JPS62211452A - Construction method of stacco outer wall - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for constructing an exterior wall of a building, and particularly to a method for constructing a stucco-like exterior wall.

[Prior art and its problems]

Most of the exterior walls of wooden buildings are made by fixing wood siding, waterproof paper, and lath netting with staples to adjacent materials such as pillar studs, then applying mortar to the lath base in the order of base coat, intermediate coat, and top coat. It has been done through a complicated process of applying decorative paint to the surface. On the other hand, with the westernization of architecture, spray-painted stone-like
A stucco-like finish with a solid feel is becoming popular as an exterior finish for large walls, mainly in concrete buildings, but it is rarely used in wooden buildings because it cannot be sprayed directly onto the lath base.

In recent years, instead of a lath base, a base plate having an adhesive layer with mortar on one surface is nailed to pillars, studs, etc., and mortar is painted over it. The so-called non-lath construction method has come to be used as a simplified construction method for foundation construction.

Although this construction method also has a stucco-like finish by spraying, the base plate used in this construction method.

It was originally developed as an alternative to lath base material so that mortar could be applied directly with a trowel.

If the unevenness of the adhesive layer painted or laminated on the surface is too thick, the water absorption is too low, or it is too sharp, it is not suitable as a base board for the sprayed stucco-like finishing method, and the board There are problems such as a poor finish such as visible seams, cracks, and the time it takes to inspect the groundwork.

[Means for Solving the Problems and Their Effects] The present invention has been made in view of the above points, and provides a method for constructing a stucco-like exterior wall on a building other than a concrete structure. That is, in the present invention, when constructing a stucco-like exterior wall, as a first step, a hydraulic composition made of hydraulic cement, synthetic resin or rubber, and aggregate is laminated on a waterproof base substrate, and a mesh is applied to the layer. A base plate having 2 to 20 substantially continuous grooves of 2 to 2 grooves or less in depth per 25.4 mm is fixed to structural members such as columns and studs with nails.

The second step is to apply or fill joint material to the joints of adjacent boards to form an exterior wall base.

As the third step, white portland cement is added to the substrate.
Undercoat by spraying an inorganic paint consisting of aggregate, inorganic powder, anti-crack material, and water to a thickness of 2 to 4 meters.

The fourth step is to level out the streak-like or band-like irregularities that occur on the seam of the board using a spatula or trowel.

As the fifth step, after the undercoat is semi-dry or dry and solidified, an inorganic paint consisting of white Portland cement, aggregate, inorganic powder, anti-crack material, and water is applied over the undercoat to an average thickness of 2 to 6 ffiI11. The sixth step is to press the protruding parts of the paint layer obtained by beading with a trowel or roller to perform a head-cut treatment.

Relating to a construction method for stucco-like exterior walls characterized by the combination of the above seven steps, in which as a seventh step, an alkali-resistant synthetic resin paint is applied over the head-cut uneven paint layer while it retains moisture. It is something.

The first step is to fix a base plate suitable for a stucco-like finish to the structural material to form an exterior wall structure. The base board constituting the base board may be plywood, particle board, fiber board, wood board such as wood wool cement board, wood chip cement board, inorganic board such as asbestos pulp cement board, lightweight cement board, calc board, slag board, or wood board. It is a composite board of board and inorganic board.

If these boards are not waterproof, they must be treated with synthetic resin, rubber, bitumen, etc. to make them waterproof.

Hydraulic compositions include hydraulic cements such as portland cement, silica cement, blast furnace cement, fly ash cement, high sulfate cement, and slag ceracola cement compositions, emulsions of synthetic resin or rubber, latex or solutions, and vermiculite. , inorganic lightweight aggregates such as perlite, inorganic aggregates such as sand and crushed stone, foamed plastic particles, organic aggregates such as rubber powder, etc., and they are laminated on a base substrate. The thickness of the stacked layers is 0.5-2
+m is preferable, and 2 to 20 substantially continuous grooves with a depth of 0.5 to 2 degrees are formed per 25.4 w in the layer.

The area of the groove portion is preferably 10 to 50 times the laminated surface.

