AU2019203509A1

AU2019203509A1 - A rendering aid and a method of rendering

Info

Publication number: AU2019203509A1
Application number: AU2019203509A
Authority: AU
Inventors: Alan Probert
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-12-10

Abstract

The present invention provides an apparatus for use in the rendering of building structures, the apparatus comprising at least one work aid component 10 the or each of which includes an elongated main body 12 for receiving and or engaging render 74 or a panel 65 to be rendered, the main body 12 having a cross-sectional profile which includes a base wall 18 and at least one laterally extending arm 25 which extends from the base wall 12 and a flange 30 extending the main body 12 which is, after rendering has been completed, removeable from said main body 12, said main body 12 being adapted to attach said apparatus to a surface adjacent to a surface to be rendered, and said flange 30 including means to hold a cover, to protect a surface adjacent, or near, a surface to rendered. P5838AU00 1/12 r-I Ii co m 0 r_4 rH- LO

Description

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LO IMPROVEMENTS IN OR RELATING TO RENDERING OF BUILDING STRUCTURES TECHNICAL FIELD

[0001] This disclosure relates generally to the rendering of building structures and the like. The building structure may take different forms. For example it, may comprise a base wall per se which is

often a masonry structure formed from concrete or brick. In some instances it may also include

panelling attached to the base wall. The structure may be part of a building such as a building wall,

an eave by way of example. Other structures may include a barrier wall, column, fence or the like.

BACKGROUND ART

[0002] Rendering of building structures is an often used procedure in the construction or renovation of buildings. The rendering procedure requires the application of render to the surface of a structure

to achieve a smooth or deliberately textured surface. The purpose of the render can be to improve

the properties of the structure such as improve waterproofing or simply be for aesthetic purposes.

The render may for example be a mixture of cement, sand and lime but also may include pigment,

bonding agents and other additives. The render may also be of an acrylic form which can be stronger,

more flexible and less likely to crack than traditional renders. It is desirable that the finished rendered wall is aesthetically pleasing and this can be difficult to achieve in certain applications.

SUMMARY OF DISCLOSURE

[0003] In a first aspect embodiment is disclosed an apparatus for use in the rendering of building structures, the apparatus comprising at least one work aid component the or each of which includes

an elongated main body having opposed ends with a longitudinal axis extending in a direction from

one end to the other end, the main body having a cross-sectional profile which includes, a base wall

having an inner side, an outer side, an inner end and an outer end. The outer end may provide a

locating section for the apparatus. The main body further includes a laterally extending arm which

extends from the inner end of the base wall in a direction away from the inner side of the base wall.

The arm may provide for a guide section of the apparatus. The main body further includes a flange

extending from the inner end of the base wall the flange being substantially collinear therewith. The

flange may provide for a shield for the apparatus. The main body further includes a weakened or

frangible zone at a junction of the inner end of the base wall and the flange and extending in the

direction of the longitudinal axis. The component further includes an attachment element on the outer side of the base wall, and a retaining element on the inner side of the flange.

[0004] In certain embodiments the apparatus includes a further laterally extending arm which extends from the outer end of the base wall in the same direction and parallel to the other arm, the

two arms and the base wall providing a channel with an open side.

[0005] In certain embodiments the weakened or frangible zone comprises a notch or groove in a side of the junction between the base wall and flange.

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[0006] In certain embodiments the attachment element comprises double sided adhesive tape on the outer side of the base wall. In certain embodiments Apparatus according the adhesive tape is of

the PE foam type.

[0007] In certain embodiments the retaining element comprises double sided adhesive tape on the inner side of the flange. In certain embodiments the adhesive tape is of the blue type.

[0008] The present invention also provides apparatus for use in the rendering of building structures, the apparatus comprising at least one work aid component the or each of which includes an

elongated main body for receiving and or engaging render or a panel to be rendered, the main body

having a cross-sectional profile which includes a base wall and at least one laterally extending arm

which extends from the base wall and a flange extending the main body which is, after rendering has

been completed, removeable from said main body, said main body being adapted to attach said

apparatus to a surface adjacent to a surface to be rendered, and said flange including means to hold

a cover, to protect a surface adjacent, or near, a surface to rendered.

[0009] The main body can be attached by any known means to said surface including one or more than one of the following: double sided tape; adhesive; tack; nail; screw; staple, double sided PE

foam tape.

[0010] The flange can be joined to said main body by a frangible or breakable or cuttable join.

[0011] The flange can includes a means to hold a cover which means is in the form of double sided tape.

