Which of the following waterproofing methods is often used for external surfaces of concrete structures? 

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. Root barriers
  2. Cavity wall construction
  3. Membrane waterproofing
  4. Integral waterproofing

Answer (Detailed Solution Below)

Option 3 : Membrane waterproofing
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Explanation:

Membrane waterproofing

  • Involves applying a waterproof material (e.g., bitumen, PVC, EPDM) to external concrete surfaces.

  • Creates a barrier to prevent water infiltration.

  • Commonly used for roofs, basements, and foundations of concrete structures.

Additional Information Root barriers

  • Used to prevent plant roots from penetrating concrete structures.

  • Commonly used in landscaping, especially for green roofs.

  • Not a waterproofing method but can protect concrete from root damage.

Cavity wall construction

  • Involves creating a gap (cavity) between two walls for insulation and moisture control.

  • Helps reduce dampness but not a direct waterproofing solution.

  • Primarily used in wall construction, not specifically for external surfaces of concrete structures.

Integral waterproofing

  • Involves adding waterproofing chemicals to the concrete mix itself.

  • Reduces water permeability within the concrete.

  • Suitable for internal use, not specifically for external surfaces of concrete structures.

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