Foundations: The Bit Everything Else Stands On
There's a particular moment on a foundations day that I love. It's when the concrete trucks are gone, the placers have spent hours getting the surface knife-edge sharp, and the slab is just sitting there in the afternoon light. Nobody's walking on it yet. It's the quietest a building site ever gets — and underneath that calm is days of careful work that nobody from the road will ever see.
That's what foundations are: the bit everything else stands on.
What actually happens at foundations stage
In plain English, foundations are the structural base of the home — the part that anchors everything above it to the ground. On a site like Meeanee Road, that means:
Stripping topsoil and digging down to good ground
Filling and compacting in layers with hardfill (AP40 — crushed rock)
Setting out the building with profiles and stringlines
Boxing up the perimeter with formwork
Running plumbing through before the concrete locks it all in
Laying sand blinding, polythene, the cupolex pod floor system and the steel reinforcing
Pouring and finishing the slab
It's a lot of small, careful steps. Get any of them wrong and you're paying for it for the next fifty years.
How it played out on Meeanee Road
We engaged Dave at Napier Earthworks and Concrete for the dig. Quote came back fast, easy to deal with, and on top of that he kept his operation neat and tidy around the 9am and 3pm school rushes which on this street is no small thing. There are a lot of kids around at those times, and watching out for them is part of the job.
Based on the geotech we had to dig down 500mm below ground level and refill with AP40, compacting in layers to get the right density. The team from Below Ground came back to test it. They run a sand-and-vibration test pour a measured amount of sand into a known volume and vibrate it, then the amount that disappears into the hardfill tells you how well compacted it is. Genuinely fascinating to watch.
Once the dig was done, the most important job on a foundation begins: stringlines. Getting them square, parallel, and exactly to the dimensions on the plan is slow, focused work. Rush it and the rest of the build pays for it. We had a classic teaching moment here, our apprentice held the tape on the 100mm mark instead of 1000mm (we offset because the hook on the end of a tape is hard to land exactly on a point), and one string ended up 900mm out. A short headscratch and a tape check sorted it. By the end we had the whole building square and parallel within a millimetre, which makes every stage above it easier.
From there: formply and 4x2 shutters boxed up to 300mm. Josiah and the team at Reset Plumbing came in next. Within a day they were inspection-ready, passed first go, backfilled and, beautiful detail, compacted their own backfill before they left. That's the kind of pride in work we love seeing on our sites.
Then 20mm of sand blinding (to stop sharp stones piercing the polythene), polythene down, cupolex pods laid out as per the engineer's plan (like a Lego set for adults), HD12 reinforcing bars and mesh on top. Engineer inspection: passed. Council inspection: passed. Greenlight to pour.
Access on this site is tight, so we had to organise with the neighbours to park the concrete pump and trucks in their driveway. We owe them a wine and some biltong. The pour itself took about three hours; the placers spent the rest of the day working the surface until it was sharp. Over the weekend our client came down and stripped the formwork himself keen as.
The BB Build way
Foundations are deeply satisfying to do, and they're also where careful builders separate themselves from average ones. The square-within-a-millimetre, the apprentice being shown why we measure the way we measure, the plumber compacting his own backfill, the placers staying late to get the surface right, those aren't extras. That's just how a foundation should be done. Done right, it makes every stage above it easier.
What's next
The slab is down and cured. Timber's been ordered. Next up: framing. Things are going to start changing fast, scan the QR again on your next walk past and you'll see this place stop being a slab and start being a home.
