GB2111095A

GB2111095A - Wall Tie

Info

Publication number: GB2111095A
Application number: GB08223266A
Authority: GB
Inventors: Pater Stanbury Salmond; James Gilmour Martin; Alastair Maxwell Richmond
Original assignee: GLASGOW STEEL NAIL Co LIM
Current assignee: GLASGOW STEEL NAIL Co LIM
Priority date: 1981-08-12
Filing date: 1982-08-12
Publication date: 1983-06-29

Abstract

A wall tie which is adapted to secure an insulation board within a cavity wall, comprises an elongate body (1) and extending therefrom projections (5,6) which are sufficiently sharp as to be able to penetrate the insulation boards (15,16) and whose location on the body is such that the insulation board can be positioned within the cavity wall by impaling the insulation board upon the projection. The projections are preferably located towards one end of the elongate body of the tie to suit the positioning of the insulation board. <IMAGE>

Description

SPECIFICATION Modified wall tie This invention relates to the insulation of cavity walls using insulation boards which are located within the cavity and retained in position by virtue of a modified wall tie. More particularly this invention provides a suitably modified wall tie for this purpose.

The rising costs of energy over recent years have led to an increase in the standard required of insulation against heat loss for walls of new buildings.

In order to meet these requirements it is becoming increasingly popular to utilize a cavity wall construction containing an insulation material in the form of a board. These boards have to be supported within the cavity in order to provide a uniform insulating medium.

A previous proposal for providing this support for such boards involved the use of a vertical twist type of wall tie provided with a transverse pin either integral with the tie or locatable within an aperture in the tie so that following positioning of the tie, an insulation board may be located such that the pin presses against the outer face of the board and thus retains it in position.

Difficulties may be encountered with this however, in that slight manufacturing defects cause some pins to be fixed at awkward angles with resultant difficulties in fitting of the insulation boards, whilst other pins fall out of the tie rendering the tie useless.

An alternative proposal called for the use of a wire tie upon which a slotted locking disc could be located after the tie was fixed to a portion of the cavity wall. In use, this disc is fixed against the outer face of a board so as to maintain the board in abutment with the inner cavity wall.

A disadvantage of this proposal is that, in constructing a cavity wall using this type of tie, the inner wall has to be built in advance of the outer wall to allow the bricklayer to have access to the ties to fit the insulation board and locking disc. Further it is possible to lose discs by dropping them down the cavity during construction.

It has also been found that misuse of ties, by bending of the free end to hold the upper edge of a board untii the outer wall is built level with this edge, occurs.

Therefore, it can be seen that both of these methods are in some ways inconvenient and it is an object of the present invention to obviate or mitigate the aforementioned disadvantages.

According to the present invention there is provided a wall tie which is adapted to secure an insulation board within a cavity wall, comprising an elongate body and extending therefrom a projection which is sufficiently sharp as to be able to penetrate the insulation board and whose location on the body is such that the insulation board can be positioned within the cavity wall by impaling the insulation board upon the projection.

Preferably, the projection is located towards one end of the elongate body of the tie to suit the positioning of the insulation board.

Regarding the elongated body of the tie as lying in a horizontal plane, the projections conveniently comprise an upstanding projection and adjacent thereto a depending projection so that in use superposed boards may be impaled upon the tie and thus secured in position.

The present invention also provides a method of constructing a thermally insulated cavity wall comprising the steps of providing a plurality of wall ties, which are adapted to penetrate a board of insulating material, in a double course of bricks and impaling an insulation board upon these wall ties.

The invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a perspective view of a vertical twist type of wall tie adapted according to the invention; Figure 2 is a vertical section through a cavity wall showing the wall tie illustrated in Fig. 1 in position; Figure 3 is a perspective view of a double triangle type of wall tie adapted according to the invention; Figure 4 is a vertical section through a cavity wall showing the wall tie illustrated in Fig. 3 in position; Figure 5 is a perspective view of a butterfly type of wall tie adapted according to the invention; and Figure 6 is a vertical section through a cavity wall showing the wall tie illustrated in Fig. 5 in position.

Example 1 In a first embodiment of the invention, a vertical twist wall tie comprises an elongate body portion 1 formed from a strip of stainless steel or galvanized mild steel having bifurcated end portions 2 and 3, a vertical twist portion 4 and projections 5 and 6.

