Suggested foundation types
The average weight of a 20 ft x 8 ft completed garden room is approximately 4 metric tonnes 4000 kgs. So a suitable foundation is essential to prevent sinkage and to increase the protection of the exposed steel sub-structure . Location and budget will no doubt dictate which option you go for but needless to say a good level foundation is very important.
Level compacted gravel
The bare minimum base for your container would be a compacted gravel base perhaps with some plastic reinforcing grids.
Timber sleepers
Timber sleepers, whether reclaimed or new, make for an easy option but will, after many years, need replacing.
Concrete sleepers
Obviously longer lasting than the wooden variety but much harder to handle.
Concrete piers
Simple concrete piers make an excellent choice you can purchase preformed tubes to fill with concrete or make the forms yourself from plywood. Concrete filled steel drums are also an excellent choice.
Solid reinforced concrete foundation
Obviously a very permanent option which offers excellent strength and durability. More costly than the previous options.
Solid reinforced concrete base
Again this provides a very permanent & solid foundation. Again a more expensive option.
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