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Podium level building

A podium building has concrete lower levels (carpark or retail) carrying lightweight apartments above. The podium deck is the critical waterproofing zone.

By Dan Waring. Last updated 11 June 2026. Verified 11 June 2026.

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A podium level building is a multi-storey building where the lower one or two levels are concrete structure (typically carparking, plant room, or retail), and lighter-framed apartment levels sit on top. The concrete podium carries the building above and forms a hard fire separation between the two parts.

Why it is common for Class 2

NCC 2022 Volume One Specification 5 (S5C23) permits a Class 2 or 3 building to have timber-framed upper storeys where the lowest storey is concrete or masonry used solely for vehicle parking. The separating floor must also be concrete or masonry, achieve the prescribed fire-resistance levels, and any opening through it must be protected by a self-closing fire door. A concrete podium plus timber apartments above is therefore a standard and cost-effective mid-rise configuration (verified 2026-06-11).

The podium deck: the builder’s risk zone

The top slab of the podium, called the podium deck, acts as a roof to the carpark below and a trafficable surface above (gardens, pools, recreation areas). That double duty demands a Cat III membrane rated under AS 4654.1, minimum falls of 1 in 60, design and installation to AS 4654.2, and where planters sit on the deck, a root barrier and drainage cell over the membrane (verified 2026-06-11).

Waterproofing is consistently the largest defect category in NSW Building Commissioner audits of Class 2 apartment buildings. Podium deck failures are among the most expensive to fix: access requires stripping landscaping and paving from above, and finishes from below (verified 2026-06-11).

Also known as: Podium construction, podium deck building.

Category: Building types / Class 2.

See also

References

Last updated: 2026-06-11. Verified: 2026-06-11. Quarterly review for currency.

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