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Table 8 - contd.
Drainage
(1) The subsoil of the site of the room shall be effectually drained wherever the
dampness of the site renders this necessary.
(2) No subsoil drain shall discharge into a soil drain except through a suitable
trap.
(3) Every drain passing through the room, and every drain or sewer passing under
the room other than a subsoil drain shall be gastight and watertight.
Floors
(4) The floor of the room shall be of such material or materials and construction 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.
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
effectually drained, and the paved surface shall be at least six
inches below the level of the bottom of the sill of the window.
Nothing in this regulation shall prohibit the placing in or over such open
space of any steps necessary for access to any part of the building in which
the room is contained provided they are not placed over or across any window
satisfying the requirements of the preceding regulations.
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