Termite control

Abstract

A barrier to termites particularly suitable for protecting buildings comprising a mesh made of a material that is resistant to breakdown in the environment of use and is resistant to secretions deposited by termites, such as stainless steel, and is also sufficiently hard to not be attacked by termites, such as having a hardness not less than about Shore D70. The pores of the mesh being dimensioned so the maximum linear dimension in any direction of the pores is less than the maximum linear dimension of the cross-section of the head of the species of termite to be controlled.

Description

This is a For instance, the soldier termite of species Mastotermes darwiniensis, of northern Australia, has a maximum head width of 3.25 mm. To form a termite barrier for Mastotermes darwiniensis, the distance between the two more closely spaced sides 16 of the rectangle and the diagonal thereof should be 3.25 mm or less.

Referring now to FIG. 3 which shows a cross section of a portion of a building having an external double brick wall 20 and an internal single brick wall 21 in association with a poured concrete slab base 23. As is conventional in this form of construction, a continuous concrete footing 25 is formed to support the double brick wall 20. The perimeter of the concrete slab 23 has a perimetal portion 26 of increased depth also supported on the footing 25, and additional areas of increased depth are also provided beneath the internal single brick walls 21 as indicated at 28 in FIG. 3.

After the footings 25 have been poured and cured, an integral sheet of termite barrier mesh 30 is laid over the complete area where the slab 23 is to be poured with portion of the mesh overhanging beyond the footing 25 as will be referred to further hereinafter. When the mesh 30 is laid it is contoured to closely follow the contour of the ground including following the contour of any trenches or depressions in the ground, such as are required to accommodate the increased thickness areas 26 and 28 of the concrete slab. Because the termite barrier is in the form of a wire mesh, it can be readily deformed to follow these contours, and can be readily folded where there is excess material resulting from a change in the contour of the surface over which it is being laid. Where a pipe or duct such as indicated at 31 is required to pass through the slab 23, an appropriately located aperture is cut in the mesh 30 and the edge of the mesh clamped about the pipe or duct as hereinafter further described with reference to FIG. 4.

For convenience in handling, the mesh is produced in rolls of a convenient width such as 5 m, and the mesh is laid in position with the edges of adjacent strips overlapped and secured together in a multi fold lap-type joint wherein as each fold is made it is hammered or rolled flat throughout its length to provide a secure and permanent join that is termite-proof.

After the strips of mesh have been placed in position and effectively secured along the overlapping edges, and the form-work for the concrete slab 23 is in position, the slab is poured in the conventional way with conventional steel reinforcement therein and a moist barrier sheet therebeneath (not shown). After the elapse of the appropriate curing time, the commencement of the erection of the external double brick wall of the building can be undertaken. In regard to the double brick wall construction as seen in FIG. 3 at 20 the overhanging edge portion 30a of the termite barrier mesh is folded upwardly so as to lie between the respective inner and outer layers of bricks. The outer layer 20a of bricks is built up to a level of at least 10 cm conveniently between 20 to 30 cm above the surrounding ground level, then the upper edge portion 30 of the barrier mesh is bent outwardly over the bricks forming the outer layer and thereafter, the rest of the bricks of the outer and inner wall are built up in the conventional manner.

There is thus formed a complete barrier in the perimeter double brick wall which is continuous with the barrier beneath the concrete slab to prevent the entry of termites into the interior of the building.

As an alternative, as shown in FIG. 5, the barrier mesh 30 projects outwardly beneath both layers of the double brick wall and is then bend upwardly as indicated at 30 against the external face of the perimeter wall. If desired, the barrier mesh at the upper end is folded and entered between two layers of bricks at a level of 10 or more cm above the ground level. Each of the above alternative constructions may be used in other forms of external wall constructions such as a timber framed inner wall and a brick outer wall. Also the construction shown in FIG. 5 may be used with a single timber framed external wall.

Where a conduit, such as 31 in FIG. 3 previously referred to, projects through the concrete slab 23, the barrier mesh has an aperture cut therein and prior to pouring the slab of the size smaller in diameter than the duct to be passed therethrough. The mesh about the periphery of the hole so formed can then be stretched and formed into an upwardly or downwardly projecting flange 35 as seen in FIG. 4 and a clamp 36 is fitted around the flange to press it firmly into engagement with the external surface of the duct 31. The clamp 36 may conveniently be in the form of a conventional stainless steel hose clamp.

