JP2006052538A - Ventilation function-equipped exterior wall structure of building, and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relatively simple and inexpensive exterior-wall ventilation structure of a building, which enables a good ventilation layer to be formed in an exterior wall, which enhances water-leakage prevention properties, and which is excellent in fire resistance and durability. <P>SOLUTION: In this exterior-wall ventilation structure of the building, a spacer member 2 for forming the ventilation layer is interposed between the outer surface side of a building skeleton 1 and the side of a mortar layer 5. The spacer member 2 is composed of a lath net for ventilation, where many protrusions 21 protruding toward the outer surface side of the building skeleton 1 are press-formed and scattered all over a metal lath net-like base material 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an outer wall structure having a ventilation function suitable for preventing condensation in a wooden building.

  In recent years, with the progress of high airtightness and high thermal insulation of buildings, internal condensation on the outer wall of wooden buildings has become a problem, and as a countermeasure against this, outer wall ventilation with a ventilation function inside the outer wall has become a problem. The structure has been favored and implemented.

  Conventionally, such an outer wall ventilation structure generally has a breathable waterproof paper 102 attached to the outer surface of a building housing 101 as shown in FIG. 8, and a breathable layer is formed on the outer surface via the moisture permeable waterproof paper 102. A plurality of wooden vertical bars 103 called so-called ventilator rims for forming S are juxtaposed at a pitch of 450 mm, for example, and a lath net 104 having backing paper is attached to the outside of the vertical bars 103, A mortar layer 106 is formed by applying mortar so that the lath net 104 and the alkali-resistant glass net 105 are embedded while laying an alkali-resistant glass net 105 for preventing cracks from above.

  In the outer wall structure, the vertical beam 103 serves as a spacer member for forming a ventilation layer, and a ventilation layer S is formed between the outer surface side of the building housing 101 and the mortar layer 106 side.

  However, in such a conventional general outer wall ventilation structure, since the pitch of the plurality of vertical bars 103 arranged in parallel to each other is relatively wide as about 450 mm, the support interval of the lath net 104 embedded in the mortar layer 106 is small. For this reason, the mortar layer 106 tends to sag between the vertical bars 103 as shown by a chain line in FIG. In this case, the dimension of the air-permeable layer S tends to be unstable.

  Due to these, cracks and the like are likely to occur in the mortar layer 106, and in addition, the shrinkage and drying of the vertical bars 103 promotes the generation of the cracks, and there is a risk of intrusion of rainwater through the cracks.

  Although it is possible to shorten the pitch of the vertical bars 103 or increase the strength of the lath net 104 to prevent the mortar layer 106 from drooping, in addition to the cost increase, the former reduces the number of effective ventilation layers. However, in the latter case, increasing the strength leads to problems such as deterioration of workability such as cutting of a lath net, and none of them is realistic.

  Also, in the construction work, when the carpentry work of the building frame 101 is completed, it is usual to start plastering work such as lath netting process or mortar coating, but when transferring to the plastering work, The re-engagement of the carpentry work for fixing the crosspiece 103 also has a problem that the work setup becomes complicated.

  Furthermore, since the air-permeable layer S is intermittently interrupted by the vertical beam 103, for example, as shown in FIG. 9, when the window P is provided on the outer wall, the vertical beam 103 above and below the window P is cut away so that the air The ventilation layer must be continuous so that it flows in the lateral direction, and a partial modification plan and construction work for connecting the ventilation path according to the form of the outer wall surface of the building are required. End up.

  Recently, as shown in FIG. 10, a surface layer 201 made of paper or a film and formed with a number of convex spherical portions 202 by embossing is attached to the asphalt compound layer 203. A construction method has been proposed in which the waterproof face material 200 is used as a spacer member for forming a ventilation layer (see, for example, Patent Document 1).

Further, as shown in FIG. 11, a method of using a corrugated cardboard 300 in which a flat cardboard 302 is pasted on a corrugated cardboard 301 for forming the air-permeable layer S as a spacer member has been proposed (for example, a patent). Reference 2).
Japanese Patent No. 3326602 (page 4, FIG. 1) Japanese Patent Laid-Open No. 11-287025 (second page, FIG. 2)

  However, in the former case, it is possible to form the air-permeable layer S without using the vertical beam by using the waterproof surface material 200 having the convex spherical portion 202. Since 200 has a two-layer structure, it is difficult to manufacture itself, and it is relatively difficult to emboss the convex spherical portion 202 having an appropriate height on the surface layer 201, resulting in high costs. .