[0012] In certain embodiments wherein the main body is an extruded section. In certain embodiments the main body is formed of a plastics material.

[0013] In certain embodiments the apparatus comprises a plurality of the work aid components are arranged end to end. In certain embodiments a plurality of the work aid components are arranged

relative to one another in an enclosed framing array. In certain embodiments the work aid

components arranged relative to one another in a partially enclosed framing array.

[0014] In a second aspect embodiments are disclosed of an installation for use in the rendering of building structures, the structure including a first surface section to which reader is to be applied and

a second surface section which remains substantially free of render, there being a boundary between

the first and second surface sections, the installation comprising one or more work aid components

as described above, the work aid component being positioned on the structure with the laterally

extending arm being substantially aligned with the boundary between the first and second surface

sections, and the outer side of the base wall being secured to the first surface section by means of

the attachment element, the flange of the work aid component extending away from the first surface section.

[0015] In certain embodiments the flange overlies the second surface section.

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[0016] In certain embodiments the building structure comprises a wall having an opening therein and a window disposed within the opening and including a window front which is offset from a wall

surface to be rendered, a plurality of said work aid components positioned around the window frame, the outer end of the base wall of each component abut against a surface of the wall structure,

the base wall of each work aid component being secured to part of the window frame and the flange

extending over a further part of the window frame.

[0017] In certain embodiments the building structure includes an eave which extends laterally from a wall surface of the structure wherein the work aid component is mounted in the region of the

boundary between the eave and the wall surface, the outer end of the base wall abutting against the

wall surface and the outer side of the base wall secured to the eave by the attachment element with

the flange overlying part of the surface of the eave.

[0018] In a third aspect embodiments are disclosed of a method of rendering a surface of a building structure, the structure including a first surface portion to which render is to be applied and a second

surface portion which is not to be rendered, the first and second surface portions being adjacent one

another with a boundary therebetween the method comprising the steps of, providing one or more

work aid components as described above, positioning the work aid component in the region of the

boundary between the first and second surface portions of the building structure with the arm being

substantially aligned with the boundary, attaching the outer side of the base wall to the building

structure, applying a render to the first portion of the building structure so that the render overlies

the base wall and finishes at the arm, and thereafter removing the flange by tearing along the

weakened of frangible zone.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Notwithstanding any forms which may fall within the scope of the method and apparatus set forth in the summary, specific embodiments of the method and apparatus will now be described by

the way of example ad with reference to the accompanying drawing in which:

Figure 1 is an isometric view of a work aid component according to one embodiment viewed from

one side;

Figure 2 is an isometric view of the component shown in Figure 1 viewed from the other side;

Figure 3 is a first side elevation of the component shown in Figures 1 and 2;

Figure 4 is a second side elevation of the component shown in Figures 1 to 3;

Figure 5 is a rear side elevation of the component shown in Figures 1 to 4; Figure 6 is a front side elevation of the component shown in Figures 1 to 5;

Figure 7 is a first end elevation of the component shown in Figures I to 6;

Figure 8 is a second end elevation of the component shown in Figures 1 to 7.

Figures 9 to 16 illustrate a first installation;

Figures 17 to 22 illustrate a second installation;

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Figures 23 and 24 illustrate a third installation;

Figures 25 and 26 illustrate a fourth installation; Figures 27 to 30 illustrate further embodiments.

DETAILED DESCRIPTION

[0020] Referring to Figures 1 to 8 there is illustrated a rendering or work aid component according to one embodiment. As shown the component 10 comprises a main body 12 which is elongated in

form and having opposed ends 13 and 14 with a longitudinal axis X-X extending from one end 13 to

the other 14. The longitudinal axis X-X is shown in Figure 3. The main body 12 is in the form of an

extruded profile 16 and may be formed from any suitable material such as plastics material or more

particularly polypropylene. It will be appreciated that it may be formed by other techniques and

other materials may be used.

[0021] The main body 12 when viewed in cross-section or from one of the ends 13 or 14 as in Figure 7 or 8, comprises a base wall 18 having an inner side 20, an outer side 21, and inner end 22 and an

outer end 23. The main body 12 further includes a laterally extending inner arm 25 at the inner end

22 of the base wall 18. The inner arm 25 extends laterally away from the inner side 20 and, as shown

is at about 900 to the inner face of the inner side 20. The main body 12 further includes an outer arm 26 at the outer end 23 of the base wall 18. As shown the outer arm 26 extends laterally away from

the inner face of the inner side 20 in the same direction as the inner arm 25. Thus the base wall 18,

and the arms 25 and 26 form a channel 27with an open side.

