What are the signs of a slippery crack in the foundation of a residential roof?

Causes of cracks in houses: temperature cracks, latex paint cracks, structural cracks, cement stucco layer cracks, putty layer cracks.

1. Temperature cracks.

For the masonry structure, the floor and the masonry are mutually constrained, and in the case of constraints, if the external temperature changes, the temperature deformation between the floor and the masonry is not coordinated, and the masonry will produce temperature stress. There is a limit value of tensile and shear strength in masonry itself, and when the temperature stress exceeds this limit, temperature cracks will occur in masonry.

2. Cracks in latex paint.

If there are cracks on the surface of the paint film, you can use fine sandpaper to polish the cracks off, and then repaint them with latex paint.

3. Structural cracks.

Expansion joints between structural walls and brick walls extend to the surface of the wall, and these cracks can also manifest as cracks formed by latex paint. If this kind of crack occurs, you should find a professional building structure personnel to take corresponding measures according to the actual situation.

4. Cracks in the cement stucco layer.

This kind of cracking is often the ratio of cement and yellow sand when the wall should be powdered, many hydraulic enterprises reduce the amount of cement, and the result is the cracking of the cement mortar stucco layer, and lead to the cracking of the latex paint.

5. Cracking of the putty layer.

This crack is the slightest crack and is often caused by the putty layer being too thick or too thin.

Extended Information: Treatment of Cracks:

1. Thermal cracks in the house, this crack usually does not affect the structure of the house, this crack mainly affects the aesthetics of the appearance of the house, then we can use some repair measures, you can use non-woven fabric to paste on the crack, PVC mesh cloth pasted on it or plug the crack with mortar, and then use paint to repair it.

2. The settlement cracks in the house, the occurrence of such cracks is relatively slow, it takes a certain amount of time, and the repair time of this crack must be carried out after the crack is stable. Usually the settlement of the foundation of a new house will be stabilized within 2-5 years. If the crack has little impact on the overall aesthetics of the house, it can be repaired after the first repair.

The repair is generally filled with cement mortar, polymer mortar or elastic putty and gypsum, and the caulking tape is pasted.

3. Structural cracks in the house - ordinary decoration methods cannot be repaired, and professional building structure personnel must be found to take corresponding measures according to the actual situation.

4. Latex paint cracks on the surface of the house Wallpaper cracks: If it is only a crack in the surface paint film, use fine sandpaper to polish the cracks off and repaint them. If the wallpaper is cracked at the joint, moisten it with warm water and re-apply the wallpaper glue to paste.

5. Cracks in the house putty leveling layer: If the cracks have penetrated deep into the putty layer, you can first use a sharp tool to expand the cracks to a cone size, fill in the caulking plaster and polish and level, paste the grid cloth or kraft paper and then use putty for leveling, and then paint or paste wallpaper according to the normal process.

A fractured structure that may cause the house to collapse and the rock to break apart after being stressed and not displaced along the fracture surface. It includes rock joints, which are often synonymous with joints. According to its cause, it can be divided into two categories: primary and secondary fissures.

The former is formed during diagenesis, while the latter is formed by external forces after rock formation. According to the ** of force, it is divided into two types of fractures: non-structural and tectonic. The former is formed by external geological processes, such as weathering, landslides, collapses and other fractures, which are often confined to the surface and are small in scale and irregularly distributed.

The latter, formed by tectonic action, is extremely widely and regularly distributed, extends long and deep, and can cut through different rock formations. Fractures have a great impact on engineering construction, especially on the stability of tunnels and underground projects. [2]

Genesis. Fractures can be divided into weathering fractures, diagenetic fractures and tectonic fractures according to their genesis, and the nature and development law of fractures are closely related to the genesis of fractures.

Diagenetic fissures. Diagenetic fissures are the primary structures of rocks produced by internal stress in the process of diagenesis, and diagenetic fissures are produced by the consolidation and dehydration of sedimentary rocks and the condensation and contraction of magmatic rocks, while the diagenetic fissures of sedimentary rocks and plutonic magmatic rocks are mostly closed, and the water content is of little significance.

Weathering fissures. Weathering fractures are formed under the action of temperature changes and weathering forces such as water, air and organisms, and are often further developed on the basis of diagenetic and tectonic fractures, forming a dense and uniform fracture network with no obvious directionality and good connectivity. The weathering force determines that the weathering fissures are shell-like and wrapped on the surface, with a general thickness of several meters to tens of meters, and the unweathered parent rock constitutes a waterproof floor, which is generally a submersible water-bearing system, and can be confined water locally.