  In the latter case, the spacer member for forming the air-permeable layer S is the corrugated cardboard 300. Therefore, although it can be provided at a relatively low cost, it is inferior in durability and has a great problem in terms of fire resistance. Yes, not practical.

  The present invention has been made in view of the above circumstances, and can be formed relatively easily and inexpensively to form a suitable space as a ventilation layer on the outer wall, improving water leakage prevention performance, fire resistance and durability. It is an object to provide an outer wall structure of a building that can be excellent in performance.

  In order to solve the above problems, the present invention is formed on the outer surface of the waterproof paper in a state where the lath net for mortar laid on the outer surface side of the building frame via the waterproof paper and the lath net for mortar are embedded. An outer wall structure of a building comprising a spacer member for forming a ventilation layer between an outer surface side of the building housing and a mortar layer side, wherein the spacer member has a metal lath network base An outer wall structure having a ventilation function for a building, characterized by comprising a lath net for ventilation formed by projecting a large number of projections projecting toward the outer surface of the building frame over the entire area of the material It is related to.

  The convex portion in the ventilation lath net is set in a range of 3 to 18 mm in height. The height of this convex part defines the height or thickness of the ventilation layer, and if it is less than 3 mm, it is difficult to ensure a sufficient ventilation function. In some cases, this not only causes an excessive increase in the thickness of the outer wall but also causes instability of the mortar layer.

  In addition, the present invention relates to a method for constructing the outer wall, and as a spacer member for forming a ventilation layer, a large number of projecting portions projecting toward the outer surface of the building frame project in a scattered state over the entire area of the metal lath net-like base material. The ventilation lath net is provided, and the ventilation lath net is disposed and fixed on the outer surface of the outer wall lower plate so that the convex portion faces the outer wall lower plate of the building frame, and then the ventilation A mortar lath net is laid on the outer surface of the lath net for waterproofing through a waterproof paper, and then the mortar is applied in such a manner that the lath net is embedded from above the lath net for mortar. .

  According to the outer wall ventilation structure of the building of the present invention, without using a vertical rail as a ventilation trunk edge, it is a simple operation of simply laying a ventilation lath net formed with a plurality of projections, and Inexpensive, a good ventilation layer can be secured between the outer side of the building frame and the mortar layer side, and the installation of ventilation lath nets and the attachment of waterproof paper and lath nets for mortar are a series of lath construction. Then, following the mortar construction, the flow of the work process can be maintained smoothly.

  In particular, if the set interval between the convex portions is set appropriately, deformation of the mortar layer can be suppressed, and the occurrence of water leakage due to cracks can be reliably prevented.

  Also, even when a window is provided on the outer wall, the direction of ventilation is omnidirectional, unlike the case of using a conventional vertical beam, and a continuous ventilation layer can be easily formed without modifying the structure around the window. Needless to say, since the convex portion itself is air permeable in a part of the lath net, the overall air permeability is further enhanced.

  In addition, since the ventilation lath net is made of metal, it has excellent durability, and there is no concern about fire resistance.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a sectional view showing an outer wall structure of a wooden house according to an embodiment of the present invention.

  In FIG. 1, the outer wall structure of this building has a ventilation lath net 2 as a ventilation layer forming spacer member disposed on the outer surface of the building housing 1, a waterproof paper 3, and a mortar lath net 4. A mortar layer 5 and an exterior decorative layer 6 are provided.

  The ventilation lath net 2 as the spacer member is attached to the outer surface of the building housing 1 by means of fasteners 11 such as tucker and staples, specifically on the outer surface of the outer wall underlaying plate 1a made of plywood or the like in the building housing 1. It is fixed to form a ventilation layer S between the outer surface side of the building housing 1 and the mortar layer 5 side.

  As shown in FIG. 3, the ventilation lath net 2 is a metal lath net formed by press-forming a large number of convex portions 21 projecting toward the building housing 1 over the entire area of the lath net base material 20. For example, it is composed of a high tension lath net. The fixing of the ventilation lath net 2 with the fastener 11 is performed at the convex portion 21 as shown in FIG.

