Who is responsible for the cracks in the wall?

1. Find a property to solve the problem: If there is a crack in the wall of the new house, then at this time, you need to find a property to inspect the house first, judge according to the size and nature of the crack, and then consult the developer for a solution.

2, find a developer to solve: cracks in the new house can be solved by the developer. The shelf life of a new house is generally two years. Therefore, as long as it is not caused by human factors, the developer should be found to solve the cracks in the wall of the housing foundation for no more than two years. If you haven't checked in, you can ask them to change rooms. If you can't change rooms, you can ask them to repair and compensate for the losses. If you can't live in a dangerous house because of serious cracking, you can ask them to return a house or pay compensation.

How to Repair Wall Cracks

The economical and simple method is to adopt the surface sealing method for the diagonal cracks at the four corners of each floor and the cracks caused by uneven settlement of the foundation, that is, to cut a U-shaped or V-shaped groove with a chainsaw or chisel, and then clean the surface and seal it with high-grade cement mortar.

1. In order to improve the sealing density and water resistance, epoxy structural adhesive is a good choice. Using epoxy resin as sealant can help to restore the tensile strength of cracks, effectively prevent harmful chemicals such as water vapor and carbon dioxide from entering, and the surface smoothness is also satisfactory.

2. Check the uneven settlement of foundation every year. That is, check whether there are radial oblique cracks around the foundation, whether the transverse cracks are enlarged or new cracks appear, take measures to deal with them in time if any abnormality is found, and at the same time do a good job in drainage measures around the house to prevent rainwater from directly infiltrating into the foundation downstairs.

3. For the transverse through cracks on the roof slab, the pressure grouting method can be adopted, and chemical grouting materials (such as polyurethane, epoxy resin or cement liquid) are injected into the depth of the cracks through the pressure grouting equipment to restore the integrity, waterproofness and durability of the structure.

What are the causes of wall cracking?

1, chemical shrinkage, also known as hydration shrinkage. Cement hydration will produce hydration heat, which will increase the volume of solid phase, but decrease the volume of cement-water system. Cement materials have this shrinkage reduction effect after hydration. The volume reduction of most silicate cement pastes after complete hydration is 7%-9%. Before hardening, the solid volume increased by the hydration of plastering mortar fills the space originally occupied by water, making the cement paste compact and the macro volume reduced. The macro volume of hardened plastering mortar remains unchanged, while the shrinkage of cement-water system forms many capillary cracks, which affects the performance of plastering mortar.

2. Dry shrinkage refers to the irreversible shrinkage of plastering mortar after it stops curing and loses the water absorbed by internal capillary holes and gel holes in unsaturated air.

3. Self-shrinkage means that after the initial setting of plastering mortar, the cement continues to hydrate, and in the absence of external water supplement, the macro volume of plastering mortar decreases due to negative pressure generated by self-drying. Self-contraction starts from initial setting and mainly occurs in the early stage.

4. The temperature shrinkage of plastering mortar is also called cold shrinkage, which is caused by the increase of hydration temperature of cement inside plastering mortar and then cooling to ambient temperature. The size of temperature shrinkage is related to thermal expansion coefficient, internal high temperature of plastering mortar and cooling rate.