JP2020059971A - Composite body for constructing mortar wall body, mortar wall body using the same, and its construction method - Google Patents

Abstract

To provide a composite body for constructing a mortar wall body capable of being easily worked into an appropriate shape, easily applied with mortar on the surface side, and used for constructing the mortar wall body capable of forming a ventilation layer on the back side, the mortar wall body using the composite body, and its construction method.SOLUTION: A composite body 1 for constructing a mortar wall body is made by laminating: a net material 9 for direct coating formed in a vertical wave shape by molding a plastic net having a hole diameter through which aggregate used for mortar can pass; a first backing material 6; a ventilation net material 5 formed in a transverse wave shape by forming a plastic net having a hole diameter capable of ventilation; and a second backing material 2, and then integrated.SELECTED DRAWING: Figure 1

Description

  INDUSTRIAL APPLICABILITY The present invention is a composite for mortar wall body construction that can be easily processed into an appropriate shape, can be easily applied with mortar on the front surface side, and can be used to construct a wall body with a ventilation layer formed on the back surface side. The present invention relates to a body, a mortar wall body using the body, and a construction method thereof.

  As the mortar wall body, for example, inner and outer walls of buildings are known. Among them, to construct the outer wall of the building, a waterproof layer is formed on the structural material such as columns and beams, and if a ventilation layer is required, the vertical furring strip or the horizontal furring strip is fixed at predetermined intervals, and A method is known in which a lath net is fixed to the furring strip and various mortar compositions are applied to the surface side of the lath net. As the lath net, a wire-lattice wire lath made by braiding an iron wire and a metal lath made by cutting a metal plate and extending it are well known.

The lath net used in these mortar outer walls is a base reinforcement material for mortar coating, has an action of preventing mortar from peeling and cracking, and also contributes to the strength and fire resistance of the entire wall surface.
On the other hand, since the lath net is made of a metal material, it has a high weight, which causes a problem of increasing the weight of the entire mortar wall surface, and in addition to that, it also causes problems such as corrosion in terms of rust prevention. was there.

On the other hand, plastic nets made of plastic are permeable to liquids and gases and are lightweight, so that they are used for various daily necessities such as flower pots. As a use other than that, a use method as described in Patent Document 1 is also proposed.
Further, Patent Document 2 proposes a corrugated sheet in which a plastic net is processed into a wavy shape and a manufacturing method thereof.

Japanese Patent No. 2923501 Japanese Patent No. 5856706

However, Patent Document 1 is a proposal to use a plastic mesh in a tire and is used for a purpose unrelated to the mortar wall body. Further, Patent Document 2 describes that it is used as a laying sheet for air-permeable applications such as roofs and walls in buildings such as houses and as a civil engineering / construction material. It is supposed to be used.
Regarding the problem of lath net mentioned above, if only the problem of rust (corrosion) is concerned, solutions such as applying various rust preventive treatments to the surface of the lath are known. Is also commercialized.
However, it is well known that, even with the measures described above, the initial rust preventive performance cannot be maintained by the rust preventive treatment over a period of 10 to 50 years.
Regarding the problem of the heavy weight of the lath net, if the diameter of the opening (hole diameter) is made as large as possible, weight reduction can be expected to some extent, but strength reduction is also predicted, so it is extremely difficult to solve this problem. Expected

  In view of the above-mentioned circumstances, the present inventor uses various types of plastic corrugated sheets, which are also used in the above-mentioned Patent Document 2 and the like, in combination on the front surface side and the back surface side, thereby performing various types of mortar wall construction. The present invention has been completed by finding out that a composite having a property that can be used for

  That is, the present invention is a mortar wall construction composite that can be easily processed into an appropriate shape, can be easily applied with mortar on the front side, and can form a ventilation layer on the back side, a mortar wall using the same The purpose is to propose a body and its construction method.

  The present invention has been proposed in view of the above, and a direct coating net material formed by longitudinally corrugating a plastic net having a pore size through which an aggregate used for mortar can pass, a first backing material, and ventilation are possible. A composite for mortar wall construction (hereinafter, referred to as a four-layer structure), which is formed by laminating a ventilation net material formed by forming a plastic net having a wide pore size into a transverse wave shape and a second backing material by laminating them. Called a complex).

