It proved a fairly labour intensive activity.
The first step was to remove the old concrete floor. It turns out that the original construction method was basically:
- Create a layer of sand
- Bring in rocks, presumably from off the farm somewhere, and set them up so that the tops were reasonably level
- Fill the gaps between the rocks with more sand, creating a relatively level surface
- Pour a layer of concrete on top and level off as best as they could
The following photograph is a progress shot in getting the surface ready for the blokes who we selected to lay the replacement concrete. Basically we re-used most of the rocks but buried them in the old sand. On the right side of the picture you can just see the level sand surface. As the new concrete was to be 100 mm thick we used several pieces of baling twine to act as the leveling guides together with a piece of timber that was 100 mm wide, dragging the latter across the surface to finish it off.