Tectonic fissures. Tectonic fractures are the most common, the most widely distributed, and the most closely related to various hydrological and engineering geological problems among all the fracture genesis types, and are the main objects of fracture water research. Tectonic fracture water has strong inhomogeneity, anisotropy, randomness, etc.

The opening width, extension length, density and water conductivity of tectonic fractures are largely affected by rock properties (such as lithology, thickness of single layers, combination of adjacent rocks, etc.). [3]

Research implications. When a large number of underground caverns, mines, slopes and related projects are excavated, supported and other activities, the joints will expand and evolve, reducing the stability of the surrounding rock. In order to effectively limit the gradual failure of fractured rock mass, it is necessary to study the three-dimensional crack propagation mechanism of multi-fractured rock mass, establish corresponding analysis methods, and apply the results to the stability evaluation of large-scale rock mass projects such as underground caverns and slopes, which not only has outstanding theoretical significance, but also has great practical value and social benefits.

On the one hand.

In this case, the owner of the completed building, which has no cracks at the beginning and is generally qualified in appearance, cannot ascertain its authenticity, but after a year or two, the building will produce large-scale uneven settlement, and when the foundation of the house produces serious uneven settlement and the position of the reinforcement is wrong or the number is insufficient, cracks also begin to appear, from bottom to top, slowly, it will get bigger and bigger. Not only that, when the crack is at a 45-degree angle to the corner of the wall, there are vertical through cracks on the beams, and there are also vertical cracks at the root of the balcony and awning, such a whole will become a dangerous house, and there is no safety guarantee.

Another reason is the formation of cracks formed by improper treatment of small local cracks. Cracks can also form if individual very small areas of construction work are not properly treated. The crack is in the shape of an inverted figure-eight.

The inverted figure-of-eight small seam has no obvious effect on the structure, but it will correspondingly weaken the seismic performance, and local reinforcement should also be carried out.

In addition to the above-mentioned cracks that have an impact on safety, there are also some cracks that have no impact on safety, that is, the cracks that are allowed to exist as mentioned above. The causes and manifestations of these cracks are as follows:

1. Cracks in the decorative surface.

The causes of cracks in decorative surfaces (such as putty) are also temperature differences and natural erosion. The form is mostly cracked (the crack is shaped like a pattern on the back of a turtle and is named), which has no impact on safety and is easy to repair.

2. Cracks formed due to material differences.

In construction, cracks in the junction of frame structural columns and block walls are caused by material differences. This crack is usually around the corner, vertically upwards. Again, such cracks are inevitable and do not compromise safety.

3. "One" shaped cracks caused by local material shrinkage.

For example, when a wall shrinks after drying, the frame creates cracks because the gravity of the wall itself drops, creating a zigzag crack parallel to the floor.

4. Cracks formed due to different temperature differences and physical properties.

Among the wall materials, the reinforced concrete structure is more sensitive to the temperature difference and the deformation is relatively large, while the wall dominated by bricks and blocks is relatively sluggish and the deformation is small. After exposure to the sun in summer or the severe cold in winter, some slight displacements will occur between the floor and the wall, and cracks will occur due to uneven force. This type of crack is generally concentrated in the room at the end of the building, close to the exterior wall.

This type of crack is generally in the shape of a figure-eight, that is, starting from the middle of the top of the wall, diagonally downward, and extending to the corner of the end of the building. For the cracks formed due to the temperature difference and the different physical properties of the material, there is no good way to do so, although it affects the aesthetics, but has no impact on the structural safety.

The doors and windows are out of shape, the floor tiles are hollow, and there is an echo in the house, which are all signs of the sinking theme of the house.

There are two types of cracks that cause a house to collapse, as follows:

One is structural cracks. Structural cracks can be further divided into two types: one is brittle failure and the other is plastic failure.

Brittle failure usually occurs suddenly, and there is a greater risk of house collapse. Plastic failure has obvious deformation and crack brightening before the occurrence, although its danger is less than brittle failure, but it will still cause the house to collapse, there is a certain danger. Structural cracks are generally caused by subsidence of the foundation.

It is necessary to prevent the foundation from sinking and avoid the collapse of the house through effective management.

Another case of pure lap width is the crack of the beam body. Beam cracks generally refer to cracks in concrete beams. To determine whether the crack in the beam will cause the collapse of the house, it is necessary to determine the number of cracks in the beam.

If the crack in the beam is small, there is a certain hidden danger, but it is not enough to cause the house to collapse. However, if the crack of the cool body is greater than millimeter, it is easy to build branches and potatoes into the collapse of the house, and there is a great hidden danger.

Residents must pay attention to inspect the cracks in the house to avoid causing ** damage.

