Does the Prefabricated Slab House Have Water Leakage? Video Translation

Prefabricated slab houses do indeed have water leakage issues. The causes of water leakage and repair suggestions are as follows:

High-incidence Areas of Water Leakage and Their Causes

1. Water Leakage at Joints
   The joints of prefabricated assembled houses are the main source of water leakage. For example, water leakage on the east wall of the balcony is often caused by water seepage through the joints. Especially when the sealing materials of the joints age or there are construction defects, rainwater can easily penetrate into the interior through the gaps.

2. Roof Water Leakage

   • Joint Treatment Defects: If the joints of the prefabricated slab roof are not properly treated (such as not reserving expansion joints or the filling materials aging), they are prone to cracking under the action of earthquakes or thermal expansion and contraction, leading to rainwater infiltration.
   • Weak Waterproof Layer: Poor construction quality or improper selection of waterproof materials can cause the waterproof layer to fail prematurely. Especially after long-term exposure to ultraviolet rays and rainwater erosion, the risk of leakage increases significantly.
   • Material Aging: The materials of the prefabricated slab roof (such as concrete) age quickly, with a service life of about 10 years. After aging, cracks increase, exacerbating the leakage problem.

3. Water Seepage during Floor Leveling
   When leveling the floor of a prefabricated slab house, if the original cracks are not repaired or the mortar layer is not well-bonded, rainwater may seep through the cracks into the downstairs or walls, causing problems such as dampness and mold.

Repair Suggestions

1. Avoid Surface Repairs: Simply applying waterproof coatings or filling gaps on the leaking surface cannot address the structural defects at the root. It is necessary to deal with the source of the leakage.

2. Roof Repair Solutions

   • Color Steel Roof Covering: The cost is about 60 - 80 yuan/㎡. It is suitable for cases where the roof is severely aged. It can completely isolate rainwater, but attention should be paid to the firmness of installation.
   • Waterproof Membrane Repair: The service life is about 15 years, depending on the construction quality. It is necessary to select weather-resistant materials (such as SBS modified asphalt membranes) and ensure that the joints are tightly sealed.
   • Plastic Film Covering: The cost is only 2 yuan/㎡, but the effect only lasts for 2 - 3 years. It is suitable for temporary emergencies or situations with a limited budget.

3. Joint Treatment: It is necessary to clean the original sealing materials, refill with weather-resistant sealants (such as silicone sealants), and apply waterproof coatings to enhance protection.

Extended Suggestions

If you want to watch specific cases or construction demonstrations, you can search for keywords such as 'Actual Records of Water Leakage Repair in Prefabricated Slab Houses' or 'Video on Waterproof Treatment of Joints in Prefabricated Slabs' to obtain more intuitive operational guidance.