Water Leakage in Prefabricated Panel Houses

Water leakage in prefabricated panel houses requires targeted treatment based on specific causes. Common causes include seal failure at panel joints, aging of waterproof layers, and structural settlement, among others. The responsibility for repairs must be determined in conjunction with the house's condition and the cause of the leakage.

I. Common Causes of Water Leakage

1. Seal Failure at Panel Joints Prefabricated panel houses are constructed by joining multiple concrete panels together, with the panel joints filled using sealants or waterproof materials. If the sealing materials age, crack, or are not filled tightly during construction, rainwater can easily penetrate indoors through the panel joints. For example, in old residential buildings constructed between 1990 and 2010, such problems have erupted on a large scale, leading to water seepage marks on walls or ceilings.

2. Aging or Damage to Waterproof Layers The waterproof layers on roofs or walls (such as asphalt rolls or waterproof coatings) are gradually aged and cracked due to long-term exposure to ultraviolet rays and temperature variations. If there are defects in the waterproof layer during construction (such as insufficient thickness or poor overlapping), or if it is later damaged by external forces (such as drilling or trampling), water leakage can also occur.

3. Structural Settlement or Deformation Uneven settlement of the house's foundation can cause cracks between the prefabricated panels, damaging the original waterproofing system. Additionally, after long-term use, the prefabricated panels themselves may develop small cracks due to concrete shrinkage or load changes, becoming channels for water leakage.

4. Improper Assembly and Joining If the prefabricated panels are not joined properly during construction (such as not reserving expansion joints or not cleaning the panel joints thoroughly), or if the waterproofing treatment does not meet standards (such as not applying waterproof coatings or not installing water stops), later environmental changes (such as temperature fluctuations or humidity variations) can cause water leakage through the panel joints.

II. Determination of Repair Responsibility

1. House in Disrepair Due to Age If the house has been in use for many years (such as over 20 years) and the water leakage is caused by natural wear and tear, such as aging of the waterproof layer or failure of the sealant, the house owner is usually responsible for the repair costs.

2. Assembly and Joining Problems If the water leakage is caused by improper joining by the construction party (such as unsealed panel joints or inadequate waterproof layer construction) and the house is still within the warranty period (usually 5 years), the construction party can be requested to carry out free repairs. If the warranty period has expired, but it can be proven that the water leakage is directly related to the construction quality, legal action can still be taken to pursue responsibility.

3. Structural Settlement Problems If the water leakage is caused by foundation settlement, a professional organization must first be commissioned to detect the cause of the settlement. If it is caused by design defects or construction quality issues, the original construction unit or developer can be requested to bear the repair responsibility. If it is caused by natural geological changes, the house owner must handle it themselves.