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NL2007920A - A building having a cavity wall structure, an element for extracting moisture from a cavity wall structure, and a method for installing means for abstracting moisture from a cavity wall structure. - Google Patents

A building having a cavity wall structure, an element for extracting moisture from a cavity wall structure, and a method for installing means for abstracting moisture from a cavity wall structure. Download PDF

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Publication number
NL2007920A
NL2007920A NL2007920A NL2007920A NL2007920A NL 2007920 A NL2007920 A NL 2007920A NL 2007920 A NL2007920 A NL 2007920A NL 2007920 A NL2007920 A NL 2007920A NL 2007920 A NL2007920 A NL 2007920A
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Netherlands
Prior art keywords
wall
cavity
building
hole
tubular
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NL2007920A
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Dutch (nl)
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NL2007920C2 (en
Inventor
Evert Frederik De Graaf
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Graaf Evert Frederik
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Publication date
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Priority to NL2007920A priority Critical patent/NL2007920C2/en
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Publication of NL2007920C2 publication Critical patent/NL2007920C2/en

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/70—Drying or keeping dry, e.g. by air vents
    • E04B1/7069—Drying or keeping dry, e.g. by air vents by ventilating
    • E04B1/7084—Drying or keeping dry, e.g. by air vents by ventilating with Knappen systems, i.e. atmospheric siphons

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)