1. Normal cracks.

If the wall crack corresponds to the interior wall and extends to the plug-in box and other places, it is mostly because the string duct is chiseled on the wall to place the wires, and then the crack occurs after filling the cement and drying. If the wall crack extends for a long time, and the wall and the ground are connected together, it is mostly the expansion joint of the floor slab left by the large tower when it is poured in stages, which is a normal structural crack.

2. Temperature cracks.

Temperature cracks are the most common cracks in houses and have little impact on the structural safety of houses. Wall cracks like this based on ambient temperature only affect the interior appearance of the house, and will not affect the safety of the house. For example, sticking non-woven fabrics, pasting PVC mesh cloth or plugging joints with mortar, leveling with putty powder, and then using paint to repair them.

3. The seam is cracked.

This type of crack is also a tricky type of crack, usually occurring at the joints between the old and new walls. For example, the wall of the construction hole that must be reserved for building development is usually built backwards, and if it cannot be naturally connected with the original wall, it will also produce cracks. This kind of crack is recommended to be repaired after the deformation of the whole building tends to be stable, and the repair within a short period of time is prone to recurrence.

4. Settlement cracks.

The second kind to say is the crack caused by the uneven settlement of the foundation, after the house is built, the foundation will generally sink, if the foundation settlement is uneven, the relative displacement of the large settlement settlement and the small settlement of the part occurs, and the shear force and tensile force are generated in the wall, and when this additional internal force exceeds the tensile and shear strength of the wall itself, cracks will be generated.

1. What is the standard for identifying cracks in houses?

From the housing quality inspection standards issued by the Ministry of Construction, if the wall crack is generally not more than 1 mm, it can be said that the quality is qualified, and if it exceeds 1 mm, it means that it is an unqualified house, and the identification standard of house cracks is not up to standard.

If there are countless irregular cracks on the entire wall or there are regular stool cracks, the quality can be judged to be problematic, and the stability of the general crack continues to increase is two years, and the oblique crack belongs to the uneven force of the wall. As for the width of the crack in the house, the maximum width should be 1 mm.

After the housing safety appraisal, you can get the risk identification level of the house, so how is the standard of the housing safety appraisal divided?

Class A: The structural bearing capacity can meet the requirements of normal use, no dangerous points are found, and the structure of the house is safe.

Grade B: The bearing capacity of the structure can basically meet the requirements of normal use, and individual structural components are in a dangerous state, but do not affect the main structure, and basically meet the requirements of normal use.

Class C: The bearing capacity of some load-bearing structures cannot meet the requirements of normal use, and local dangers occur, constituting local dangerous houses.

Grade D: The bearing capacity of the load-bearing structure can no longer meet the requirements of normal use, and the whole house is in danger, constituting the whole dangerous house.

Summary. Hello, kiss <>

If the ground of a residential building is cracked, it is necessary to find out the cause in time, determine the responsible party, and take corresponding measures to deal with it in accordance with the provisions of the Property Law and the Contract Law. If it is caused by a defect in the quality of the building, the owner can request the developer or construction unit to repair or replace it. If it is caused by foundation problems, you can apply to the relevant environmental protection, land, construction or planning departments for inspection, and require the relevant responsible parties to repair or compensate in accordance with relevant legal procedures!!

How to deal with cracks in the ground of residential houses.

Hello, kiss <>

If the ground of a residential building is cracked, it is necessary to find out the cause in time, determine the responsible party, and take corresponding measures to deal with it in accordance with the provisions of the Property Law and the Contract Law. If it is caused by a problem with the quality of the building, the owner can request the developer or construction unit to repair or replace it. If it is caused by foundation problems, you can apply to the relevant environmental protection sheds, soil stuffiness and land registration, construction or planning departments for inspection, and in accordance with the relevant legal procedures to require the relevant responsible parties to repair or compensate!!

According to Chapter VII, Tier 113 of the Property Law, if the owner of a house has defects in the CCB building and the foundation, public infrastructure, common parts and other properties attached to the structure, it has the right to require the relevant unit or person to bear legal responsibility for repair, compensation, etc!!

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In addition, you need to pay attention to the fact that the cracking of the residential ground is generally related to the settlement of the foundation, soil quality and other factors, and the owner should pay attention to check the housing quality certificate and other information when buying the house, and reasonably evaluate the construction quality of the house to avoid subsequent disputes. At the same time, when buying a house, a strict contract should be signed to clarify the responsibilities of all parties and the relationship between them.

If a problem is found, the owner should negotiate with the developer or construction unit of Mingkong as soon as possible, and if the negotiation fails, he can complain or sue to the relevant administrative departments, courts and other relevant institutions!!

<> kiss, is there anything else you don't understand? Tell me more about your situation and I'll answer for you. <>