Preferably the flange 35 is formed to project upwardly from the normal level of the barrier mesh as shown in FIG. 4 so that when the slab is cast, the flange and the clamp secured about the duct will be embedded in the concrete forming the slab. It will be appreciated that a woven mesh is capable of being stretched without enlarging the holes or pores therein to a size to permit termites to pass through. The stretching is achieved by distorting the rectangular pores into a parallelogram shape thus reducing the dimensions of the pores in one direction while they are enlarged in the other direction. The reduction in one direction is sufficient to prevent the passage of termites.

Referring now to FIG. 6 of the drawings, there is shown in a simplified representation, a cross section through part of the slab and wall of a building. The footing 9 is constructed of concrete with appropriate metal reinforcement and is located some distance below the normal surface of the ground indicated at 11. The concrete beam 12 is normally precast and located on site in position on the footing 9, a series of such beams being provided to form the perimeter of the base of the building. As the beams 12 are precast and subsequently transported to the building site, it is not convenient to have barrier material embedded in the beam during the casting thereof, particularly as there is the possibility of damage to the barrier material during subsequent transportation and installation of the beams.

Following completion of the positioning of the perimeter beams 12 in place upon the footings, the area bounded by the beams is prepared for pouring of the concrete slab by the laying down and compacting of a bed of stones as indicated at 13 prior to the pouring of the full slab. Also prior to pouring of the slab, a continuous strip 15 of the termite barrier material is arranged so one marginal edge portion 16 is applied to the internal face of the beam 12 by appropriate mechanical fixings such as concrete nail and is overlayed by an adhesive cement layer as indicated at 17. After curing of the adhesive cement, the concrete floor slab 19 is poured and during such pouring the other marginal edge portion 18 of the barrier material strip 15 is embedded in the concrete slab.

The concrete of the slab may extend up to and abut the internal face of the beam 12, thereby also encasing the marginal portion 16 of the termite barrier strip that is adhered to the beam, or in alternative structures, an expansion gap, may as indicated at 22 be left between the perimeter edge of the slab 18 and the adjacent beam 12. Where such an expansion gap is left, as seen in FIG. 6, the barrier strip is provided with a re-entrant fold 21 extending the length thereof which will provide the flexibility and freedom for movement of the floor slab relative to the beam without the risk of fracture of the termite barrier strip. As shown in FIG. 6, the marginal edge position 18 extends into the slab through the edge face thereof. However, it is to be understood that the termite barrier step may also extend into the underside of the slab with the marginal portion then turned upwardly into the under side of the slab.

It is also to be understood that the beam 12 as shown in FIG. 6 can be replaced by a cast in situ or precast wall or similar upwardly extending member. In such an arrangement the barrier strip can be installed as shown in FIG. 6 or each marginal edge portion of the barrier strip 15 can be embedded in the slab and upright member respectively during casting of each or can be embedded in one and adhered or bonded to the other. In constructions where the slab and other member are cast separately, it is preferable to provide a re-entrant fold 21 24 extending the length of the barrier strip 15 to provide the ability for limited freedom of movement between the structural members without fracture of the barrier strip.

The above description of the installation of the termite barrier strip between a beam or wall and a slab may also be applied to providing an effective termite barrier between an existing concrete member and a newly cast member which may be functioning as an extension of an existing structure. In such circumstances, the same technique and layout as above discussed with respect to the beam and slab, may be applied to extending an existing slab.

Referring now to FIG. 8 of the drawings where there is illustrated a further application of the termite barrier strip along the external perimeter wall of an existing building. In this situation as illustrated, the existing building comprises a conventional footing 25, a floor slab 26 and an external wall 27, which may be in the form of a brick or poured concrete construction. In such an existing structure, there is not access to the underside of the slab 26 or the interface between the slab 26 and the wall 27 and accordingly, it is necessary to install the termite barrier strip externally. This is achieved by initially removing the earth adjacent the external wall to a depth to expose the existing concrete footing and then applying the barrier material strip 28 extending up the external face of the wall from the footing to a substantial distance above the ground level. The lower marginal edge of the termite barrier strip, which is seated on the footing 25, is secured thereto and to the lower portion of the wall by suitable adhesive cement as indicated at 29. The upper marginal portion of the termite barrier strip may be anchored to the wall by concrete nails or the like at suitable intervals along the length, or may also be secured thereto by the use of adhesive cement or both. In this regard, it is to be noted that in view of the inability of the termites to survive when exposed to ambient conditions, it is only necessary for the termite barrier strip 15 to extend approximately 20 to 30 centimeters above normal ground level to effectively prevent termites entering the building or to cause them to build external galleries that are readily visible and hence detectable.

