This document discusses various materials and methods used for damp proofing in construction. It describes that a damp proof course (DPC) is used to prevent moisture from passing into interior spaces. Common materials used include polythene sheets, EPDM membranes, mortar with waterproofing compounds, and occasionally expensive metal sheets. Polythene sheets are typically laid with 150mm overlaps and sealed at the joints when used under concrete. EPDM has properties that make it suitable such as flexibility and chemical resistance. Metal sheets can be used but are costly and must be coated to prevent chemical reactions. The document provides information on properly installing and applying these various damp proofing materials and methods.

1. DPC IN FOUNDATION
SOURCES:
ULTRATECH CEMENT WIKIPEDIA RUSSETTS
Damp proofing or a Damp-Proof in construction is a type of
moisture control applied to building walls and floors to prevent
moisture from passing into the interior spaces. Surface on
which dpc to be installed should be thoroughly clean and wetted.
Polythene. -proof membrane with
d lapped 150 mm at joints and continued across
the thickness of the wall.
EPDM
EPDM stands for Ethylene Proplyene Diene Monomer
Characteristics of EPDM damp proof course membrane lend itself
perfectly to the job:
• Exceptional contraction and expansion characteristics with up to
400% elongation
• Temperature stable from -40°C to +120°C
• Excellent chemical resistance
• Will not discolour masonry
• Life expectancy of over 40 years
• Contains no environmental pollutants
Polythene or polyethylene sheet is commonly used as a damp-proof membrane with oversite concrete for all but severe
conditions of dampness.
Installation:-
When used under concrete oversite the sheet should be laid on a blinding layer of sand or compacted fuel ash spread
over the hardcore.The sheets are spread over the blinding an d lapped 150 mm at joints and continued across
surrounding walls, under the dpc for the thickness of the wall.Where site conditions are reasonably dry and clean, the
overlap joints between the sheets are sealed with mastic or mastic tape between the overlapping sheets and the joint
completed with a polythene jointing tape.
Mortar with Waterproofing Compounds
Concrete of thickness (min 25mm) (ratio 1:1.5:3) with suitable water
proofing compound (recommended shall be mixed). After hardening
of concrete layer a thin layer of sealant dry which is a cement paste
waterproofing compound has to be applied in 2 coats perpendicular
to each other with group of 4hrs betweem the cords
MATERIALS
INTRO
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2
1
Butyl Rubber Hot Bitumen Mastic asphaltPolythene sheet Impervious Brick
Metal Sheets
Metal sheets of Copper, Aluminium, or Lead are used to prevent
dampness, but they are costly.Sheets of these materials are used
throughout the thickness of the wall.The sheets of Lead are laid over
Lime Mortar and not with Cement.Mortar due to the chemical reaction
of Cement over the Lead.The sheets of metal should be coated with
asphalt.The thickness of the sheets should not be less than 3mm.
ANAND KASAUDHAN
SUBMITTED BY:
ANURAG MAHAJAN
MOHIT GUPTA
SAHIL VERMA
YASH SRIVASTAV
Department of Architecture and Planning