DPC AND WATER PROOFING

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1) D.P.C. (Damp proof course)

  • A damp proof course ( DPC ) is a physical barrier inserted into the fabric of a building to stop water passing from one place to another.
  • It is of two types: Horizontal, Vertical
DPC

2) Function of DPC

  • Keeping moisture from entering through the foundations
  • Blocking moisture passage at exterior walls
FUNCTION OF DPC
  • A horizontal DPC is usually placed 6 inches above ground level and used in conjunction with a damp proof membrane which stops water rising to any part of the ground floor from the ground.
FUNCTION OF DPC ONE
  • In many older properties a non porous stone allow water to be soaked up through it. It is not practical in most cases, to remove a course of stone to place a plastic, lead or slate DPC in the wall they require the injection of chemicals into the walls
FUNCTION OF DPC TWO

3) Application

  • Moisture in wet ground is very likely to soak up into the walls from the foundation, thus causing the building to be very unhealthy and producing rot in the woodwork.
  • To prevent the moisture from rising through the foundation walls, a horizontal damp-proof course should be placed in all walls .
APPLICATION OF DPC
APPLICATION OF DPC ONE
  • In many cases, when buildings are finished with parapet walls, it is customary to put in a damp-proof course just above the flashing of the roof or gutter, in order that the dampness produced by driving rains may not soak down into the woodwork of the roof, and from there to the walls below.
APPLICATION OF DPC TWO
APPLICATION OF DPC FOUR

4) Materials

  • Acrylic Modified Cement
  • Bituminous
  1. Asphalt
  2. Coal tar pitch
MATERIALS OF DPC

5) Protecting damp proofing

  • Thin sandwich of asphalt saturated felts, polythene film and modified asphalt with mineral filler. Metal oxide water Proofing receives a mortar or concrete protective course.
PROTECTING DAMP PROOFING

7) Surface preparation

  • Should be smooth, hard, dry.
  • Free of bond breaking substances.
  • Oil free concrete or masonry surfaces.
  • Free from holes, projections, severe cracking.
SURFACE PREPARATION FOR DPC

8) Laying and installation

  • Cover full thickness of wall
  • Base should be clear even and free from projections.
  • Side shuttering should be strong
  • Concrete surface should be prepared
  • Desired material should be laid
LAYING AND INSTALLATION OF DPC

9) Water proofing

  • Waterproofing products are designed to “prevent” water penetration even under wet conditions such as hydrostatic pressure in the soil after heavy rain storms or spring thaws.
WATER PROOFING
  • Aquaseal’s products contain rubber which provides superior waterproofing protection and allows the product to remain flexible even when it dries. This flexibility allows the waterproofing membrane to stretch as the foundation settles and bridge small hairline settlement cracks that can occur in the concrete or block
WATER PROOFING ONE

10) Types of water proofing

  • Positive face
  • Negative face
TYPES OF WATER PROOFING

11) Materials

  • Acrylic modified cement
  • Metal oxide
  • Bituminous – Asphalt, Coal tar pitch
  • Lead
  • bentonite – Panels Sheets
MATERIALS FOR WATER PROOFING

11) Difference DPC and waterproofing

  • Damp proofing is tar based, while water proofing is rubber based.
  • Damp proofing slows the process of water absorption.
  • Water proofing prevents the process of water absorption.
  • Water proofing is friendlier when it comes to environmental concerns.
  • Water proofing is initially more expensive.
  • Damp proofing is cheaper in the beginning, but leads to more expensive problems later on.
  • Damp proofing cracks along with the foundation, while water proofing stretches to cover those cracks.
  • Water proofing prevents hydrostatic pressure from ruining a foundation

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