Waterproofing of Prefabricated Concrete Houses

Waterproofing of prefabricated concrete houses requires comprehensive treatment from three aspects: material selection, construction techniques, and post-construction maintenance. The specific methods are as follows:

I. Material Selection and Damp-Proof Design

1. Application of Damp-Proof Materials

   • Damp-proof prefabricated concrete houses enhance cement density and reduce porosity by adding damp-proof agents (such as silicates), blocking moisture penetration at the material level.
   • Waterproof cement and polymer-modified mortar enhance water resistance through chemical modification, forming a physical barrier; damp-proof membranes (such as polyethylene films) can be laid inside foundations or walls to further isolate moisture.
   • Indoor floors adopt damp-proof cushions (such as extruded polystyrene boards) or elevated designs to reduce ground humidity through air circulation.

2. Selection of Waterproof Coatings

   • Prioritize materials with high durability, water resistance, and corrosion resistance, such as organosilicon waterproofing agents and cement mortar waterproofing agents.
   • Before application, clean the substrate to ensure it is clean, dry, and free of oil stains. Cracks or defects should be repaired and leveled to ensure strong adhesion between the coating and the substrate.

II. Key Points in Construction Techniques

1. Foundation and Drainage Treatment

   • The foundation should be higher than the surrounding ground and equipped with drainage ditches or waterproof layers (such as asphalt rolls) to prevent groundwater from rising and causing dampness in the house.
   • Use dedicated sealing materials (such as silicone sealants) to fill joints between prefabricated components, preventing moisture from infiltrating through gaps.

2. Slope and Drainage Design

   • When installing walls and roofs, design a reasonable slope (usually a roof slope of ≥5%) to ensure rapid water runoff and reduce the risk of water accumulation.
   • Regularly clean the roof drainage system (such as gutters and downspouts) to prevent blockages that could lead to water leakage.

3. Waterproof Layer Construction Specifications

   • When preparing cement waterproofing materials, mix cement, sand, water, and other raw materials strictly according to proportions and stir thoroughly until uniform and free of particles.
   • Apply the waterproof layer in layers, with each layer having an appropriate thickness (usually 1-2mm) to ensure no omissions; strengthen treatment at details such as wall corners and pipe roots (such as adding glass fiber cloth).

III. Post-Construction Maintenance and Management

1. Regular Inspection and Repair

   • It is recommended to conduct a comprehensive inspection of the house annually, focusing on observing whether the coatings on walls, floors, and roofs are intact and free of cracks or peeling.
   • Promptly repair local damage with compatible materials (such as the same type of waterproof coating or sealant) to prevent problems from expanding.

2. Ventilation and Humidity Control

   • Maintaining indoor ventilation is key to damp prevention and can be achieved by installing exhaust fans or regularly opening windows for air circulation.
   • Use dehumidifiers to assist in humidity control during humid seasons, and it is recommended to maintain indoor relative humidity at 50%-60%.

3. Avoid External Force Damage

   • Prevent sharp objects from scratching the waterproof layer and avoid stacking heavy objects or randomly drilling holes on the roof to reduce the risk of human-induced damage.