1. Waterproofing grade standards for underground engineering (level 4) Level 1: No water seepage is allowed, no wet stains on the structural surface (no wet stains on the structural surface (no wet stains) Level 2: No water leakage is allowed, and there may be a small amount of w

2025/03/1521:41:34 home 1114

1. Waterproofing grade standard for underground engineering ( level 4 )

first-class : no water seepage is allowed, no wet stains on the structural surface ( not seepage, no wet )

second-class : no water leakage is allowed, there may be a small amount of wet stains on the structural surface; ( not leak, less wet )

second-class : no water leakage is allowed, there may be a small amount of wet stains on the structural surface; ( not leak, less wet ) 0 Underground Project of Building Building : The total wet stain area should not be greater than 1/1000 of the total waterproof area (including roof panels, walls, and ground); the wet stains on any 100m² waterproof area shall not exceed 2, and the maximum area of a single wet stain shall not be greater than 0.1m²;

Other underground projects : The total wet rupture area should not be greater than 2/1000 of the total waterproof area, the wet stains on any 100m² waterproof area shall not exceed 3, and the maximum area of a single wet stain shall not be greater than 0.2m²; among which the average water seepage of tunnel projects shall not be greater than 0.05L/( m² · d ), the water seepage of any 100m² waterproof area shall not exceed 0.15L/( m² . d ).

Level 3: A small number of leaking points, no wire flow or mud leakage; ( fewer leaking points, no linear flow or mud leakage )

Any 100m² waterproof area does not exceed 7 places, the maximum leakage of a single leak point shall not exceed 2.5L/d, and the maximum area of a single wet stain shall not exceed 0.3m².

Level 4 : If there are water leakage points, no wire flow or mud leakage; ( has leakage points, no linear flow or mud leakage )

The average water leakage of the entire project shall not be greater than 2L/( m² · d ); the average water leakage of any 100m² waterproof area shall not be greater than 4L/( m² · d )

2. Roof waterproof grade ( two-level ) and fortification requirements

important buildings and high-rise buildings, waterproof grade is I, two waterproof fortifications;

general buildings , waterproof grade is Ⅱ, and one waterproof fortification is .

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