It is good to make back glue to prevent the disease from occurring in the stone, but it is not good when we make the stone back glue too deified.
Some adhesive-backed stone companies advertise that it has high adhesive strength and can be directly mounted on the wall, misleading many construction units to omit the process of hanging copper wires when installing the back-adhesive stone. It is frequently heard that some construction sites are installed well. Accidents of falling stone occurred, and even the entire wall of stone falling accidents.
Some of these accidents have occurred in well-known domestic projects, which is a terrible thing. This kind of thing happens a lot. Someone once asked me whether the stone with adhesive backing can be installed without copper wire?
My answer is no. When installing the glued stone, the relevant construction specifications must be followed. The process of hanging the copper wire cannot be omitted, otherwise the installed stone may fall.
The reasons are as follows:
1. Stress occurs between the stones affected by thermal expansion
After the stone is heated or expanded, tensile stress will be generated. Under the action of tensile stress, the mutual extrusion of the stone will cause the stone to produce a great strength, which will cause the stone to break and fall.
2. The surface of the glued stone is too smooth to affect the adhesion between the glue and the stone surface
The surface smoothness of the adhesive stone has a great influence on the adhesive force between the adhesive and the stone. The smoother the surface, the weaker the adhesive force between the adhesive and the stone; on the contrary, the stronger. However, the large stone slabs are mostly cut with a see-saw. The surface is smooth and the roughness is not large, which has a great influence on the coagulation force of the adhesive.
This link is difficult to control when making adhesives. It is the vacuum zone of adhesives. When making adhesives, it is difficult for any stone enterprise to ensure that the adhesive force between the adhesive net, the adhesive and the stone meets the specification requirements.
3. The drawing strength of the sample plate meets the requirements of the specification, which does not mean that the adhesive product will not fall after installation.
Because the pull-out strength test uses small samples for testing, and the number of tests is limited, it represents only a small number of samples to test the samples and their local stress effects, which does not have universal significance. Qualified sample drawing test does not mean that the drawing strength of large products and all products of the entire project meets the requirements of the specification, and does not mean that it is foolproof. This is only a small probability event and cannot be comprehensive.
4. Influence of stone material
Adhesives of any brand are suitable for one or several materials and cannot be suitable for all stones. There are carbonate-based materials, silicate-based materials and materials of unknown composition in the stone, and some stone has many cracks, which affect the strength of the adhesive and the adhesive force of the adhesive to a certain extent.
5. I haven't seen the construction specification about the direct bonding of the stone made of adhesive
I have never seen any specifications that the stone products that have been glued can be directly installed on the wall without the use of slotted copper wire. This is mostly the marketing propaganda of current adhesive production enterprises saying that "products that have been adhesive can be directly applied to the wall for construction."
It has always been a norm that wet pasted wall stone products must be installed with copper wires. This is naturally a scientific reason. It is a violation of the construction norms to cancel at will.
Beijing’s local standard "Technical Regulations for the Application of Stones in Building Decoration Engineering" has clear standards for wet pasting stone on walls:
6. The influence of gravity will inevitably lead to the shedding of stone and adhesive
The stone installed on the wall always has a downward force to pull it under the influence of gravity. Without any suspension force, the lower the product is, the greater the gravity. Under the action of gravity, the stone installed on the wall always has to Falling down.
The general ceramic tile and stone construction facade is supported by the ground. The first (ie the bottom) stone stands on the ground, and the second one stands on the foundation of the first stone. If there is a copper wire or other hangings to pull between each stone and the wall, the stone can be firmly fixed on the wall with a slight horizontal pulling force.
After the stone is given a pulling force in the horizontal direction, it can greatly reduce the effect of gravity and reduce the possibility of the stone falling. Stone is heavier than ceramic tiles, with a gravity of 490 Newtons per square meter. The tiles that are attached to the wall without reinforcement will fall off (the phenomenon is more common), not to mention the stone.
The stone products that have been glued are installed on the wall. If only rely on the thin glue to stick, the stone products on the wall will fall off only a matter of time! The heavier the board has a shorter time to fall off.
7. The hollowing of stone construction is inevitable, once the hollowing stone will fall
The hollowing of stone construction is closely related to the technical level and sense of responsibility of the construction personnel. The hollowing rate of the stone installed by the construction personnel with high technical level and sense of responsibility is low or there is almost no hollowing, as for those construction personnel with low technical level and sense of responsibility. The installed stone has a high hollowing rate. Once the stone is empty, the stone will fall. If there is a copper wire pulling, it can ensure that the hollow stone will not fall, and safety is guaranteed.
8. Where there is water in the bathroom for a long time, the penetration of water affects the strength of the adhesive
Water will have a certain destructive effect on the stone, it will gradually infiltrate the stone from the joints and the surface of the stone into the inside of the stone and the bottom of the glue. Over time, water will more or less affect the adhesive, and even soften and corrode the adhesive layer, reducing the strength between the adhesive and the wall.
Adhesive wall stone installation suggestions:
(1) If the stone products that have been back glued are to be directly applied to the wall, the back glue can be polished to 50*50 size points at the back glue place. These points
Use high-strength dry hanging glue to bond, which will help the glue and the stone to separate in the future!
(2) It is understood that the stone products that have been back glued are best installed with the adhesive produced by the manufacturer of the corresponding back glue brand to ensure the compatibility of the back glue and the adhesive.
(3) Appropriate reinforcement measures. In the case that there is no corresponding construction specification that the adhesive-backed stone products can be directly applied to the wall, it is best to place them in places where they are easy to fall off, such as the bottom of the wall, the outside corner, the window, and long-term contact. The water area should be properly reinforced and reinforced with traditional construction techniques.
(4) 1～2mm thermal expansion and contraction expansion joints are left between adjacent plates to eliminate the expansion and contraction stress caused by temperature and water vapor changes.
(5) Strictly construct in accordance with the relevant construction specifications of the stone. The copper wire does not save labor. Even the best adhesive should be constructed strictly in accordance with the specifications.
In summary, if the glued stone is installed directly on the wall, it is still necessary to comply with the relevant construction specifications for stone installation, and to work strictly in accordance with the construction specifications. The copper wire should also be connected to the copper wire. Multiple safety measures are not a bad thing. After all, the construction project is a century-old project, and it is justified to ensure that it is foolproof in its use.
If you violate the relevant construction specifications for stone building decoration, it will be a matter of time for the installed stone to fall. Don't have a fluke mentality and game psychology. Wait until a life-threatening accident occurs and you will regret it too late!