The effect of the laminated hydraulic composition, together with the effect of the mesh-like grooves, allows the inorganic paint applied over it to strongly adhere to the base substrate, and at the same time improves the application process such as preventing the inorganic paint from sagging. It is a good thing. The grooves formed in this layer are adhesive for inorganic paint.

This is extremely important in terms of improving paintability, and the grooves are shallow,
If the number of grooves is too small, or conversely if the number of grooves is too large, the width of the grooves will become small as a result, and the effect of the grooves will not be exhibited, which is not preferable. The same applies to cases where the area of the groove portion is too small. If the thickness of the core layer is less than 0.5 mm, the water absorption will be reduced and at the same time the grooves will be too shallow, resulting in poor coating properties with inorganic paints. If the area of the groove portion is too large, it is also undesirable because adhesion with inorganic paint and paintability will deteriorate. If the thickness of the layer is thicker than 2 mm, a separate treatment will be required to make the seam of the board less noticeable, which is not preferable.

The base plate is fixed to structural members such as the studs of the first column, the body frame, the side braces, and the braces. Round nails and screw nails are generally used for fixing, but when staples are used or the structural material is lightweight steel, tapping screws are used.

The nails are galvanized, unichrome plated,
It is more preferable to use stainless steel.

The second step is to waterproof the joints of the boards, and the joint material used is synthetic resin, bitumen, or rubber. Waterproofing with joint material is also required around pillars, window frames, etc., but sheet-like material may be used in these areas. When the side edges of the base plate are hemmed, a V-shaped groove is formed between the base plate and the adjacent base plate, making it easy to treat with a joint material and providing excellent waterproof properties.

The third step is the step of undercoating an inorganic paint consisting of white Portland cement, aggregate, inorganic powder, and crack prevention material. The aggregate used in the paint is generally silica sand or akansui stone, but a small amount of lightweight aggregate such as perlite or expanded styrene may also be used in combination. Lime as an inorganic powder,
Dolomite plaster, calcium carbonate, silicic acid powder, etc., and anti-crack materials include glass fiber, fibers such as pulp, shrinkage reducing materials such as calcium aluminate, methylcellulose, polyvinyl alcohol, vinyl acetate,
Powders and emulsions of synthetic resins such as acrylic polymers are used.

The appropriate thickness of the undercoat is 2 to 4 gourds, and it is necessary to apply it so that there are not too many unevenness. What is important in this process is to irregularly reduce the irregularities on the surface. When painting by spraying, the fluidity of the paint must be increased in order to completely cover the base, but if the coating amount is increased and the coating thickness exceeds 4 m, the paint will sag, which is undesirable. Also, if you reduce the amount of coating to make it thinner than 2tas, there will be areas where the base is transparent due to the shadow of the aggregate, and unevenness and unevenness of the base will easily appear in the finish.
It becomes difficult to level the surface with a spatula or trowel, or
It is also unfavorable from the standpoint of waterproofness, fireproofing, and appearance.

The aggregate in the inorganic paint used in the undercoat has important effects such as workability of the undercoat, strength and bulk of the undercoat, and relaxation of shrinkage.

In order to make them effective, the particle size is preferably 0.15 to 1.5 mm, and the appropriate blending ratio is 0.5 to 1.2 times the apparent volume of white Portland cement and inorganic powder.

The fourth step is to level out and reduce the unevenness of the undercoat. When waterproofing is done by applying joint material to the joints of boards or filling them, it is common for the joint material to bulge out in the form of streaks or bands, or to become depressed due to fading. It is possible to reduce the dents caused by fading by applying or filling the joint material more often, but this is time-consuming.

In reality, it is only performed once or twice. Even if you apply an undercoat of inorganic paint to these streak-like or band-like uneven areas, these unevenness will actually hardly disappear. When pressed with a trowel or roller, the pattern formed on the surface can be distinguished from others.

The appearance of the joint treatment area becomes extremely poor, with noticeable streaks and bands. Further, when the streak-like depression is large, an inorganic paint may be sprayed around the depression in advance in the third step, but in this case, the joint treatment area becomes a band-like raised part.

The fourth step is a step to prevent this, and attempts to level out the unevenness with a spatula or trowel while the undercoat still has fluidity. The cause of the unevenness is due to uneven groundwork,
In the case of nailing, etc., it may be leveled as appropriate.