There is shown in FIG. 7 a modification of the construction shown in FIG. 8 which is suitable for use during the construction of the building as compared with that shown in FIG. 7 which is more appropriate for application to existing buildings. In FIG. 7, the conventional footing 25, floor slab 26 and external wall structure 27 are the same as that previously described with respect to FIG. 8. The termite barrier strip 28 has a lower portion thereof embedded into the slab 26 during the pouring of the latter and is subsequently positioned so as to lie adjacent the wall 27 on the inner side thereof. During the laying of the bricks or blocks 29 which form the wall 27, the other marginal edge portion of the barrier strip 28 is positioned between two adjacent bricks or blocks with the normal mortar or cement is located on either side of the marginal edge portion of the barrier strip so that when the wall is finished, the marginal edge portion is integral with the wall structure and will prevent the passage of termites.

It is to be understood that the term bricks or blocks includes building blocks of a range of materials including natural stone, rock, concrete and the brick or block may be of steel or aluminum in block or sheet form.

As previously referred to with respect to FIG. 4, it is frequently necessary in building structures to provide conduits which project through the concrete base slab of the structure, and the opening provided in the slab for this purpose is a potential avenue for the passage of termites. In order to preclude the passage of termites, a sheet 34 of border material with a central aperture can be placed over the conduit 31 prior to the pouring of the slab with the inner peripheral portion of the sheet clamped above the exterior of the conduit such as by a conventional hose clip as indicated at 35 in FIG. 9. During the subsequent pouring of the slab, the outer perimeter areas 33 of the sheet of termite barrier material is embedded in the concrete when poured and thereby provide an effective barrier to termites between the conduit and the slab as commonly arises in the prior art structures.

In the previous description of the practical application of the present invention, reference has been made to using adhesive cement to secure a marginal edge portion of the barrier strip to an adjacent member which may be concrete or building bricks or blocks. The nature of the adhesive cement is a mixture of conventional cement and fine sand to which there is added a proprietary cement adhesive agent, such as that marketed in Australia under the Registered Trade Mark BONDCRETE. The sand used in the adhesive cement is selected so that it is sufficiently fine that the individual particles will freely pass through the openings in the mesh of the barrier strip thereby ensuring an effective bond between the barrier strip and the adjacent structural member and to prevent the possible formation of areas which are not adhered and therefore potential passages for termites.

The termite barrier material used as above described in relation to building may also be used as a termite barrier in respect of a wide range of structures incorporating material which is subject to attack by termites. One such additional application is around the portion of a post or like member which has the lower portion thereof buried in the ground. It is customary to treat the lower portion of such posts with appropriate chemicals to inhibit attack by termites, however, such chemicals have a limited effective life and environmental disadvantages. The termite barrier material of the present invention can be formed into a sleeve or pocket 38 closed at one end 39 and fitted over the portion of the post to be buried in the ground with the closed end lowermost as shown in FIG. 11. The sleeve is of sufficient length to project at least 10 to 20 centimeters above the ground level when the post is erected.

When the barrier mesh is to be used for this purpose, it may be initially woven in a tubular form and then cut to the requisite length for each particular application. The individual lengths of the tubular mesh are then folded at the bottom end to form an effective closure. This closure may be formed by flattening a portion of the end of the tube and then forming multiple folds therein with the folded portion being subsequently pressed or hammered flat to form a multi lapped joint which is not penetrable by the termites.

When the mesh is not produced in a tubular form, a flat piece of mesh may be rolled to form a tube with the respective edges of the strip folded in a multi lapped Joint which is again rolled or hammered flat.

In the above description the application of the termite barrier material to the lower end of a post it is to be understood that the same construction of termite barrier can be used on any member which is to be buried in the ground, whether it is in the nature of or forming the function of a post or for any other purpose.

Another use for the termite barrier material is in protecting cables, particularly underground cables which incorporate a material which is susceptible to attack by termites. Such cables normally are of a construction as shown in FIG. 10 and have an outer protective covering 40 of a suitable material in addition to the wires or other elements 41 of the cable, such as electrical or optical cable, and the normal insulation or other coatings or wrappings 42 in which they are located.

