We are about to move into (hopefully) our last house. The garden isn't huge but big enough for a modest 3.5 x 4m workshop. In an ideal world I would like to put in a full concrete base as recommended by Mike G in his advisory post but access for ready mix or mix my own concrete makes that a bit of an issue when tied in with my recurring back problems (fell off a roof 30 years ago, still paying the price)
I'd thought about setting a grid of suitably treated 100mm posts into postcrete and building a floor frame off of that but I'm concerned about a) longevity of that sort of 'footing', b) the weight loading and c)insulating the floor. What I don't want to do is be lifting the shed off in a few years because its sinking
If I came off the posts with 175mm joists bolted into the posts at 400mm centres leaving a 50mm gap between joist and ground level would I need to close the bottom of the frame off or could I just lay in some 100mm insulation and cover it with osb?
The ground was part of a field originally so I guess I might need to go down a couple of feet?