— SS—SS— SB
LIVERPOOL SHEDS. 389
to it, lie rows of rolled joists, 6 by 3 inches by 16 Ibs., spaced 26 inches
centre to centre, forming a core for a body of concrete 8 inches in depth,
which covers the top of the joists by 2 inches. The surface coating is of
crushed granite passed through a sieve of 16 rneshes, and retained by a
sieve of 64 rneshes, to the square inch, mixed with an equal quantity of
cement. For the bulk of the concrete, 6 parts of broken brick and gravel
to 1 of cement are employed. The ironwork throughout is of mild steel.
Three-storey sheds are now being constructed on identical lines.
Fig. 372 is a cross-section of a single-storey shed of a less permanent
and more economical type. The sides and end walls are of timber framing,
covered with l|-inch Norway planking. The main uprights are of pitch-
Fig. 372. —Shed at Liverpool.
pine, 12 inches square, 13 feet apart, with intermediates 12 by 6 inches,
all having their bases bedded in concrete. The division walls alone
are of brickwork, and this with the design of curtailing the ravages of
a possible fire. The roof has combined timber and iron trusses, covered
with boarding whereon is laid Graves’ Patent Roofing No. 2, the laps and
joints of which are coated with mastic before being nailed to the boarding.