19 July 2018 Alex Mitchell

Building a designer Newcastle granny flat: Pouring the slab

This blog is the third in the series of following the process of building a designer granny flat. You can find the first and second blogs below, if you want to catch up on the initial stages we discussed.

The next stage in bringing the plans for The Silverdale to life is a major milestone for the project, which is the preparation and pouring of the concrete slab (floor).

We started by erecting the formwork (form boards) which formed the footprint for the granny flat, marking out its perimeter.

After we installed the form boards, we installed the waffle pods (refer to photo below). Waffle pods are made from polystyrene and create pockets of air that form an insulating layer between the structure and the ground which helps to reduce energy consumption within the home.

Next it was time for the reinforcing steel. When you’re working with concrete in building and construction, reinforcing steel is essential. Also known as rebar, the combination of mesh and bars are used as a tension device to strengthen the concrete.

Before we could pour the concrete, it was a prerequisite to have the private certifier come out and inspect the form boards, waffle pods and reinforcing steel to confirm that all work has been completed as the engineers designed it. Once the formwork and steel was signed off it was time to pour.

This is one of the busiest stages in the process with the concrete pump first to arrive on site with the operators, then the first concrete truck arrives. Once the pump and truck are in position, the team were ready to start pumping concrete into the formwork. Onsite we had two concreters and two of our own labourers assisting in the pour.

The first pour of concrete went into all the edge beams and internal beams (spaces between the pods). It is then important to use a vibrator to make sure there are no voids or air pockets in the concrete. Once the concrete was poured into the beams, we poured the concrete across the top of the pods and began the process of levelling the surface of the slab. The concreters used a 3.6m screed and a laser level to set the correct heights and to make sure the whole surface was level. Once the surface is set, they begin the process of finishing it off, this is how they make the surface smooth for the next trades to work on.


concrete slab

Our next blog will outline how we progress from preparing and pouring the concrete slab, to framing the granny flat.

We are hosting the Grand Opening of this designer granny flat on Saturday 28th July from 10am – 3pm! You can RSVP on our Facebook event, or details are below!

1a Silverdale Parade, Jewells (entry via Gradburn Parade)
28th July 2018
10am – 3pm
We will have a BBQ, so bring the whole family!

If you would like to start planning your designer granny flat, fill in the form below and one of our team will give you a call!

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