GB2407608A

GB2407608A - Barrier for sub-floor ventilator of a building

Info

Publication number: GB2407608A
Application number: GB0324999A
Authority: GB
Inventors: Neil Barker; Henry David Langer
Original assignee: WT
Current assignee: WT
Priority date: 2003-10-27
Filing date: 2003-10-27
Publication date: 2005-05-04
Also published as: US20070130849A1; EP1692362A1; GB0324999D0; WO2005042902A1

Abstract

A barrier against entry of water into a building through a ventilator comprises sealant material adhered to an external surface of the ventilator. The sealant material may comprise a self adherent pad. The sub-floor ventilator may be an airbrick. The sealant material may be flexible. The sealant material may comprise a laminate, one layer of which may be a release liner 1 separable from the other layers or layers. The laminate may comprise a backing substrate 3 and an adhesive substrate 2. The invention provides a method of protecting a building using such a barrier and a building protected by such a barrier.

Description

::1: .. 2407608 :.e.. . BARRIER FORMATION AND BUILDING PROTECTED =AR'R1ER

The present invention is concerned with the formation of barriers against water entry and embraces buildings which have been protected by application of a barrier means thereto, which will prevent entry of water, such as flood water, into sub-floor area ventilators which are most commonly in the form of inbuilt air bricks. There is a need for a temporary flood protection means to be placed over sub-floor ventilators, such as air bricks, so as to prevent flood walers penetrathg through the ventilator and into the building sub-floor area. If flood water penetrates through sub-floor area ventilators such as air bricks, there is likely to be I () damage to the building structure or foundations coupled with the dit't'icully of removing such flood water once it has penetrated into the sub-floor area and potential risks of damp or similar detects entering the infernal parts of the building structure. Accordingly there is a need l'or a suitable barrier material, such as a waler-proof or substantially water-resistant pad which can be applied to the ventilators, such as air bricks in a threatened flood condition and before flood water rises to a level where any of the material will be in contact with such water. In such threatened flood conditions it will be desirable for the material, which its most conveniently provided h1 the form of a pad, to be applied before flood water has reached the sub-floor ventilator level since the material may not bond or become bonded effectively to the brick work or mortar surrounding the ventilator with the consequence that a waler proof or 2() waler impenetrable seal may not be created.

According Lo one aspect of this invention there is provided a method of forming a barrier against entry of water into a sub-floor ventilator of a building, which comprises adhesion of a sealant material to an external surt;ace of said sub-floor ventilator. The ventilator preferably comprises at least one air brick within a wall of the building. The sealant material is most prel'erably a sell:adhesive pad. This may be adhered to the external suri:ace of the ventilator mcludmg the periphery ol'the ventilator. Preferably such self-adhesive pad can be adhered to the external surface of the ventilator and to building material immediately surrounding the periphery of the ventilator such as the adjacent brick work and/or mortar normally 3() Immediately adjacent the periphery of the ventilator.

The preferred self-adhesive pads used in the present invention are preferably removeable after use. Such pads may incorporate at least one self adhesive layer or medium. It is preferred for the sealant material (e.g. such self-adherent pads) to be flexible or at least semi-flexible. The 2 ' ' I . :... .:e.

sealant material is conveniently formed, supplied and used as a pad which Is convcnently rectangular and of a size generally to conform with or be slightly larger than the external dimensions oi'an air brick ventilator. Alternative embodiments of sealant material are contemplated. For example, such material could be provided in roll form, from which a user could cut suitable portions for application. Conveniently self-adhesive pads are resiliently pliable. The sealant material can be a composite of two or more layers, such as a laminate. It is preferred that one of the layers in a composite self-adherent pad is a removable release mcclirm separable from the remaking layer or layers but without affecting the adhesiveness.

Of the pad. The laminate may comprise a backing substrate, an adhesive substrate and optionally a removeable release liner medium. Such a backing substrate may conveniently comprise water proof plastics film and/or metal toil and/or water proof fabric material.

Alternatively, a backing substrate could comprise an adhesive layer, or the backing substrate could be omitted in some embodiments. The adhesive substrate in some embodiments may essentially consist of an adhesive layer.

In such waterproof plastics film, film may be selected from one or more of the following materials, namely; polyester, polyethylene, polypropylene, and polyvinylchloridc.