It is known to weave in situ about the core of such cables fabric or wire reinforcing materials and it is proposed by the present invention that there also be woven about such cable cores a mesh of stainless steel wires or filaments 43 of the required dimensions to form a barrier against the passage of termites into the cable. If the termite barrier is not woven in situ about the core of the cable, then a wrapping of the barrier material of the required construction may be fitted about the cable with a longitudinal seam being formed by a lapped joint in the manner previously discussed. The termite barrier is located in or beneath the outer tough covering normally provided on such cables, as an alternative to about the exterior as shown in the drawing.

The termite barrier as previously described may be used in many other applications in addition to those described with reference to the accompanying drawings without departing from the present invention.

Claims

1. A termite barrier which is substantially resistant to termite chewing and corrosion, the termite barrier comprising; a mesh sheet formed of a material resistant to breakdown in the environment of use and substantially resistant to termite secretions, said material having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh sheet having pores wherein each pore has a linear dimension in all directions less than the maximum linear dimension of the cross section of the head of the species of termite to be controlled , wherein the pores are open to permit fluid flow therethrough, the pores having a maximum opening dimension less than 3.25 millimeters, the mesh sheet being positioned in relation to a structure and ground underneath the structure to provide a termite barrier for the structure.

2. The termite barrier as claimed in claim 1, wherein the pores of the mesh sheet have a linear dimension in at least one direction, less than the minimum lineal dimension of the cross section of the head of the species of termite to be controlled of not more than 0.85 mm.

3. The termite barrier as claimed in claim 1, wherein the pores of the mesh sheet are polygonal with the maximum diagonal information less than the maximum linear dimension of the cross section of the head of the species of termite to be controlled 3.25 mm.

4. The termite barrier as claimed in claim 1, wherein the pores of the mesh sheet are rectangular in shape.

5. The termite barrier as claimed in claim 4, wherein the rectangular pores each have a diagonal dimension less than 0.85 mm.

6. The termite barrier as claimed in claim 4, wherein the rectangular pores are dimensioned 0.40 mm by 0.70 min mm.

7. The termite barrier as claimed in claim 1, wherein the mesh sheet is made of a corrosion resistant grade of stainless steel.

8. The termite barrier as claimed in claim 1, wherein the mesh sheet is bonded to or embedded in a moisture impervious sheet.

9. In combination with a building structure erected on a ground level concrete slab, a termite barrier which is substantially resistant to termite chewing and corrosion, the termite barrier comprising:

a mesh sheet made of a material substantially resistant to termite secretions and having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh sheet having pores wherein each pore has a linear dimension in all directions less than the maximum linear dimension of the cross-section of a head of a species of termite to be controlled , the pores having a maximum opening dimension of less than 3.25 mm, the termite barrier being positioned beneath an underside of the slab and extending to a perimeter of the slab in all directions and upwardly about the perimeter of the slab to a distance above the slab and above the ground level adjacent thereto.

10. The combinations combination as claimed in claim 9, further comprising a member projecting through the termite barrier and the slab, and a termite barrier sleeve integral with the termite barrier located beneath the slab and clamped in pressure engagement therewith about the perimeter of the member.

11. The combination as claimed in claim 10, wherein the sleeve is formed by cutting an opening in the termite barrier, said opening having a perimeter less than the perimeter of the member and stretching and deflecting the marginal area of termite barrier about the opening to form the sleeve.

12. A cable having a core of conductive member or members, and a protective covering surrounding the core, said covering including a termite barrier which is substantially resistant to termite chewing and corrosion, said termite barrier surrounding said core and comprising a mesh layer formed of a material substantially resistant to termite secretions and having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh sheet having pores wherein each pore has a linear dimension in all directions less than the maximum linear dimension of the cross-section of a head of a species of termite to be controlled 3.25 mm.

13. In combination, a foundation structure for supporting a building, a termite barrier which is substantially resistant to termite chewing and corrosion for shielding the foundation structure to protect the building from termite invasion, the termite barrier comprising a mesh sheet formed of a material resistant to termite secretions and having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh sheet having open pores wherein each pore has a linear dimension in all directions less than the maximum linear dimension of the cross-section of a head of a species of termite to be controlled permitting fluid flow therethrough, each open pore having a maximum opening dimension of less than 3.25 mm, the termite barrier covering the foundation structure to protect the building supported thereon against termites.