[0022] The main body 12 further includes a flange or leg 30 at the inner end 22 of the base wall 18, the flange or leg 30 extending away from the base wall 18 in the direction of the longitudinal axis X-X.

As shown the flange or leg 30 is substantially collinear with the base wall 18. The flange or leg 30 has

an inner side 31 and an outer side 32 having surfaces which are substantially coplanar with

respective surfaces of the inner side 20 and outer side 21 of the base wall 18.

[0023] The main body 12 further includes a weakened or frangible zone 33 at the junction between the ends of the flange or leg 30 and the base wall 18. As shown the zone 33 is in the form of an

elongated groove or score line 26 which extends along the main body 12 in the direction of the

longitudinal axis X-X. As shown the groove 36 is in the outer side or immediately adjacent the outer

side 21 of the base wall 18, and is between the outer sides 21 and 32.

[0024] The work aid component 10 further includes an attachment element 45 on the outer side 21 of the base wall 18. As shown the attachment element 45 comprises adhesive tape 47 secured to the outer side 21of the base wall 18. The tape 47 may be in the form of double sided PE foam tape.

Other types of attachment elements may be suitable in certain applications. For example an adhesive

may provided directly on the outer side of the base wall 18. In other cases fasteners such as screws

or nails may be used. Double sided foam tape is preferably used because windows frames, and other

P5838AU00 surfaces to which it may be attached are usually aluminium or timber, while walls may be brick masonry or some other material. The foam tape 47 allows for different rates of expansion.

[0025] The work aid component 10 further includes a retaining element 48 on the inner side 31 of the flange or leg 30. The retaining element 48 may be in the form of double sided tape.

[0026] Figures 9 to 16 illustrate an installation 60 which comprises a plurality of work aid components 10. In this particular application the structure 50 to be rendered comprises a base wall

51 which as shown is a brick wall having a main wall surface 56. The base wall 51 has an opening 52

therein for receiving a window frame 55. As shown the window frame 55 abuts against a lateral

surface 57 of the base wall 51.

[0027] The installation 60 comprises four work aid components 10 (only two are visible) which are arranged together to form a rectangular frame. The adjacent ends of adjacent components 10 are

configured to form a joint. To this end one of the components 10A has a cut-out section 62 in the

flange 30 thereof which receives the end of the adjacent component 10B. The cut-out section can be

created by use of a knife or side cutters as required. As shown the outer arm 26 of each component

10 abuts against the lateral surface 57 with the flange 30 overlying the window frame 55. When

installed the attachment element 45 and tape 47 secures the components onto the wall surface 57

so as to secure the components in place. As shown in Figure 12 a cover 70 is attached to the retaining

element 46 so that the cover overlies and provides protection from splatter during rendering for the

window panes or opening.

[0028] Render 75 is then applied to wall surfaces 56 and 57. The render fills the channel 27 terminating at the inner arm 26. Once the rendering process has been completed, the cover 70 can

be removed, then flange 30 can be removed by tearing along the weakened zone 33, or they can be

removed simultaneously. This is illustrated in Figures 13 and 14. As shown in Figures 15 and 16 the

installation enables a smooth finish at the inner edge of the rendered section on lateral surfaces 57

provided by the surface of the inner arm 26.

[0029] Figures 17 to 22 illustrate a similar arrangement to that shown in Figures 9 to 16 except in this case the structure 50 comprises a base wall 51 to which panels 65 are attached. The panels may

be of different types such as blueboard panel's drywall panels, or fibrous cement panels for example.

Blueboard is a gypsum wall panel having a surface of paper which enables it to be covered by a thin

coating of render after installation. Drywall panels are in essence plaster type panels. Fibrous cement

panels are a composite formed of cement and reinforced with fibre materials. As shown in Figures 17 to 20 the panel 65 has its edge positioned within the channel 27. Render 75 is then applied to the

surface ofthe panels65.

[0030] Figures 23 to 26 illustrate an installation for the eave of a structure. In Figures 23 and 24 the structure comprises a base wall 51 with the eave 66 extending therefrom, which is to be covered and

protected from splattering render. In Figures 25 and 26 the structure comprises a base wall 51 to P5838AU00 which panels 65 are attached. In both cases the work aid components 10 are positioned so that the flange 30 overlies the eave 66, being the surface to be protected. The other end of a cover 70 that will be used can be secured to a fascia on the other side of the eave 66, or to the eave 66 by means of masking tape or similar means.

