GB2138466A

GB2138466A - Roof flashings

Info

Publication number: GB2138466A
Application number: GB08409873A
Authority: GB
Inventors: David John Birchall
Original assignee: Individual
Current assignee: Individual
Priority date: 1983-04-21
Filing date: 1984-04-16
Publication date: 1984-10-24
Also published as: GB8409873D0

Abstract

A flashing unit for connecting a lean- to roof to a vertical brick wall, comprises two parts (4 and 5) separated by adjustable brackets (6) which space the two parts to provide an airflow from within the roof space to the outside between the separated parts. The flashing unit is made adjustable to allow for discrepancies in brick course depths. The unit is made in standard lengths which may be joined together to form flashings of any required multiple of the standard length. <IMAGE>

Description

SPECIFICATION Improvements in or relating to roof flashings The present invention relates to roofflashings and is more particularly concerned with such flashings which are used to secure lean-to pitched orflat rooves to vertical brickwork, such as walls.

In the construction of lean-to pitched orflat rooves, for use for example in house extensions or attached garages, Building Regulations F5 in the United King domcallsforanairflowwithinthe roof space.

Currently, such ventilation is provided by roof vents or ventilating roof tiles. The use of such ventilation arrangements leads to restricted ventilation areas in the roof space due to the so-called chimney effect.

It is an object ofthe present invention to provide a roofflashing unitwhich will enhancetheventilation of the roof space of rooves which abut brickwork walls.

According to the invention there is provided a roof flashing unit comprising two longitudinal parts, one adapted to co-operate, in use, with a wall brick course and the other adapted to co-operate in use with the roof cladding of a lean-to roof the two parts being joined together in an overlapping manner by spacer means arranged to separate the overlapped surfaces ofthetwo parts so asto provide an airflow path between the said surfaces.

Accordingly to a feature of the invention the spacer means comprise brackets which are arranged to be adjustably fixed to allow a variation in overall height of the flashing unit corresponding to the height of one standard brick course.

Theflashing unit according to the invention also includes a fly screen, comprising a fine mesh gauze, located in the airflow path ofthe flashing unit.

According to one embodiment of the invention the flashing unit is supplied in standard lengths and incorporates jointing brackets to interconnect standard lengths to form a flashing of any required length in multiples ofthe standard length.

According to a feature of one embodiment ofthe invention the flashing unit incorporates end caps to seal the ends of a flashing run againstweather.

Theflashingunitcomprisesan upperpartadapted to co-operate with a wall brick course and a lower part adapted to co-operate with the roof cladding, and the lower part comprises a roof cladding co-operating portion which is shaped atvarious angles to accommodate various pitches.

Theflashing maybe madeofformed 19 standard wire gauge aluminium or extruded plastics material of the like.

The invention, together with its varioius features, will be more readily understood from the following description of one embodiment which should be read in conjunction with the accompanying drawing.

The drawing shows the end view of a lean-to pitched roof attached to a brickwork wall by a flashing unit according to the invention. The pitched roof is terminated in a soffit 2 which is located 15 m.m. from a brickwall so that the roof tiles, battens and felt used in the construction ofthe roof are similarly kept 15 m.m.

from the wall to provide a ventilation gap 3. The flashing unit consists oftwo longitudinal parts, an upper part4, a lower part 5 and a number of separating brackets 6. The separating bracket 6 is shown in enlargedform in the drawing and consists of a J shaped arrangement incorporating a slot7 in its longest side. A number of brackets 6 are riveted at selected points onto the upper part 4 of theflashing unit along its length. The slot 7 is used to adjustably accommodate nuts and bolts, such as 8, which are passed through an aperture in the lowerpart5 of the flashing unit, to secure the two parts ofthe flashing unittogether.The slot allowsthetwo parts 4 and 5 to be adjustably interconnected to allow for variation in brick courses (typicallythe adjustment allowed for is of the order of 750 m .m.). The dotted detail in the drawing shows the unit in its smallest vertical height condition. The upper4 and lower parts 5 are overlapped and separated by 25 m.m. by the bracket 6. The upper part 4 of the flashing unit includes atop right-angled piece 9 arrangedto be built intothe brickwork of a wall againstwhich the roof isto be located. The roof is supported upon a block 11 attached to the wall. The lower part 5 ofthe flashing unit incorporates a section 10 angled in accordance with the degree of pitch required for the roof.Typically a 100 m.m. lap onto the tiles is usedforthe lower part.

