BlueBoard Fence Between 2 Brick Pillars

[niczoom]

Hello,

I want to install a fence like structure between 2 brick pillars that will hold blueboard ready for rendering.

The distance between the 2 pillars is 4.7m, I was intending to put 2 50x50 steel posts in to divide the distance into thirds (1550mm ea approx) then create a fence/stud like structure to support the blueboard across this span using the specs supplied by James Hardie website.

I'm not sure on my fence/stud building method using a mix of fencing rails, p/pine and/or rondo batons.

Is 350x350x400 enough of a footing for the pillars? They will be 350x350x1.8m, the soil is a tough clay type as you dig down not far from the surface.

Thanks,
Nic.

[Claw Hama]

Not sure about your footings but I wouldn't use Blue Board you will continually get cracking. Go with Green Board, it's much more stable.