Slab pre-pour inspection in Truganina

Stage2 of 7

When to bookSteel tied, pods down, plumbing in, and the pour still a day or two away

Time on siteAbout 1 hour on site

Inspected againstAS 2870, AS 3600, NCC Part 3.2, the engineer's slab design and the soil report

What is included in a Truganina slab pre-pour inspection

Edge and internal beam widths with a tape
Loadbearing stems at the engineer's minimum
Corner L bars and laps at intersections
Trench mesh and top mesh where drawn
Bar chairs at spacing that holds cover
Mesh level, with no sagging bays
Vapour barrier under the steel, lapped and taped
Waffle pods fixed down and spaced
Plumbing penetrations sleeved and sealed
Sewer and stormwater ends capped
Set-downs for wet areas and garage
Rubbish cleared from the beam trenches
Slab edge set-out against the plans
Termite collars at penetrations where specified

Why it matters here

Slab pre-pour inspections on Truganina builds

Truganina slabs are designed as stiffened rafts to ride the seasonal movement of the clay. That only works if the beams are the width and depth drawn, the steel is lapped at every junction and the vapour barrier sits where it should. On one recent Truganina slab the corner L bars at beam intersections had been left out entirely, a structural item that would have been invisible a day later.

What we find at this stage in Truganina

Corner L bars missing where beams meet
Loadbearing stems narrower than 150mm
Pods shifted so beams lose width
Mesh sagging with no bar chairs under it
Vapour barrier dragged over the steel
Pipe ends left open or damaged

Engineer detail for lapping reinforcement where beams intersect, Truganina — Engineer detail for lapping reinforcement where beams intersect

Vapour barrier pulled over the reinforcing steel instead of lying beneath it, Truganina — Vapour barrier pulled over the reinforcing steel instead of lying beneath it

Slab mesh cut through in one section and needing extra steel to bridge it, Truganina — Slab mesh cut through in one section and needing extra steel to bridge it

Sample findings

Sample defects found during our slab pre-pour inspections in Truganina

Annotated findings from Slab pre-pour inspections.

Corner L bars at beam intersections missing from where the drawings place them, found during a slab pre-pour inspection in Truganina — Corner L bars at beam intersections missing from where the drawings place them

Loadbearing stem narrower than the 150mm needed to pass load down to the footings, found during a slab pre-pour inspection in Truganina — Loadbearing stem narrower than the 150mm needed to pass load down to the footings

Waffle pods shifted so the beam is narrower than the engineer's minimum width, found during a slab pre-pour inspection in Truganina — Waffle pods shifted so the beam is narrower than the engineer's minimum width

Slab mesh sagging between supports, which would leave uneven concrete cover, found during a slab pre-pour inspection in Truganina — Slab mesh sagging between supports, which would leave uneven concrete cover

Reinforcement sitting without bar chairs, so it would end up too low in the concrete, found during a slab pre-pour inspection in Truganina — Reinforcement sitting without bar chairs, so it would end up too low in the concrete

The other stages of a Truganina build

All construction stage inspections in Truganina →

Guides

Construction stage guides for Truganina

4 September 2026 · 6 min read

When the frame does not match the engineering: Truganina frame findings

Beams at the wrong size, connections fixed another way and strongbacks without grips. Why frame stage on a Truganina build is a drawings exercise.

14 August 2026 · 5 min read

Set-downs, slab edges and the 10mm and 20mm limits on Truganina builds

Shower set-downs under the wall line, slab edges in the cavity and honeycombed concrete. What we measure when the frame first sits on the slab.

26 June 2026 · 5 min read

Frame items that are still open at lock-up, and how to stop that happening

Why the lock-up visit on a Truganina build rechecks the frame report, and what a cut top plate, slack bracing and missing tie-downs have in common.

All guides →

FAQ

Slab pre-pour inspections in Truganina: common questions

How much warning should I give for a Truganina slab visit?

A few working days is ideal. If the builder only gives a day's warning, call us anyway, as slab visits are often fitted in at short notice.

Which documents does a Truganina slab get compared with?

The engineer's slab design for your lot, AS 2870, AS 3600 and the NCC Housing Provisions, plus the soil report where it is supplied.

Can the pour proceed if the report lists defects?

You and the builder decide that between you. Most items, such as missing bar chairs or open pipes, can be fixed the same day. Structural items such as missing reinforcement should be corrected and confirmed before concrete.

Why does it matter where the vapour barrier sits?

It has to sit under the slab and up the edge beams to keep ground moisture out. Pulled over the steel, it separates the concrete from its reinforcement.

Is the under slab plumbing checked?

We look at penetrations, sleeves, capping and visible damage. We do not pressure test the drainage, which is the plumber's job.

Is this the same as the surveyor's slab inspection?

No. The surveyor or their delegate inspects for permit purposes. The visit we make is separate from that and answers only to you.