Stage 2 – Measuring and excavating the column pits in the foundation trench
In Stage 2 we measure the distance between the pits to be excavated for placing the columns (Photo 15), which, ideally, should not exceed two meters. Given the diameter of the columns (13 cm each), the spacing between each column pit should be 1.87 m (Photo 16). Thus, 16 column pits are excavated on each side of the greenhouse (Photo 17), totaling 32 column pits for a 30-meter long greenhouse. Depth to be excavated is 60 cm for each pit (increase depth if soil is too humid), with a diameter of 20 cm (Photo 18). Excavation of all the column pits can be seen in Photos 19 and 20.
Materials required for execution of Stage 2: folding ruler or measure tape, post hole digger