This ventilation lath net 2 is formed from a rust-proofed cold rolled steel sheet. As a specific example, for example, the unit weight is 1.0 kg / m ² and the lateral width W is 1820 mm. The vertical length H is 600 mm, and a plurality of ventilation lath nets 2 are used side by side as shown in FIG. 2 during construction.

  The lath size (L × l in FIG. 4) of the ventilation lath net 2 is, for example, about 10 mm × 7 mm. Of course, this lath net 2 for ventilation can be arbitrarily selected without being restricted by the above-mentioned standards as long as it is not bent during construction of the mortar or does not interfere with the cutting work at the site.

  The size of the lath is a fastener 12 such as a tucker or staple for fastening the waterproof paper 3 disposed on the outer surface side of the ventilation lath net 2 or the mortar lath net 4 embedded in the mortar layer 5. It is sufficient that the dimension is difficult to penetrate. Conversely, the fastener 12 having a shoulder width that does not penetrate the lath size of the ventilation lath net 2 may be selectively used.

  Moreover, the planar size of the convex part 21 formed in the lath net 2 for ventilation is, for example, several of the laths in the lath net base material 20, and has a pitch d of 40 to 50 mm, for example, over the entire area of the base material 20. It is formed in a staggered arrangement.

  The height t of the convex portion 21 determines the thickness of the ventilation layer S, that is, the gap width of the ventilation space, and is usually in the range of 3 to 18 mm in the climatic environment of the region used (general ground, cold district, etc.). The difference may be set to a more suitable dimension. In general, the preferred height t is about 5 to 10 mm.

  Moreover, since it is necessary to ensure the ventilation layer S stably over a long period of time, it is preferable to use the ventilation lath net 2 that has been subjected to a rust prevention treatment or the like for enhancing durability.

  The waterproof paper 3 is a conventional general-purpose waterproof sheet such as tarpaulin paper, and is stretched on the outer surface side of the ventilation lath net 2.

  The mortar lath net 4 is disposed on the outer surface side of the ventilation lath net 2 via a waterproof paper 3, and the fastener 12 such as the tucker or staples is disposed on the outer surface side of the building housing 1. It is fixed by.

  The mortar layer 5 is applied to the outer surface side of the ventilation lath net 2 with the mortar lath net 4 embedded therein.

  The exterior decorative layer 6 is applied to the outer surface of the mortar layer 5 with a water-resistant paint made of resin or ceramic as a finishing layer.

  Next, the construction procedure of the outer wall of the wooden house having the above configuration will be described.

  First, as shown in FIG. 5, the ventilation lath net 2 is arranged so that the convex portion 21 side of the ventilation lath net 2 faces the outer wall lower plate 1 a of the building housing 1, and this ventilation lath net 2 Is fixed to the outer surface of the outer wall underlaying plate 1a by using a fastener 11 such as a tucker or a staple.

  Thereafter, as shown in FIG. 6, a waterproof paper 3 is attached to the outer surface of the ventilation lath net 2, and then a mortar lath net 4 is laid on the waterproof paper 3.

  Next, as shown in FIG. 7, mortar coating is performed from above the mortar lath net 4 to form a mortar layer 5 in which the mortar lath net 4 is embedded. Finally, a resin having water resistance or the like is applied onto the mortar layer 5 to form the exterior decorative layer 6.

  In such a ventilation structure, even if the building is made highly airtight, the ventilation layer S maintains good air permeability in the outer wall, so that internal condensation in the wall can be effectively prevented.

  Further, since the spacer member for forming the ventilation layer S is composed of the ventilation lath 2, unlike the conventional configuration, it is restricted by the direction of ventilation unlike the configuration of the vertical beam. Therefore, it is possible to cope with a curved surface or the like on the outer surface of the building.

  Further, even when a window P is provided on the outer wall of the building frame as shown in FIG. 2, it is not necessary to modify the shape of the periphery of the window P for ventilation, and a special design plan for modification is required. Enforcement can be easily done without doing.

  In addition, the materials used, construction details, and construction process after fastening the ventilation lath net 2 are the same as the conventional general wet plastering outer wall construction, and not only the ventilation layer S can be formed accurately, but also the construction. Since it is simple and the lath net 2 for ventilation has a large number of projections 21, if the interval between the projections 21 is set appropriately, deformation of the mortar lath mesh 4 and the mortar layer 5 can be suppressed, Therefore, the risk of water leakage due to the occurrence of cracks in the mortar layer 5 can also be eliminated.