Description

A building having a cavity wall structure, an element for extracting moisture from a cavity wall structure, and a method for installing means for abstracting moisture from a cavity wall structure
The invention relates to a building having a cavity wall structure comprising an inner skin, an outer skin and a cavity there between, further comprising means for abstracting moisture from said wall structure, said means comprising a hole in said outer skin, and a duct shaped porous moisture-permeable element fixed in said wall structure extending between said inner skin and said hole in the outer skin, such that an enclosed space is formed by said element in said cavity which is in air communication with the air outside said outer skin, while the cavity between the inner skin and the outer skin is substantially sealed by said element from the air outside said outer skin. A building with such means for abstracting moisture from its cavity wall structure is described in EP-A-0829587, which is incorporated herein by reference.
Cavity walls consist of two skins, being the outer skin and the inner skin, separated by a hollow space or cavity. The skins are commonly masonry, such as brick or concrete block. Different masonry materials can be used on either side of the cavity. The cavity can be empty but can also be partially or completely filled with thermal insulation by various methods. Cavity sizes typically are at least 50 mm to 100 mm. Masonry is an absorbent material, and therefore will slowly draw humidity into the wall. The means for abstracting moisture from cavity walls as described in the prior art cause the moisture present in the cavity to condensate on the outer surface of the duct shaped element, and to escape through the porous moisture-permeable wall of the element into the environment. A problem related to this solution is that depending on the climate and location of the building and the duct shaped elements, moisture also condensates inside the building against the inner skin at the location of the element.
The goal of the invention is to provide better abstraction of moisture from cavity walls, and/or abstraction of moisture with less negative side effects, and/or easier and/or better mounting of the means.
According to a first aspect of the invention said duct shaped element is provided with a corrugated outer surface. Because of the larger surface area a better abstraction of moisture is obtained. The corrugations also make it easier to mount the element in the hole in the outer skin, because it has less friction than a smooth surface and will allow the ridges of some corrugations to break if too much force is exerted, whereby it may be prevented that the element is locked in the hole. It can also be fitted easier in holes which are not exactly the same size as the element as some of the corregations can break when some force is exerted allowing to fit. Furthermore, the corrugations will provide a better adhesive surface, for instance for cement.
Preferably said duct shaped element is also provided with a corrugated inner surface. Said corrugations preferably have a height of at least 2 mm, preferably at least 2.5 mm, more preferably approximately 3 mm. The wall of said duct shaped element preferably has a thickness between 6 and 18 mm, preferably between 10 and 14 mm, more preferably approximately 12 mm. Said duct shaped element is preferably made of a porous ceramic material, such as pottery or brick material. The volume enclosed by said duct shaped element is preferably at least 300 cm3, more preferably at least 450 cm3, still more preferably approximately 600 cm3. Said corrugations preferably extend in the axial direction of said duct shaped element.
According to a second aspect of the invention at least closest to at least one corner of said building, preferably at least the corner closest to the generally climatologic coldest side, said means comprise a pad of heat insulating material which is mounted inside the duct shaped element against the surface of the inner skin. Thereby condensation of moisture inside the building against the inner skin is prevented. The heat insulating capacity of the pad is preferably approximately the same as the heat insulating capacity of the outer skin plus the cavity. The circumference of said pad is preferably substantially identical to the inner circumference of the inner side of the cross-section of the duct shaped element.
Said duct shaped element preferably has a substantially rectangular cross-section. Said duct shaped element preferably has height which is substantially the same as the height of bricks surrounding the element of which said outer skin is built up, for instance a height of approximately 80 mm. Said duct shaped element preferably has width which is equal to or more than half the width of bricks surrounding the element of which said outer skin is built up, for instance a width of approximately 130 mm. Said duct shaped element preferably has a depth which is such that the element extends from the inner skin into the hole in the outer skin, for instance a depth of approximately 100 mm.
Said duct shaped element is preferably mounted in said hole in the outer skin, for instance by providing cement between the outer surface of the element and the surrounding outer skin. Said means further preferably comprise an air guiding element mounted in said hole in the outer skin, said air guiding element being structured such that air moving along the outer side of said outer skin is guided in and out of the enclosed space. An example of such an air guiding element is described in EP-A-0829587, which is incorporated herein by reference.
The invention also relates to a duct shaped porous moisture-permeable element, wherein said duct shaped element is provided with a corrugated outer surface.
The invention also relates to a method for installing means for abstracting moisture from a cavity wall structure comprising an inner skin, an outer skin and a cavity there between, said method comprising providing a hole in said outer skin, and mounting a duct shaped porous moisture-permeable element in said wall structure extending between said inner skin and said hole in the outer skin, such that an enclosed space is formed by said element in said cavity which is in air communication with the air outside said outer skin, while the cavity between the inner skin and the outer skin is substantially sealed by said element from the air outside said outer skin, wherein said duct shaped element is provided with a corrugated outer surface.
The invention also relates to a method for installing means for abstracting moisture from a cavity wall structure comprising an inner skin, an outer skin and a cavity there between, said method comprising providing a hole in said outer skin, and mounting a duct shaped porous moisture-permeable element in said wall structure extending between said inner skin and said hole in the outer skin, such that an enclosed space is formed by said element in said cavity which is in air communication with the air outside said outer skin, while the cavity between the inner skin and the outer skin is substantially sealed by said element from the air outside said outer skin, wherein at least closest to at least one corner of said building, typically on the coldest side of the building, a pad of heat insulating material is mounted inside the duct shaped element against the surface of the inner skin.
The invention will be illustrated by means of a description of a preferred embodiment with reference to the figures, wherein :
Figures 1 and 2 are partial cross sectional perspective views of a wall structure according to the invention; and
Figrues 3A and 3B are perspective views of a duct shaped porous moisture-permeable element and a pad of heat insulating material according to the invention.
According to the figures 1 and 2 a cavity wall structure of a building comprises an inner skin 1, an outer skin 2 and cavity 3 there between. The outer skin 2 is for instance made of masonry comprising cement 4 and bricks 5. The inner skin is for instance made of concrete slabs 6 or also of masonry. Insulation material 7 may be provided in the cavity 3.
The means for abstracting moisture from the cavity wall structure comprise a duct shaped porous moisture-permeable element 8, an air guiding element 9 and a pad 10 of heat insulating material.
The duct shaped moisture-permeable element 8 is for instance made from moist-permeable pottery or brick. It has a rectangular cross section, seen from the front of the wall, and consists of a single circumferential wall. The outer surface of the element 8 is corrugated, with the ridges 81 of the corrugations extending in axial direction. The corrugated surfaces enlarge the surface of the element up to double the surface area, whereby the condensation/evaporation capacity of the element is enlarged up to double the capacity. Furthermore the corrugated outer surface forms a good adhesive surface for cement. Also, if the element is inserted in a hole in an existing wall, the corrugations cause less friction than a smooth surface and the ridges of the corrugations are allowed to break when they contact the wall of the hole in order to prevent that the element is locked in the hole before it is in the final position .
The air guiding element 9 is comprised of a rectangular frame 91, for instance made of brick or concrete, said frame defining an opening, a clock shaped body 92 (seen in horizontal cross section) extending inside the opening of the frame 91 such that two oblique air ducts 94 are defined at both sides of the clock shaped body, and a vertical separating wall 93 extending from the back of the body 92. The front of the wider side of the clock shaped body 92 extends at a distance from the front of the frame 91, such that air flowing along the front of the wall is diverted into one of the air ducts 94, as indicated by the arrows.
The cross sections of both elements 8, 9 are rectangular, seen from the front of the wall, and are of comparable size.
The heat insulating pad 10 may be made of any suitable heat insulating material and has a generally rectangular shape with dimensions that fit the outer cross section of the duct shaped element 8. The pad 10 is placed between the inner skin 1 and the duct shaped element 8 and may be glued against the backside of the duct shaped element 8 before said element 8 is inserted in the hole.
The means for extracting moisture from the cavity wall can be fixed either in a wall while said wall is being built or in an existing wall, by providing a hole in the outer skin 2 which is slightly larger than the cross sections of the elements 8, 9, seen from the front of the wall. First duct shaped element 8 is placed with one outer end against the surface of the inner skin 1 and the other outer end extending in the hole in the outer skin 2, and is fixed to the outer skin 2 by a layer of cement 11. If necessary, especially near one or more corners of the building, the pad 10 of heat insulating is fixed inside the element 8 against the surface of the inner skin 1. Then the air guiding element 9 is fixed in the hole in the outer skin 2 by a layer of cement 12, such that the front of the frame 91 is in the same plane as the front of the outer skin 2.
The air guiding element 9 guides air flowing outside the outer skin 2 through one of the air ducts 94 into the space enclosed by the element 8, towards the back and around the separating wall 93 and the other air duct 94 (or vice versa), as indicated by the arrows in figure 2. Thereby a cold spot is created in the wall of the element 8, and moist condensates on the moist-permeable element 8. The moist passes through the element 8 into the enclosed space and evaporates into the air flow through the air duct 94. The pad 10 prevents that a cold spot is created in the inner skin 1 of the wall, whereby moist would condensate inside the building on the inner side of said skin 1.
The invention is not limited to the embodiment described above and many modifications are possible for instance with regard to shape, materials and dimensions within the scope of the appended claims.