  Further, the present invention is a mortar wall body using the four-layer composite, wherein the composite is fixed to a base so that the second backing material faces each other, and the four-layer composite is fixed. The present invention also proposes a mortar wall body using a composite for mortar wall construction, characterized in that the mortar is applied to the net material for direct coating located on the outermost surface side.

  Furthermore, the present invention is a method for constructing a mortar wall body that does not use the four-layer composite, wherein the direct-coating net material and the first backing material are heat-sealed in advance, and the ventilation net is provided. Material and the second backing material are adhered to each other, and the respective adhesive composites are combined and fixed to the base so that the wave of the direct coating net material and the wave of the ventilation net material are orthogonal to each other. It is characterized by that.

  Furthermore, the present invention is a method of constructing a mortar wall body using the four-layer composite, comprising a first step of fixing the composite so that the second backing material faces the base, and The second step of applying mortar to the net material for direct coating which is located on the outermost surface side of the four-layer composite body fixed in the first step, and the mortar wall body construction. It also proposes a law.

The structure for mortar wall construction of the present invention is a corrugated sheet obtained by processing two types of plastic nets into a corrugated form, which is combined and integrated so that the wave directions are orthogonal to each other, and mortar is provided on the surface side. It can be easily applied by coating and can be easily used for applying a mortar wall body on which a ventilation layer can be formed on the back surface side. In particular, since the mortar is applied to the net material for direct application, it is possible to reduce one-sided wear and abrasion that occur when a plaster tool such as a spatula is used for a metal object such as a lath net.
Further, since this four-layer composite has remarkable lightness and high workability, it can be easily cut (worked) into an appropriate shape and is excellent in handleability. Therefore, it is possible for an elderly person, a woman or the like having a relatively low strength to easily perform processing and various kinds of work.
Furthermore, since this four-layer composite uses a plastic mesh, it does not cause the problems of high weight and rust (corrosion), which were the problems of the conventional lath mesh, but it prevents the peeling and cracking of mortar. The same effect is provided.
Even if the ventilation layer is not necessarily required, since the layer is an extremely lightweight layer, it is possible to construct an extremely lightweight wall body by using this four-layer composite.

  Further, since the mortar wall of the present invention uses the above-mentioned structure, it does not cause the problems of high weight and rust (corrosion) when using the conventional lath net as described above, and does not crack. It is an extremely lightweight wall body that has excellent resistance to, has stable quality, and can be used for various purposes such as interior and exterior walls for houses. And it is expected to be a bearing wall with excellent durability that can obtain stable wall magnification.

  Further, among the mortar wall construction methods of the present invention, in the construction method that does not use the four-layer composite, the direct-coating net material and the first backing material are heat-sealed in advance, and the ventilation net material and The backing material of 2 is adhered to each other, and the respective adhesive composites are combined and fixed so that the wave of the direct-coating net material and the wave of the ventilation netting material are orthogonal to each other. It suffices to transport the adhesive composite of the type, and it is difficult to cause an accident such as separation during transportation.

  Further, in the method for constructing a mortar wall body using the four-layer composite of the present invention, the first step is a step of fixing the extremely lightweight four-layer composite to the base as described above, and therefore, for example, It may be fixed by using a fixing tool such as a staple as in the conventional method using a lath net, may be fixed by an adhesive agent, or even if the fixing tool is similarly used, it is rare. The number can be fixed to the base. Since the weight of the plastic net including the mortar is extremely light, the weight acting on the fixture for holding it is also light.

It is a perspective view which shows an example of the composite body for mortar wall construction of this invention. It is a perspective view which shows one Example of the mortar wall body using the composite for mortar wall body construction of this invention. (A) It is a horizontal sectional view of the mortar wall of FIG. 2, (b) It is a vertical sectional view. FIG. 3A is a horizontal sectional view in which the mortar wall body of FIG. 2 is further enlarged, and FIG.

  The composite for mortar wall construction of the present invention comprises, as a first layer, a direct-coating net material formed by longitudinally corrugating a plastic net having a pore size through which aggregate used for mortar can pass, and a first layer as a second layer. A backing material (waterproof paper), a ventilation net material formed as a third layer in a transverse corrugated form of a plastic net having a pore size that allows ventilation, a second backing material (moisture permeable waterproof sheet) as a fourth layer, Is laminated and integrated.