[0031] Figures 27 and 28 illustrate a further embodiment of work aid component 10' and 10" respectively. They are similar to that described with reference in particular to Figures 1 to 8 and as

such the same reference numerals have been used to identify the same parts. The difference is that

in these embodiments there is no outer arm 26. In the case of Figure 27, foam tape 48 is shown

attached as the attachment element 45, whereas in Figure 28 no foam tape is present as the

attachment may be by a nail or screw or glue via attachment element 45.

[0032] One of the advantages of the component 10 is that the colour from which it is moulded or extruded can be the same as the colour of the render that it is used with. Alternatively, the

component 10 gives the renderer and or the customer the option of selecting or providing a

contrasting or matching colour for the component 10 to enhance the appearance of the rendered

finish with respect to the eaves, window or door frames present.

[0033] Illustrated in Figure 29 is an extruded mitre section 100, which forms two channels at 90 degrees to each other, which can be used by a renderer to frame up external or internal corners to

be the same colour as the components 10. If the section 100 is to be used on an external corner of a

wall, the internal surfaces 101 will be adhered to two adjacent surfaces of the external corner.

Whereas if an internal corner were to receive the section 100 then outer surfaces 102 would be used

to secure or adhere adjacent the wall surfaces. The adhere can be done by double sided tape, glue or

other securing like nailing or screwing into position, depending upon the co-efficient of thermal

expansion of the respective surfaces being rendered and or being contacted by the components 10,

100.

[0034] The preferred dimensions of the features of the device 10 is that the foam tape 47 is approximately 1.5 mm thick, and makes a very strong bond to surfaces to which it is to be attached,

whereas the double sided tape 48 is a relatively inexpensive double sided tape to hold the window

opening or pane protection covers 70 in place, which may be paper, or thin sheet plastic or film.

[0035] All the walls 18, 25, 26 and flange 30 are preferably 1mm in thickness, while the walls 25 and 26 extend approximately 10mm from the outside surface 21, and the distance between the outside

surfaces of the walls 25 and 26 is approximately 10mm, allowing a snug fit for an 8mm thick blue board panel 65 into the channel 27. Additionally, the channel 27 so sized will readily receive a fibrous

cement sheet edge which is 5.5mm or 6mm thick, which is also less that the distance between the

channel 27 walls.

[0036] Illustrated in Figure 30 is another component 10"' which is similar to that of Figure 27 and 28, except that no foam tape or double sided tape is present. It will be noted that the groove 36 is, P5838AU00 unlike the previous embodiments, provided on the same side of the component 10 as the wall 25.

The flange 30 can be removed in the same manner as previously described. The embodiment of Figure 30 is useful to also show the dimensions T and W that may be utilised with the components

10, 10', 10", 10"'. For example, the components 10 can be provided with a dimension T according to

the thickness of the render to be applied to a wall. This may vary, and suppliers of the components

10, 10', 10", 10"' may provide or carry a range of components with differing dimensions T.

[0037] The dimension W is an indication of the amount of "float surface" needed to be provided for the rendered to run his float or trowel over. Thus for experienced renderers, a dimension W need

only be relatively small say of the order of 3mm to 5 mm, whereas for less experienced renderers, a

dimension W of the order of 8mm to 12 mm may be more appropriate.

[0038] The thickness of the walls 18 and 25 and flange 30 while preferably of the order of1mm, can be selected according to the rendering job at hand, and producers of the components 10, 10', 10",

10"'can provide differing thicknesses, to give the renderer a choice or opportunity to provide

differing results or effects in the finished rendered work.

[0039] If the panel 65 being used is a blue board panel or fibrous cement, then an ACRYLIC RENDER will be used, and a float or a sponge finish applied to the acrylic render. The float or sponge will finish

the render by contacting and passing over the outer surface of the wall 25, so that the wall 25 will

appear as if it is embedded into the render surface.

[0040] If the wall surfaces 56 and 57 are of cement, then an acrylic render will also be used, and generally a base coat is applied then a finishing coat. The finishing coat will be float or sponge

finished.

[0041] Cement render can only be applied to wall surfaces 56 and 57 if they are of masonry or brick. If cement render is used it will be finished with a float finish.

[00421 If MONOCOUCHE is used as the render material then it is generally finished with a SCRAPPED finish.