The roof cladding is placed onthetop ofthefeltand effectivelytrapsthe projection 10 between felt and rooftiles. Incorporated into the flashing unit is a fly screen which is located either in the air gap between thetwo parts of the flashing unit or on the underside of the vertical section of the lower part Sin the ventilation gap 3. The airflow path for the roof space involves the ventilation gap 3 and the gap between the separated upper and lower parts oftheflashing unit.

Theflashing unit components are made in standard lengths of 1400 m.m. which can be joined togetherto form a multiple unit. The completed flashing is supplied with speciai end caps and jointing brackets to form a continuing run of any length. The angled section 10 ofthe lower part 5 may be shaped at various angles to accommodate the usual roof pitches.

The component parts oftheflashing unit may be made of aluminium or plastics or similar material. The above description has been of one embodiment only and is not intended to be limiting to the scope ofthe invention. Alternative arrangements will readily be seen bythose skilled in the art. For examplethespacer brackets could be separate units secured to both parts byseparate nut and boltfixings. The embodiment has considered a pitched lean-to roof, however, itwili be realisedthattheinvention is equallyapplicableto so called flat rooves.

1. Aroofflashing unit comprising two longitudinal parts one adapted to co-operate in use with a brick course of a wall and the other adapted to co-operate withthecladdingofa lean-to roof,thetwo parts being joined together in an overlapping manner by spacer means arranged to separate the overlapped surfaces ofthetwo parts so asto provide an airflow path between the said surfaces.

