Approved Document Part C - Site Preparation and Resistance to
Moisture
C1. Preparation of Site
Vegetation and topsoil must be removed from a site before
building can start.
C2. Dangerous And Offensive Substances
Increasingly these days, buildings are constructed on sites
which may have been contaminated or have been waste tips or
similar. Sometimes substances and materials found in these areas
are harmful or cause a health risk. They have to be identified,
removed or treated to make them harmless. Precautions must be taken
to avoid the ingress and accumulation of harmful gasses such as
Radon and Methane.
C3. Subsoil Drainage
Very often ground water exists naturally just below the surface
of the ground. If left it would get into the building making it
unhealthy and possibly damage the building itself. To avoid this it
is sometimes necessary to provide special drains to take the water
away.
C4. Resistance To Weather And Ground Moisture
The walls, floors and of course the roof of a building must be
designed and constructed so as to be adequately
waterproof.
Archived Copies
Approved Document C - 1992 edition
Valid: 1st June 1992 - 1st December 2004
The requirement in this edition was:
C1 - Preparation of Site
C2 - Dangerous and Offensive Substances
C3 - Subsoil Drainage
C4 - Resistance to weather and ground moisture
Approved Document C - 1985 edition
Valid: 11th November 1985 - 1st June 1992
The requirement in this edition was:
C1/2/3 - Site preparation and contaminants
C4 - Resistance to weather and ground moisture
