I am about to construct my base this weekend and would like some opinions to save me about AU$120.

The base of my oven is 1400 x 1300mm. The inside measurements (inside the brickwork) is 1200x1100mm

Spanning across the void (1100mm) are four 30x30x5mm lengths of angle iron and in the middle is a brick pier. There are another 2 courses of bricks around the base giving a depth for insulation of 160mm.

I had originally thought I would need a piece of compressed fibre cement sheeting (1200x1100x15mm) to use as the base for pouring the insulation mix on. But now with 160mm of insulation mix over the top I'm wondering if I should just reinforce the insulation mix and put a piece of ply formwork underneath.

I'm unsure of the strength properties of the insulation mix and would like some informed opinions of this.

The insulation mix will be vermiculite and portland cement.

Rod

The base of my oven is 1400 x 1300mm. The inside measurements (inside the brickwork) is 1200x1100mm

Spanning across the void (1100mm) are four 30x30x5mm lengths of angle iron and in the middle is a brick pier. There are another 2 courses of bricks around the base giving a depth for insulation of 160mm.

I had originally thought I would need a piece of compressed fibre cement sheeting (1200x1100x15mm) to use as the base for pouring the insulation mix on. But now with 160mm of insulation mix over the top I'm wondering if I should just reinforce the insulation mix and put a piece of ply formwork underneath.

I'm unsure of the strength properties of the insulation mix and would like some informed opinions of this.

The insulation mix will be vermiculite and portland cement.

Rod

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