The metal foil, where used as a component part of the backing substrate can conveniently comprise aluminium foil optionally laminated to PVC, polyethylene, polyester or polypropylene l'ihn. 'I'hc waterproof fabric material where used as a component of the backing, substrate is conveniently selected, for example, from polyester spunbonded (non- woven) fabric and polypropylene spunbonded (non-woven) fabric although other materials of a similar nature could be deployed.

In relation to the al'oresaid laminate the adhesive is preferably a rubber based adhesive, more preferably comprising butyl or polyisobutylene rubber, or alternatively comprising EPR (ethylene propylene rubber), SBK (styrene-butadiene rubber), natural rubber or thermoplastic rubbers such as SIS (styrene isoprenc styrene), SBS (styrene butadiene styrene) or SEES S() (styrene ethyl butylenes styrene). Other adhesive components useful in the sealant material in the form of sclt:adherent pads may typically include one or more of the following components, namely; bitumen, organic filler, mineral filler, polybutene plasticiser, mineral oil plasticiser, tackifying hydrocarbon resins; rosin esters, processing aids, anti-oxidant and pgmcnt. The laminate most conveniently comprises a release lmer preferably present as an 32.. .. , .. ',' external layer prior to application of the material to a sub-floor ventilator. Such a liner may conveniently be comprised of at least one of the following materials, namely; siliconised plastic film such as siliconised low density polyethylene, polypropylene, polyester, high density polyethylene or silconised paper.

If release liner is not present as part of the sealant material, then the sealant material could be supplied as a.self:wouncl roll, where the backing substrate is itself siliconised on one side.

In accordance with a second aspect, the invention also provides a method of forming a barrier 1() in which the sealant material is in the form of a composite laminate comprising a release liner and which method includes the following steps: a) providing a composite laminate including an adherent material and a release liner such that the laminate is in the form of a flexible or at least partly flexible pad, b) removing the release liner from the composite to expose an adherent surface of the material, c) positioning the adhesive layer of the pad such that its exposed adherent surface is brought into contact with the exposed external surface of a sub-floor ventilator, d) applying the adherent surface to the said exposed surface of the ventilator and 2() optionally into contact with the periphery of the ventilator and optionally into contact with building material surrounding the periphery of the said ventilator, e) applying pressure to that surface of the pad remote from the said adherent surface to cause the pad to cover in a water-sealing manner the said external surface of the ventilator, and optionally: f) removing the adhered pad lrom the ventilator after a flood condition or threatened flood condition, and optionally: g) removing from the ventilator and/or the periphery of the ventilator and/or building material surrounding the periphery of the ventilator at least some excess adhesive material not removed hi step f) above, ( ) In a third aspect the invention also provides a building having a wall structure provided with at least one sub-floor ventilator, wherein a sealant material is adhered to an external surface of said ventilator, forming a barrier against entry of water into said ventilator. Similarly, such sealant material can be in the form ol a self-adherent pact. e 4e;

c Such ventilator may typically comprise of one air brick. The selfadherent pad is preferably adhered to the external surface includhlg the periphery of the ventilator. The pad can even more conveniently be adhered lo the external surface of the ventilator and to building material immediately surrounding the periphery of the ventilator, such as the brickwork and/or mortar material immediately adjacent the periphery of the ventilator. It is preferred that within the scope of the third aspect of the present invention as defined above, the selt:adherent pad is made or otherwise formed as defined above in connection with the first aspect of the present invention.

In application of embodiments of the invention it is most convenient and therefore preferred that the vcntilalor, such as the air brick, and the surrounding brickwork and/or mortar material to which the selLadherent pad is to bond, is cleaned prior to its application. In the absence of such cleaning procedures there is a risk that such self-adherent pads will not bond adequately or et'l'eclively to the ventilator and hence may not provide the protection against entry of water into the suh-Roor area of a building as is intended.