Hereinafter, each layer will be described.
First, the first layer is a net material for direct coating, which is formed by longitudinally corrugating a plastic net having a hole diameter (mesh interval) through which aggregate used for mortar can pass.
The net material for direct coating is a continuous first corrugated three-dimensionally processed corrugated sheet (corrugated sheet), and has pore diameters (mesh intervals) through which aggregate used for mortar can pass. The "first" is for distinguishing from the plastic net of the third layer. Specifically, polypropylene, saturated polyester, polyester, polyvinyl chloride, ABS resin, polyethylene, polystyrene and the like are used.
Therefore, the hole diameter (mesh interval) is preferably about 5 to 8 mm.
For continuous wavy processing, a height of about 5 to 15 mm and a width of about 15 to 20 mm are desirable.
The first-layer net material for direct coating is combined with a later-described third-layer net material for ventilation so that their wave directions are orthogonal to each other, and is integrated.

  Next, the second layer is the first backing material (waterproof paper). The "first" is for distinguishing from the backing material (moisture-permeable waterproof sheet) of the fourth layer, but this waterproof paper is waterproof paper (nonwoven fabric) for preventing mortar from seeping out. .

Further, the third layer is a ventilation net material formed by laterally corrugating a plastic net having a pore size (mesh interval) that allows ventilation.
This mesh material for ventilation is a corrugated sheet in which a planar second plastic net is three-dimensionally processed into a continuous wave shape, and has a hole diameter (mesh interval) that allows ventilation. The "second" is for distinguishing from the plastic net of the first layer. Specifically, polypropylene, saturated polyester, polyester, polyvinyl chloride, ABS resin, polyethylene, polystyrene and the like are used.
Therefore, the hole diameter (mesh interval) is preferably about 2 to 5 mm.
For continuous wavy processing, a height of about 10 to 30 mm and a width of about 20 to 40 mm are desirable.
As described above, the ventilation net material of the third layer is combined and integrated with the direct coating net material of the first layer so that the wave directions thereof are orthogonal to each other.

  Next, the fourth layer is a second backing material (moisture permeable waterproof sheet). The "second" is for distinguishing from the backing material (waterproof paper) of the second layer, but this moisture-permeable waterproof sheet (nonwoven fabric) is used for moisture etc. from the wall side (indoor side). It is a so-called moisture-permeable waterproof sheet, which is a performance for letting out water and a performance for preventing moisture such as rainwater from flowing into the room from the side of the ventilation layer of the third layer.

The first and second plastic nets may have braided openings or punched openings.
Regarding the direction of the corrugated three-dimensional processing in the two kinds of corrugated sheets, either one was set to the length direction and the other was set to the direction (width direction) orthogonal to it.

  Moreover, the height and width of the continuous wave in the net material for direct coating of the first layer are not particularly limited as long as the mortar to be coated sufficiently passes therethrough, but as described above, the height is about 5 to 15 mm, A width of about 15 to 20 mm is desirable. The hole diameter (mesh interval) of the first layer is preferably about 5 to 8 mm as described above.

The height and width of the continuous wave in the third layer of ventilation net material are not particularly limited as long as ventilation can be sufficiently performed, but as described above, the height is about 10 to 30 mm and the width is 20 to 20 mm. About 40 mm is desirable. If there is a desired ventilation interval (= width interval of the ventilation layer), it may be formed in that width. The hole diameter (mesh spacing) of the third layer is preferably about 2 to 5 mm as described above.
Because of this combination, it is desirable that the ventilation net material be formed to be relatively hard. Therefore, it is desirable to select a relatively hard plastic as the type of plastic used. This is because the soft plastic is crushed by the pressure in the thickness direction and cannot secure a ventilation layer having a desired thickness.

  Subsequently, a construction method that does not use such a four-layer composite and a construction method that uses the four-layer composite will be described below. As the base, there are structures or sub-structures, specifically, structures such as columns and beams, or sub-structure materials such as braces, studs, furrows, and sub-furnitures.

In the construction method that does not use the four-layer composite, the direct-coating net material and the first backing material are heat-sealed in advance in a factory or the like, and the ventilation net material and the second backing material are used together. Glue.
That is, the first layer and the second layer are heat-sealed, and the third layer and the fourth layer are bonded together.
Then, the respective adhesive composites (two-layer composites) are transported to the site, combined so that the wave of the direct coating net material and the wave of the ventilation net material are orthogonal to each other, and fixed to the base.

