fee standing decking (i.e. not fixed to wall of house)
20 foot x 12 foot, blinking heavy it will be I'm using 9" x 1.5" joists and I can hardly pick each one up as they are currently 15 foot long I propose to use 15 posts each 4"x 4" with 5 foot centres the deck will be raised slightly approx 1 foot off the ground allowing space under the joists as the gound is not level So, question is, do I- sink the posts into concrete?
- dig down to hard stuff, chuck in a breeze block and free stand them on this (as per Tommy Ground Force) or, is there another way (3)? ta in advance