CA1148324A

CA1148324A - Wall cladding system

Info

Publication number: CA1148324A
Application number: CA000383711A
Authority: CA
Inventors: John P. R. Fuhrer
Original assignee: Individual
Current assignee: Individual
Priority date: 1981-08-12
Filing date: 1981-08-12
Publication date: 1983-06-21

Abstract

ABSTRACT OF THE DISCLOSURE
A wall cladding system is provided wherein a wall is faced with rigid insulation having slots on the interior thereof and grooves on the exterior, fastened by mechanical fasteners, which slabs are coated on the exterior with a base coat and thereover a finish coat so as to provide a vapour permeable wall surface.

Description

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WALL CI,ADDING SYSTEM
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BACKGROUND OF THE INVENTION
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This invention relates to the means for cladding walls so as -to provide insulation, vapour permeability and a selected exterior surface thereto.
In the construction of new walls or resurfacing of existing walls of a building, and in most instances, exterior walls, it is common that such walls are insulated, and -that an exterior sur~ace, usually decorative is applied. It is common practice to provide a vapour barrier next to such insulation to prevent the passage of vapour through the wall and systems; such as that shown in United States Patent No. 4,019,296 have been proposed whereby new or existing walls are cladded with sheathing material, vapour barriers and insulation.
Such previous systems, in providing vapour barriers have in practice resulted in fai:lure of wall finishes due to entrapment of vapour. Previous systems have also failed to provide sufficient adhesive or bearing surfaces to ensure proper adhesion for the facing coat.
- SUMMARY OF THE INVENTION
This invention is based on the discovery that vapour permea~ility is desirable in preventing failure of wall finishes and that a simple to apply, long lasting effectlve cladding may be applied to new or existing walls in a manner so as to insulate the wall, provide a good base for adhesion of the finish surface, so as to provide a finished wall surface.
This invention, in one of its aspects, comprises a wall cladding system wherein:
(a) an insulating layer comprising vapour permeable rigid insulation having slots on the interior thereof and indentations an the exterior thereof which insulation is applied to the surface of . "' '~

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the wall by means of mechanical fasteners which pierce the insulation and imbed in the wall while leaving a portion of the ~astener protruding from the exterior surFace of the insulation;
(b) a vapour permeable base coat of material spread over the exterior of ~aid insulation so as to provide adhesion for the finish ; coat; and (c) a vapour permeable finish coat applied over said base coat.
Brief Description of the Drawings The following drawings assist in the description of this invention:
Fi~ure 1: is a schematic cut-away view of a wall to which the cladding of this invention is applied;
is a cross-sectional view of a wall to which the cladding of this invention is applied.
-~ Detailed Description Referring to Figures 1 and 2 there is shown a wall 1, which may be a newly constructed wall, or an existing wall to which a new surface is desired to be applied.
To the exterior surface of this wall there is applied rigid vapour permeable insulation, an example of which is slabs of styrofoam (trade mark3 abutting one another, indicated at 2. Said insulation should be sufficiently rigid so as to permit application to surface thereof of a paste type material. This interior thereof, is slotted to accommodate thermal expansion. On the interior of this insulation there is provided a series of indentations indicated at 3, which may comprise long grooves to permit thermal expansion. On the exterior of ; this insulation there is provided a series of indentations, which may comprise long grooves or discrete indentations or a combination thereof indicated at 4, which indentations assist in the adhesion of the base coat 5, descri~ed later. It will assist adhesion :::; ~ :

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if the interior o~ the indentation is wider than the external opening.
The insulation 2 is affixed to the wall by means of mechanical fasteners 6, which pierce the insulation and imbed themselves into the wall but leave a portion thereof protruding so as to provide further adhesion for the base coat 5. A particularly desirable fastener is one having a su~stantial flat sur-face protruding such as a broad head, or flange or washer so as to provide additional bearing surface for the base coat. Additionally, the broad flat surface may have a series of indentations, whi~h may include holes, to assist in adhesion.
Over the exterior of the insulation 2 there is spread a vapour permeable base coat material 5, which may be any material which will substantially harden and provide a surface to which the finish coat may adhere.
Such a base coat could be of any usual kind such as amentatious or synthetic but it must contain fibres either as discrete fibres or in woven matted or elted form.
A finish coat 7 of vapour permeable material suitable for wall finishing, is then applied on the base coat. Said finish coat may include such material as a binder with pebbles or agglomarates and the like to present an attractive appearance.
In some instances the base coat and finish coat may be one and the same, for instance where no particular finish is required, or where the finish coat is sufficiently adhesive so as to adhere directly to the insulation.
It will be apparent to those skilled in the art that the selection of materials for the insulation, base coat and finish coat, may be made from a broad range of commercially available products, the essential feature being the suitability of such materials for ~ .
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~ 5 -their use in wall cladding, and that they be vapour permeable~
While various enbodiments of the invention are described herein, those skilled in the art will 5 appreciate that variations and modifications thereof may be made without departing from the spirit and scope of this invention.

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Claims

1. A wall cladding system comprising:
(a) an insulating layer comprising vapour permeable rigid insulation having slots on the interior thereof and indentations on the exterior thereof applied to the surface of the wall by means of mechanical fasteners which pierce the insulation and imbed the wall while leaving a portion of the fastener protruding from the exterior surface of the insulation;
(b) a vapour permeable base coat of material containing fibres applied over the exterior of said insulation so as to provide adhesion for the finish coat;
(c) a vapour permeable finish coat applied over said base coat.

2. A wall cladding system as described in claim 1 wherein no finish coat is applied.

3. A wall cladding system as described in claim 1 or 2 wherein the mechanical fastener is provided with a substantial flat surface protruding from the exterior surface of the insulation, and having a series of indentations on said flat surface to assist adhesion to said surface.

4. A wall cladding system as described in claims 1 or 2 wherein the interior of the indentation is wider than the external opening.

5. A wall cladding system as described in claim 1 or 2 wherein the mechanical fastener is provided with a substantial flat surface protruding from the exterior surface of the insulation, and having a series of indentations on said flat surface to assist adhesion to said surface and the interior of the indentation is wider than the external opening.