AU617008B2

AU617008B2 - Veneering system

Info

Publication number: AU617008B2
Application number: AU42685/89A
Authority: AU
Inventors: Anthony Austin Golding
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-10-06
Filing date: 1989-10-06
Publication date: 1991-11-14
Anticipated expiration: 2009-10-06
Also published as: AU4268589A

Description

PATENTS ACT 1952 COMPLETE SPECIFICATION

(ORIGINAL)

617 00 8 FOR OFFICE USE: Application Number: Lodged: Class Int. Class Complete Specification Lodged: Accepted: Published: Priority: .00, Rffifedf Art: Nainr.of Applicant(s): Adffess~of Applicant(s): 00 a 00 ANTHONY AUSTIN GOLDING 21 Camfield Road, Greenmount, Western Australia, AUSTRALIA.

0 C 0 0 0000 Aa'Mal 0 Ipwentor(s): ANTHONY AUSTIN GOLDING 0 a,' a 000 C) Address f -or Servicec: Kelvin Lord Co., 4 Douro Place, WEST PERTH, Western Australia 6005.

Complete specification for the invention entitled: "VENEERING SYSTEM"r The following statement is afull description of this invention, including the best miethod of performing it known to me/us

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2 o 1 roo p o o t 0 B 0 0 00« a o o So~o P BE s e- e 0 00 0 0 08 0 o0 0 Se 0 a 0i 0000 a ft a0s o 0 o 0 o B t 0 0 9 600f The present invention relates to a veneering system for buildings.

The present invention is particularly intended for use on buildings already provided with wall board panels.

In accordance with one aspect of the present invention there is provided a method for providing a veneer on buildings which comprises adhering a cloth layer to a cladding of a building, impregnating the cloth layer with a curable material and allowing the curable material to cure to form a 10 veneer sheet on the building.

In accordance with a further aspect of the present invention there is provided a building having a veneering system applied to a wall in accordance with the method of the present invention.

The present invention will now be described, by way of example, with reference to the- accompanying drawing which is a cross-sectional side view of part of a wall incorporating the veneering system of the present invention.

Shown in the drawing is a veneering system 20 The veneering system 10 comprises a layer of cloth 12.

The system 10 further comprises a gap 14 located between two edges 16 and 18 of two adjacent, aligned panels of cladding and 22 respectively. As may be seen, the cladding 20 and 22 underlies the cloth 12.

The cladding 20 and 22 is attached to a stud 24 typically by means of nails or screws 26.

Overlaying the cloth 12 there may be a textured finishing layer 28, typically a high build paint based product or cement/sand render incorporating an. acrylic emulsion binder.

The gap 14 is, prior to application of the cloth layer 12, filled with a flexible, water repellant sealant which provides poor adhesion to water based adhesives.

Further, a layer of water based adhesive is applied to the cladding 20 and 22. Subsequently, the cloth layer 12 is adhered to the cladding 20 and 22 by the layer adhesive.

Preferably, the gap 14 between the edges 16 and 18 is at least 3mm in width and typically of the order of 5mm in width.

The sealant in the gap 14 may be a silicone rubber recommended for cementitious substrates or a polysulphide rubber such as Thioseal 5000.- Preferably, the sealant provides a poor interface adhesion with water based adhesives such as acrylic, polyvinylacetates (PVA) or other resin emulsions.

Preferably, the cloth 12 is formed of a flexible, synthetic fibre such as polyester, polyethylene or polypropylene based fibre cloth suitable for exterior use.

4 4 Preferably, the cloth 12 has a tightly closed matrix with a large number of small threads which imparts added strength to the end product. The cloth preferably has a thickness of I at least 1.5mm, to provide an end product with sufficient strength and knock resistance. Preferably, the cloth 12 is not an open weave or knitted cloth.

Preferably, the cloth 12 readily absorbs curable materials so that complete migration of the curable material occurs through the cloth 12 when applied to one side only.

The curable materials are preferably water based emulsions such as acrylic, PVA or other resin emulsions as these are 4 more environmentally acceptable, are easier to apply, are less expensive and will stand aging better than non water based products.

Preferably, the cloth 12 is such that it may be cut in any direction with minimal fraying.

Typically, such a cloth is a polyester continuous filament needle bonded non-woven geotextile, as manufactured by Geofabrics Australasia.

Further, it is preferred that,, when cured, the curable material impregnated with the cloth produces a sheet which is flexible and capable of free standing when not adhered to the cladding 20 and 22. The free standing capability is a S measure of the resistance of the sheet to bubbling and creasing in use. That is, a free standing sheet is more resistant to these problems than a non-free standing sheet.

Preferably, the cured sheets are substantially resistant to creasing or bubbling at locations where it is poorly adhered to the sealant in the gaps 14 between the cladding sheets and 22.

•Preferably, the cured sheets will not split when bent through 180-, which indicates that the sheets will not tend to become a brittle mass upon aging.

Preferably, joints of the cured sheet do not coincide with joints r.f the cladding sheets 20 and 22.

