There can be many causes and locations of basement water seepage, and here are some common ones:
The bottom plate is damp in a large area, with no obvious cracks and no obvious water seepage. This may be due to quality issues with commercial concrete, such as concrete strength and impermeability grades that do not meet design requirements.
The location of the construction joints (cold joints) of the basement floor, exterior wall, and roof. This is usually caused by improper handling of construction joints.
Severe local water seepage. This may be due to local vibration is not compact, leakage vibration, concrete structure is loose and not compact, etc.
The joints on both sides of the post-pouring belt are cracked and seeped. This may be due to the fact that the garbage, loose concrete, and stagnant water are not cleaned up before pouring the post-pouring belt, the concrete water-cement ratio is too large, the expansion compensation is not enough, or the installation of the water-stop strip for water expansion is incorrect, or it falls during construction.
Cracking and water seepage at the horizontal joint between the basement floor and the exterior wall. This may be due to the uneven pouring of concrete at the horizontal joints of the exterior wall, the waterproof steel plate does not work, and even the position of the waterproof steel plate is reversed.
Water seepage at the junction between the water supply and drainage pipes and strong electric pipes in and out of the basement and the wall. This may be due to the fact that the water supply and drainage pipes entering and exiting the basement are not installed with waterproof casing, or the concrete around the casing is not compact, or the pipe and the conduit are not tightly blocked according to the requirements of relevant specifications.
Water seepage at the location of the water-stopping screw on the outer wall of the basement. This may be due to the fact that the weld is not tight when the outer wall water-stopping screw iron ring piece is welded with the screw, or the water-stopping screw is loosened prematurely by demoulding.
In addition, there are other reasons that can also cause water seepage in the basement, such as water seepage at the root of the wall, water seepage from deformation joints, water seepage through the pipes through the exterior wall, water leakage where the water is scattered on the exterior wall, and water leakage on individual walls.
For the treatment of basement water seepage, it is necessary to take corresponding plugging measures according to the specific cause and location, such as raising the basement waterproof layer, using waterproof coatings, replacing pipes and pipes, filling foundation cracks, etc. At the same time, in the basement design and construction stage, waterproofing measures also need to be fully considered to prevent water seepage problems.