and the passageway between the curb top and the cover capping.
6. A ventilated roof abutment curb as claimed in any one of the preceding claims, wherein the curb top includes a front edge portion turned downwardly in spaced relation to the front face of the curb member so as to cap and retain the top edge of roof covering material faced up the front of the curb member.
7. A ventilated roof abutment curb as claimed in claim 6, wherein the apertured member is disposed between the front edge of the overhanging wall portion of the cover capping and the down turned front edge portion of the curb top.
8. A ventilated roof abutment curb as claimed in any one of the preceding claims, wherein the apertured member comprises an inwardly bent portion of the cover capping which is suitably pierced to provide for circulation of ventilating air and which has its free rear edge attached to the front edge portion of the curb top.
9. A ventilated roof abutment curb as claimed in any one of the preceding claims, wherein the curb head comprises a generally horizontal flange extending along the top edge of the curb member.
10. A ventilated roof abutment curb as claimed in any one of the preceding claims, wherein the cover top and/or cover capping are prefixed to the curb member.
11. A ventilated roof abutment curb as claimed in any one of the preceding claims, wherein the front face of the curb member is keyed by piercing or by having expanded metal fixed to the face thereof to provide for better adhesion of roof covering material.
12. A ventilated roof abutment curb as claimed in any one of the preceding claims, wherein the curb member, curb top and/or cover capping are formed from sheet metal material or are moulded or cast from plastics material, fibre reinforced plastics material or bitumen, asbestos cement, or other material which may be rolled or moulded to shape.
13. Aventilated roof abutment curb constructed and arranged substantially as hereinbefore described with reference to Figures 1 and 2 or Figure 3, 4 or 5 of the accompanying drawings.
14. A set of components comprising a curb member, a curb top and cover capping suitable for use in constructing a ventilated roof abutment curb as claimed in any one of the preceding claims.
GB08317378A 1983-06-27 1983-06-27 Ventilated roof abutment curb Expired GB2142947B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08317378A GB2142947B (en) 1983-06-27 1983-06-27 Ventilated roof abutment curb

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08317378A GB2142947B (en) 1983-06-27 1983-06-27 Ventilated roof abutment curb

Publications (3)

Publication Number Publication Date
GB8317378D0 GB8317378D0 (en) 1983-07-27
GB2142947A true GB2142947A (en) 1985-01-30
GB2142947B GB2142947B (en) 1986-10-22

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Family Applications (1)

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GB08317378A Expired GB2142947B (en) 1983-06-27 1983-06-27 Ventilated roof abutment curb

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153067A (en) * 1984-01-20 1985-08-14 Glidevale Building Prod Ventilator for ventilating the roof space of an extension building
GB2164141A (en) * 1984-08-25 1986-03-12 Glidevale Building Prod Ventilated roof structure for an extension building
GB2186304A (en) * 1986-04-09 1987-08-12 David Frederick Martin Roof ventilator
GB2189024A (en) * 1984-01-20 1987-10-14 Glidevale Building Prod Ventilator for ventilating the roof space of an extension building
GB2234270A (en) * 1989-04-26 1991-01-30 George Bowlt Ventilator/flashing
US5035172A (en) * 1989-05-24 1991-07-30 Alumax Inc. Roof ventilating apparatus
FR2755163A1 (en) * 1996-10-29 1998-04-30 Hep FACING STRUCTURE FOR CONSTRUCTIONS REQUIRING VENTILATION
WO1999001627A1 (en) * 1997-07-02 1999-01-14 Joseph Fisher Ventilated roofing panel support

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153067A (en) * 1984-01-20 1985-08-14 Glidevale Building Prod Ventilator for ventilating the roof space of an extension building
GB2189024A (en) * 1984-01-20 1987-10-14 Glidevale Building Prod Ventilator for ventilating the roof space of an extension building
GB2164141A (en) * 1984-08-25 1986-03-12 Glidevale Building Prod Ventilated roof structure for an extension building
GB2186304A (en) * 1986-04-09 1987-08-12 David Frederick Martin Roof ventilator
GB2234270A (en) * 1989-04-26 1991-01-30 George Bowlt Ventilator/flashing
US5035172A (en) * 1989-05-24 1991-07-30 Alumax Inc. Roof ventilating apparatus
FR2755163A1 (en) * 1996-10-29 1998-04-30 Hep FACING STRUCTURE FOR CONSTRUCTIONS REQUIRING VENTILATION
EP0840069A1 (en) * 1996-10-29 1998-05-06 H E P Ridge structure for construction requiring ventilation
WO1999001627A1 (en) * 1997-07-02 1999-01-14 Joseph Fisher Ventilated roofing panel support

Also Published As

Publication number Publication date
GB8317378D0 (en) 1983-07-27
GB2142947B (en) 1986-10-22

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920627