Preferably, the cured sheet and the layer 28 have a thickness between 2mm and 5mm so as not to interfere with margins at architraves.

In use, cladding 20 and 22 is affixed to a stud 24 in known manner, typically by way of nails or screws 26.

o 00 o o 9 00 0 Os 0 o to 0 l 0 0000 o oa The gap 14 between the edges 16 and 18 is then filled with the sealant as described above.

Any planimetry difference in excess of about 1.0mm between the cladding 20 and 22 may be then faired with a fairing relatively (not shown) to achieve a relatively level surface. This step is desirable when finishing with a high build paint based products. However this step is not usually necessary when finishing with a sand/cement render.

Suitable fairing compounds are cementitious based compounds incorporating compatible adhesives or acrylic based compounds.

The cloth 12 is then adhered to the cladding 20 and 22 using an adhesive suitable for prolonged exterior exposure such as the water based acrylic or PVA based emulsions described 15 above.

The cloth 12 is then impregnated with a resin such as a water based curable acrylic, PVA or other resin emulsion.

Preferably, the cloth 12 is such that the acrylic PVA or other resin emulsion migrates through the cloth 12 and impregnates it. A typical impregnation rate is of the order of 1 litre/m The cloth 12 can be impregnated by the use of a spray, brush or roller.

The emulsion impregnated into the cloth 12 then cures such that a skin is formed on the building in close conformity with the shape of the building. Further, the skin may be water proof and tough which could not be achieved by the use of cloth only. The system of the present invention is especially intended for external use but it may also be used internally. When used externally, the system of the present

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i 6 invention is particularly envisaged for use with batten free wall board panels such as fibro cement panels or weather resistant wood or resin based panels.

The textured finishing layer 28 may be applied to the cured cloth layer in known manner.

In a preferred embodiment of the present invention, the cloth layer 12 is simply laid in strips along joints in the cladding rather than over the whole of the cladding. The strips should preferably be at least 300mm wide such as about 500mm. Also, the strips are preferably laid with equal width on each side of the joint i.e. 250mm in the case of a 500mm wide strip. This embodiment is preferably used where a cement render finish is applied to the system. If 4 1the cloth strips were too narrow cracking could be induced by movement in the joint so the width of the cloth strips is to be sufficient to avoid this. Apart from this limitation a the use cloth strip with a cement render finish has been 00 found to be highly effective. The use of the cement render o finish disguises the edges of the cloth strips in the 20 finished veneer.

The present invention provides for the removal of unsightly planimetry differences between butt joints of fixed panels or slightly protruding screw or nail heads.

The system of the present invention can provide a weatherproof seal at the butt joints, and at the external and internal angles of the cladding panels.

Further, a tough knock resistant skin offering a high impact rupture resistance and the ability to resist loosely fixed nails or screws working through the finished surface is -7- 7 provided by the system of the present invention.

An improvement to the insulation properties of the cladding is also affected by the system of the present invention.

Also, the use of the method of the present invention avoids the need to use wall board panels provided with recessed edges.

Modifications and variations such as would be apparent to a skilled addressee are deemed within the scope of the present invention.

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Claims

2. A method according to Claim i, in which the cloth layer is formed of a flexible, synthetic fibre.
3. A method according to Claim 2, in which the cloth layer is a polyester continuous filament needle bonded non-woven geotextile.
4. A method according to any one of the preceding Claims, in which the cladding comprises one or more gaps between adjacent, aligned panels, wherein the or each gap is filled with a flexible, water repellant sealant which provides poor adhesion to water based adhesives. A method according to Claim 4, in which a layer of water based adhesive is applied to the cladding and the cloth layer is subsequently adhered to the cladding by the 20 layer of adhesive.
6. A method according to Claim 4 or 5, in which the curable material is a water based resin emulsion.
7. A method according to Claim 6, in which the curable material impregnates the cloth layer by being applied to one side of the cloth layer subsequent to adherence of the cloth layer to the cladding. ii
8. A method according to any one of the preceding Claims, in which the cloth layer is impregnated with the curable material such that the cloth layer is capable of free 9 standing.
9. A method according to any one of the preceding Claims, Jt wherein the cured cloth layer is capable of being bent .i Nthrough 180° without splitting.
10. A method according to any one of the preceding Claims, in which joints of the cloth layer do not coincide with Sjoints of the cladding.
11. A method according to any one of the preceding claims in which the cloth layer is laid in strips along joints in the cladding. o 12. A method according to any one of the preceding Claims, }1 iin which a textured finishing layer is applied to the cured ,jl a cloth layer. ,13. A method of providing a veneer on a building substantially as hereinbefore described with reference to the accompanying drawings. S14. A building having a veneering system applied to a wall 1 in accordance with the method of any one of the preceding i Claims. a° 20 DATED OCTOBER 5 1989 ANTHONY AUSTIN GOLDING By his Patent Attorneys KELVIN LORD AND COMPANY PERTH, WESTERN AUSTRALIA.