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105
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.
6. Unless the room is provided with a fireplace and a flue properly constructed
and properly connected with such fireplace, it shall be provided with
special and adequate means of ventilation by one or more suitably placed
apertures or air shafts.
7. An area or open space properly paved with impervious material and
effectually drained by means of a properly trapped gully shall adjoin the
room and extend either throughout the entire length of one side thereof or at
least throughout the entire width of any window or windows required by
these regulations and (except where the area of such windows shall be of not
less extent than one-seventh of the floor area of the room) for three feet on
both sides of such window or windows.
Such area or open space shall be not less than two feet wide in every part
thereof and shall be open upwards from a level three inches below the level of
the damp-proof course in the adjoining wall of the room.
Provided (a) that where a bay window in the room having side lights
overlooks such area the width thereof in front of such window may be one
foot at the least and (b) that any steps necessary for access to any part of the
building comprising the room may be placed in or over such area if they are
so placed as not to be over or across any window of the room required by the
regulation in that behalf.
8. (i) The room shall be effectually lighted by means of one or more
windows opening directly into the external air.
(ii) Every such window shall be so constructed that one-half at the least
may be opened and that the opening may extend to the top of the
window.
(iii) The total area of such window or windows clear of the sash frames
shall be equal at the least to one-eighth of the floor area of the
room, and a portion of such total area equal in extent to at least
one-tenth of such floor area shall be so situated that a line making
an angle of 30 degrees with a horizontal plane can be drawn
upwards from any point thereon in a vertical plane at right
angles to the plane of the window so as not to intersect within a
distance of ten feet measured horizontally from the window of any
wall of any area adjoining the room or any other wall or any kerb
or other obstruction except an open fence. For the purposes of
this paragraph a bay window having side lights shall be assumed
to be equivalent to a flat window of the same area and of the same
height in relation to the room and situated at a distance from the
outside area wall equal to the mean width of the area.