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51
Si te
4. The site of the room shall be covered with such material or
materials as adequately to resist the passage of moisture or exhalation
from the ground.
Walls
5. The walls of the room shall either be of such material and
construction, or shall have been so treated., as adequately to resist the
passage of moisture to their inner surface, or to any timber or other
material forming part of the building that would be harmfully affected by
dampness. Provided that where the ground or earth is in contact with the
wall of a room above the level of the floor, 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 6" above the surface of such ground or earth.
Ventilation and Lighting
6. The room shall have a window or windows as specified in paragraph
(i) of this regulation for the purposes of ventilation, and in
paragraph (ii) for the purposes of lighting.
(i) One or more windows which can be opened at the top directly into
the external air to an extent equivalent in aggregate area to not less
than one-twentieth of the area of the floor of the room.
(ii) One or more windows having an aggregate area clear of the window
frame amounting to not less than one-tenth of the area of the floor of the
room, and so situated that from any point thereon, or, if the total window
area exceeds the foregoing minimum requirement, from any point on a part
or parts thereof which satisfy that requirement, a line can be drawn
upwards at an angle of thirty degrees with the horizontal in a vertical
plane at right angles to the plane of the window without intercepting any
obstruction except an open fence within a distance of ten feet measured
horizontally from the window. for this purpose a bay window with side
lights shall be deemed to be a flat window equal in area to the sum of the
areas of the front and side lights, situated at a distance from the face
of the wall from which it projects equal to half the maximum depth of the
projection.
7. Immediately outside any window provided in pursuance of these
regulations there shall be an unobstructed space which shall conform with
the following requirements -
(i) The space shall extend throughout the entire width of the
window and (except where the area of such window is not
less than one-seventh of the area of the floor of the room)
for two feet on each side of the window.
(ii) The space shall in every part extend for not less than two
feet from the external wall of the room except that, where
the window is a bay window with side lights, the depth of
the space in front of that window may be reduced to not
less than one foot.
(iii) If the space is below the general level of the ground
within nine feet from the window so much of it as satisfies
the foregoing requirements of this regulation shall be
properly paved with impervious material and effectually
drained, and the paved surface shall be at least six inches
below the level of the bottom of the sill of the window.