  In particular, the ventilation lath net 2 can be manufactured at a low cost, and the convex portion 21 itself can be ventilated. Therefore, the air flow is not affected by the convex portion 21, and therefore the ventilation performance is remarkably enhanced. Become.

  Further, since the ventilation lath net 2 is made of metal, the fire resistance is good and the durability is improved as compared with the case where the spacer member is formed of cardboard.

  The ventilation lath net 2 as the spacer member is not limited to the above-described high tension lath net, and, for example, an expanded metal can be used as long as the projection 21 itself can vent. It is.

  In addition, in the said Example of this invention, it is good also as what coats mortar at the time of construction of the mortar layer 5, laying the alkali-proof net for crack prevention according to a conventional construction method.

  Moreover, as one of the preferable modified embodiments, after a moisture-permeable waterproof paper is laid in advance on the outer wall surface of the building housing 1, that is, on the outer wall underlaying plate 1a, the moisture-permeable waterproof paper is further provided thereon. It is good also as what constructs the lath net 2 for ventilation. The outer wall structure in this case is such that moisture permeable waterproof paper, ventilation lath net, waterproof paper, mortar lath, mortar, and exterior decorative layer are constructed on the outer wall underboard in order.

  In short, the main feature of the present invention is to use a metal ventilation lath mesh for the ventilation layer forming spacer member, and in particular, to use a lath mesh having a large number of projections for forming the ventilation layer. As long as this characteristic point is included, various modified embodiments other than the specific configurations shown in the above-described embodiments are allowed.

It is sectional drawing which shows the outer wall of the wooden system house to which the outer wall ventilation structure of the building concerning embodiment of this invention was applied. It is explanatory drawing of the ventilation | gas_flowing aspect of a window periphery at the time of providing a window in the outer wall similarly. It is a perspective view which shows the structure of the ventilation lath net used as a spacer member for ventilation layer formation. It is explanatory drawing of the lath size of the lath net for ventilation. It is sectional drawing which shows the state which stretched the ventilation lath net on the outer surface of the building. It is sectional drawing which shows the state which laid the lath net for mortar on the lath net for ventilation through the waterproof paper. It is sectional drawing which shows the state which embedded the lath net | network for mortar and formed the mortar layer. It is sectional drawing which shows an example of the outer wall ventilation structure of the conventional building. It is explanatory drawing of the ventilation mode at the time of providing a window in the outer wall ventilation structure of FIG. It is explanatory drawing of the prior proposal example of the spacer member for ventilation layer formation. It is explanatory drawing of the other prior proposal example of the spacer member for ventilation layer formation.

Explanation of symbols

1 ... Building 2 ... Spacer member (Lath net for ventilation)
3 ... Waterproof paper 4 ... Lath net for mortar 5 ... Mortar layer 20 ... Lath net base material 21 ... ... Projections

Claims (3)

A lath net for mortar laid on the outer surface of the building frame via waterproof paper;
A mortar layer formed on the outer surface of the waterproof paper in a state where the lath net for mortar is embedded,
In the outer wall structure having the ventilation function of the building in which a spacer member for forming a ventilation layer is interposed between the outer surface side of the building housing and the mortar layer side,
The spacer member is composed of a lath net for ventilation formed by projecting a large number of convex portions projecting toward the outer surface of the building housing over the entire area of the metal lath mesh base material in a scattered state. The outer wall structure has the ventilation function of the building. The outer wall structure having a building ventilation function according to claim 1, wherein the convex portion has a height of 3 to 18 mm. As a spacer member for forming a ventilation layer, a lath net for ventilation formed by projecting a large number of convex portions projecting toward the outer surface of the building frame over the entire area of the metal lath net-like base material,
After arranging and fixing the ventilation lath net on the outer surface of the outer wall lower plate so that the convex portion faces the outer wall lower plate of the building frame,
Laying a mortar lath net on the outer surface of the vent lath net via waterproof paper,
Then, the construction method of the outer wall which has the ventilation function of the building characterized by applying mortar in the aspect which embeds this lath net from above the lath net for mortar.

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