Specifically, without adhering each adhesive composite (two-layer composite) to each other, a method of fixing the adhesive composites (two-layer composites) to the substrate in series using staples and bonding each adhesive composite (two-layer composite) with an adhesive or the like. Then, after preparing the four-layer composite, there is a method of fixing the four-layer composite on the base with staples or the like.
At the time of attachment to the base, the second backing material is fixed so as to face the base.
As the subsequent step, like the second step of the construction method using the four-layer composite described later, mortar is applied to the surface layer (first layer) so that at least the net material for direct application becomes invisible. Apply mortar.

In the construction method using the above-mentioned four-layer composite, the above-mentioned four-layer composite is prepared in a factory or the like, and the four-layer composite is transported to the site for construction.
Then, in a first step, the four-layer composite body is fixed to these substrates, and various kinds of staples or the like are used as the fixing tool.
This staple is also used for fixing a conventional lath net, and at least the burden of the weight of the lath net is not imposed, so that the number of staples used can be reduced. Alternatively, the fastening interval can be increased. In addition, at the time of attachment to the base, the second backing material is fixed so as to face the base.

  Subsequently, in a second step, mortar is applied to the surface layer (first layer) of the four-layer composite fixed to the base, and mortar is applied so that at least the net material for direct coating cannot be seen. Form a finishing layer.

These construction methods, that is, the method using the four-layer composite and the method using the two-layer composite, have the advantage of being extremely easy to construct as compared with the construction method of forming a ventilation layer using a conventional lath net. is there.
For example, in the conventional method for constructing a ventilation layer using a lath net, the following steps are essential.
First, carpenters
・ Install a breathable waterproof sheet on the base.
-Fix the ventilation furring strips to the ground with fasteners such as nails.
・ Lasers such as narrow boards and rough boards are stretched from above.
After that, plasterers,
・ Fix the lath net with waterproof paper (or fix the lath net after stretching the waterproof paper).
・ Apply mortar.
On the other hand, in the construction method of the present invention, many steps and members can be simplified and substantially eliminated as described above, and the construction can be easily performed without depending on the skilled worker for the work.

Since the mortar wall body constructed in this manner uses a four-layer structure in which the two types of corrugated sheets are combined, as described above, high weight and rust prevention when using a conventional metal lath ( It is an extremely lightweight wall body having excellent resistance to cracking and stable quality without causing the problem of (corrosion), and can be used for various purposes such as interior and exterior walls for houses. And it is expected to be a bearing wall with excellent durability that can obtain stable wall magnification.
In particular, conventional metal lath nets, especially stainless steel lath nets, were good in terms of rust prevention and obtained high strength and fire resistance, but as mentioned above, in addition to the problem of high weight, cost It was also difficult to put it into practical use in terms of construction. However, in the four-layer structure in which the two kinds of corrugated sheets of the present invention are combined, deterioration promotion due to the generation of rust is never promoted, so that the initial yield strength can be maintained, the wall magnification can be obtained, and the cost, It is expected that it will be easy to put into practical use in terms of construction.

  FIG. 1 shows an embodiment of the composite for mortar construction of the present invention, where reference numeral 1 is the composite for mortar construction (four-layer composite), 2 is the second backing material (moisture permeable waterproof sheet). ) 3 is an adhesive, 4 is an adhesive, 5 is a ventilation net material (third layer), 6 is a first backing material (waterproof paper), 7 is a ventilation net material, 8 is a heat-sealing contact, Reference numeral 9 indicates a net material for direct coating (first layer).

The net material for direct coating (corrugated sheet) 9 in the example was made of polypropylene net having a hole diameter of 5 mm; "Corgate 1" manufactured by Act Co., so that the height Y was 10 ± 1 mm and the width was 10 mm. It is processed into a continuous wavy shape.
The ventilation net material (corrugated sheet) 5 (7) in the example is a polypropylene net having a hole diameter of 1 mm; "Corgate 2" manufactured by Act Co., with a height X of 20 ± 2 mm and a width of 20 mm. It is processed into a continuous wave shape so that
The waves of the net material for corrugation (corrugated sheet) 9 are combined in a longitudinal wave shape in the drawing, and the waves of the ventilation material (corrugated sheet) 5 (7) are combined in a lateral wave shape.
Further, the moisture-permeable waterproof sheet 2 in the embodiment is “Skyone 2” manufactured by KST Co., Ltd.
Further, the waterproof paper 6 in the embodiment is a waterproof paper manufactured by CPE Co., Ltd.

