Preparing the ground for the garage and playpen
A tin garage as an alternative to a masonry garage, however, requires the ground to be prepared for its installation. Below you will find the most common types of subfloor to which a garage can be anchored:
(NOTE! Please note that the prepared substrate must be sufficiently stable, even and must create conditions for safe installation).
The following are the most common methods of anchoring a tin garage:

Foundation
Draw the outline lines of the garage on the ground.
The next step is to dig a trench 20 cm wide and 30 cm deep along the contour lines of the garage. The foundation should extend 10 cm on each side from the contour line. Finally, the trench should be poured with concrete. Depending on the weather, the waiting period for the concrete to set is 3 days.

Concrete screed
Concrete screed is a very quick – and also very effective solution.
Place the boards to the size of your garage outline so that it is 10 cm larger on each side. Block the boards from the outside so that the force of the poured concrete does not destroy the structure! Pour the concrete into the finished formwork for the garage.
Then wait 3 days (a lot depends on the weather) and when the concrete has set, pull the boards away from the formwork.

Paving stones
This is a recommended solution for garages that need to maintain a higher temperature. The substrate must be leveled and rebalanced before paving.

Concrete blocks
Lay the concrete blocks along the contour line of the garage. Minimum 4 blocks in each corner! The larger the garage structure the more blocks there should be.
Please ensure that all blocks are leveled. Fill the center of the garage with loose material such as rubble or gravel.