On the external surface of the ventilator, and upon the brickwork and/or mortar materials immediately surrounding the periphery of the exposed surface of the ventilator, any algae, dirt () and dust should be removed, ideally by brushing with a.stit'f brush. Any puddles of water remaining on the air brick or brickwork should be wiped off before application of self: adherent pad e.g. with an appropriate dry cloth. In application of embodiments of the invention wherein the sealant is in the form of a pad or a cut portion from a wound roll, the pad or portion should be applied at a temperature greater than 0 c and more preferably greater than 4 c. The pads, if stored in cold conditions, may be easier to apply if stored for e.g. thirty minutes in an ambient or warm room e.g. at a temperature in the region of 15-25 c and preferably 18-25 c. Prior to application of a pad incorporating a release liner, the release liner should be removed from the pad to expose an adhesive surface of the adhesive layer which is preferably pigmented or coloured so as to match the surrounding brickwork e.g. red or brown or ready-brown in colour. Steps should be taken to prevent dirt or other contamination from becoming attached to the exposed adhesive surface. As soon as the surface of the adhesive component has been exposed for use, the selt:adherent pad should be applied gently to the ventilator, and preferably so that the air brick will be located centrally with respect to the applied pad.

: : : se e: : : :. es ce.

In the cvenl that an implement such as a small decorating roller is available, working from the centre of the pad, it is preferred to roll very firmly outward to the edges, covering the whole pad area to ensure that the pad has bonded evenly across its whole area. In the absence of such a roller implement, then it is possible to use an item such as the back of a tablespoon.

Again working born the contre, the pad should be smoothed outwards lo the edges using good hand pressure upon the bowl of the spoon and ensuring that the whole pad is smoothed to obtain adequate and good adhesion to the air brick. For those embodiments of the invention in the nature of a self-adherent pad, it is desirable to ensure that the adhesive component is pressed well into the mortar courses and/or any surrounding brick work around the periphery ol the air brick.

Once floodwater has been dispersed or the threat of a flood condition is rescinded, the sell: adherent pads should be removed from the ventilators to allow air once again to circulate as normal through the air brick.

In order to remove such a pad, it should normally only be necessary to lift one edge and pull the adhesive surface component of the pad away from the air brick. Some of the adhesive component Nay remain on the brick work and/or mortar immediately surrounding the 2() periphery of the air brick, upon removal of the pad. Dabbing the adhesive surface of the pad onto all such items of adhesive residue is likely to assist and may effectively remove most ol the remaining adhesive. As indicated above, in preferred embodiments of the invention, the adhesive component is itself coloured so as to march the shade of the air brick and/or surroundhg brickwork so that if any small adhesive residue remains after removal, such remnants are likely to blend in with the brickwork and so not impair appearance of the building after complete removal of the pad.

In order that the invention may be illustrated, more easily appreciated and readily carried into effect by those skilled hi the art, non-limiting embodiments will now be described purely by 3() way ol example only, with reference lo the accompanying drawing in which FIGURE I is a schematic view of a suitable self-adherent laminated pad for use in the present methods and for use in the building aspect of the present invention. t

6 'I ' ' . c Referring to FIGURE 1 the laminated sealant material composes an optional layer (1) of siliconised high density polyethylene release liner which may have a thickness of the order 40 to 10() microns, preferably 50 to 80 microns.

Adjacent the release liner (1) there is provided an adhesive component which is preferably butyl-rubber or polyisobutylene-rubber based. In this embodiment the adhesive component is coloured a ready brown to blend in with bricks of the building after removal should some adhesive debris be left behind. The thickness ol'this adhesive component is not especially crucial. although In preferred embodiments the thickness is conveniently of the order 1-2 mm. 1()

The third component of the laminated sealant material is a backing substrate which as shown in Figure I comprises a composite layer (3) which consists of aluminium foil laminated to polyester l'iLn The thickness of the aluminium foil is not especially crucial although for convemence this may have a thickness in the range of 10-30 microns or preferably 15-25 microns. Similarly the thickness of the polyester film part of the composite does not appear especially crucial although for convenience it is preferred to use a polyester film having a thckncss of 1()-4() microns, preferably 15-35 microns, more preferably 20-3() microns.

With ret'erence to the backing substrate of suitable selt:adhereat laminated pads, preferred embodiments of the invention are based on the use of a composite material which may consist of alumhium foil and polyester film laminated together.

In relation to the adhesive layer of suitable laminated selt:adherent pads, it is preferred to use a butyl-rubber or polyisobutylene r ubber based adhesive, filled with organic and mineral fillers and with polybutene and mineral plasticisers. Some processing aids, anti-oxidants and pigments arc also preferably included within the formulation of the adhesive layer. Release liners, where present, serve to protect an exposeable adhesive surface prior to application of the pad to a subfloor ventilator. As indicated in connection with Figure 1 herein, it is presented for such release liner to comprise siliconised low density or high density 3() polyethylene.

