Scg 25335(S) · OPW16/0105

Where the stiffening beams intersect a perimeter footing, their base must be graded down to the footing base
level, 3 x N12 bars must be cogged into the footing and lapped 500 with the beams trench mesh. Refer to the
structural plans for details.

Where the stiffening beams intersect a blockbase or retaining wall, 3-N12 bars must be dowelled 150mm into
the blockbase and lapped 500 with the beams trench mesh. Refer to the structural plans for details.

A levelling layer under the ground floor slab is to comprise of granular material such as clean sand or crusher
dust 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 and must continue
under any thickenings or stiffening beams.

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.

Drilled Piers Supporting the Slab

Slab piers are required where there is more than 300mm of uncontrolled fill beneath the slab. They are to be
founded at a minimum of 300mm into the NATURAL MEDIUM DENSE SILTY SANDS. Special attention must be
paid to the extra slab thickening required over slab piers as detailed in the structural plans.

Where unexcavatable rock is encountered at depths shallower the founding level the piers shall be augered a
minimum of 100mm into un-weathered or un-disturbed rock.

Where drilled piers supporting columns or posts are not poured with the slab they must be connected to the
slab in the following manner:

   • 4-N12 bars must be anchored 500mm into the drilled pier and be bent 300mm horizontally into the
     footing or slab as required.

   • Where a column penetrates a beam or footing 3-N12 bars must be bent around the column to lap the
     trench mesh by 500mm both sides.

Drilled Pier Reinforcement

                               Pier Depth mm    Perimeter Piers       Slab Piers

                                up to 1500       None required      none required
                                1500-2500         2xN12bars         none required
                                2500-4000         4xN12bars          2xN12bars
                                4000-6000         6xN12 bars         4xN12bars


NOTE: The information contained herein has been compiled following our field and laboratory testing,
      accepted engineering theory and discussions with and information supplied by our client,
      whom is noted on the header page of this report. We offer no warranty for the use of this report
      by other parties without prior written consent from this office.
        The report must be read in conjunction with the attached appendices. If you do not have a
        copy of these please contact our office and a copy can be issued to you.




for and on behalf
SCG CONSULTING ENGINEERS




    SCG Consulting Engineers                            4                                    SCG Ref: 25335(S)