  Note that, as described above, reference numerals 3 and 4 indicate adhesives, respectively. The adhesive 3 in this example is an adhesive used for bonding the waterproof paper 6 and the ventilation net material 5 (7); "Bond GP Clear" manufactured by Konishi Co., Ltd., and the adhesive 4 is a moisture-permeable waterproof sheet. 2 is an adhesive used for adhering the ventilation net member 5 (7); "KSTNO1" manufactured by KST Co., Ltd. Further, the heat-sealing contact 8 is formed by laminating the waterproof paper 6 and the direct-coating net material 9 with heat and pasting them together.

  In order to create such a mortar construction composite 1, a moisture-permeable waterproof sheet 6 which is a first backing material is bonded to the back surface of the direct-coating net material 9 in advance by heat fusion 8 to form a ventilation net. The waterproof paper 2 which is the second backing material may be bonded to the back surface of the material 5 (7) using the adhesive 4, and these two-layer composites may be bonded using the adhesive 3; You may make it join each. When the two-layer composites are bonded together, the corrugated sheets are combined so that the waves of the corrugated sheets are orthogonal to each other as described above.

FIG. 2 shows an embodiment of a mortar wall body using the composite for mortar wall construction (four-layer composite body), where reference numeral 11 is a load supporting member, 12 is a stud, and 13 is an interior material. , 14 is a structural face material, 15 is an airtight material, 16 is a connecting material, and 17 is a heat insulating material. The distance Z between the load supporting member 11 and the stud 12, which corresponds to the vertical furring strip, and between the studs 12 and 12 is 500 mm or less. Further, reference numeral 18 is a lightweight cement mortar, 19 is an exterior material, 20 is a drainer, 21 is a floor material, 22 is a floor joist, 23 is a joist, and 24 is a foundation.
In this figure, the front side is the outdoor side and the depth side is the indoor side.

FIG. 3 is a side view of the mortar wall body of FIG. 2, in which reference numeral 25 is a base and 26 is a connecting material. Further, FIG. 4 is an enlarged view thereof, in which 27 is a waterproof paper fastening material, 28 is a structural surface material fastening material, 29 is a composite material fastening material, 30 is an interior material fastening material, and 31 is an interior material. A joint treatment material, 32 is a joining material fastening material, and 33 is an airtight material fastening material.
In addition, the code | symbol A is a ventilation layer space | interval, B is the thickness of the load support member 11, C is the mortar layer thickness, D is the thickness of the structural face material 14, E is the thickness of the interior material 13, and F is the total thickness of the wall body. Show.
In these figures, "OUT" indicates the outdoor side and "IN" indicates the indoor side.

  In the construction example, A is 20 mm or more, B is 105 mm or more, C is 15 mm or more, D is 9 mm or more, E is 9.5 mm or more, and F is 158.5 mm or more.

The mortar wall thus constructed has a high weight when using a conventional lath net and does not cause any problems of rust prevention (corrosion), has excellent resistance to cracking, has stable quality, and is extremely lightweight. It was confirmed that it can be used for various purposes such as interior and exterior walls for houses as a wall.
As an example, about the fire prevention test; 30 minutes fire approval has been obtained from the Ministry of Land, Infrastructure, Transport and Tourism as of July 27, 2018 (based on the Building Standard Act Article 2 No. 8 Established by "The Fire Prevention Performance Test / Evaluation Procedure Manual" 4.3 According to the fire performance test method).
Regarding the proof stress test, the wall magnification in the "in-plane shear test" conducted on September 25, 2018 at Nakao Laboratory of Yokohama National University was 3.39. In addition, the Ministry of Land, Infrastructure, Transport and Tourism is planning to apply for a wall magnification test.
In this way, it has been confirmed one after another that it also meets certain fire resistance standards, and good test results have been obtained regarding crack resistance and many building standards. And it is expected to be a bearing wall with excellent durability that can obtain stable wall magnification.

