Hi, i have an existing 100mm concrete slab which i want to cover with a 6m x 4m shade sail. One side will be attached to the house, and the other to posts. My question is, since the slab is already there, can i safely use 100x100 treated pine posts set in stirrups which i will dynabolt to the concrete. The slab was poured deeper (approx 400mm) around the perimeter to act as a footing.


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