Claims (15)

1. Gebouw met een spouwmuurstructuur omvattende een binnenmuur, een buitenmuur en een holte daartussen, voorts omvattende middelen voor het onttrekken van vocht uit de muurstructuur, waarbij de middelen een gat omvatten in de buitenmuur, en een buisvormig poreus vochtdoorlatend element dat in de muur is bevestigd en zich tussen de binnenmuur en het gat in de buitenmuur uitstrekt, zodanig dat een omsloten ruimte in de holte is gevormd door het element die in luchtverbinding staat met de lucht buiten de buitenmuur, terwijl de holte tussen de binnenmuur en de buitenmuur in hoofdzaak van de lucht buiten de buitenmuur is afgesloten door het element, met het kenmerk, dat het buisvormige element is voorzien van een geribbeld buitenoppervlak.A building with a cavity wall structure comprising an inner wall, an outer wall and a cavity therebetween, further comprising means for extracting moisture from the wall structure, the means comprising a hole in the outer wall, and a tubular porous moisture-permeable element that is in the wall fixed and extending between the inner wall and the hole in the outer wall such that an enclosed space in the cavity is formed by the element in air communication with the air outside the outer wall, while the cavity between the inner wall and the outer wall is substantially of the air outside the outer wall is closed off by the element, characterized in that the tubular element is provided with a ribbed outer surface. 2. Gebouw volgens conclusie 1, waarbij de ribbels een hoogte van ten minste 2 mm, bij voorkeur ten minste 2.5 mm, meer bij voorkeur ten minste 3 mm hebben.The building of claim 1, wherein the ridges have a height of at least 2 mm, preferably at least 2.5 mm, more preferably at least 3 mm. 3. Gebouw volgens conclusie 1 of 2, waarbij de wand van het buisvormige element een dikte heeft tussen 6 en 18 mm, bij voorkeur tussen 10 en 14 mm, meer bij voorkeur ongeveer 12 mm.3. Building as claimed in claim 1 or 2, wherein the wall of the tubular element has a thickness between 6 and 18 mm, preferably between 10 and 14 mm, more preferably about 12 mm. 4. Gebouw volgens conclusie 1, 2 of 3, waarbij het buisvormige element is vervaardigd van een poreus keramisch materiaal, zoals aardewerk of baksteenmateriaal.The building of claim 1, 2 or 3, wherein the tubular element is made of a porous ceramic material, such as earthenware or brick material. 5. Gebouw volgens een van de voorgaande conclusies, waarbij de ribbels zich in de axiale richting van het buisvormige element uitstrekken.5. Building as claimed in any of the foregoing claims, wherein the ridges extend in the axial direction of the tubular element. 6. Gebouw volgens een van de voorgaande conclusies, waarbij ten minste het meest nabij ten minste een hoek van het gebouw, bij voorkeur de hoek die zich het meest nabij de gewoonlijk klimatologisch koudste zijde bevindt, de middelen een mat van warmte-isolerend materiaal omvatten die in het buisvormige element tegen het oppervlak van de binnenmuur is bevestigd.Building as claimed in any of the foregoing claims, wherein at least the closest at least one corner of the building, preferably the corner that is closest to the usually climatic coldest side, the means comprise a mat of heat-insulating material which is fixed in the tubular element against the surface of the inner wall. 7. Gebouw volgens een van de voorgaande conclusies, waarbij de warmte-isolerende capaciteit van de mat ongeveer gelijk is aan de warmte-isolerende capaciteit van de buitenmuur plus de holte.7. Building according to one of the preceding claims, wherein the heat-insulating capacity of the mat is approximately equal to the heat-insulating capacity of the outer wall plus the cavity. 8. Gebouw volgens een van de voorgaande conclusies, waarbij het buisvormige element een in hoofdzaak rechthoekige dwarsdoorsnede heeft.Building according to one of the preceding claims, in which the tubular element has a substantially rectangular cross-section. 9. Gebouw volgens een van de voorgaande conclusies, waarbij het buisvormige element een diepte heeft die zodanig is dat het element zicht vanaf de binnenmuur tot in het gat in de buitenmuur uitstrekt.The building of any one of the preceding claims, wherein the tubular member has a depth such that the member extends from the inner wall into the hole in the outer wall. 10. Gebouw volgens een van de voorgaande conclusies, waarbij het buisvormige element in het gat in de buitenmuur is bevestigd, bijvoorbeeld door cement te plaatsen tussen het buitenoppervlak van het element en de omliggende buitenmuur.10. Building as claimed in any of the foregoing claims, wherein the tubular element is fixed in the hole in the outer wall, for example by placing cement between the outer surface of the element and the surrounding outer wall. 11. Gebouw volgens een van de voorgaande conclusies, waarbij de middelen voorts een luchtgeleidend element omvatten dat is bevestigd in het gat in de buitenmuur, waarbij het luchtgeleidende element zodanig is gevormd dat lucht die langs de buitenzijde van de buitenmuur stroomt in en uit de omsloten ruimte wordt geleid.11. Building as claimed in any of the foregoing claims, wherein the means further comprise an air-conducting element mounted in the hole in the outer wall, the air-conducting element being shaped such that air flowing in and out of the outside wall of the outer wall space is led. 12. Buisvormig poreus vochtdoorlatend element, met het kenmerk, dat het buisvormige element is voorzien van een geribbeld buitenoppervlak.12. A tubular porous moisture-permeable element, characterized in that the tubular element is provided with a ribbed outer surface. 