Summary Letter_Quamby Place · 51901.3604.03

    4.   Steel beam FB2 will need to be introduced on the eastern side of the wall to pick up the two new floor
         beams FB3.
    5.   The existing external brickwork wall will not be structurally adequate to support the new steel beam FB2
         that pickups the altered floor load of 20kN point load. Also, the existing lintel over the sliding door
         (galvanised angle section) will not be structurally adequate to support the steel beam.
             • A series of 89SHS columns will need to be introduced to pick up the steel beam FB2 as shown on
                  the sketch.
             • This steel beam will need to be cantilevered to avoid the column in the middle of the sliding
                  door.
    6.   These edge steel columns can be supported by the 170 thick level 2 slab.
    7.   The existing working load capacity of the strip footing is approximately 60kN/m. The alteration of the
         penthouse will add extra load of 12.5kN/m to the strip footing. The total working load will be 62.5kN/m
         on the strip footing. This will be just over the capacity. However, ground slab is 250mm thick and the
         load comes down through the external wall will get distributed to the slab and the strip footing.
         Therefore, the strip footing should be able to handle the additional load.




                                           Figure 1: Indicative Framing Plan

Based upon our high-level review, the existing building structural elements will not be able to support the
proposed alteration work without any strengthening or introduction of new structural steel columns. As listed
down in the summary, with the introduction of the steel columns the alteration of the pent house floor will be
feasible.

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