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What a day.... 36 bags of premixed concrete and 4 bags cement later, the pier is poured. 250mm square, 1.5m high, for an above floor height of around 1.1m in the finished obs.
One near catastrophe - one of the pine boards used for formwork cracked through a knot under the pressure once the pier was filled.... all is holding up though - I was worried for a minute or sixty though! - next time I'll use 20-25mm ply instead I think.....
Pier plate was made from 10mm mild steel, cut by a local firm to a square with round corners, drilled out to 1/2" for 12mm stainless threaded rod set in the pier.
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