13. Werkwijze voor het installeren van middelen voor het onttrekken van vocht uit een spouwmuurstructuur omvattende een binnenmuur, een buitenmuur en een holte daartussen, waarbij de werkwijze omvat het aanbrengen van een gat in de buitenmuur, en het bevestigen van een buisvormig poreus vochtdoorlatend element dat zich uitstrekt tussen de binnenmuur en het gat in de buitenmuur, zodanig dat een omsloten ruimte in de holte wordt gevormd door het element die in luchtverbinding staat met de lucht buiten de buitenmuur, terwijl de holte tussen de binnenmuur en de buitenmuur in hoofdzaak door het element is afgesloten van de lucht buiten de buitenmuur, met het kenmerk, dat het buisvormige element is voorzien van een geribbeld buitenoppervlak.A method of installing means for extracting moisture from a cavity wall structure comprising an inner wall, an outer wall and a cavity therebetween, the method comprising providing a hole in the outer wall, and attaching a tubular porous moisture-permeable element that extending between the inner wall and the hole in the outer wall such that an enclosed space in the cavity is formed by the element in air communication with the air outside the outer wall, while the cavity between the inner wall and the outer wall is substantially through the element is sealed from the air outside the outer wall, characterized in that the tubular element is provided with a ribbed outer surface. 14. Gebouw met een spouwmuurstructuur omvattende een binnenmuur, een buitenmuur en een holte daartussen, voorts omvattende middelen voor het onttrekken van vocht uit de muurstructuur, waarbij de middelen een gat omvatten in de buitenmuur, en een buisvormig poreus vochtdoorlatend element dat in de muur is bevestigd en zich tussen de binnenmuur en het gat in de buitenmuur uitstrekt, zodanig dat een omsloten ruimte in de holte is gevormd door het element die in luchtverbinding staat met de lucht buiten de buitenmuur, terwijl de holte tussen de binnenmuur en de buitenmuur in hoofdzaak van de lucht buiten de buitenmuur is afgesloten door het element, met het kenmerk, dat ten minste het meest nabij ten minste een hoek van het gebouw, bij voorkeur de hoek die zich het meest nabij de gewoonlijk klimatologisch koudste zijde bevindt, de middelen een mat van warmte-isolerend materiaal omvatten die in het buisvormige element tegen het oppervlak van de binnenmuur is bevestigd.A building with a cavity wall structure comprising an inner wall, an outer wall and a cavity therebetween, further comprising means for extracting moisture from the wall structure, the means comprising a hole in the outer wall, and a tubular porous moisture-permeable element that is in the wall fixed and extending between the inner wall and the hole in the outer wall such that an enclosed space in the cavity is formed by the element in air communication with the air outside the outer wall, while the cavity between the inner wall and the outer wall is substantially of the air outside the outer wall is closed off by the element, characterized in that at least the closest to at least one corner of the building, preferably the corner that is closest to the usually climatic coldest side, the means comprises a mat of heat-insulating material which is mounted in the tubular member against the surface of the inner wall. 15. Werkwijze voor het installeren van middelen voor het onttrekken van vocht uit een spouwmuurstructuur omvattende een binnenmuur, een buitenmuur en een holte daartussen, waarbij de werkwijze omvat het aanbrengen van een gat in de buitenmuur, en het bevestigen van een buisvormig poreus vochtdoorlatend element dat zich uitstrekt tussen de binnenmuur en het gat in de buitenmuur, zodanig dat een omsloten ruimte in de holte wordt gevormd door het element die in luchtverbinding staat met de lucht buiten de buitenmuur, terwijl de holte tussen de binnenmuur en de buitenmuur in hoofdzaak door het element is afgesloten van de lucht buiten de buitenmuur, met het kenmerk, dat ten minste het meest nabij ten minste een hoek van het gebouw een mat van warmte-isolerend materiaal in het buisvormige element tegen het oppervlak van de binnenmuur is bevestigd.A method of installing means for extracting moisture from a cavity wall structure comprising an inner wall, an outer wall and a cavity therebetween, the method comprising providing a hole in the outer wall, and attaching a tubular porous moisture-permeable element that extending between the inner wall and the hole in the outer wall such that an enclosed space in the cavity is formed by the element in air communication with the air outside the outer wall, while the cavity between the inner wall and the outer wall is substantially through the element is sealed from the air outside the outer wall, characterized in that at least the closest at least one corner of the building is a mat of heat-insulating material in the tubular element against the surface of the inner wall.
NL2007920A 2011-12-02 2011-12-02 A building having a cavity wall structure, an element for extracting moisture from a cavity wall structure, and a method for installing means for abstracting moisture from a cavity wall structure. NL2007920C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2007920A NL2007920C2 (en) 2011-12-02 2011-12-02 A building having a cavity wall structure, an element for extracting moisture from a cavity wall structure, and a method for installing means for abstracting moisture from a cavity wall structure.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2007920 2011-12-02
NL2007920A NL2007920C2 (en) 2011-12-02 2011-12-02 A building having a cavity wall structure, an element for extracting moisture from a cavity wall structure, and a method for installing means for abstracting moisture from a cavity wall structure.