It will he apparent that the self-adherent pad embodiments are to be used as a sealant mainly for air bricks to protect them from water seeping through into the sub-floor area of a building, as a result of flooding. Application of the self-adherenl pad is also useful in the event of a 7. '', 2 .

. 4, . threatened or forewarned flood condition whether or not a flood subsequently takes place. To be most effective, the self-adherent pad should be applied to the air brick before the air brick has beco He in contact with water. The pad can be fabricated as a generally rectangular pad and of a size to cover standard size air bricks although a plurality of different sizes are possible. In order to apply the preferred product to a building structure, based on a three layered laminate, the consumer simply removes the backing release liner and applies the exposed aclhcsivc surl'ace across the air brick by applying pressure and working in the edges into the material surrounding the air brick using preferably an implement such as a small decorating roller or the hack of a spoon. After a flood, or withdrawal of any threatened flood condition, the pad can be peeled away from all air bricks of the building upon which it has been applied and then disposed of. Any adhesive residue can be scrubbed off using a wire brush or alternatively by repeated application such as 'dabbing' of the removed pad.

Embodiments of pads have been tested and were effective as a water sealant so as to prevent entry of water through an air brick into the sub- floor area of a building before the air brick has become submerged under water.

Rcl'erencc will now be made to the following specific examples and test results:

Example I

2() A sell:adherent pad of sealant material was provided in the form of product reference Scapa ()314 \\hch is a polyisobuylene-rubber based adhesive substrate laminated with an aluminium/polypropylene laminated film and including a siliconised release medium in the form of paper or film. The product Scapa 0314 is commercially available in the United Kingdom from Scapa UK Limited. The pad was applied to an in-built air brick ventilator which was subsetluently exposed to water.

Example 2

A self-adherent pad of sealant material was provided in the form of product reference Scapa ()318 which is a polyisobutylenc-rubber based adhesive substrate laminated with a spun 3(') bonded polyester l'abric and incorporating as part of the laminate prior to application, a siliconsed release medium in the form of paper or film. The pad was applied to an in-built air brick ventilator which was subsequently exposed to water.

:e::. .e:e Test Result I Specific sealant materials of examples I and 2, having been applied into n of pads to the external surfaces of air bricks inbuilt as part of an existing building were demonstrated to be effective no preventing passage of water through the air brick, and capable of subsequent removal without impeding airflow after use. In particular pads of these materials were constructed and applied as indicated above to airbricks with up to two courses of bricks of a huildng above covered with water at a height of the order six inches above the upper most edge ol the airbrick. It was found that no detectable water had penetrated through the sealed airbrcks, and the pads could be removed after use without blocking or impeding airflow through the airbrick after removal...CLME: ::::e ce.e a... :e .e

Claims

1. A method of forming a barrier against entry of water into a sub-floor ventilator of a building, which comprises adhesion of a self-adherent sealant material, such as a.self-adherent pad, to an external surface of said sub-floor ventilator.

2. A method as claimed in claim 1, wherein the ventilator comprises at least one airbrick within a wall of.said building. 1()

3. A method as claimed in either preceding claim, in which the sealant material is adhered to said external surface including the periphery of the ventilator.

4. A method as claimed in any preceding claim, in which the sealant material is adhered to said external surface of the ventilator and to building material immeciiately surrounding the periphery of the ventilator.

5. A method as claimed in claim 4, in which the building material comprises brickwork and/or mortar immediately adjacent the periphery of the ventilator.

(I. A method as claimed in any preceding claim, in which the sealant material incorporates a removeable layer.

7. A method as claimed in any preceding claim, in which the sealant material is flexible or.semi-flexible X. A method as claimed in any preceding claim, in which the sealant material is formed as a sell:adherent pad, or a portion from a roll of material.

3() 9. A method as claimed in any preceding claim, in which the pad its resiliently pliable.

1(). A method as claimed in any preceding claim, in which the sealant material comprises a composite material.

1 11. A method as claimed in claim 10, in which the composite material comprises a laminate of two or more layers.

12. A method as claimed in claim 11, in which one of the layers comprises a release liner and is separable from the other layer or layers.