14. In combination with a building structure erected on a ground level or near ground level concrete slab, having a non integral termite resistant adjacent structure, a strip of termite barrier material which is substantially resistant to termite chewing or corrosion, the termite barrier material comprising; a mesh sheet made of a material substantially resistant to termite secretions and having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh sheet having pores wherein each pore has a linear dimension in all directions less than the maximum linear dimension of the cross section of a head of a species of termite to be controlled, the mesh sheet having pores wherein each pore has a maximum opening dimension of less than 3.25 mm, said strip of termite barrier material having respective marginal edge portions along opposite longitudinal edges of the strip integrally secured to the slab and the adjacent structure to establish integrity of the connection between the slab and the adjacent structure against the passage of termites.

15. The combination as claimed in claim 14, wherein the adjacent structure is a further concrete structure.

16. The combination as claimed in claim 14, wherein the adjacent structure is composed substantially of a building material selected from the group consisting of brick, natural stone, rock, concrete block, steel and aluminum in block or sheet form.

17. The combination claimed in claim 14, wherein the slab and the adjacent structure are each cat cast in-situ concrete components, the respective marginal edge portions of the termite barrier strip being embedded into the slab and adjacent structure during the pouring of the concrete.

18. The combination claimed in claim 14, wherein the slab and adjacent structure are each preformed and the combination further comprises an adhesive resistant to attack by termites for bonding the marginal edge portions of the strip of termite barrier material to the slab and adjacent structures structure.

19. The combination claimed in claim 18, further comprising a mechanical fastener for additionally securing the respective marginal edge portions of the termite barrier strip at spaced intervals along the length thereof.

20. A post or column to be erected with an end portion thereof embedded in the ground, said end portion being enclosed in a protective sleeve closed at one end, said sleeve being made from a mesh sheet of a material substantially resistant to termite secretions and having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh sheet having pores wherein each pore has a linear dimension in all directions less than the maximum linear dimension of the cross section of a head of a species of termite to be controlled wherein each pore has a maximum opening dimension less than 3.25 mm.

21. In combination with a building structure erected on a ground level or near ground level concrete slab, a termite barrier comprising:

an adjacent structure, built adjacent to but non-integrally with the building structure, the adjacent structure built of a termite resistant material; and

a strip of termite barrier material formed of a flexible sheet made of a mesh material substantially resistant to termite secretions and having a hardness of not less than about Shore D70 for resistance to termite chewing, the strip having pores wherein each pore has a maximum opening dimension of less than 3.25 mm, said strip of termite barrier material having respective marginal edge portions along opposite longitudinal edges of the strip integrally secured to the slab and the adjacent structure to establish integrity of the connection between the slab and the adjacent structure against the passage of termites.

22. The combination of claim 21, wherein the mesh material is selected from the group consisting essentially of:

material formed of wire filaments;

sheet material having holes stamped or punched therein; and

film having holes stamped or punched therein.

23. A termite barrier flange for preventing passage of termites between a cast concrete slab and a member projecting through the slab, said termite barrier flange comprising a body formed from a mesh material, the mesh material having pores, wherein each pore has a maximum opening dimension of less than 3.25 mm, the body having an inner peripheral portion defining an opening adapted to receive the member and an outer peripheral portion adapted to be integrally secured to the slab.

24. The termite barrier flange as claimed in claim 23 wherein the outer peripheral protein is adapted to be embedded in the slab during pouring of the slab for integrally securing the outer peripheral portion to the slab.

25. The termite barrier flange as claimed in claim 23 wherein the inner peripheral portion comprises a cylindrical sleeve adapted to be clamped in pressure engagement with the member about a perimeter of the member.

26. The termite barrier flange as claimed in claim 25 further comprising a clamp for clamping the cylindrical sleeve in pressure engagement with the member.

27. The termite barrier flange as claimed in claim 23 wherein the outer peripheral portion extends radially outward from the inner peripheral portion.

28. The termite barrier flange as claimed in claim 23 wherein the material is substantially resistant to termite secretions and has a hardness of not less than about Shore D70 for resistance to termite chewing.

29. A method of termite barrier installation for a building structure, comprising the act of:

during erection of the building structure on a slab of concrete at or near ground level, positioning a mesh sheet coextensively with at least a portion of the slab, the mesh sheet being formed of a material substantially resistant to termite secretions, the material having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh sheet having open pores permitting fluid flow therethrough, the open pores having a maximum opening dimension of less than 3.25 mm to thereby exclude entry of termites into the building structure through said portion of the slab.