[0043] The invention can be used on internal surfaces too, and would have to be sized to receive GYPROX or drywall panels which are generally sized to be either 10mm or 13mm in thickness, and so

a different width channel 27 would be needed, but internal use of the device 1 is still within scope of

the invention.

[0044] While the above describes the grooves 36 as the means to allow separation of the flange 30 from the main body 12, other means could be provided to allow this separation to occur. For

example a thin wire or other means can be provided which when pulled creates the separation or

cutting of the flange 30 from the main body 12.

[0045] In the forgoing description of preferred embodiments, specific terminology has been resorted to for the sake of clarity. However, the invention is not intended to be limited to specific

terms so selected, and it is to be understood that each specific term includes all technical equivalents P5838AU00 which operate in a similar manner to accomplish a similar technical purpose. Terms such as "front" and "rear", "inner" and "outer", "above", "below", "upper" and "lower" and the like are used as words of convenience to provide reference points and are not to be construed as limiting terms.

[0046] The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as, an acknowledgement or admission

or any form of suggestion that prior publication (or information derived from it) or known matter

forms part of the common general knowledge in the field of endeavour to which this specification

relates.

[0047] In this specification the word "comprising" is to be understood in its "open" sense, that is, in the sense of "including", and thus not limited to its "closed" sense, that is the sense of "consisting

only of". A corresponding meaning is to be attributed to the corresponding words "comprise", "comprised" and "comprises" where they appear.

[0048] In addition, the foregoing describes only some embodiments of the invention(s), and alterations, modifications, addition and/or changes can be made thereto without departing from the

scope and spirit of the disclosed embodiments, the embodiments being illustrative and not

restrictive.

[0049] Furthermore, invention(s) have been describe in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover

various modifications and equivalent arrangements included within the spirit and scope of the

invention(s). Also, the various embodiments described above may be implemented in conjunction

with other embodiments, e.g. aspects of one embodiment may be combined with aspects of another

embodiment to realise yet other embodiments. Further, each independent feature or component of

any given assembly may constitute an additional embodiment.

[0050] The reference numerals in the following claims do not in any way limit the scope of the respective claims.

TABLE OF PARTS

Part Item Part Item Apparatus 1 Guide Section 41 Work Aid Component 10 Shield 42 Main Body 12 Attachment Element 45 Ends 13/14 Retaining Element 46 Longitudinal Axis X-X Double Sided Adhesive 47 Profile 16 Double Sided Adhesive 48 Base Wall 18 Structure 60 Inner Side 20 Base Wall 51 Outer Side 21 Opening 52 P5838AU00

InnerEnd 22 Window Frame 55 Outer End 23 Wall Surface 56 InnerArm 25 Lateral Surface 57 Outer Arm 26 Installation 60 Channel 27 Cut-out Section 62 Flange 30 Cover 70 Inner Side 31 Panels 65 Outer Side 32 Eave 66 Weakened Zone 33 Render 75 Junction 34 Groove 36 Locating Section 40

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Claims

1. Apparatus for use in the rendering of building structures, the apparatus comprising at least one work aid component (10) the or each of which includes:

a) an elongated main body (12) having opposed ends (13,14) with a longitudinal axis (X-X)

extending in a direction from one end to the other end;

b) the main body (12) having a cross-sectional profile which includes;

c) a base wall (18) having an inner side (20), an outer side (21), an inner end (22) and an outer

end (23);

d) a laterally extending arm (25) which extends from the inner end (22) of the base wall (18) in a

direction away from the inner side of the base wall;

e) a flange (30) extending from the inner end (22) of the base wall (18) the flange (30) being

substantially collinear therewith;

f) a weakened or frangible zone (33) at a junction of the inner end of the base wall and the

flange and extending in the direction of the longitudinal axis;

g) an attachment element (45) on the outer side of the base wall; and h) a retaining element (46) on the flange.

2. Apparatus according to claim 1 including a further laterally extending arm (26) which extends

from the outer end (23) of the base wall (18) in the same direction and parallel to the other arm, the

two arms and the base wall providing a channel (27) with an open side.

3. Apparatus according to claim 1 or claim 2 wherein the weakened or frangible zone comprises

a notch in the rear side of the junction between the base wall and flange.

4. Apparatus according to any one of claims 1 to 3 wherein the attachment element (45)

comprises double sided adhesive tape (47) on the outer side of the base wall.

5. Apparatus according to claim 4 wherein the adhesive tape is of the PE foam type.

6. Apparatus according to any one of claims 1 to 5 wherein the retaining element (46)

comprises double sided adhesive tape (48) on the inner side of the flange.

