What are the different methods for exterior wall waterproofing?

2025-07-21


There are four mainstream methods for exterior wall waterproofing: coating waterproofing

  There are four main methods for exterior wall waterproofing: coating waterproofing, membrane waterproofing, concrete waterproofing, and brick-cladding waterproofing. The specific choice depends on the building structure, material properties, and construction conditions.
  Coating Waterproofing
  Material Selection: Commonly used flexible coatings include polyurethane and acrylic, which are convenient and cost-effective to apply, but require regular maintenance.
  Construction Steps:
  Clean the wall surface, removing oil stains and loose layers;
  Apply 2-3 coats of coating, allowing each coat to dry completely;
  Check the coating for completeness to avoid omissions.
  Membrane Waterproofing
  Material Types: Modified bitumen membrane or PVC membrane, strong waterproofing performance but higher construction difficulty.
  Key Processes:
  The wall surface must be dry and flat, and the membrane should be laid from bottom to top;
  The overlapping width should be ≥100mm horizontally and ≥80mm vertically;
  Seams must be sealed.
  Concrete Waterproofing
  Core Measures: Add polymer cement waterproofing agent or sodium silicate to the concrete to improve impermeability.
  Construction Points:
  The waterproofing agent must be evenly mixed into the concrete;
  Strengthen curing after pouring to prevent cracking.

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