30. The method of termite barrier installation as claimed in claim 29 comprising casting the slab in-situ, and wherein the positioning of the mesh sheet comprises positioning the mesh sheet beneath the slab prior to pouring of concrete over the mesh sheet to cast the slab.

31. The method of termite barrier installation as claimed in claim 29 wherein the positioning of the mesh sheet comprises embedding the mesh sheet in the slab.

32. A method of termite barrier installation for a building structure, comprising the act of:

during erection of the building structure on a slab of concrete at or near ground level, positioning a sheet coextensively with at least a portion of the slab, the sheet being formed of a mesh material substantially resistant to termite secretions, the material having a hardness of not less than about Shore D70 for resistance to termite chewing, the sheet having open pores permitting fluid flow therethrough, to thereby exclude entry of termites into the building structure through said portion of the slab, the open pores having a maximum opening dimension less than 3.25 mm, wherein the positioning of the sheet comprises positioning the sheet beneath the slab.

33. The method of termite barrier installation as claimed in claim 32 wherein the slab has a perimeter, wherein the positioning of the sheet comprises positioning the sheet beneath the slab to extend to the perimeter of the slab in all directions and upwardly about said perimeter to terminate with an outer edge portion of the sheet at a distance above adjacent ground level.

34. The method of termite barrier installation as claimed in claim 33 wherein the outer edge portion of the sheet terminates above the slab.

35. The method of termite barrier installation as claimed in claim 32 comprising casting the slab in-situ, wherein the positioning of the sheet comprises positioning the sheet prior to pouring of concrete over the sheet to cast the slab, wherein the sheet completely covers a ground surface area where the slab is to be poured, and further comprising the act of:

contouring the sheet to closely follow contours of the ground surface area where the slab is cast.

36. A method of termite barrier installation for a building structure, comprising the act of:

during erection of the building structure on a slab of concrete at or near ground level, positioning a sheet coextensively with at least a portion of the slab, the sheet being formed of a mesh material substantially resistant to termite secretions, the material having a hardness of not less than about Shore D70 for resistance to termite chewing, the sheet having open pores permitting fluid flow therethrough, to thereby exclude entry of termites into the building structure through said portion of the slab, the open pores having a maximum opening dimension of less than 3.25 mm, wherein the positioning of the sheet comprises positioning the sheet above the slab.

37. A method of termite barrier installation for a building structure, comprising the act of:

during erection of the building structure on a slab of concrete at or near ground level, positioning a sheet coextensively with at least a portion of the slab, the sheet being formed of a mesh material substantially resistant to termite secretions, the material having a hardness of not less than about Shore D70 for resistance to termite chewing, the sheet having open pores permitting fluid flow therethrough, to thereby exclude entry of termites into the building structure through said portion of the slab, the open pores having a maximum opening dimension of less than 3.25 mm, wherein the building structure includes a termite resistant structure adjacent to and non-integral with the slab, and further comprising the act of:

integrally securing an outer edge portion of the sheet to the termite resistant structure.

38. The method of termite barrier installation as claimed in claim 37, wherein the integrally securing act comprises:

adhesively bonding the outer edge portion of the sheet to the termite resistant structure.

39. The method of termite barrier installation as claimed in claim 38, wherein the bonding comprises bonding with a bonding material which is resistant to termites.

40. The method of termite barrier installation as claimed in claim 37, wherein the integrally securing act comprises:

mechanically fixing the outer edge portion of the sheet to the termite resistant structure.

41. The method of termite barrier installation as claimed in claim 37, wherein the termite resistant structure is of concrete, and wherein the integrally securing act comprises:

casting the termite resistant structure in-situ such that the outer edge portion of the sheet is embedded into the termite resistant structure.

42. The method of termite barrier installation as claimed in claim 37, wherein the termite resistant structure is a wall of brick, and wherein the integrally securing act comprises:

constructing the wall of brick with the outer edge portion of the sheet embedded in the wall between two layers of bricks.

43. A method of termite barrier installation for a building structure, comprising the acts of:

during erection of the building structure on a slab of concrete at or near ground level, positioning a sheet coextensively with at least a portion of the slab, the sheet being formed of a mesh material substantially resistant to termite secretions, the material having a hardness of not less than about Shore D70 for resistance to termite chewing, the sheet having open pores permitting fluid flow therethrough, the open pores having a maximum opening dimension of less than 3.25 mm,

forming at least a portion of the sheet into a termite barrier flange; and

clamping the termite barrier flange in pressure engagement about a perimeter of a member projecting through the slab, to thereby exclude entry of termites into the building structure through said portion of the slab.