7. Apparatus for use in the rendering of building structures, the apparatus comprising at least

one work aid component (10) the or each of which includes an elongated main body (12) for

receiving and or engaging render (74) or a panel (65) to be rendered, the main body (12) having a cross-sectional profile which includes a base wall (18) and at least one laterally extending arm (25)

which extends from the base wall (12) and a flange (30) extending the main body (12) which is, after

rendering has been completed, removeable from said main body (12), said main body (12) being

adapted to attach said apparatus to a surface adjacent to a surface to be rendered, and said flange

(30) including means to hold a cover, to protect a surface adjacent, or near, a surface to rendered.

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8. An apparatus as claimed in claim 7, wherein said main body is attached by any known means

to said surface including one or more than one of the following: double sided tape; adhesive; tack; nail; screw; staple, double sided PE foam tape.

9. An apparatus as claimed in claim 7 or 8, wherein said flange is joined to said main body by a

frangible or breakable or cuttable join.

10. An apparatus as claimed in any one of claims 7 to 9, wherein said flange includes a means to

hold a cover, which means is in the form of double sided tape.

11. Apparatus according to claim 6 o 10 wherein the adhesive tape is of the blue type.

12. Apparatus according to any one of claims 1 to 11 wherein the main body is an extruded

section.

13. Apparatus according to any one of claims 1 to 12 wherein the main body is formed of a

plastics material.

14. Apparatus according to any one of claims 1 to 13 comprising a plurality of said work aid

components arranged end to end.

15. Apparatus according to any one of claims 1 to 14 comprising a plurality of said work aid components arranged relative to one another in a partially enclosed framing array.

16. Apparatus according to any one of the preceding claims, wherein said work aid component

or components are arranged in a fully enclosed framing array.

17. An installation for use in the rendering of building structures, the structure including a first

surface section to which render is to be applied and a second surface section which remains

substantially free of render, there being a boundary between the first and second surface sections,

the installation comprising one or more work aid components according to any one of claims 1 to 16,

the work aid component being positioned on the structure with the laterally extending arm being

substantially aligned with the boundary between the first and second surface sections, and the outer

side of the base wall being secured to the first surface section by means of an attachment element,

the flange of the work aid component extending away from the first surface section.

18. An installation according to claim 17 wherein the flange overlies the second surface section.

19. An installation according to claim 17 or claim 18 wherein the building structure comprises a

wall having an opening therein and a window disposed within the opening and including a window front which is offset from a wall surface to be rendered, a plurality of said work aid components

positioned around the window frame, the outer end of the base wall of each component abut against

a surface of the wall structure, the base wall of each work aid component being secured to part of

the window frame and the flange extending over a further part of the window frame.

20. An installation according to claim 17 or claim 18 wherein the building structure includes an

eave which extends laterally from a wall surface of the structure wherein the work aid component is

mounted in the region of the boundary between the eave and the wall surface, the outer end of the

P5838AU00 base wall abutting against the wall surface and the outer side of the base wall secured to the eave by the attachment element with the flange overlying part of the surface of the eave.

21. A method of rendering a surface of a building structure, the structure including a first surface portion to which render is to be applied and a second surface portion which is not to be rendered, the first and second surface portions being adjacent one another with a boundary therebetween the method comprising the steps of: a) providing one or more work aid components according to any one of claims 1 to 16; b) positioning the work aid component in the region of the boundary between the first and second surface portions of the building structure with the arm being substantially aligned with the boundary; c) attaching the outer side of the base wall to the building structure; d) applying a render to the first portion of the building structure so that the render overlies the base wall and finishes at the arm; and e) thereafter removing the flange from the main body.

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10 X 12 10 25 13 12 25 13 27 13 27 26 26 1 1 1 12 10 1/12

14 14 Fig. 1 14 Fig. 2 Fig. 3 X

13 47 45 33 30 32 23 21 22 12 13 10

10 12 13 20 1 25 31 48 27 18 27 26 Fig. 7 1 12 10 16 27 16 48 2/12

14

Fig. 8 10 45 45 48 Fig. 5 26 25 Fig. 4

Fig. 6 10 14

10B 51 56 50

10B 55 10A 57 52

10B 3/12

62 52 Fig. 1A 55 10A Fig. 9

56 57 Fig. 10

10B

Fig. 11

56 57 4/12 4/12

56 57 10B 55

10A

70 10A

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57

56 75

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30

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