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NL2007920A true NL2007920A (en) 2013-06-05
NL2007920C2 NL2007920C2 (en) 2013-06-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015102486A2 (en) 2013-12-30 2015-07-09 Schrijver Vochtbestrijding B.V. Device for extracting moisture from a wall

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH229804A (en) * 1942-12-18 1943-11-30 Fasson Leo Device for dehumidifying walls.
NL8500177A (en) * 1985-01-23 1986-08-18 Hendrik Willem Rudolf Koster Brick wall moisture-extraction equipment - has protruding bell-shaped component in mating opening leaving continuous passage between
EP0829587A1 (en) * 1996-09-13 1998-03-18 Schrijver Systeem Vochtbestrijding N.V., naamloze vennootschap. Improved device to abstract moisture from a wall or similar

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH229804A (en) * 1942-12-18 1943-11-30 Fasson Leo Device for dehumidifying walls.
NL8500177A (en) * 1985-01-23 1986-08-18 Hendrik Willem Rudolf Koster Brick wall moisture-extraction equipment - has protruding bell-shaped component in mating opening leaving continuous passage between
EP0829587A1 (en) * 1996-09-13 1998-03-18 Schrijver Systeem Vochtbestrijding N.V., naamloze vennootschap. Improved device to abstract moisture from a wall or similar

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015102486A2 (en) 2013-12-30 2015-07-09 Schrijver Vochtbestrijding B.V. Device for extracting moisture from a wall
EP3553239A1 (en) 2013-12-30 2019-10-16 Schrijver Vochtbestrijding B.V. Device for extracting moisture from a wall

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