07/0616 - Response to Information Request [As Published] · 132007.616

Floor Slab Details:

We recommend reinforcing the ground floor slab as shown with SL82 slab fabric and the thickenings as
specified.

Where the foundation level of these thickenings is below prepared pad level, it may be advantageous to
excavate them at the same time as the perimeter footing.

Where the beams intersect the perimeter footing or blockbase, their base must be graded down to the
footing base level, 3 x N12 bars must be cogged into the footing, extended up the core filled wall and
lapped 500 with the beams trench mesh. Refer to the attached details.

A levelling layer under the floor slab is to comprise of granular material compacted in 150mm layers.
Either well graded sand or crusher dust can be used.

An approved polyethylene damp proof membrane of 0.2mm (min.) thickness is to be placed over the
levelling layer. Laps are to be a minimum of 200mm and be taped. All service penetrations and punctures
are to be fully taped. The membrane is to be extended down the inside face of the perimeter footings.

Where rock is encountered within the slab area and encroaches within the slab depth it should be
excavated to a level which enables placement of a 100mm (min.) layer of granular material under the
slab.

Notes:
All building dimensions are to be obtained from the approved plans. The builder must ensure that the final
pier placement meets all the requirements of this report (both written specifications and cross-sections).

Ail excavations must be totally free of all loose material and debris before pouring. They must be cleaned
out so that the concrete is poured onto undisturbed ground. Tamping and/or watering loose material is
not acceptable.

We strongly recommend footing excavations be inspected by a qualified person with appropriate
experience to confirm the founding material and level is as nominated herein.

Similarly all preparations should be inspected prior to the pouring of concrete by a qualified
person with appropriate experience to confirm that the workmanship and construction conforms
with the details and recommendations contained herein.

Tiled Areas:

In areas where ceramic floor tiles or brittle coverings alike are required we recommend increasing the
size of the slab mesh by one grade. Use flexible adhesives when affixing tiles and delay the laying for as
long as possible (at least 3 months, preferably 6 months) after the slab is poured.

Reinforcement:
Reinforcement is to comply with the following :

a) Concrete cover around the reinforcement must be 40mm to unprotected ground, 40mm to external
exposure, 30mm to the membrane in contact with the ground, and 20mm to the internal surface. The
slab_fabric_ shall be placed towards the top of the slab within the zone defined by these limits. We
recommend 30mm top cover.

b) Slab fabric must be lapped by one full panel of fabric so that the two outermost transverse wires of one
sheet overlap two outermost transverse wires of the sheet being lapped. Slab fabric is to be supported on
bar chairs placed at 800mm ctrs.

¢) Trench mesh must have all cross wires cut flush with the outer main wires. Trench mesh in slab and

edge beams must be overlapped by the width of the fabric at “T” & “L” intersections. Trench mesh must
be spliced, where necessary, by a lap of 500mm.

SCG CONSULTING ENGINEERS 4 SCG Ref: 17177(S)