The fifth step is white Portland cement and aggregate.

By spraying an inorganic paint made of inorganic powder and anti-crack material to form a large uneven surface, it is possible to create a thickness that is desirable for performance as an outer wall.

This process gives a solid appearance. It is preferable from the point of view of performance and appearance that the average coating thickness of the ball spray is 2 to 6 trm, and the total average coating thickness with the undercoat is 4 to 10 trm, and the construction method is also one-time spraying in the vertical and horizontal directions. It's as simple as possible. If the average coating thickness is too low, defects in the base and undercoat will appear on the finished surface, resulting in poor appearance, lack of unevenness, and lack of depth, as well as impairing the solidity and fire resistance of the exterior wall. But I don't like it.

If you try to make the coating thickness thicker than 6 times with ball blowing.

Due to blurring issues, I had to paint it in several batches.

The cost is high, the pattern tends to be irregular, etc.
This is undesirable because it causes problems such as clutching becoming more likely to occur. If the difference in height of the unevenness in this step is 3 m or more, preferably 5 to 10 m, a good finish will be obtained by the head cutting process in the next step. The aggregate, inorganic powder, and crack prevention material used in the inorganic paint in this step are the materials used as the undercoat in the third step, but they do not need to be the same. The appropriate mixing ratio of aggregate is about 0.8 to 2 times the apparent volume of white Portland cement and inorganic powder.

In the sixth step, the protruding portions of the paint layer obtained in the fifth step are pressed down with a trowel or roller before being dried and solidified to perform a head cant treatment to flatten the heads of the protruding portions. The purpose is to flatten the head of the protrusion.

It has a better appearance, there are no sharp protrusions, so the paint won't come off, and it won't get damaged when touched by objects or objects. The shape of the convex portions after the head cutting process changes depending on the pressing method, but it is preferable that the pattern is irregular as a whole, but is balanced without any deviation. Therefore, it is desirable that the base material be as smooth as possible.

After undercoating, the surface has irregular unevenness and no lumps.If the unevenness like streaks is not made inconspicuous, the pattern obtained by this process will also be biased and the pattern will not be balanced. This will result in a poor appearance.

The seventh step is to prevent rapid drying of the inorganic paint layer by coating an alkali-resistant synthetic resin paint over it while the inorganic uneven paint layer obtained in the sixth step retains moisture. Deterrence of cracks.

The purpose is to increase water availability, prevent efflorescence, improve stain resistance, prevent water absorption from rainwater, etc. 1. Coloration. A suitable painting method is spraying. Alkali-resistant synthetic resin paints include acrylic acid, acrylic esters, and methacrylic acid.

Polymers and copolymers of methacrylic acid esters, styrenes, vinyl esters, vinyl ethers, vinyl chloride, vinylidene chloride, etc., copolymers with copolymerizable monomers such as ethylene, propylene, butadiene, and epoxy systems. It is a solution or emulsion paint of an alkali-resistant synthetic resin such as a chemical compound, a urethane compound, or an alkyd resin, and is mixed with a colorant, a filler, etc. as necessary.

〔Example] The exterior walls of a wooden framework building were constructed using the following procedure.

First step: The base plate is made by sequentially laminating an acrylic emulsicone waterproof paint layer and a hydraulic composition layer on a 6mm thick structural plywood board with hemmed side edges. N-50 nails were driven into the material at 10 cm intervals to form a wall structure. The hydraulic composition layer laminated on the base plate is made by coating and drying a composition having the following proportions, and the layer has mesh-like grooves with a depth of 1.0 to 1.5 mm. Five grooves are formed per 25.4 m, and the area of the groove is about 40 times the laminated surface.

Granulated blast furnace slag 320 parts by weight Two-water slag 80 parts by weight Ordinary Portland cement 100 parts by weight Pearlite C particle size 1.2
trrm or less) 100 parts by weight Styrene acrylic copolymer emulsion (solid content 57%) 100 parts by weight Dispersant and other additives 6.2 parts by weight Water
120 parts by weight 2nd process At the joint of the board, fill the V-shaped groove formed by the edge of the board with an acrylic joint material that has good adhesion to mortar, and press with a spatula so that it blends well with the board. I let it happen. After drying, the joint material showed fading, and the joint treated area was depressed in the form of streaks.