13. A metlod as claimed in claim 11 or 12, in which the laminate comprises a backing substrate and an adhesive substrate and optionally a release Imer.

1() 14. A method as claimed in claim 13, in which the backing substrate comprises waterproof plastics film and/or metal foil and/or waterproof t'abric material.

15. A method as claimed in claim 14, in which the waterproof plastics film is selected from film of one or more of the following materials, namely polyester, polyethylene, ] 5 polypropylene and polyvinylchloride.

16. A method as claimed in claim 13 or 14, wherein the metal foil comprises aluminium toil optionally laminated to polyethylene or polypropylene film.

17. A method as claimed in any one of claims 13 to 16, in which the waterproof fabric material Is selected from polyester spunbonded (nonwoven) fabric and polypropylene spunbonded (non-woven) fabric.

IX. A method as claimed in any one of claims 14 to 17, in which the adhesive is a rubber based adhesive, comlJrisng butyl-rubber or polyisobutylene rubber or alternatively comprising EPR, SBR, natural rubber or thermoplastic rubbers such as SIS, SBS or SEBS.

19. A method as claimed in any one of claims 13 to 18, in which the adhesive layer comprises rbbcr together with one or more of the following components, namely: bitumen, organic filler, tackifying resin, rosin esters, mineral filler. polybutene plasticizer, mineral oil plasticiser, processing aids, anti-oxidant and pigment.

2(). A method as claimed in any one of claims 13 to 19, in which a release liner is mcludetl in the laminate prior to application thereof to the sub-floor ventilator, and which liner is lit ce rate ë :. c. ee.

comprised of at least one of the following materials, namely: siliconised plastic film such as shcomsed low density polyethylene, polypropylene, polyester, high density polyethylene or siliconised paper.

21. A method of forming a barrier as claimed in any preceding claim, in which the sealant material includes a removeable liner, optionally as defined in claim 20, and which method includes the following steps: a) providing a self-adherent pad and release liner composite which is flexible or at least partly flexible, b) removing the release liner- from the composite so as to expose an adherent surface of the pad, c) positioning the pad such that its exposed adherent surface is brought into contact with the exposed external surface of a sub-floor ventilator, l 5 d) applying the adherent surface of the pad to the said exposed surface of the ventilator and optionally Into contact with the periphery of the ventilator and optionally info contact with building material surrounding the periphery of the said ventilator, e) applying a pressure to that surface of the pad remote from the said adherent 2() surface to cause the pad to cover in a water-sealing manner the said external surface of the ventilator, and optionally f) removing the adhered pad from the ventilator after a flood condition or threatened flood condition, and optionally g) removing Tom the ventilator and/or the periphery of the ventilator and/or building material surrounding the periphery of the ventilator at least some excess adhesive material not removed in step f) above.

22. A method of forming a barrier as claimed in any one of claims 1 to 21 substantially as herein lescrbed. ()

23. A method of forming a barrier as claimed in any one of claims I to 21 substantially as herein exemplified.

.1. ',,, ', ', '. 2 24. Use of a laminated self-adherent pad as illustrated herein in a method as claimed in any one ofclaims I to21.

25. A building having a wall structure provided with at least one subfloor ventilator, wherein a sealant material such as a self-adherent pad is adhered to an external surface of said ventilator, forming a barrier against entry of water into said ventilator.

26. A building as claimed in claim 25, wherein the ventilator comprises at least one airbrick. 1()

27. A 'building as claimed h1 claim 25 or 26, wherein the sealant material is adhered to said external surface including the periphery of the ventilator.

2X. A building as claimed in any one of claims 25 to 27, wherein the sealant material is adhered to said external surface of the ventilator and to building material immediately surrounding the periphery of the ventilator.

29. A building as claimed in claim 2X, wherein the building material comprises brickwork and/or mortar immediately adjacent the periphery of the ventilator.

3(). A building as claimed in any one of claims 25 to 29, wherein the sealant material is as defined in any one of claims 6 to 20.

31. A building as claimed in any one of claims 25 to 30 substantially as herein described.

32. A building as claimed in any one of claims 25 to 30 substantially as herein exemplified.

3() 33. Use of a laminated sealant material as illustrated herein in a building as claimed in any one of claims 25 to 32.