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7.2.5 Floors
Concrete floors are to be poured on ground level with minor adjustment for slope and level. Compacted sand fill and with a layer of moisture barrier building film to eliminate
water movement should be used. Elevated floors of more than 400mm above ground level are proposed as slab on
compacted fill as shown in Drg 10 and 11. It would be normal procedure to cast the supporting sub wall on a footing and compact fill inside that wall. Floor waste drains
and pipes are then cut into the fill and compacted in packing sand to allow some movement and avoid leakage into sub floor slab material.
This procedure depends on local techniques of placing slabs and building walls on top of slab compared with placing walls and pouring slabs inside the wall line. This
remains a detail design consideration requiring regional civil engineering advice. Concrete floors need to accommodate drainage falls usually set at 1:100 minimum on
the flat plain slope toward a drainage point refer drg. 15. It is normal practice to work all levels from a common floor crest point level at
doorways and the bottom edge of walls for the entire building, and adjust levels of drain outlets in each area to provide the fall necessary from that crest to the finished
drain height. Height is then adjusted in the drain pipework. Floor material is normally 35 MPa concrete with a steel trowel finish then broomed to
an appropriate non skid surface. In high wear areas such as adjacent to dressing cradles, tile or stainless steel wear plates may provide a replaceable area that copes
with high traffic and dropped tools. All product handling trolleys on the floor must be fitted with rubber compound type tyres to avoid floor damage.
Fixed cradles will also assist in reducing the risk of floor damage. All hoists must be adjusted to avoid chain hook contact with the floor at lowest point.
Floor toppings are an option. Epoxy or similar sandresin flooring materials provide satisfactory performance, however, they require maintenance and are expensive to
install and replace. Heavy acid resistant textured floor tiles and epoxy grout are attractive but expensive. Cheap, low quality floor tiles are an inappropriate short term
solution and should be avoided. Concrete in cattle yards and races should be 40 MPa and patterned to avoid slippage
but allow drainage and cleaning refer separate notes on yards.
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7.2.6 Roofing
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