Note: Descriptions are shown in the official language in which they were submitted.
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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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-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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