Third step: The inorganic paint prepared in the following ratio was uniformly sprayed using a gun with a diameter of 5 wm at a pressure of 5 to 6 kV/cat2 to a thickness of about 3+ m. The joint-treated areas that were depressed in the form of lines due to the curling remained depressed in the form of lines even after the above-mentioned spraying.

White Portland cement 15 parts by weight Inorganic powder (dolomite plaster, lime) 9 parts by weight Crack preventive agent (glass fiber, powdered synthetic resin) 1 part by weight Aggregate (anusuistone, particle size 0.9 mm) 30 parts by weight Water
12 parts by weight Fourth step While the sprayed inorganic paint layer had fluidity, the streak-like dents found at the seams of the board were smoothed out with a spatula.

There was some unevenness on the board other than the seams, but it did not have any negative impact on the beading in the next process.

Step 5: After the undercoating paint no longer flows due to coagulation and drying 1
3.5 to 5 k'i/cm using a gun with a diameter of 10
In step 2, spray the inorganic paint mixed in the following proportions.

It has an uneven surface with protrusions of various sizes. The average coating thickness in this step of one-time spraying was approximately 4 m+n, the difference in height of the unevenness was 5 to 7 III, and the coating was completed without sagging.

White Portland cement 15 parts by weight Inorganic powder (dromed plaster, lime) 9 parts by weight Crack inhibitor (glass fiber, powdered synthetic resin) 1
Parts by Weight: Aggregate (1 particle size of Kansui Stone, 0.9 m): 45 parts by weight: Water 13 parts by weight Sixth Step: The protruding parts were lightly pressed down with a roller to make them flat, taking into account the watering down of the sprayed paint. The cross section of the paint layer was trapezoidal, and the height including the undercoat was 8 to 9 gourds. The flat part has an irregular shape, with a mixture of large and small objects without any particular uneven distribution.

It was well-balanced. Therefore, the edges of the board, where the pattern tends to be uneven, were not noticeable.

Seventh Step While the paint layer pressed down with a roll in the sixth step retained moisture, an acrylic emulsion paint toned to a pale beige color was sprayed so as to spread even into the recesses.

The exterior wall constructed through the above process has cracks.

There was no efflorescence, and the exterior walls had the solid feel that is characteristic of stucco-like finishes. In addition, a test specimen was separately prepared using the same procedure, and after curing for one month, a plane tensile strength test was conducted according to JISA6909, and the 1 strength was 5.
．． It was 4 kV/wet 2.

〔effect〕

According to the present invention, it becomes possible to easily apply a stucco-like finish using an inorganic paint to the outer walls of buildings with frame and frame structures. Also.

Not only is the foundation work simplified, but the finished exterior wall has a well-balanced pattern with no noticeable joints between the boards, giving it a solid, solid feel with a single stone look, and is also waterproof, solid, and durable. , and has excellent fire resistance.

Claims (1)

[Claims] When constructing a stucco-like exterior wall, as a first step, a hydraulic composition consisting of hydraulic cement, synthetic resin or rubber, and aggregate is laminated on a waterproof base substrate, and the layer is Fixing a base plate having 2 to 20 substantially continuous grooves of 0.5 to 2 mm in depth per 25.4 mm to structural members such as posts and studs with nails; The second step is to apply or fill joint material between adjacent boards to form an exterior wall base, and the third step is to apply white portland cement to the base.
Apply an inorganic paint consisting of aggregate, inorganic powder, anti-crack material, and water, and apply an undercoat by spraying to a thickness of 2 to 4 mm.The fourth step is to remove the streaks or bands that appear on the seams of the board. In the fifth step, after the undercoat is semi-dry or dry, apply a layer of white Portland cement, aggregate, inorganic powder, anti-crack material, and water over the undercoat. The inorganic paint is sprayed in an uneven pattern so that the average thickness of the coating is 2 to 6 mm.The sixth step is to press the protruding parts of the paint layer obtained by beading with a trowel or roller to perform a head cut treatment. The seventh step is to apply an alkali-resistant synthetic resin paint over the head-cut uneven paint layer while it still retains water. Construction method.