1 Composite for mortar construction 2 Second backing material (moisture permeable waterproof sheet)
3 Adhesive 4 Adhesive 5 and 7 Ventilation net material (3rd layer, corrugated sheet)
6 First backing material (waterproof paper)
8 Thermal fusion contact 9 Direct coating net material (1st layer, corrugated sheet)

The present invention has been proposed in view of the above, a straight-coating for network material plastic net is formed vertically undulating aggregate were kneaded in a mortar having a passable pore size, and the first backing material a ventilation network material plastic net is formed in the lateral wave having a pore size capable of ventilation, and a second backing material, the and the transverse wave longitudinal wave and the ventilation network material straight paint for network material The present invention relates to a composite for mortar wall construction (hereinafter, referred to as a four-layer composite), which is characterized by being combined so as to be orthogonal to each other and integrated in a laminated form .

Further, the present invention, the a mortar wall body using a four-layer composite, wherein the complex base second backing material is fixed to face, fixed outermost surface of the composite The present invention also proposes a mortar wall body using a composite for mortar wall body construction, characterized in that the mortar is applied to the net material for direct coating located on the side.

Furthermore, the present invention provides the a method of applying mortar wall body using a four-layer composite, a first step of the second backing the complex underlying Ru fixed so as to face, A second step of applying mortar to the net material for direct coating which is located on the outermost surface side of the composite body fixed in the first step, and a second step of applying the mortar wall body. Is also proposed.

The structure for mortar wall construction of the present invention is a corrugated sheet obtained by processing two types of plastic nets into a corrugated form, which is combined and integrated so that the wave directions are orthogonal to each other, and mortar is provided on the surface side. It can be easily applied by coating and can be easily used for applying a mortar wall body on which a ventilation layer can be formed on the back surface side. In particular, since the mortar is applied to the net material for direct application, it is possible to reduce one-sided wear and abrasion that occur when a plaster tool such as a spatula is used for a metal object such as a lath net. Further, since the bending stress of the molded net material of each plastic net is offset and it is difficult for the plastic net to be rolled in any direction, it is possible to carry out the work without any trouble at the time of installation and the like. Moreover, it is lightweight but maintains a flat shape, and because it is corrugated, it is hard to be blown away by the wind.
Further, since this four-layer composite has remarkable lightness and high workability, it can be easily cut (worked) into an appropriate shape and is excellent in handleability. Therefore, it is possible for an elderly person, a woman or the like having a relatively low strength to easily perform processing and various kinds of work.
Furthermore, since this four-layer composite uses a plastic mesh, it does not cause the problems of high weight and rust (corrosion), which were the problems of the conventional lath mesh, but it prevents the peeling and cracking of mortar. The same effect is provided.
It should be noted that even if the ventilation layer is not necessarily required, the layer is an extremely lightweight layer, so that by using this four-layer composite, an extremely lightweight wall body can be constructed.

The composite for mortar wall construction of the present invention comprises a direct-coating net material formed by longitudinally corrugating a plastic net having a large number of pores having a pore diameter through which the aggregate used for mortar can pass, and the second layer. As a first backing material (waterproofing paper), as a third layer a ventilation net material formed by transverse corrugation of a plastic net having a large number of holes having a diameter allowing ventilation, and as a fourth layer a second backing material (Moisture-permeable waterproof sheet) is laminated and integrated.

Claims (4)

  A direct-coating net material formed by longitudinally corrugating a plastic net having a pore diameter through which the aggregate used for mortar can pass, a first backing material, and a ventilation pipe formed by laterally corrugating a plastic net having a ventable pore diameter. A composite for mortar wall construction, characterized in that a netting material and a second backing material are laminated and integrated.   2. The composite according to claim 1 is fixed to a base so that the second backing material faces each other, and mortar is applied to the direct coating net material located on the outermost surface side of the fixed composite. A mortar wall body using a composite for mortar wall construction.   The direct-coating net material according to claim 1 and the first backing material are heat-sealed in advance, and the ventilation net material and the second backing material are adhered to each other in advance. A method of constructing a mortar wall body, characterized in that the composite is fixed to a base by combining the waves of the net material for direct coating and the waves of the ventilation net material at right angles.   A first step of fixing the composite according to claim 1 to a base so that the second backing material faces each other, and a position on the outermost surface side of the composite fixed in the first step. A second step of applying mortar to the net material for direct coating, which comprises: a mortar wall construction method.