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The solution for underground garage waterproofing membrane mainly includes the following key steps and technical measures:

1. Selection of waterproofing membrane: Choosing the appropriate waterproofing membrane is the key to ensuring the waterproofing effect. Commonly used waterproofing membranes include SBS modified asphalt waterproofing membranes, polyurethane waterproofing membranes, etc. These materials have good waterproof performance and durability, and can effectively prevent moisture infiltration.

2. Preparation before construction: Before construction, it is necessary to clean and inspect the garage roof to ensure that the construction area is dry and clean, and accurately locate the leakage points and water lines. At the same time, according to the specific situation and waterproof requirements of the garage roof, suitable waterproof materials such as asphalt waterproof materials, polyurethane waterproof coatings, rubber waterproof coatings, and waterproof rolls should be selected.

3. Construction steps: During construction, the top plate should be repaired and leveled as necessary to ensure that the base layer is solid, free of cracks, sanding, and other phenomena. Then, paint or lay according to the requirements of the selected waterproof material. For example, when using polyurethane waterproof coating, it is necessary to first apply the primer, and then apply the topcoat after it has dried completely to ensure that each layer is evenly applied without any omissions. For the use of waterproofing membranes, it is necessary to clean the base layer and apply special adhesive, then lay and compact the membrane to ensure a tight fit with the base layer. Finally, cover the entire top panel with waterproof coating to enhance the waterproof effect.

4. Waterproof layer protection: After the waterproof layer construction is completed, timely protection work should be done. A layer of fine aggregate concrete can be laid as a protective layer to improve the durability and resistance to damage of the waterproof layer.

5. Technical details and precautions: In the process of plugging, the principle of combining rigidity and flexibility should be followed, that is, flexible grouting materials should be used internally for plugging, and rigid materials should be used externally for reinforcement. At the same time, it is necessary to strictly control the grouting pressure to avoid excessive pressure causing the waterproof layer to rupture or the grouting material to overflow. For the internal and external corners, pipe roots and other detailed nodes on the top plate, special attention should be paid to waterproof treatment. These areas are often high-risk areas for water leakage and require reinforcement layers or special materials for treatment.

6. Post construction maintenance and inspection: After construction is completed, regular inspections and maintenance are required to ensure the continuous effectiveness of the waterproof layer. This includes regular inspections and maintenance, quality testing, and compliance with relevant regulations and standards during the construction process to ensure safe and civilized construction.

Through the above steps and measures, the waterproof performance of the underground garage can be effectively improved, ensuring the safe use of the garage.