2. Aroofflashing unitaccordingtoclaim 1 in which the spacer means comprise brackets which are arranged to be adjustablyfixed to allow a variation in overall heightoftheflashing unit corresponding to the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to roof flashings The present invention relates to roofflashings and is more particularly concerned with such flashings which are used to secure lean-to pitched orflat rooves to vertical brickwork, such as walls. In the construction of lean-to pitched orflat rooves, for use for example in house extensions or attached garages, Building Regulations F5 in the United King domcallsforanairflowwithinthe roof space. Currently, such ventilation is provided by roof vents or ventilating roof tiles. The use of such ventilation arrangements leads to restricted ventilation areas in the roof space due to the so-called chimney effect. It is an object ofthe present invention to provide a roofflashing unitwhich will enhancetheventilation of the roof space of rooves which abut brickwork walls. According to the invention there is provided a roof flashing unit comprising two longitudinal parts, one adapted to co-operate, in use, with a wall brick course and the other adapted to co-operate in use with the roof cladding of a lean-to roof the two parts being joined together in an overlapping manner by spacer means arranged to separate the overlapped surfaces ofthetwo parts so asto provide an airflow path between the said surfaces. Accordingly to a feature of the invention the spacer means comprise brackets which are arranged to be adjustably fixed to allow a variation in overall height of the flashing unit corresponding to the height of one standard brick course. Theflashing unit according to the invention also includes a fly screen, comprising a fine mesh gauze, located in the airflow path ofthe flashing unit. According to one embodiment of the invention the flashing unit is supplied in standard lengths and incorporates jointing brackets to interconnect standard lengths to form a flashing of any required length in multiples ofthe standard length. According to a feature of one embodiment ofthe invention the flashing unit incorporates end caps to seal the ends of a flashing run againstweather. Theflashingunitcomprisesan upperpartadapted to co-operate with a wall brick course and a lower part adapted to co-operate with the roof cladding, and the lower part comprises a roof cladding co-operating portion which is shaped atvarious angles to accommodate various pitches. Theflashing maybe madeofformed 19 standard wire gauge aluminium or extruded plastics material of the like. The invention, together with its varioius features, will be more readily understood from the following description of one embodiment which should be read in conjunction with the accompanying drawing. The drawing shows the end view of a lean-to pitched roof attached to a brickwork wall by a flashing unit according to the invention. The pitched roof is terminated in a soffit 2 which is located 15 m.m. from a brickwall so that the roof tiles, battens and felt used in the construction ofthe roof are similarly kept 15 m.m. from the wall to provide a ventilation gap 3. The flashing unit consists oftwo longitudinal parts, an upper part4, a lower part 5 and a number of separating brackets 6. The separating bracket 6 is shown in enlargedform in the drawing and consists of a J shaped arrangement incorporating a slot7 in its longest side. A number of brackets 6 are riveted at selected points onto the upper part 4 of theflashing unit along its length. The slot 7 is used to adjustably accommodate nuts and bolts, such as 8, which are passed through an aperture in the lowerpart5 of the flashing unit, to secure the two parts ofthe flashing unittogether.The slot allowsthetwo parts 4 and 5 to be adjustably interconnected to allow for variation in brick courses (typicallythe adjustment allowed for is of the order of 750 m .m.). The dotted detail in the drawing shows the unit in its smallest vertical height condition. The upper4 and lower parts 5 are overlapped and separated by 25 m.m. by the bracket 6. The upper part 4 of the flashing unit includes atop right-angled piece 9 arrangedto be built intothe brickwork of a wall againstwhich the roof isto be located. The roof is supported upon a block 11 attached to the wall. The lower part 5 ofthe flashing unit incorporates a section 10 angled in accordance with the degree of pitch required for the roof.Typically a 100 m.m. lap onto the tiles is usedforthe lower part. The roof cladding is placed onthetop ofthefeltand effectivelytrapsthe projection 10 between felt and rooftiles. Incorporated into the flashing unit is a fly screen which is located either in the air gap between thetwo parts of the flashing unit or on the underside of the vertical section of the lower part Sin the ventilation gap 3. The airflow path for the roof space involves the ventilation gap 3 and the gap between the separated upper and lower parts oftheflashing unit. Theflashing unit components are made in standard lengths of 1400 m.m. which can be joined togetherto form a multiple unit. The completed flashing is supplied with speciai end caps and jointing brackets to form a continuing run of any length. The angled section 10 ofthe lower part 5 may be shaped at various angles to accommodate the usual roof pitches. The component parts oftheflashing unit may be made of aluminium or plastics or similar material. The above description has been of one embodiment only and is not intended to be limiting to the scope ofthe invention. Alternative arrangements will readily be seen bythose skilled in the art. For examplethespacer brackets could be separate units secured to both parts byseparate nut and boltfixings. The embodiment has considered a pitched lean-to roof, however, itwili be realisedthattheinvention is equallyapplicableto so called flat rooves. CLAIMS

2. Aroofflashing unitaccordingtoclaim 1 in which the spacer means comprise brackets which are arranged to be adjustablyfixed to allow a variation in overall heightoftheflashing unit corresponding to the height of one standard wall brick course.

3. A roof flashing unit according to claim 1 or 2 in which a fly screen is located in the airflow path.

4. A roof flashing unit according to claim 3 in which the fly screen comprises a fine mesh gauze.

5. A roof flashing unitaccording to anyone ofthe preceding claims in which the said one part incorporates a projection at substantially right-angles to the plane ofthe one part adapted to be inserted into a wall brick course.

6. A roof flashing unit according to claim 5 in which the said other part includes a roof cladding co-operating portion which is shaped atvarious angles corresponding to various roof pitches.

7. A roof flashing unit according to any one ofthe preceding claims manufactured in standard lengths and adapted to be interconnected to form a unit of multiple lengths.

8. A roof flashing unit according to claim 7 and including end caps arranged to seal the ends ofthe unit against weather.

9. A roofflashing unit substantially as herein before described and with reference to the accompanying drawings.