Moisture Protection – Level for providing a damp-proof course (DPC) in buildings In ordinary residential and public buildings, at which level is the horizontal damp-proof course typically provided along external and internal walls?

Introduction / Context:
The damp-proof course (DPC) is a barrier that prevents capillary rise of moisture into walls. Correct placement is essential to protect finishes and interior health conditions, especially in masonry construction.

Given Data / Assumptions:

• Typical residential/public building on ground.
• Horizontal DPC is a continuous layer in walls.
• Objective is to stop upward moisture wicking.

Concept / Approach:
Capillary rise originates from the ground and migrates up through porous masonry. Placing the DPC at plinth level—just above finished ground level and over the plinth beam or base—interrupts this path, keeping occupied areas and finishes dry.

Step-by-Step Solution:
Identify moisture source: soil moisture rising by capillarity.Place barrier where it prevents entry into habitable wall zones: plinth level.Ensure continuity under thresholds and through internal partitions.

Verification / Alternative check:
Standard details show DPC at plinth with compatible vertical DPCs at vulnerable junctions and adequate site drainage to reduce hydrostatic pressure.

Why Other Options Are Wrong:

• Ground level: too low; splashback and bridging risks remain.
• Water table or mid-depth: impractical and unnecessary; DPC works by breaking capillarity, not by matching groundwater depth.
• Roof level: unrelated to rising damp control.

Common Pitfalls:
Allowing bridges over the DPC via plaster or debris; ensure proper overlaps and compatible materials with concrete/brickwork.

Final Answer:
At plinth level (above finished ground)