Dampproofing of Prefabricated Modular Housing
Dampproofing of prefabricated modular housing can be achieved through technical means such as base isolation, structural ventilation, surface treatment, elevated dampproof layers, regional adaptability improvements, construction quality control, and regular maintenance.
1. Base Isolation Technology
Lay high-polymer waterproof membranes at the contact layer between the foundation and the wall to form a physical barrier layer, effectively preventing the rise of underground capillary water. This technology reduces moisture intrusion from the source by blocking the moisture migration path, making it particularly suitable for areas with high groundwater levels or high soil moisture.
2. Structural Ventilation Design
Micro-pore channels are set inside the wall to expel moisture using the principle of air convection. This design maintains indoor humidity within a comfortable range of 55%-65% for extended periods, preventing mold growth or material corrosion caused by excessive humidity. The pore size of the micro-pore channels must be precisely controlled to balance ventilation and waterproofing.
3. Surface Treatment Process
The interior wall is plastered with silicate-based waterproof mortar, whose crystalline structure expands upon contact with water to automatically fill pores, achieving a “self-healing” function; the exterior wall is coated with a hydrophobic layer, causing rainwater to bead and roll off, reducing moisture penetration. These two processes enhance dampproofing performance from the perspectives of internal repair and external protection, respectively.
4. Elevated Dampproof Layer with Prefabricated Panels
A cavity of 30-50 centimeters is left between the foundation and the first-floor ground surface, allowing underground moisture to rise into the cavity and dissipate naturally without reaching the indoor ground surface. During construction, the ground beam is poured, and then the backfill soil is compacted to a certain height before placing the prefabricated panels. Reinforcing steel mesh and concrete layers can be added to enhance structural stability.
5. Regional Adaptability Improvements
For rainy and cold regions, the thickness of the foundation insulation layer needs to be increased, and composite materials should be used to enhance dampproofing and insulation performance; the roof should be designed as a double-slope drainage structure to prevent rainwater backflow; the ventilation system should combine ground air ducts with roof fans to achieve dual control of humidity and temperature. For example, in extremely cold regions, increasing the thickness of the insulation layer can reduce thermal bridge effects and lower the risk of condensation.
6. Construction Process and Quality Control
Dampproofing construction must strictly follow procedures such as site surveying, foundation construction, wall installation, and joint treatment, and verify system effectiveness through radon detection and infrared thermal imaging scanning. For example, joints should be reinforced with sealant or waterproof membranes to prevent them from becoming weak points for moisture penetration.
7. Maintenance Points
Regularly checking the integrity of the exterior wall coating, clearing blockages from ventilation openings, and keeping drainage ditches clear are key to maintaining long-term dampproofing performance. For example, if the hydrophobic coating peels off, it should be repaired promptly; otherwise, it will reduce the rainwater diversion effect.