44. The method of termite barrier installation as claimed in claim 43 wherein the forming at least a portion of the sheet into a termite barrier flange comprises cutting an opening in the sheet, said opening having a perimeter smaller than the perimeter of the member, and stretching and deflecting a marginal area of the sheet about the opening to form the termite barrier flange about the member.

45. A method of termite barrier installation in a building structure erected on a concrete slab at or near ground level and having an adjacent structure which is non-integral to the concrete slab and is termite resistant, the method comprising the acts of:

integrally securing a first marginal edge portion of a strip to a portion of the slab, the strip being formed of a mesh material substantially resistant to termite secretions, the material having a hardness of not less than about Shore D70 for resistance to termite chewing, the strip having open pores having a maximum opening dimension less than 3.25 mm, the strip having a second marginal edge portion opposite the first marginal edge portion; and

integrally securing the second marginal edge portion of the strip to the adjacent structure, to thereby provide integrity between the slab and the adjacent structure against passage of termites and thereby exclude entry of termites into the building structure.

46. The method of termite barrier installation as claimed in claim 45 wherein the integrally securing the first marginal edge portion comprises bonding the strip to the slab by adhesive bonding.

47. The method of termite barrier installation as claimed in claim 46, wherein the bonding comprises bonding with a bonding material which is resistant to termites.

48. The method of termite barrier installation as claimed in claim 45 wherein the integrally securing the first marginal edge portion comprises mechanically fixing the strip to the slab.

49. The method of termite barrier installation as claimed in claim 45 wherein the integrally securing the first marginal edge portion comprises bonding the strip to the adjacent structure by adhesive bonding.

50. The method of termite barrier installation as claimed in claim 49, wherein the bonding comprises bonding with a bonding material which is resistant to termites.

51. The method of termite barrier installation as claimed in claim 45 wherein the integrally securing the second marginal edge portion comprises bonding the strip to the adjacent structure by mechanical fixing.

52. The method of termite barrier installation as claimed in claim 45 comprising casting the slab in-situ and wherein the integrally securing the first marginal edge portion comprises embedding the first marginal edge portion into the slab during casting.

53. The method of termite barrier installation as claimed in claim 45 comprising casting the adjacent structure in-situ and wherein the integrally securing the second marginal edge portion comprises embedding the second marginal edge portion into the adjacent structure during casting.

54. The method of termite barrier installation as claimed in claim 45 wherein the adjacent structure comprises a wall of brick construction and wherein the integrally securing the second marginal edge portion comprises embedding the second marginal edge portion in the wall between two layers of bricks.

55. A method of termite barrier installation for a building structure, comprising the acts of:

positioning a termite barrier flange around a member projecting through a slab of concrete at or near ground level, the termite barrier flange formed of a mesh material, the mesh material having pores, wherein each pore has a maximum opening dimension of less than 3.25 mm, the termite barrier flange comprising an inner peripheral portion defining an opening for the member and an outer peripheral portion extending from the inner peripheral portion;

establishing a seal against the passage of termites between the inner peripheral portion and the member; and

integrally securing the outer peripheral portion to the slab, such that the termite barrier flange protects against the passage of termites between the slab and the member projecting there through.

56. The method of termite barrier installation as claimed in claim 55 wherein the mesh material is substantially resistant to termite secretions, the mesh material having a hardness of not less than about Shore D70 for resistance to termite chewing.

57. The method of termite barrier installation as claimed in claim 55 comprising casting the slab in-situ and wherein the integrally securing comprises embedding the outer peripheral portion into the slab during casting.

58. The method of termite barrier installation as claimed in claim 55 wherein the establishing the seal comprises clamping the inner peripheral portion in pressure engagement with the member about a perimeter of the member.

59. A method of termite barrier installation for a building structure, comprising the act of:

during erection of the building structure on a foundation structure, covering at least a portion of the foundation structure with a termite barrier, the termite barrier being formed of a mesh material substantially resistant to termite secretions, the mesh material having a hardness of not less than about Shore D70 for resistance to termite chewing, the mesh material having pores wherein each pore has a linear dimension in all directions less than 3.25 mm, to thereby exclude entry of termites into the building structure through said foundation structure.