The projections 5 and 6 are conveniently cut out of the strip of steel and bent to form one upstanding projection 5 and adjacent thereto a depending projection 6, leaving apertures 7 and 8 in the strip.

In Fig. 2 this strip can be seen in use in a cavity wall which comprises an inner wall 10 and an outer wall 11 constructed from bricks 1 2 and mortar 1 3 to define a cavity 1 4.

Bifurcated end portions 2 and 3 of the tie are embedded in the mortar 1 3 to fix the tie in position so that the projections 5 and 6 are nearest the inner wall 1 0. Insulation boards 1 5 and 1 6 are shown impaled upon the projections 5 and 6 so that they are flush against the inner wall 10.

Example 2 In a second embodiment of the invention, referring now to Fig. 3, a double-triangle type of wall tie comprises an elongate body portion 21 formed from a length of stainless steel, or galvanized mild steel wire and having triangular end portions 22 and 23, a drip point 24 and projections 25 and 26 which are conveniently fashioned from one end of the steel wire.

In Fig. 4 a vertical section through a cavity wall similar to, and identified by the same numerals as, that in Fig. 2 has a wall tie of the type shown in Fig. 3 to support the insulation boards.

Example 3 In a third embodiment of the invention, as shown in Fig. 5, a butterfly-type of wall tie comprises a length of stainless steel or galvanized mild steel wire formed into a pair of substantially triangular shapes 32 and 33 intercepting at their apexes to give an elongate body 31. The free ends of the wire are twisted about the intercept of the triangular shapes to provide opposed projections 35 and 36 one of the triangular shapes 33 is provided with drip points 34.

Fig. 6 shows such a tie in place in a cavity wall which, as before in Figs. 2 and 4, is shown in section.

Example 4 In a fourth embodiment of the invention, as shown in Fig. 7 a wall tie comprises an elongate body portion 41 formed from a strip of stainless steel, having bifurcated end portions 42 and 43, a 2 twist 44 and projections 45 and 46.

The projections 45 and 46 are formed from a stainless steel pin which is fitted into an aperture 49, conveniently by a wedging or friction fit, during manufacture. This tie can be used in an analogous fashion to those described in Examples 1 to 3 above.

Examples 5 A method of constructing a cavity wall which is thermally insulated using boards comprises laying a double course of bricks, coating the upper face of the bricks with mortar, embedding a wall tie provided with projections which are adapted to penetrate a board of insulating material in the mortar so that the projections are nearest the inner course of bricks, continuing construction of the double wall over the ties until reaching a height equivalent to the height of one insulation board, lowering a board into the cavity between the double wall whilst keeping it flush with the inner wall, pressing firmly down upon the board when contact with the ties is made so that it becomes impaled upon the projections.

Advantageously, the upper edge of the board then has the next layer of ties pressed into it from above as the process is repeated thus securing the positioning of the board.

By repeating the above steps, a cavity wall may be completed in a simple and efficient manner.

This method cuts costs by reducing both the number of components required and the labour time on site. It also reduces the risk of misalignment of boards during construction.

Further, no bending of any tie is required during installation of the boarding.

It is also convenient from the builder's point of view in that both layers of brickwork forming the hollowing cavity wall can be built at the same time.

Most ties presently in use can provide a basis for a modified tie according to this invention, thus existing materials and specifications may be utilized to meet all required standards of the building industry.

Claims

1. A wall tie which is adapted to secure an insulation board within a cavity wall, comprising an elongate body and extending therefrom a projection which is sufficiently sharp as to be able to penetrate the insulation board and whose location on the body is such that the insulation board can be positioned within the cavity wall by impaling the insulation board upon the projection.

2. A wall tie according to claim 1 wherein the projection is located towards one end of the elongate body of the tie.

3. A wall tie according to claim 1 or claim 2 wherein the elongate body has an upstanding projection and a depending projection adjacent thereto.

4. A wall tie substantially as hereinbefore described in any one of the Examples 1 to 4 with reference to and as shown in Figs. 1 to 7 of the accompanying drawings.

5. A method of constructing a thermally insulated cavity wall comprising the steps of providing a plurality of wall ties, which are adapted to penetrate a board of insulating material, in a double course of bricks and impaling an insulation board upon these wall ties.

6. A method of constructing a thermally insulated cavity wall substantially as described in Example 5 hereinbefore.