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2. Every drain passing under the room, other than a
drain for the drainage of the subsoil of the site of the room,
shall be properly constructed and capable of standing the
smoke or coloured water test or other similar tests (not
including a test by water under pressure.)
3. The room shall be effectually protected against the
rising of any effluvium or exhalation by means of a layer of
asphalte or of good concrete at least six inches thick, or
four inches thick if properly grouted, laid upon the ground
of the site of the entire room, or in some equally effectual
manner; any such concrete shall be composed of at least
one part of good Portland cement thoroughly incorporated
with six parts of stone ballast or other suitable material.
4. The space, if any, beneath the floor of the room shall
be provided with adequate means of through ventilation.
5. (i) Every wall of the room shall be provided with a
proper horizontal damp-proof course which, if the floor of
the room be formed of woodwork, shall be beneath the level
of the lowest timbers or woodwork of such floor, and in every
other case shall be not less than one inch below the level of
the upper surface of such floor.
(ii.) No part of any wall of the room shall, where
it is practicable to avoid it, be in contact with the ground or
earth.
Provided that where any wall of the room is in contact
with the ground or earth, such wall or such part thereof as
is so in contact shall, unless constructed as a hollow wall,
have an efficient vertical damp-proof course extending from
the base thereof to a height of at least six inches above the
surface of such ground or earth. A damp-proof course for
the purposes of these regulations shall consist of sheet lead,
asphalte, vitrified stoneware, or a double layer of slates laid