I am planning to build some decking at the end of the garden.
I planned area is approx 6m wide x 3m deep.
How many concreate set wooden posts would be required to support the whole structure up?
And at what distance should I set each post. Because the decking area is 6m wide and 3m deep should I set some supporting posts in the central area?
I only plan to raise the decking by approx 100mm from level ground.