Size of House is approx[b] 40 ft by 100 ft[/b] (compare the size of your house to mine). My house was a building of 4 flats (2 on the ground floor and 2 on the top floor) with 3 bedrooms each (all rooms ensuite) 12mm rods: 5 tons (assuming each ton comprises of 84 pieces). Some tonnes are however made up of 96 pieces of 12mm rods. Bottom line ...